Click here for production status of specific part numbers.
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
General Description
The MAX20335 is a battery-charge-management solution
ideal for low-power wearable applications. The device
includes a linear battery charger with a smart power
selector and several power-optimized peripherals. The
MAX20335 features two ultra-low quiescent current buck
regulators and three ultra-low quiescent current low-dropout
(LDO) linear regulators, providing up to five regulated
voltages, each with an ultra-low quiescent current, allows
designers to minimize power consumption and extend
battery life in 24/7 operation devices, such as those in the
wearable market.
The battery charger features a smart power selector that
allows operation on a dead battery when connected to a
power source. To avoid overloading a power adapter, the
input current to the smart power selector is limited based
on an I2C register setting. If the charger power source
is unable to supply the entire system load, the smart
power control circuit supplements the system load with
current from the battery. The charger also supports
temperature dependent charge currents.
The two synchronous, high-efficiency step-down buck
regulators feature a variable frequency mode for increased
efficiency during light-load operation. The output voltage
of these regulators can be programmed through I2C
with the default preconfigured. The buck regulators can
support dynamic voltage scaling to further improve
system power consumption.
The three configurable LDOs each have a dedicated
input pin. Each LDO regulator output voltage can be
programmed through I2C with the default preconfigured.
The linear regulators can also be configured to operate
as power switches that may be used to disconnect the
quiescent load of the system peripherals.
The MAX20335 features a programmable power controller
that allows the device to be configured for applications
that require the device be in a true-off, or always-on,
state. The controller also provides a delayed reset signal
and voltage sequencing.
The MAX20335 is available in a 36-bump, 0.4mm pitch,
2.72mm x 2.47mm wafer-level package (WLP).
19-100288; Rev 6 6/21
Benefits and Features
● Extend System Use Time Between Battery Charging
• Dual Ultra-Low-IQ 200mA Buck Regulators
• Output Programmable from 0.7V to 2.275V and
0.7V to 3.85V
• 0.9μA (typ) Quiescent Current (Buck 1)
• Optional Fixed Peak-Current Mode to Optimize
Ripple Frequency in Noise-Sensitive Applications
• Three Ultra-Low-IQ 100mA LDOs
• LDO1
• Output Programmable from 0.8V to 3.6V
• 0.6μA (typ) Quiescent Current
• 2.7V to 5.5V Input with Dedicated Pin
• LDO2/3
• Output Programmable from 0.9V to 4V
• 1μA (typ) Quiescent Current
• 1.71V to 5.5V Input with Dedicated Pin
● Easy-to-Implement Li+ Battery Charging
• Smart Power Selector
• 28V/-5.5V Tolerant Input
• Thermistor Monitor
● Minimize Solution Footprint Through High Integration
• Provides Five Regulated Voltage Rails
• Switch Mode Option on Each LDO
● Optimize System Control
• Monitors Pushbutton for Ultra-Low Power Mode
• Power-On Reset Delay and Voltage Sequencing
• On-Chip Voltage Monitor Multiplexer
Applications
● Wearable Electronics
● Fitness Monitors
● Rechargeable IoT devices
Ordering Information appears at end of data sheet.
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
TABLE OF CONTENTS
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Benefits and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Typical Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Bump Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Bump Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Power Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Power On/Off and Reset Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Power Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Smart Power Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Thermal Current Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
System Load Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Input Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Fast-Charge Current Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Thermistor Monitoring with Charger Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
I2C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
I2C Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Thermistor Monitoring with Charger Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
I2C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Start, Stop, And Repeated Start Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Slave Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Bit Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Single-Byte Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Burst Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Single Byte Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Burst Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Acknowledge Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
I2C Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
I2C Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
www.maximintegrated.com
Maxim Integrated │ 2
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
TABLE OF CONTENTS (continued)
Applications Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Inductor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Output Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Input Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
PCB Layout and Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Chip Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
LIST OF FIGURES
Figure 1. Power Function Input Control Modes Flow Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 2a. Power-On Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 2b. Power-On Sequencing Without Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 3. Smart Power Selector Current/Voltage Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 4a. Charging Behavior Using Thermistor Monitoring Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 4b. Charging Behavior Using JEITA Monitoring 1 and 2 Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 5a. Charger State Diagram (Thermistor Monitoring with Charger Shutdown) . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 5b. Battery Charger State Diagram (JEITA Monitoring with Charger Shutdown) . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 6. I2C START, STOP and REPEATED START Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 7. Write Byte Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 8. Burst Write Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 9. Read Byte Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 10. Burst Read Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 11. Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
LIST OF TABLES
Table 1. Power Function Input Control Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 2. Thermistor Monitoring/JEITA Monitoring Enable Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 3. I2C Slave Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 4. ChipId Register (0x00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 5. ChipRev Register (0x01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 6. StatusA Register (0x02) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 7. StatusB Register (0x03) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
www.maximintegrated.com
Maxim Integrated │ 3
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
LIST OF TABLES (continued)
Table 8. StatusC Register (0x04) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Table 9. IntA Register (0x05) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Table 10. IntB Register (0x06) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Table 11. IntMaskA Register (0x07) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 12. IntMaskB Register (0x08) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 13. ILimCntl Register (0x09) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 14. ChgCntlA Register (0x0A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 15. ChgCntlB Register (0x0B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 16. ChTmr Register (0x0C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 17. Buck1Cfg Register (0x0D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Table 18. Buck1VSet Register (0x0E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 19. Buck2Cfg Register (0x0F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 20. Buck2VSet Register (0x10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 21. Buck1/2ISet Register (0x11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 22. LDO1Cfg Register (0x12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 23. LDO1VSet Register (0x13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 24. LDO2Cfg Register (0x14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 25. LDO2VSet Register (0x15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 26. LDO3Cfg Register (0x16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 27. LDO3VSet Register (0x17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 28. ThrmCfg Register (0x18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Table 29. ThrmCfg Register (0x19) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Table 30. MONCfg Register (0x1A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Table 31. BootCfg Register (0x1B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Table 32. PinStat Register (0x1C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Table 33. Buck1/2Extra Control Register (0x1D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Table 34. PwrCfg Register (0x1E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Table 35. PwrCmd Register (0x1F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Table 36. Suggested Inductors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Table 37. Output Capacitor Values* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Table 38. Register Bit Default Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Table 39. Register Default Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
www.maximintegrated.com
Maxim Integrated │ 4
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Typical Application Circuit
MAX20335
SET
CHGIN
1µF
GND
CAP
Li+ BATTERY
CHARGER WITH
SMART POWER
SELECTOR
THM
BAT
1µF
1µF
EXT
VIO
SYS
VSYS 10µF
(*)
SCL
SCL
SDA
BUCK 1
INT
INT
MPC0
MPC0
MPC1
MPC1
CONTROL
BUCK 2
PFN2
PFN2
RST
RST
LDO/
SWITCH 1
PFN1
VSYS
B1LX
B2LX
L1IN
MON
MUX/
DIVIDER
LDO/
SWITCH 3
VB2
2.2µH
VL1
L3OUT
1µF
VSYS
VL2
L2OUT
L3IN
10µF
VSYS
L1OUT
L2IN
10µF
2.2µH
B2OUT
LED
LDO/
SWITCH 2
MON
VB1
B1OUT
SDA
1µF
VSYS
VL3
1µF
* OPTIONAL EXTERNAL FET
www.maximintegrated.com
Maxim Integrated │ 5
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Absolute Maximum Ratings
(Voltages referenced to GND.)
SDA, SCL, THM, RST, SYS, PFN1, PFN2,
MPC0, MPC1, INT, MON, BAT, LED,
L1IN, L2IN, L3IN............................................... -0.3V to +6.0V
B1LX, B2LX, B1OUT, B2OUT, EXT....... -0.3V to (VSYS + 0.3V)
L1OUT.................................................... -0.3V to (VL1IN + 0.3V)
L2OUT.................................................... -0.3V to (VL2IN + 0.3V)
L3OUT.................................................... -0.3V to (VL3IN + 0.3V)
CHGIN ..................................................................... -6V to +30V
CAP.................................... -0.3V to min (|VCHGIN| + 0.3V, +6V)
SET .......................................................... -0.3V to VBAT + 0.3V
Continuous Current into CHGIN, BAT, SYS .................±1000mA
Continuous Current into any other terminal ...................±100mA
Continuous Power Dissipation (multilayer board at +70°C):
6 x 6 Array 36-Bump 2.72mm x 2.47mm
0.4mm Pitch WLP (derate 21.70mW/°C)........................1.74W
Operating Temperature Range............................ -40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Soldering Temperature (reflow)........................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any
other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device
reliability.
Package Information
PACKAGE TYPE: 36 WLP
Package Code
W362D2+1
Outline Number
21-0897
Land Pattern Number
Refer to Application Note 1891
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θJA)
46°C/W
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
www.maximintegrated.com
Maxim Integrated │ 6
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
GLOBAL SUPPLY CURRENT (L_IN Connected to SYS)
All functions disabled
Charger Input Current
BAT Input Current
ICHG
IBAT
0.26
Power on, VCHGIN = 5V
SYS switch closed, buck regulators
enabled, LDO1 enabled, ISYS = 0A,
IB_OUT = 0A, IL_OUT = 0A
1.5
Power off, VCHGIN = 0V,
SYS switch open
0.96
1.7
Power on, VCHGIN = 0V
SYS switch closed, 2x buck
regulators enabled, LDOs disabled.
ISYS = 0A, IB_OUT = 0A
2.8
4.3
Power on, VCHGIN = 0V SYS switch
closed, 2x buck regulators enabled,
LDO1 enabled, ISYS = 0A, IB_OUT =
0A, IL_OUT = 0A
3.5
7
Power on, VCHGIN = 0V
SYS switch closed, 2x buck
regulators enabled, 3x LDOs
enabled, ISYS = 0A, IB_OUT = 0A,
IL_OUT = 0A
5.2
mA
µA
BUCK REGULATOR 1
(VSYS = +3.7V, L = 2.2µH, C = 2.2µF, VB1OUT = 1.2V)
Input Voltage
VIN_BUCK1
Input voltage = VSYS
2.7
5.5
V
Output Voltage
VOUT_BUCK1
25mV step resolution
0.7
2.275
V
Output UVLO Voltage
VUVLO_BUCK1
Note: For VOUT < UVLO ZC is
imposed. Falling edge (75mV typ
hysteresis)
0.35
0.55
V
1.3
µA
Quiescent Supply
Current
IQ_BUCK1
Buck enabled, IB1OUT = 0mA,
VSYS = 3.7V, VB1OUT = 1.2V
(Note 2)
0.9
Dropout Quiescent
Supply Current
IQDO_BUCK1
IB1OUT = 0mA, (VSYS – VOUT)
≤ 0.1V
1.1
mA
Shutdown Supply
Current with Active
Discharge Enabled
ISD_BUCK1
Buck1 disabled. Falling edge (75mV typ
hysterisis)
60
µA
Output Accuracy
ACCBUCK1
IB1OUT = 1mA
Peak-to-Peak Ripple
VPPRIPPLE1
Buck1ISet = 100mA, COUT = 2.2µF,
IB1OUT = 1mA
IPEAK Set Range
IPEAK_BUCK1
25mA step resolution set by
Buck1ISet[3:0].
www.maximintegrated.com
-2.5
+2.5
10
50
%
mV
375
mA
Maxim Integrated │ 7
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Load Regulation Error
VLOADR_BUCK1
Buck1ISet = 150mA,
Buck1IAdptEnb = 0,
IB1OUT = 300mA
-3
%
Line Regulation Error
VLINER_BUCK1
VB1OUT = 1.2V; VSYS from 2.7V
to 5.5V
3
mV
Maximum Operating
Output Current
IOUT_BUCK1
VSYS = 3.7V, Buck1VSet = 1.2V,
Buck1ISet = 200mA, Buck1IAdptEnb
= 0, load regulation error = -5%
500
mA
B1OUT Pulldown
Current
ILEAK_B1OUT
Buck1 enabled
110
nA
B1OUT Pulldown
Resistance
RPD_B1OUT
Buck1 disabled, VB1OUT = 1.2V
12
MΩ
pMOS On-Resistance
nMOS On-Resistance
RONP_BUCK1
RONN_BUCK1
Freewheeling
On-Resistance
RONFW_BUCK1
Minimum TON
TON_MIN
Maximum Duty Cycle
DMAX_BUCK1
Switching Frequency
fSW_BUCK1
Average Current During
Short-Circuit to GND
ISHRT_BUCK1
200
Buck1FFET = 0
0.27
0.5
Ω
Buck1FFET = 1
Buck1FFET = 0
0.55
1
Ω
0.24
0.45
Ω
Buck1FFET = 1
0.43
0.9
Ω
VSYS = 3.7V, VB1OUT = 1.2V
7.3
13
Ω
40
80
ns
Buck1IAdptEnb = 0
98
%
Load regulation error = -3%
3
MHz
100
mA
Buck1ISet = 150mA,
Buck1IAdptEnb = 0, VB1OUT = 0V
BLX Leakage Current
IBLX_BUCK1
Active Discharge Current
IPD_BUCK1
VB1OUT = 1.2V
17
mA
Passive Discharge
Resistance
RPD_BUCK1
VB1OUT = 1.2V
9
kΩ
Full Turn-On Time
tON_BUCK1
Time from enable to full current
capability, Buck1Fst = 0
58
ms
ILOAD = 10mA, Buck1ISet = 150mA,
Inductor = BOURNS SRP20102R2M, VB1OUT = 1.2V
87
%
Buck1LowEMI = 0
2
Buck1LowEMI = 1
0.5
Efficiency
EffBUCK1
0.005
1
µA
BLX Rising/Falling Slew
Rate
SRBLX_BUCK1
Thermal-Shutdown
Temperature
TSHDN_BUCK1
140
°C
TSHDN_HYST_BUCK1
10
°C
Thermal-Shutdown
Temperature Hysteresis
www.maximintegrated.com
V/ns
Maxim Integrated │ 8
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
BUCK REGULATOR 2
(VSYS = +3.7V, L = 2.2µH, C = 2.2µF, VB2OUT = 1.2V)
Input Voltage
VIN_BUCK2
Input voltage = VSYS
2.7
5.5
V
Output Voltage
VOUT_BUCK2
50mV step resolution
0.7
3.85
V
Output UVLO Voltage
VUVLO_BUCK2
Note: For VOUT < UVLO ZC is
imposed. Falling edge (75mV typ
hysteresis)
0.35
0.55
V
1
1.4
µA
Quiescent Supply
Current
IQ_BUCK2
Dropout Quiescent
Supply Current
IQDO_BUCK2
Shutdown Supply
Current with Active
Discharge Enabled
Output Accuracy
Buck enabled, IB2OUT = 0mA,
VSYS = 3.7V, VB2OUT = 1.2V
(Note 2)
IB2OUT = 0mA, VSYS – VB2OUT
≤ 0.1V
1.1
mA
ISD_BUCK2
Buck1 disabled, Buck2ActDSC = 1.
60
µA
ACCBUCK2
IB2OUT = 1mA, VB2OUT < 3.4V
Peak-to-Peak Ripple
VPPRIPPLE2
Buck2ISet = 100mA, COUT = 2.2µF,
IB2OUT = 1mA
IPEAK Set Range
IPEAK_BUCK2
25mA step resolution set by
Buck2ISet[3:0].
-2.5
+2.5
10
50
%
mV
375
mA
Load Regulation Error
VLOADR_BUCK2
Buck2ISet = 150mA,
Buck2IAdptEnb = 0, IB2OUT =
300mA
-3
%
Line Regulation Error
VLINER_BUCK2
VB2OUT = 1.2V; VSYS from 2.7V
to 5.5V
3
mV
Maximum Operating
Output Current
IOUT_BUCK2
VSYS = 3.7V, Buck2VSet = 1.2V,
Buck2ISet = 200mA, Buck2IAdptEnb
= 0, load regulation = -5%
500
mA
B2OUT Pulldown
Current
ILEAK_B2OUT
Buck2 enabled
220
nA
B2OUT Pulldown
Resistance
RPD_B2OUT
Buck2 disabled, VB2OUT = 1.2V
6
MΩ
pMOS On-Resistance
RONP_BUCK2
nMOS On-Resistance
RONN_BUCK2
Freewheeling
On-Resistance
www.maximintegrated.com
RONFW_BUCK2
200
Buck2FFET = 0
0.27
0.5
Ω
Buck2FFET = 1
0.55
1
Ω
Buck2FFET = 0
0.24
0.45
Ω
Buck2FFET = 1
0.43
0.9
Ω
VSYS = 3.7V, VB2OUT = 1.2V
7.3
13
Ω
Maxim Integrated │ 9
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
Minimum TON
SYMBOL
Maximum Duty Cycle
DMAX_BUCK2
Switching Frequency
fSW_BUCK2
Average Current During
Short-Circuit to GND
CONDITIONS
MIN
TON_MIN
ISHRT_BUCK2
TYP
MAX
UNITS
40
80
ns
Buck2IAdptEnb = 0
98
%
Load regulation error = -3%
3
MHz
100
mA
Buck2ISet = 150mA,
Buck2IAdptEnb = 0, VB2OUT = 0V
BLX Leakage Current
IBLX_BUCK2
Active Discharge Current
IPD_BUCK2
VB2OUT = 1.2V
17
mA
Passive Discharge
Resistance
RPD_BUCK2
VB2OUT = 1.2V
9
kΩ
Full Turn-On Time
TON_BUCK2
Time from enable to full current
capability, Buck2Fst = 0
58
ms
ILOAD = 10mA, Buck2ISet = 150mA,
Inductor = BOURNS SRP20102R2M, VB2OUT = 1.2V
87
%
Buck2LowEMI = 0
2
Buck2LowEMI = 1
0.5
Efficiency
EffBUCK2
0.005
1
µA
BLX Rising/Falling Slew
Rate
SRBLX_BUCK2
Thermal-Shutdown
Temperature
TSHDN_BUCK2
140
°C
TSHDN_HYST_BUCK2
10
°C
Thermal-Shutdown
Temperature Hysteresis
V/ns
LDO1
(C = 1μF, unless otherwise noted. Typical values are at VL1IN = 3.7V, with IL1OUT = 10mA, VL1OUT = 3V.)
Input Voltage
VINLDO1
Quiescent Supply
Current
IQ_LDO1
Shutdown Supply
Current with Active
Discharge Enabled
ISD_LDO1
Maximum Output
Current
Output Voltage
Output Accuracy
www.maximintegrated.com
LDO mode
2.7
Switch mode
1.2
LDO enabled, IL1OUT = 0µA
0.55
LDO enabled, IL1OUT = 0µA,
Switch mode
0.45
LDO1 disabled. LDO1ActDSC=1.
5.5
V
5.5
V
4
µA
55
µA
IL1OUT_MAX
100
VL1OUT
0.8
3.6
V
-2.7
+2.7
%
ACCLDO1
VL1IN = (VL1OUT + 0.5V) or higher,
IL1OUT = 100µA
mA
Maxim Integrated │ 10
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
Dropout Voltage
SYMBOL
VDROP_LDO1
CONDITIONS
Line Regulation Error
VLINEREG_LDO1
VL1IN = (VL1OUT + 0.5V) to 5.5V
Load Regulation Error
VLOADREG_LDO1
IL1OUT = 100µA to 100mA
Line Transient
VLINETRAN_LDO1
Load Transient
VLOADTRAN_LDO1
Passive Discharge
Resistance
RPD_LDO1
Active Discharge Current
IADL_LDO1
Switch Mode Resistance
Turn-On Time
RON_LDO1
tON_LDO1
MIN
TYP
VL1IN = 3V, IL1OUT_ = 100mA,
LDO1VSet = 3V
-0.12
MAX
UNITS
102
mV
0.022
+0.12
%/V
0.002
0.005
%/mA
VL1IN = 4V to 5V, 200ns rise time
±36
mV
VL1IN = 4V to 5V, 1µs rise time
±28
mV
IL1OUT = 0mA to 10mA, 200ns
rise time
145
mV
IL1OUT = 0mA to 100mA, 200ns
rise time
290
mV
5
10
16
KΩ
7
20
37
mA
VL1IN = 2.7V, IL1OUT = 100mA
0.5
0.85
VL1IN = 1.8V, IL1OUT = 100mA
0.76
1.3
VL1IN = 1.2V, IL1OUT = 5mA
1.7
2.8
IL1OUT = 0mA, time from 10% to
90% of final value
1.6
3.7
IL1OUT = 0mA, time from 10% to
90% of final value, Switch mode
0.25
0.65
VL1IN = 3.7V
Ω
ms
VL1IN = 2.7V, VL1OUT = GND
150
345
550
mA
VL1IN = 2.7V , VL1OUT = GND,
Switch mode
150
335
550
mA
Short-Circuit Current
Limit
ISHRT_LDO1
Thermal-Shutdown
Temperature
TSHDN_LDO1
150
°C
TSHDN_HYST_LDO1
16
°C
Thermal-Shutdown
Temperature Hysteresis
Output Noise
www.maximintegrated.com
OUTNOISE
10Hz to 100kHz, VL1IN = 5V,
VL1OUT = 3.3V
110
10Hz to 100kHz, VL1IN = 5V,
VL1OUT = 2.5V
95
10Hz to 100kHz, VL1IN = 5V,
VL1OUT = 1.2V
60
10Hz to 100kHz, VL1IN = 5V,
VL1OUT = 0.8V
60
µVrms
Maxim Integrated │ 11
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LDO2
(C = 1μF, unless otherwise noted. Typical values are at VL2IN = 3.7V, with IL2OUT = 10mA, VL2OUT = 3V.)
Input Voltage
VINLDO2
Quiescent Supply
Current
IQ_LDO2
Quiescent Supply
Current in Dropout
IQDO_LDO2
Shutdown Supply
Current with Active
Discharge Enabled
ISD_LDO2
Maximum Output
Current
Output Voltage
IL2OUT_MAX
LDO mode
1.71
5.5
V
Switch mode
1.2
5.5
V
IL2OUT = 0µA
ACCLDO2
Dropout Voltage
VDROP_LDO2
IL2OUT = 0µA, VL2IN = 2.9V,
LDO2VSet = 3V.
1.8
µA
LDO2 disabled. LDO2ActDSC=1.
54
µA
VL2IN ≥ 2.7V
100
mA
VL2IN = 1.8V or lower
50
mA
VL2IN = (VL2OUT + 0.5V) or higher,
IL2OUT = 100µA
VL2IN = (VL2OUT + 0.5V) to 5.5V
Load Regulation Error
VLOADREG_LDO2
IL2OUT = 100µA to 100mA
Load Transient
VLOADTRAN_LDO2
Passive Discharge
Resistance
RPD_LDO2
Active Discharge Current
IADL_LDO2
Switch Mode
Resistance
Turn-On Time
www.maximintegrated.com
RON_LDO2
tON_LDO2
0.9
4
V
-2.7
+2.7
%
100
mV
+0.05
+0.4
%/V
0.001
0.005
%/mA
VL2IN = 3V, IL2OUT_ = 100mA,
LDO2VSet = 3V
VLINEREG_LDO2
VLINETRAN_LDO2
µA
0.5
Line Regulation Error
Line Transient
5.1
IL2OUT = 0µA, Switch mode
VL2OUT
Output Accuracy
1
-0.4
VL2IN = 4V to 5V, 200ns rise time
±35
mV
VL2IN = 4V to 5V, 1µs rise time
±25
mV
IL2OUT = 0mA to 10mA, 200ns
rise time
100
mV
IL2OUT = 0mA to 100mA, 200ns
rise time
200
mV
5
10
16
KΩ
7
20
37
mA
VL2IN = 2.7V, IL2OUT = 100mA
0.46
0.76
VL2IN = 1.8V, IL2OUT = 50mA
0.7
1.15
VL2IN = 1.2V, IL2OUT = 5mA
1.7
2.6
IL2OUT = 0mA, time from 10% to
90% of final value
1.5
3.7
IL2OUT = 0mA, time from 10% to
90% of final value, Switch mode
0.25
0.65
VL2IN = 3.7V
Ω
ms
Maxim Integrated │ 12
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
VL2IN = 2.7V, VL2OUT = GND
CONDITIONS
140
340
600
mA
VL2IN = 2.7V , VL2OUT = GND,
Switch mode
140
330
600
mA
Short-Circuit Current
Limit
ISHRT_LDO2
Thermal-Shutdown
Temperature
TSHDN_LDO2
150
°C
TSHDN_HYST_LDO2
21
°C
Thermal-Shutdown
Temperature Hysteresis
Output Noise
L2IN UVLO
OUTNOISE
VUVLO_LDO2
10Hz to 100kHz, VL2IN = 5V,
VL2OUT = 3.3V
150
10Hz to 100kHz, VL2IN = 5V,
VL2OUT = 2.5V
125
10Hz to 100kHz, VL2IN = 5V,
VL2OUT = 1.2V
90
10Hz to 100kHz, VL2IN = 5V,
VL2OUT = 0.9V
80
VL2IN Falling
µVrms
1.14
VL2IN Rising
1.38
1.4
1.64
V
LDO3
(C = 1μF, unless otherwise noted. Typical values are at VL3IN = 3.7V, with IL3OUT = 10mA, VL3OUT = 3V.)
Input Voltage
VINLDO3
Quiescent Supply
Current
IQ_LDO3
Quiescent Supply
Current in Dropout
IQDO_LDO3
Shutdown Supply
Current with Active
Discharge Enabled
ISD_LDO3
Maximum Output
Current
Output Voltage
IL3OUT_MAX
1.71
5.5
V
Switch mode
1.2
5.5
V
IL3OUT = 0µA
ACCLDO3
Dropout Voltage
VDROP_LDO3
1
5.1
µA
IL3OUT = 0µA, Switch mode
0.5
IL3OUT = 0µA, VL3IN = 2.9V,
LDO3VSet = 3V.
1.8
µA
LDO3 disabled. LDO3ActDSC=1.
54
µA
VL3IN ≥ 2.7V
100
mA
VL3IN = 1.8V or lower
50
mA
VL3OUT
Output Accuracy
www.maximintegrated.com
LDO mode
VL3IN = (VL3OUT + 0.5V) or higher,
IL3OUT = 100µA
VL3IN = 3V, IL3OUT_ = 100mA,
LDO3VSet = 3V
0.9
4
V
-2.7
+2.7
%
100
mV
Maxim Integrated │ 13
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Line Regulation Error
VLINEREG_LDO3
VL3IN = (VL3OUT + 0.5V) to 5.5V
Load Regulation Error
VLOADREG_LDO3
IL3OUT = 100µA to 100mA
Line Transient
Load Transient
VLINETRAN_LDO3
VLOADTRAN_LDO3
Passive Discharge
Resistance
RPD_LDO3
Active Discharge Current
IADL_LDO3
Switch Mode Resistance
RON_LDO3
Turn-On Time
tON_LDO3
MIN
TYP
MAX
UNITS
-0.4
+0.05
+0.4
%/V
0.001
0.005
%/mA
VL3IN = 4V to 5V, 200ns rise time
±35
mV
VL3IN = 4V to 5V, 1µs rise time
±25
mV
IL3OUT = 0mA to 10mA, 200ns
rise time
100
mV
IL3OUT = 0mA to 100mA, 200ns
rise time
200
mV
5
10
16
KΩ
7
20
37
mA
VL3IN = 2.7V, IL3OUT = 100mA
0.46
0.76
VL3IN = 1.8V, IL3OUT = 100mA
0.7
1.15
VL3IN = 1.2V, IL3OUT = 5mA
1.7
2.6
IL3OUT = 0mA, time from 10% to
90% of final value
1.5
3.7
IL3OUT = 0mA, time from 10% to
90% of final value, Switch mode
0.25
0.65
VL3IN = 3.7V
Ω
ms
VL3IN = 2.7V, VL3OUT = GND
140
340
600
mA
VL3IN = 2.7V , VL3OUT = GND,
Switch mode
140
330
600
mA
Short-Circuit Current
Limit
ISHRT_LDO3
Thermal-Shutdown
Temperature
TSHDN_LDO3
150
°C
TSHDN_HYST_LDO3
21
°C
Thermal-Shutdown
Temperature Hysteresis
Output Noise
L3IN UVLO
www.maximintegrated.com
OUTNOISE
VUVLO_LDO3
10Hz to 100kHz, VL3IN = 5V,
VL3OUT = 3.3V
150
10Hz to 100kHz, VL3IN = 5V,
VL3OUT = 2.5V
125
10Hz to 100kHz, VL3IN = 5V,
VL3OUT = 1.2V
80
10Hz to 100kHz, VL3IN = 5V,
VL3OUT = 0.9V
60
VL3IN Falling
VL3IN Rising
µVrms
1.14
1.38
1.4
1.64
V
Maxim Integrated │ 14
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
28
V
CHGIN TO SYS PATH
(VCHGIN = 5.0V, VSYS = VSYS_REG)
Allowed CHGIN Input
Voltage Range
VCHGIN_RNG
VCHGIN Detect
Threshold
VCHGIN_DET
VCHGIN Overvoltage
Threshold
VCHGIN_OV
VCHGIN Overvoltage
Threshold Hysteresis
VCHGIN_OV_HYS
VCHGIN Valid Trip Point
VCHGIN-SYS_TP
VCHGIN Valid Trip Point
Hysteresis
VCHGIN-SYS_TP_HYS
Input Limiter Current
ILIM
-5.5
Rising
3.8
3.9
4.1
Falling
3.0
3.1
3.2
Rising
7.2
7.5
7.8
200
VCHGIN – VSYS, Rising,
VBAT = 4V
+30
+145
+290
0
ILimCntl[1:0] = 01
90
100
ILimCntl[1:0] = 10
450
550
ILimCntl[1:0] = 11
1000
VCAP
CHGIN-SYS Regulation
Voltage
VCHGIN-SYS
VCHGIN = 4V, ISYS = 1mA
40
CHGIN to SYS
On-Resistance
RCHGIN-SYS
VCHGIN = 4.4V, ISYS = 500mA
370
(Note 3)
+150
o
C
o
C
TCHGIN_SHDN
Thermal-Shutdown
Temperature Hysteresis
TCHGIN_SHDN_HYS
30
Input Current Soft-Start
Time
tSFST_LIM
1
Internal Supply
Switchover Threshold
VCCINT_TH
www.maximintegrated.com
VCHGIN = VCAP rising, VBAT = 4.2V
2.5
2.8
4.7
mA
Internal CAP Regulator
Thermal-Shutdown
Temperature
4.2
mV
mV
ILimCntl[1:0] = 00
3.9
V
mV
275
VCHGIN = 5V
V
V
mV
660
mΩ
ms
3.0
V
Maxim Integrated │ 15
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
3
3.06
2.92
2.98
3.04
UNITS
SYS, BATTERY, AND VCCINT UVLOs
SYS UVLO Threshold
VSYSUVLO_R
Rising
VSYSUVLO_F
Falling
V
SYS UVLO Threshold
Hysteresis
VSYSUVLO_HYS
Hysteresis
26
mV
SYS UVLO Falling
Debounce Time
tSYSUVLO_FDEB
SYS Falling
20
µs
VCCINT UVLO Threshold
(POR)
VUVLO
VCCINT UVLO Threshold
Hysteresis
VUVLO_HYS
BAT UVLO Threshold
VBAT_UVLO
BAT UVLO Threshold
Hysteresis
VBAT_UVLO_HYS
VCCINT Rising
0.8
1.82
2.6
140
Rising (Valid only when CHGIN is
present. When VBAT < VBAT_UVLO,
the BAT-SYS switch opens and
BAT is connected to SYS through a
diode.)
1.9
Hysteresis
V
mV
2.05
2.2
50
V
mV
BATTERY CHARGER (See Figure 5a and Figure 5b)
(VBAT = 4.2V. Typical values are at VCHGIN = 5.0V, VSYS = VSYS_REG)
Allowed BAT Voltage
Range
VBAT_RNG
BAT to SYS
On-Resistance
RBAT-SYS
VBAT = 4.2V, IBAT = 300mA
80
Current Reduce Thermal
Threshold Temperature
TCHG_LIM
(Note 4)
120
0
5.5
V
140
mΩ
o
C
BAT-to-SYS Switch-On
Threshold
VBAT-SYS-ON
SYS falling
10
22
35
mV
BAT-to-SYS Switch-Off
Threshold
VBAT-SYS-OFF
SYS rising
-3
-1.5
0
mV
VBatReg
+ 140mV
VBatReg
+ 200mV
VBatReg
+ 260mV
V
SYS-BAT Regulation
Voltage
www.maximintegrated.com
VSYS_REG
VCHGIN = 5V, ISYS = 1mA
Maxim Integrated │ 16
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYS Threshold Voltage
Charger Limiting Current
(Note 5)
Charger Current SoftStart Time
SYMBOL
VSYS_LIM
MIN
TYP
MAX
SysMin = 000,
VBAT > 3.6V
CONDITIONS
VBAT+
0.1
SysMin = 000,
VBAT < 3.4V
3.6
SysMin = 001,
VBAT < 3.4V
3.7
SysMin = 010,
VBAT < 3.4V
3.8
SysMin = 011,
VBAT < 3.4V
3.9
SysMin = 100,
VBAT < 3.4V
3.86
4
4.14
SysMin = 101,
VBAT < 3.4V
4.1
SysMin = 110,
VBAT < 3.4V
4.2
SysMin = 111,
VBAT < 3.4V
4.3
tCHG_SOFT
1
UNITS
V
ms
PRECHARGE
IPChg = 00
Precharge Current
IPCHG
IPChg = 01
Prequalification
Threshold Hysteresis
www.maximintegrated.com
VBAT_PChg
VBAT_PChg_HYS
10
IPChg = 10
20
IPChg = 11
30
VPChg = 000
2.1
VPChg = 001
Prequalification
Threshold
5
9
2.15
2.25
VPChg = 010
2.40
VPChg = 011
2.55
VPChg = 100
2.7
VPChg = 101
2.85
VPChg = 110
3.0
VPChg = 111
3.15
90
11
%IFChg
2.35
V
mV
Maxim Integrated │ 17
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
FAST CHARGE
SET Current Gain Factor
KSET
2000
A/A
SET Regulation Voltage
VSET
1
V
RSET = 400kΩ
Fast-Charge Current
Fast-Charge Current
Accuracy (Note 6)
IFChg
IFChg_ACC
5
RSET = 40kΩ
45
50
55
RSET = 4kΩ
450
500
550
RSET Range = 4kΩ to 40kΩ
-10
+10
mA
%
MAINTAIN CHARGE
ChgDone = 00
Charge Done
Qualification
IChg_DONE
ChgDone = 01
5
8.5
ChgDone = 10
ChgDone = 11
30
BatReg = 0000
4.05
BatReg = 0001
4.10
BatReg =
0011
BAT Recharge
Threshold
www.maximintegrated.com
VBatReg
VBatReChg
11.5
20
BatReg = 0010
BAT Regulation Voltage
(Note 7)
10
%IFChg
4.15
TA = +25°C
4.179
TA = 0 to +45C
4.168
4.2
4.221
4.2
4.232
BatReg = 0100
4.25
BatReg = 0101
4.3
BatReg = 0110
4.35
BatReg = 0111
4.4
BatReg = 1000
4.45
BatReg = 1001
4.5
BatReg = 1010
4.55
V
BatReg = 1011
4.6
BatReChg = 00
VBatReg - 70
BatReChg = 01
VBatReg - 120
BatReChg = 10
VBatReg -170
BatReChg = 11
VBatReg -220
mV
Maxim Integrated │ 18
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CHARGER TIMER
Maximum
Prequalification Time
Maximum Fast-Charge
Time
Maintain-Charge Time
Timer Accuracy
Timer Extend Threshold
Timer Suspend
Threshold
tPChg
tFChg
tTOChg
PChgTmr = 00
30
PChgTmr = 01
60
PChgTmr = 10
120
PChgTmr = 11
240
FChgTmr = 00
75
FChgTmr = 01
150
FChgTmr = 10
300
FChgTmr = 11
600
TOChgTmr = 00
0
TOChgTmr = 01
15
TOChgTmr = 10
30
TOChgTmr = 11
60
tCHG_ACC
-10
min
min
min
+10
%
TIMEXD_THRES
If charge current is reduced due to
ILIM or TDIE this is the percentage
of charge current below which timer
clock operates at half speed
50
%IFChg
TIMSUS_THRES
If charge current is reduced due to
ILIM or TDIE this is the percentage
of charge current below which timer
clock pauses
20
%IFChg
THERMISTOR MONITOR AND NTC DETECTION
THM Hot Threshold
T4
VTHM falling
30.9
32.9
34.9
VTHM falling
21.3
23.3
25.3
VTHM falling
48
50
52
VTHM falling
30.9
32.9
34.9
THM Warm Threshold
T3
THM Cool Threshold
T2
VTHM rising
62.5
64.5
66.5
THM Cold Threshold
T1
VTHM rising
71.9
73.9
75.9
THM Disable Threshold
THMDIS
VTHM rising
91
93
95
THM Threshold
Hysteresis
THMHYS
THM Input Leakage
ILKG_THM
www.maximintegrated.com
60
-1
%CAP
mV
1
µA
Maxim Integrated │ 19
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
START UP TIMING (See Figure 2)
Boot Delay
Boot Delay Timer
Accuracy
tRST
BootDly = 00
80
BootDly = 01
120
BootDly = 10
220
BootDly = 11
420
tRST_ACC
-10
Input Logic-High (SDA,
SCL, MPC0, MPC1,
PFN1, PFN2)
VIH
1.4
Input Logic-Low (SDA,
SCL, MPC0, MPC1,
PFN1, PFN2)
VIL
Output Logic-Low (SDA,
RST, INT, LED, PFN2)
VOL
High Level Leakage
Current (SDA, RST, INT,
LED, PFN2)
ms
10
%
DIGITAL SIGNALS
V
0.5
0.4
V
ILK
1
µA
SCL Clock Frequency
fSCL
400
kHz
Bus Free Time Between
a STOP and START
Condition
tBUF
START Condition
(Repeated) Hold Time
tHD:STA
IOL = 4mA
V
(Note 8)
1.3
µs
0.6
µs
Low Period of SCL
Clock
tLOW
1.3
µs
High Period of SCL
Clock
tHIGH
0.6
µs
Setup Time for a
Repeated START
Condition
tSU:STA
0.6
µs
Data Hold Time
tHD:DAT
(Note 9)
0
Data Setup Time
tSU:DAT
(Note 9)
100
ns
Setup Time for STOP
Condition
tSU:STO
0.6
µs
Spike Pulse Widths
Suppressed by Input
Filter
tSP
www.maximintegrated.com
(Note 10)
0.9
50
µs
ns
Maxim Integrated │ 20
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Electrical Characteristics (continued)
(VCHGIN = 5.0V, VBAT = 3.7V, TA = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
Note 1:
Note
Note
Note
Note
Note
Note
Note
Note
Note
All devices are 100% production tested at TA = +25°C. Limits over the operating temperature range guaranteed by
design.
2: This value is included in the IBAT quiescent current values for the ON states.
3: When the die temperature exceeds TCHGIN_SHDN, the CHGIN to SYS path opens, and the charger is turned off.
4: When the die temperature exceeds TCHG_LIM, the charger current starts to decrease.
5: This is the threshold at which the charger starts to limit the current due to SYS dropping; if VSYS drops below this value
the charger will not move to maintain charge.
6: Fast charge current accuracy tested only at 50mA and 500mA, all other values guaranteed by design.
7: Values over temperature are not production tested and guaranteed by characterization.
8: fSCL must meet the minimum clock low time plus the rise/fall times.
9: The maximum tHD:DAT has to be met only if the device does not stretch the low period (tLOW) of the SCL signal.
10: Filters on SDA and SCL suppress noise spikes at the input buffers and delay the sampling instant.
www.maximintegrated.com
Maxim Integrated │ 21
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Typical Operating Characteristics
(VBAT = 3.7V, VCHGIN = 0V, registers in their default state, TA = +25°C, unless otherwise noted.)
IBAT vs. VBAT
toc01
BUCKS ON, ALL LDOS ON
BUCKS ON, LDO1 ON
BUCKS ON
2
POWER OFF
-40
-15
10
35
60
BUCKS ON
4
2
0
85
BUCKS ON, LDO1 ON
6
3.0
3.3
TEMPERATURE (°C)
VBAT_REG vs. TEMPERATURE
IBAT (mA)
VBAT_REG (V)
3.9
35
VBAT
60
0
85
6
-15
0
40
80
120
ICHGIN vs. TEMPERATURE
5
4
4
160
200
240
280
2
2
1
1
0
0
3
4
-40
-15
10
35
toc09
3.05
TEMPERATURE (°C)
www.maximintegrated.com
VBAT = 3.3V, 3.7V, 4.2V
3.00
2.95
60
85
2.90
8
VL2OUT = 3.0V
VL2OUT (V)
VL1OUT (V)
ILimCntl[1:0] = 0x01
7
3.10
3.05
ILimCntl[1:0] = 0x02
0
6
VL2OUT vs. LOAD
toc08
VBAT = 3.3V, 3.7V, 4.2V
200
5
VL1OUT = 3.0V
400
85
VCHGIN (V)
3.10
VBAT = 3.7V
VCHGIN = 5V
ISYS = 600mA
60
3
VL1OUT vs. LOAD
toc07
35
VBAT = 2.8V
RSYS = 50Ω
TIME (minutes)
800
10
toc06
6
5
3
IBAT
TEMPERATURE (°C)
600
-40
VSYS vs. VCHGIN
40
10
VBAT = 2V
TEMPERATURE (°C)
120
80
-15
0
4.2
150mAhr BATTERY
IChgDone[1:0]= 01
IPChg[1:0=01
VPChg[2:0]=110
RSET = 40kΩ
160
4.19
ICHGIN (mA)
3.6
toc05
200
VCHGIN = 5V
BatReg[2:0] = 011
RSET = 40kΩ
4.2kΩ at BAT
-40
VBAT = 3.7V
IBAT/ VBAT vs. TIME
toc04
4.20
4.18
40
VBAT (V)
4.22
4.21
60
20
POWER OFF
2.7
VCHGIN = 5V
RSET = 40kΩ
IPChg[1:0] = 01
80
BUCKS ON, ALL LDOS ON
VSYS (V)
4
8
toc03
100
VBAT (V)
6
0
IBAT (µA) BATTERY INPUT CURRENT
IBAT (µA) BATTERY INPUT CURRENT
VBAT = 3.7V
8
IFCHG vs. TEMPERATURE
toc02
10
IFCHG (mA)
IBAT vs. TEMPERATURE
10
3.00
2.95
0
20
40
60
IL1OUT (mA)
80
100
2.90
0
20
40
60
80
100
IL2OUT (mA)
Maxim Integrated │ 22
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Typical Operating Characteristics (continued)
(VBAT = 3.7V, VCHGIN = 0V, registers in their default state, TA = +25°C, unless otherwise noted.)
VL3OUT vs. LOAD
LDO1 TRANSIENT RESPONSE
LDO1 TRANSIENT RESPONSE
toc11
toc10
3.10
toc12
VL1OUT = 3.0V
VL3OUT = 3.0V
VL1OUT = 3.0V
3.05
VL3OUT (V)
VBAT = 3.3V, 3.7V, 4.2V
VOUT
200mV/div
VOUT
200mV/div
IOUT
50mA/div
IOUT
50mA/div
3.00
2.95
2.90
0
20
40
60
80
100ms/div
100
40µs/div
IL3OUT (mA)
LDO2 TRANSIENT RESPONSE
LDO2 TRANSIENT RESPONSE
toc13
LDO3 TRANSIENT RESPONSE
toc15
toc14
VL2OUT = 3.0V
VL3OUT = 3.0V
VL2OUT = 3.0V
VOUT
200mV/div
VOUT
200mV/div
VOUT
200mV/div
IOUT
50mA/div
IOUT
50mA/div
IOUT
50mA/div
100ms/div
BUCK2 EFFICIENCY vs. LOAD
toc16
100
VL3OUT = 3.0V
90
EFFICIENCY (%)
70
60
50
50mA/div
80
VBAT = 3.7V
VBAT = 3.3V
40
0
0.001
0.1
10
IB2OUT (mA)
www.maximintegrated.com
VBAT = 4.2V
70
60
50
VBAT = 3.7V
VBAT = 3.3V
40
30
VB2OUT = 1.8V
INDUCTOR = TOKO
DFE201610E0-2R2M
20
10
40µs/div
toc18
90
30
IOUT
100
VBAT = 4.2V
80
200mV/div
BUCK2 EFFICIENCY vs. LOAD
toc17
EFFICIENCY (%)
LDO3 TRANSIENT RESPONSE
VOUT
100ms/div
40µs/div
20
VB2OUT = 0.7V
INDUCTOR = TOKO
DFE201610E0-2R2M
10
1000
0
0.001
0.1
10
1000
IB2OUT (mA)
Maxim Integrated │ 23
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Typical Operating Characteristics (continued)
(VBAT = 3.7V, VCHGIN = 0V, registers in their default state, TA = +25°C, unless otherwise noted.)
VB2OUT vs. LOAD
1.90
toc19
VB2OUT vs. LOAD
0.80
100
VB2OUT = 0.7V
VB2OUT = 1.8V
VBAT = 3.3V, 3.7V, 4.2V
VBAT = 3.3V, 3.7V, 4.2V
0.72
1.78
0.68
1.74
0.64
VBAT = 4.2V
80
EFFICIENCY (%)
VB2OUT (V)
1.82
toc21
90
0.76
1.86
VB2OUT (V)
BUCK1 EFFICIENCY vs. LOAD
toc20
70
VBAT = 3.7V
60
VBAT = 3.3V
50
40
30
20
VB1OUT = 1.2V
INDUCTOR = TOKO
DFE201610E0-2R2M
10
1.70
0
100
200
300
0.60
400
0
100
200
IB2OUT (mA)
BUCK1 EFFICIENCY vs. LOAD
0.1
10
1000
IB1OUT (mA)
VB1OUT vs. LOAD
toc22
VB1OUT vs. LOAD
toc23
1.30
0.80
VB1OUT = 1.2V
90
toc24
VB1OUT = 0.7V
1.25
80
VBAT = 4.2V
0.75
VBAT = 3.7V
60
VBAT = 3.3V
1.20
VB1OUT (V)
70
VB1OUT (V)
EFFICIENCY (%)
0
0.001
400
IB2OUT (mA)
100
50
300
1.15
0.70
40
1.10
30
20
VB1OUT = 0.7V
INDUCTOR = TOKO
DFE201610E0-2R2M
10
0
0.001
0.1
10
VBAT = 3.3V, 3.7V, 4.2V
0.65
VBAT = 3.3V, 3.7V, 4.2V
1.05
1.00
1000
0
100
IB1OUT (mA)
200
300
0.60
400
0
100
BUCK1 TRANSIENT RESPONSE
400
toc26
VB1OUT = 1.2V
VB2OUT = 1.8V
VB1OUT
20mV/div
VB2OUT
20mV/div
IB1OUT
50mA/div
IB2OUT
50mA/div
www.maximintegrated.com
300
BUCK2 TRANSIENT RESPONSE
toc25
20µs/div
200
IB1OUT (mA)
IB1OUT (mA)
20µs/div
Maxim Integrated │ 24
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Bump Configuration
TOP VIEW
(BUMP SIDE DOWN)
MAX20335
1
2
3
4
5
6
A
L1OUT
L1IN
CAP
GND
B2OUT
B2LX
B
L2OUT
L2IN
INT
MON
BAT
BAT
C
L3OUT
L3IN
GND
GND
SET
SYS
D
LED
PFN2
GND
GND
EXT
SYS
E
RST
MPC0
MPC1
PFN1
CHGIIN
CHGIN
F
SDA
SCL
THM
GND
B1OUT
B1LX
+
WLP
(2.72mm x 2.47mm)
Bump Description
BUMP
NAME
A1
L1OUT
A2
L1IN
LDO1 Input
A3
CAP
Bypass for Internal LDO. Bypass with a 1µF capacitor to GND.
A4, C3, C4
D3, D4, F4
GND
Ground
A5
B2OUT
A6
B2LX
B1
L2OUT
B2
L2IN
LDO2 Input
B3
INT
Open-Drain, Active-Low Interrupt Output.
B4
MON
Voltage Monitor Pin
B5,B6
BAT
Battery Connection. Connect BAT to a positive battery terminal, bypass BAT with a minimum 1µF
capacitor to GND.
www.maximintegrated.com
FUNCTION
LDO1 Output. Bypass with a minimum 1µF capacitor to GND.
0.7V to 3.85V Buck Regulator Output Feedback. Bypass with a 10µF capacitor to GND.
0.7V to 3.85V Buck Regulator Switch. Connect 2.2µH inductor to B2OUT.
LDO2 Output. Bypass with a minimum 1µF capacitor to GND.
Maxim Integrated │ 25
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Bump Description (continued)
PIN
NAME
FUNCTION
C1
L3OUT
C2
L3IN
LDO3 Input
C5
SET
External Resistor For Battery Charge Current Level Setting. Do not connect any external capacitance
on this pin; maximum allowed capacitance (CSET < 5µs/RSET) pF.
C6, D6
SYS
System Load Connection. Connect SYS to the system load. Bypass SYS with a minimum 10µF lowESR ceramic capacitor to GND.
D1
LED
LED Open-Drain Pulldown Current. Add an external current limiting pullup resistor.
D2
PFN2
D5
EXT
Push-Pull Gate Drive for Optional External pFET from BAT-to-SYS. Output is pulled to GND when
charger is disconnected and internal BAT-SYS FET is switched on. Otherwise, this output is pulled
high to the SYS voltage.
E1
RST
Power-On Reset Output. Active-low, open-drain.
E2
MPC0
Multipurpose Configuration Input 0
E3
MPC1
Multipurpose Configuration Input 1
E4
PFN1
Power Function Control Input. Programmable functionality via PwrFnMode. See Table 1.
E5, E6
CHGIN
F1
SDA
Open-Drain, I2C Serial Data Input/Output.
F2
SCL
I2C Serial Clock Input
F3
THM
Battery Temperature Thermistor Measurement Connection. Connect a 10kΩ resistor from THM to
CAP and a 10kΩ, 3380β NTC thermistor from THM to GND.
F5
B1OUT
0.7V to 2.275V Buck Regulator Output Feedback. Bypass B1OUT with a 10µF capacitor to GND.
F6
B1LX
0.7V to 2.275V Buck Regulator Switch Terminal. Connect B1LX to B1OUT with a 2.2µH inductor.
LDO3 Output. Bypass with a minimum 1µF capacitor to GND.
Power Function Control Input/Output. Programmable functionality via PwrFnMode. See Table 1.
-5.5V/+28V Protected Charger Input. Bypass CHGIN with 1µF capacitor to GND.
Note: All capacitance values listed in this document refer to effective capacitance. Be sure to specify capacitors that will meet these
requirements under typical system operating conditions taking into consideration the effects of voltage and temperature.
www.maximintegrated.com
Maxim Integrated │ 26
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Block Diagram
MAX20335
POWER
28V/-5.5V INPUT
PROTECTION
LINEAR
Li+ BATTERY CHARGER
WITH POWER SELECTOR
POWER
SEQUENCER
BUCK 1
MONITOR
BUCK 2
LDO/SWITCH 1
DATA
CONTROL
LDO/SWITCH 2
SYS
Detailed Description
Power Regulation
The MAX20335 family includes two high-efficiency, low
quiescent current buck regulators, and three low quiescent
current linear regulators that are also configurable as
power switches. Excellent light-load efficiency allows
the switching regulators to run continuously without
significant energy cost.
www.maximintegrated.com
LDO/SWITCH 3
Power On/Off and Reset Control
The behavior of power function control pins (PFN1 and
PFN2) is preconfigured to support one of the multiple
types of wearable application cases. Table 1 describes
the behavior of the PFN1 and PFN2 pins based on
the PwrRstCfg[3:0] bits and Figure 1 shows basic flow
diagrams associated with each mode.
A Soft-Reset generates a 10ms logic low pulse at RST
and resets all registers to their default values. A HardReset initiates a complete Power-On Reset sequence and
generates a 50ms logic-low pulse at RST.
Maxim Integrated │ 27
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Table 1. Power Function Input Control Modes
PwrRstCfg[3:0]**
PFN1**
PFN1 PU/PD
PFNxResEna = 1
PFN2**
PFN2 PU/PD
PFNxResEna = 1
ENABLE
PULLDOWN
Manual Reset
PULLUP*
Available PwrCmd
OFF
HARD SOFT
NO
NO
YES
On/Off
On/Off Mode with 10ms debounce. PFN1 is the active-high on/off control input. PFN2 is the active-low softreset input.
On/Off
On/Off Mode with 10ms debounce. PFN1 is the active-low on/off control. PFN2 is the active-low soft-reset
input.
DISABLE
Hard-Reset on PFN1
Rising
AON
CR High
CR Low
Hard-Reset on CHGIN
insertion When PFN1
High
Hard-Reset on CHGIN
Insertion
When PFN1 low
YES
NO
YES
YES
YES
PULLUP*
Soft-Reset on
PFN2 Falling
PULLUP*
YES
YES
YES
PULLDOWN
Soft-Reset CHGIN
Insertion When
PFN2 High
PULLDOWN
YES
YES
YES
PULLUP*
Soft-Reset on
CHGIN Insertion
When PFN2 Low
PULLUP*
YES
YES
YES
Charger Reset Low Mode. When PFN1 is low, a CHGIN insertion generates a Hard-Reset after a 200ms
delay. When PFN2 is low, a CHGIN insertion generates a Soft-Reset after a 200ms delay. In this mode, the
device can only enter the off state by writing to the PwrCmd register.
PULLUP*
KOUT
NONE
YES
YES
YES
Custom Button Mode. PFN1 is the active-low KIN button input. PFN2 is the open-drain KOUT output, which
buffers the KIN input. The device can enter the off state by either a KIN press (>12s) or by writing to the
PwrCmd register. A CHGIN insertion or a KIN press (>400ms) can exit the off state.
PULLUP*
KOUT
NONE
YES
NO
NO
Custom Soft Reset 1. PFN1 is the active-low KIN button input. PFN2 is the open-drain KOUT output, which
buffers the KIN input. A KIN press (>12s) generates a soft-reset. The device can only enters the off state
through the PwrCmd register. A CHGIN insertion or a KIN press (>3s) can exit the off state.
KIN
CSR2
PULLDOWN
NO
Charger Reset High Mode. When PFN1 is high, a CHGIN insertion generates a hard-reset after a 200ms
delay. When PFN2 is high, a CHGIN insertion generates a soft-reset after a 200ms delay. In this mode, the
device can only enter the off state by writing to the PwrCmd register.
KIN
CSR1
Soft-Reset on
PFN2 Rising
PULLUP*
Always-On Mode. A falling edge on PFN1 generates a hard-reset after a 200ms delay. A falling edge on PFN2
generates a soft-reset after a 200ms delay. In this mode, the device can only enter the off state by writing to
the PwrCmd register.
KIN
KIN
PULLDOWN
Manual Reset
Always-On Mode. A rising edge on PFN1 generates a hard reset after a 200ms delay. A rising edge on PFN2
generates a soft-reset after a 200ms delay. In this mode, the device can only enter the off state by writing to
the PwrCmd register.
Hard-Reset on PFN1
Falling
AON
PULLUP*
PULLUP*
Manual Reset
NONE
YES
YES
YES
Custom Soft-Reset 2. PFN1 is the active-low KIN button input. PFN2 is the active-low soft-reset input. A PFN2
press (>12s) generates a soft-reset. In this mode, the device can only enter the off state by writing to the
PwrCmd register.
* Pullup is connected to an internal supply, VCCINT. (VCCINT = VCAP if VCAP > VCCINT_TH, or VCCINT = VBAT if VCAP < VCCINT_TH).
** PwrRstCfg[3:0] is read-only; the functions of PFN1 and PFN2 cannot be changed through I2C
www.maximintegrated.com
Maxim Integrated │ 28
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Figure 1. Power Function Input Control Modes Flow Diagrams
www.maximintegrated.com
Maxim Integrated │ 29
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Power Sequencing
There are multiple configuration options for the sequencing of the buck regulators and LDOs during power-on. See
Table 1 for details. Regulators can be configured to turn
on at one of the four points during the power-on process:
0% tRST, 25% tRST, 50% tRST, and 100% tRST. The reset
delay tRST can be set to 80ms, 120ms, 220ms, or 420ms
by BootDly[1:0] in the BootCfg register. The power-on
sequencing is depicted in Figure 2a and Figure 2b.
Additionally, the regulators can be selected to default off
and can be turned on with an I2C command after RST is
released. Each LDO regulator can be configured to be
always-on as long as SYS or BAT is present.
In general, if an undervoltage condition is detected on
SYS the device goes into the off state. However if there
is a valid voltage on CHGIN the behavior is determined
by the ChgAlwTry setting. If ChgAlwTry = 0, and an
undervoltage condition is detected on SYS during the
sequencing process the device turns SYS and all other
external resources off and waits for CHGIN removal. On
CHGIN removal the device enters the off state to avoid
draining the battery. If ChgAlwTry = 1, the process will
continually recheck the SYS undervoltage condition every
500ms until it is no longer vaild before continuing with the
sequencing process.
tRST
POR
CHGIN INSERTION
OR KIN PRESS*
15ms
SYS
CHGIN INSERTION
KIN PRESS
30ms
30ms
ENABLE VIA
I2C/MPC
15ms
5ms
ENABLE VIA
I2C/MPC
LDO_En
BUCK_En**
BUCK
CANNOT BE
ALWAYS ON
RST
_Seq
001
010
011
100
111
% OF tRST
ALWAYS-ON
0%
25%
50%
100%
*KIN PRESS TURN-ON ENABLED VIA SPECIFIC PwrRstCfg ONLY
**AFTER BEING ENABLED, THE BUCK CONVERTERS HAVE AN 8ms (TYP) BLANKING TIME BEFORE THE OUTPUT VOLTAGE STARTS TO RISE.
Figure 2a. Power-On Sequencing
www.maximintegrated.com
Maxim Integrated │ 30
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
tRST
POR
CHGIN
30ms
SYS
15ms
ENABLE VIA
I2C/MPC
ENABLE VIA
I2C/MPC
LDO_En
15ms
Buck_En*
BUCK CANNOT
BE ALWAYS ON
RST
001
010
011
100
111
ALWAYS-ON
0%
25%
50%
100%
_Seq
% of tRST
*After being enabled, the buck converters have an 8ms (typ) blanking time before the output voltage starts to rise.
Figure 2b. Power-On Sequencing Without Battery
Smart Power Selector
The smart power selector seamlessly distributes power
from the external CHGIN input to the battery (BAT) and
the system (SYS). With both an external adapter and
battery connected, the smart power selector basic
functions are:
● When the system load requirements are less than the
input current limit, the battery is charged with residual
power from the input.
● When the system load requirements exceed the
input current limit, the battery supplies supplemental
current to the load.
www.maximintegrated.com
● When the battery is connected and there is no
external power input, the system is powered from the
battery.
Thermal Current Regulation
In case the die temperature exceeds the normal limit, the
MAX20335 will attempt to limit the temperature increase
by reducing the input current from CHGIN. In this condition, the system load has priority over charger current, so
the input current is first reduced by lowering the charge
current. If the junction temperature continues to rise and
reaches the maximum operating limit, no input current
is drawn from CHGIN and the battery powers the entire
system load.
Maxim Integrated │ 31
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
System Load Switch
Note: The body diode of an external pMOS connected
between BAT and SYS remains present when the device
is in off mode.
An internal 80mΩ (typ) MOSFET connects SYS to BAT
when no voltage source is available on CHGIN. When an
external source is detected at CHGIN, this switch opens
and SYS is powered from the input source through the
input current limiter. The SYS-to-BAT switch also prevents
VSYS from falling below VBAT when the system load
exceeds the input current limit. If VSYS drops to VBAT due
to the current limit, the load switch turns on so the load is
supported by the battery. If the system load continuously
exceeds the input current limit the battery is not charged.
This is useful for handling loads that are nominally below
the input current limit but have high current peaks exceeding
the input current limit. During these peaks, battery energy
is used, but at all other times the battery charges. See
Figure 3.
Input Limiter
The input limiter distributes power from the external
adapter to the system load and battery charger. In
addition to the input limiter’s primary function of passing
power to the system load and charger, it performs several
additional functions to optimize use of available power:
Invalid CHGIN Voltage Protection: If CHGIN is above
the overvoltage threshold, the MAX20335 enters
overvoltage lockout (OVL). OVL protects the MAX20335
and downstream circuitry from high-voltage stress up to
28V and down to -5.5V. During OVL, the internal circuit
remains powered and an interrupt is sent to the host.
During OVL, the charger turns off and the system load
switch closes, allowing the battery to power SYS. CHGIN
is also invalid if it is less than VBAT, or less than the USB
undervoltage threshold. With an invalid input voltage, the
SYS-to-BAT load switch closes and allows the battery to
power SYS.
The pin EXT can drive the gate of an external pMOS
connected between SYS (source, bulk) and BAT (drain) in
parallel to the internal one.
When VCHGIN < VBDET the EXT voltage is the buffered
version of the internal gate command that controls the
internal 80mΩ (typ) MOSFET.
VCHG
VSYS
VBAT
CLOSED
OPEN
OPEN
`
SYS SWITCH
CLOSE
ILIM
ICHG
IBAT
ISYS
0mA
SMART POWER SELECTOR
OPERATION WITH LIMITED VB
CURRENT
CONSTANT BAT
VOLTAGE
CHARGE
DONE
Figure 3. Smart Power Selector Current/Voltage Behavior
www.maximintegrated.com
Maxim Integrated │ 32
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
CHGIN Adaptive Input Current Limit: The CHGIN input
current is limited to prevent input overload. The input
current limit is controlled by I2C. However, if the voltage
at CHGIN collapses because the source is not able to
supply either the current programmed in I2C, or the total
current required by the battery charger and system load,
the input current limit will be adaptively reduced.
Thermal Limiting: In case the die temperature exceeds
the normal limit (TCHG_LIM), the MAX20335 attempts to
limit temperature increase by reducing the input current
from CHGIN. In this condition, the system load has priority over the charger current, so the input current is first
reduced by lowering the charge current. If the junction
temperature continues to rise and reaches the maximum
operating limit (TCHGIN_SHDN), no input current is drawn
from CHGIN and the battery powers the entire system
load.
Adaptive Battery Charging: While the system is powered
from CHGIN, the charger draws power from SYS to charge
the battery. If the total load exceeds the input current limit,
an adaptive charger control loop reduces charge current to
prevent VSYS from collapsing.
When the charge current is reduced below 50% due to
ILIM or TDIE, the timer clock operates at half speed. When
the charge current is reduced below 20% due to ILIM or
TDIE, the timer clock is paused.
Fast-Charge Current Setting
The MAX20335 uses an external resistor connected from
SET to GND to set the fast-charge current. The pre-charge
and charge-termination currents are programmed as a
percentage of this value through I2C registers. The fastcharge current resistor can be calculated as:
RSET = KSET x VSET/IFChg
Thermistor Monitoring with Charger Shutdown
The MAX20335 features three modes for controlling
charger behavior based on battery-pack temperature:
Thermistor Monitoring, JEITA Monitoring 1, and JEITA
Monitoring 2. The divider formed by a pull-up resistor
(RPU) to CAP, optional parallel resistor (RPA) from THM
to ground, and NTC thermistor (RTHM) from THM to
ground, provides a voltage at THM that is proportional to
temperature as a fraction of the CAP voltage. Two sets
of preconfigured default thresholds (0°C/10°C/45°C/60°C
or 0°C/10°C/25°C/45°C as a %CAP) optimized for beta
3380 thermistors are available (see Table 38). The four
default thresholds create five temperature zones, and the
fractional CAP voltage measured at the THM pin is
compared to the thresholds to determine the active
temperature zone during operation.
The behavior in each temperature zone is determined by
the configuration of bits in the I2C registers. The active
monitoring mode is selected by ThermEn[1:0] in the
ThrmCfrg register. In all modes, the T2IFchg[2:0] and
T2T3IFchg[2:0], and T3T4IFchg[2:0] fields in the ThrmCfg
registers set the fast charge current in three temperature zones, T1_T2, T2_T3, and T3_T4. In Thermistor
Monitoring mode, charging is enabled only in T1_T2
and T2_T3 and the battery termination voltage is equal
to VBATREG, as shown in Figure 4a. In both JEITA
Monitoring 1 and JEITA Monitoring 2 the charger is
active in the T1_T2, T2_T3, and T3_T4 zones. However,
JEITA Monitoring 1 sets the battery termination voltage to
VBATREG for all zones, while JEITA Monitoring 2 sets the
battery termination voltage to VBATREG - 150mV for zones
T1_2 and T3_T4, as shown in Figure 4b. The behavior of
all three modes is summarized in Table 2.
where KSET has a typical value of 2000A/A and VSET has
a typical value of 1V. The range of acceptable resistors for
RSET is 4kΩ to 400kΩ
www.maximintegrated.com
Maxim Integrated │ 33
MAX20335
PMIC with Ultra-Low IQ Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
PREQUAL:
VBAT VSYS
OR ChgEn = 0
RESET CHARGE TIMER
T1 < T < T3
CHARGE SUSPEND
CHARGER OFF
FAULT
ChgStat = 000
LED = OFF
ICHG = 0
ChgStat = 111
LED = 0.15s PERIOD
ICHG = 0
ChgStat = 001
LED = 1.5s PERIOD
ICHG = 0
RECOVER FROM FAULT
RESET CHARGE TIMER
ChgEn = 1,
VSYS > VSYS_LIM RISE
MAINTAIN
CHARGE DONE
T < T1 or T > T3
VBAT < VBATREG – VBATRECHG
AND ChgAutoReSta = 1
AND VSYS > VSYS_LIM RISE
RESET CHARGE TIMER
PREQUAL
VBAT < VBAT_PChg
RESET CHARGE TIMER
(VOLTAGE MODE = 0*
AND VSYS > VSYS_LIM RISE)
OR VBAT < VBAT_PChg
ChgStat = 101
LED = ON
ICHG < ICHG_DONE
tMTCHG
NOTES:
ICHG > ICHG_DONE
ChgAutoStp = 0"
RESET CHARGE TIMER
ICHG < ICHG_DONE
AND
VSYS > VSYS_LIM RISE
AND
TDIE < TCHG_LIM
RESET CHARGE TIMER
PREQUAL SUSPEND
ChgStat = 001
LED = 1.5s PERIOD
ICHG = 0
T1 < T < T3
VBAT > VBAT_PChg
RESET CHARGE TIMER
FAST
CHARGE
(CONSTANT CURRENT)
ChgStat = 011
LED = ON
ICHG = IFCHG**
tCHG_TIMER > tMTCHG
AND
ChgAutoStp = 1
T < T1 or T > T3
T < T1 or T > T3
ChgStat = 010
LED = ON
ICHG = IPCHG
ChgStat = 110
LED = OFF
ICHG = 0
MAINTAIN
CHARGE
PAUSE
CHARGE
TIMER
TT3
PAUSE
CHARGE
TIMER
TT3
T1tPCHG
V BAT >V BAT_PChg
RESET CHARGE TIMER
FAST
CHARGE
(CONSTANT CURRENT )
tCHG_TIMER >tMTCHG
AND
ChgAutoStp =1
PREQUAL SUSPEND
T1
工商网监
湘ICP备2023018690号
