MP2619
The Future of Analog IC Technology
2A, 24V Input, 600kHz
2-3 Cell Switching Li-Ion Battery Charger
With System Power Path Management
DESCRIPTION
FEATURES
The MP2619 is a monolithic switching charger
for 2-3 cell Li-Ion battery packs with a built in
internal power MOSFET. It achieves up to 2A
charge current with current mode control for
fast loop response and easy compensation.
The charge current can be programmed by
sensing the current through an accurate sense
resistor.
MP2619 regulates the battery voltage and
charge current using two control loops to realize
high accuracy CC charge and CV charge.
The system power path management function
ensures continuous supply to the system by
automatically selecting the input or the battery to
power the system. Power path management
separates charging current from system load.
When the MP2619 realizes current sharing of
the input current, charge current will drop down
according to the increase of the system current.
Fault condition protection includes cycle -by
-cycle current limiting, and thermal shutdown.
Other safety features include battery temperature
monitoring, charge status indication and
programmable timer to finish the charging cycle.
The MP2619 is available in a 28-pin, 4mm x 5mm
QFN package.
MP2619 Rev. 1.02
11/9/2018
Charges 2-3 cell Li-Ion Battery Packs
Wide Operating Input Range
Up to 2A Programmable Charging Current
Power Path Management with Current
Sharing
±0.75% VBATT Accuracy
0.2Ω Internal Power MOSFET Switch
Up to 90% Efficiency
Fixed 600kHz Frequency
Preconditioning for Fully Depleted Batteries
Charging Operation Indicator
Input Supply and Battery Fault Indicator
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Battery Temperature Monitor and Protection
APPLICATIONS
Netbook PC
Distributed Power Systems
Chargers for 2-Cell or 3-Cell
Batteries
Pre-Regulator for Linear Regulators
Li-Ion
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
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© 2018 MPS. All Rights Reserved.
1
MP2619 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL APPLICATION
M3
M1
RS2
VIN
VSYS
20m
C10
10µF
R1 510
R2 510
RG1
PIN
C2
4.7µF
C7
0.1µF
BST
CELLS
OUT1
VREF33
R3
10k
L
4.7µF
RG2
SW
AIN
C1
10µF
22uF
M2
LED2
CHGOK ACOK VCC
C3
10µF
RG2
51
RG1
51
LED1
C8
MP2619
VREF25
RS1
110m
D1
VBAT
C9
22uF
2/3 cells
battery
RGS1 280
CSP
BATT
RGS2 280
NTC
RNTC
10k
EN
Charge On/Off
Power Path On/Off
SHDN
COMPV COMPI
R4
2.7k
C4
2.2nF
MP2619 Rev. 1.02
11/9/2018
R5
750
GND TMR
CTMR
0.1uF
C5
2.2nF
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2
MP2619 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
ORDERING INFORMATION
Part Number*
Package
Top Marking
MP2619EV
QFN-28 (4mmx5mm)
MP2619
* For Tape & Reel, add suffix –Z (eg. MP2619EV–Z).
For RoHS compliant packaging, add suffix –LF (eg. MP2619EV–LF–Z)
PACKAGE REFERENCE
TOP VIEW
AIN
PIN
SW
SW
BST
TMR
28
27
26
25
24
23
N/C
1
22
N/C
NTC
2
21
GND
ACOK
3
20
CSP
CHGOK
4
19
BATT
VREF33
5
18
COMPI
N/C
6
17
CELLS
EN
7
16
COMPV
SHDN
8
15
VCC
9
10
11
12
RG1
N/C
GND
N/C
13
14
OUT1 RG2
ABSOLUTE MAXIMUM RATINGS (1)
Recommended Operating Conditions (3)
Supply Voltage VIN ........................................ 26V
VSW ....................................... –0.3V to VIN + 0.3V
VBS ......................................................... VSW + 6V
VCSP, VBATT, ..................................–0.3V to +18V
All Other Pins ................................. –0.3V to +6V
Continuous Power Dissipation (TA = +25°C) (2)
............................................................... 3.1W
Junction Temperature ............................... 150C
Lead Temperature .................................... 260C
Storage Temperature ............... –65C to +150C
VCC, RG1, RG2 to GND..............–0.3V to +42V
Max Differential Input Voltage, RG1 to RG2...5V
Supply Voltage VIN............................ 5.5V to 24V
Output Voltage VOUT ......................... 0.8V to 20V
VCC, RG1, RG2 to GND .................2.5V to 40V
Operating Junction Temp. (TJ). -40°C to +125°C
MP2619 Rev. 1.02
11/9/2018
Thermal Resistance (4)
θJA
θJC
QFN-28 (4mmx5mm) .............. 40 ....... 9.... C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB
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3
MP2619 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
ELECTRICAL CHARACTERISTICS
VIN = 19V, TA = +25C, CELLS=0V, unless otherwise noted.
Parameters
Symbol Condition
Terminal Battery Voltage
CSP, BATT Current
Switch On Resistance
VBATT
ICSP,IBATT
RDS(ON)
CELLS=0V
CELLS= Float
Charging disabled
Min
Typ
Max
Units
8.337
12.505
8.4
12.6
1
0.2
8.463
12.695
V
0
1
EN = 4V, VSW = 0V
Switch Leakage
CC Mode
Peak Current Limit
CC current
Trickle Mode
ICC
Trickle charge current
RS1=100mΩ
1.8
μA
4.1
A
2
A
2.0
2.2
A
10%
Icc
Trickle charge voltage threshold
3.0
V/Cell
Trickle charge hysteresis
350
mV/Cell
Termination current threshold
Oscillator Frequency
Fold-back Frequency
Maximum Duty Cycle
Maximum current Sense Voltage
(CSP to BATT)
Under Voltage Lockout Threshold
Rising
Under Voltage Lockout Threshold
Hysteresis
Open-drain sink current
ITRICKLE
µA
Ω
IBF
fSW
NTC Low-Temp Rising Threshold
NTC High-Temp Falling Threshold
Vin min head-room (reverse blocking)
10%
VSENSE
Vdrain=0.3V
Stay at trickle charge,
CTMR=0.1µF
kHz
190
kHz
%
170
200
230
mV
3
3.2
3.4
V
200
1000
mV
5
Vrechg
RNTC=NCP18X103,
0°C
RNTC=NCP18X103,
50°C
Vin-Vbatt
mA
30
min
4.0
100
V/cell
mV/Cell
%of
VREF33
%of
VREF33
mV
70.5
73.5
76.5
27.5
29.5
31.5
180
0.4
1.8
EN Input High Voltage
MP2619 Rev. 1.02
11/9/2018
Icc
600
EN Input Low Voltage
EN Input Current
15%
90
Dead-battery indicator
Recharge threshold at Vbatt
Recharge Hysteresis
5%
CELLS=0V,
VBATT=7V
VBATT= 0V
V
V
EN = 4V
4
EN = 0V
0.2
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μA
4
MP2619 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
ELECTRICAL CHARACTERISTICS (continued)
VIN = 19V, TA = +25C, CELLS=0V, unless otherwise noted.
Parameters
Symbol
Condition
Min
EN = 4V
EN = 4V,
Consider VREF33 pin
output current.
R3=10k,RNTC=10k
Supply Current (Shutdown)
Supply Current (Quiescent)
Thermal Shutdown(5)
VREF33 output voltage
VREF33 load regulation
Input Current Sense Section
Supply Current
OUT1 Input Offset Voltage
OUT1 Current Accuracy
No-Load OUT1 Error
Low-Level OUT1 Error
Shutdown Supply Current
SHDN Threshold Voltage
SHDN Hysteresis
IAIN
ICC(SHDN)
VTH_SHUTD
OWN
0.665
mA
150
3.3
30
VSENSE = 100mV
VSENSE = 0V
VSENSE = 5mV
VSHDN = 3V
0.7
Units
mA
2.0
ILOAD= 0A, VCC = 40V
(Low High)
Max
0.5
EN = 0V,
CELLS=0V,
VBATT=4.5V
ILOAD=0 to 10mA
ICC
VOS1
IRG1/IGS
Typ
mA
°C
V
mV
12
0.4
±2
0.1
0.3
3
30
2
±5
1
2
6
µA
mV
%
µA
µA
µA
0.9
1.2
V
30
mV
Notes:
5) Guaranteed by design.
MP2619 Rev. 1.02
11/9/2018
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5
MP2619 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=19V, C1=4.7μF, C2=22μF, L=4.7μH, RS1=110mΩ, RS2=20mΩ, Real Battery Load, TA=25ºC,
unless otherwise noted.
2 Cells ICHG vs. VBATT Curve
2.5
2.5
8.1
1.5
8
7.9
1
7.8
IBATT
7.7
0.5
7.6
7.5
0
20
CHARGE CURRENT(A)
2
VBATT
8.2
BATTERY CURRENT(A)
VIN=12V
1
VIN=19V
0.5
0
0
2
6
8
100.0
1
VIN=24V
VIN=19V
90.0
EFFICIENCY(%)
EFFICIENCY(%)
1.5
0
11.8
IBATT
VIN=19V
80.0
1
11.6
11.4
0.5
11.2
100.0
2
0.5
1.5
12
0
VIN=24V
70.0
VIN=15V
90.0
VIN=19V
VIN=24V
80.0
70.0
3 Cells Battery
2 Cells Battery
0
2
4
6
8
10
12
14
60.0
0
0.4
B ATTER Y V OL TAGE(V )
0.8
8.4
8.4
BATT VOLTAGE(V)
8.5
8.3
8.2
MP2619 Rev. 1.02
11/9/2018
23
0.4
28
1.2
1.6
2
Charge Current
vs. Temperature
8.2
8
-20
0.8
ICHG (A)
8.3
2 Cells Battery
2 Cells Battery
18
0
2.2
8.1
8.1
VIN (V)
2
BATT Float Voltage
vs. Temperature
8.5
13
1.6
60.0
ICHG (A)
BATT Float Voltage vs. VIN
88
1.2
0
150
50
100
TIMES(MIN)
Effciency vs. ICHG
VIN=15V
VIN=12V
2
12.2
11
10
Effciency vs. ICHG
2.5
VBATT(V)
4
VBATT
12.4
BATTERY VOLTAGE(V)
3 Cells ICHG vs. VBATT Curve
C HA R G E C U R R E NT(A )
2
1.5
0
100 120
40 60
80
TIMES(MIN)
12.6
VIN=24V
0
20
40
60
TEMPERATURE (OC)
80
C HA R G E C U R R E NT(A )
BATTERY VOLTAGE(V)
8.3
2.5
12.8
8.4
BATTERY VOLTAGE(V)
8.5
3 Cells Battery Charge Curve
BATTERY CURRENT(A)
2 Cells Battery Charge Curve
2
1.8
1.6
1.4
2 Cells Battery
1.2
-20
0
20
40
60
80
TEMPERATURE (OC)
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6
MP2619 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=19V, C1=4.7μF, C2=22μF, L=4.7μH, RS1=110mΩ, RS2=20mΩ, Real Battery Load, TA=25ºC,
unless otherwise noted.
Efficiency vs. VIN
Current Sharing
NTC Control Window
VBATT=7.4V, ICHG=2A
3
2.5
Low Temp Off
2.5
2
89
86
83
5
10
MP2619 Rev. 1.02
11/9/2018
15
VIN (V)
20
1.5
High Temp On
1
High Temp Off
25
0
1.5
1
0.5
0.5
2 Cells Battery
80
2
Low Temp On
ICHG(A)
92
VNTC(V)
EFFICIENCY (%)
95
0
8
12
16
20
VIN (V)
24
28
0
0.5
1
1.5
ISYS(A)
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2
2.5
7
MP2619 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=19V, C1=4.7μF, C2=22μF, L=4.7μH, RS1=110mΩ, RS2=20mΩ, Real Battery Load, TA=25ºC,
unless otherwise noted.
Trickle Charge
CC Charge
CV Charge
2 Cells, ICHG = 2A, VBATT = 5V
2 Cells, ICHG = 2A, VBATT = 7.4V
2 Cells, ICHG = 2A, VBATT = 8.4V
VIN
10V/div.
VBATT
5V/div.
VSW
10V/div.
VIN
10V/div.
VIN
10V/div.
VBATT
5V/div.
VBATT
5V/div.
VSW
10V/div.
VSW
10V/div.
IBATT
500mA/div.
IBATT
200mA/div.
IBATT
1A/div.
Power On
Power Off
EN On
2 Cells, ICHG = 2A, VBATT = 8V
2 Cells, ICHG = 2A, VBATT = 8V
2 Cells, ICHG = 2A, VBATT = 8V
VEN
5V/div.
VIN
10V/div.
VBATT
5V/div.
VIN
10V/div.
VSW
10V/div.
VSW
10V/div.
VSW
10V/div.
IBATT
2A/div.
IBATT
2A/div.
VBATT
5V/div.
VBATT
5V/div.
IBATT
2A/div.
EN Off
NTC Control
Timer Out
2 Cells, ICHG = 2A, VBATT = 8V
2 Cells, ICHG = 2A, VBATT = 7.4V
2 Cells, ICHG = 2A, VBATT = 7.4V
VEN
5V/div.
VBATT
5V/div.
VNTC
2V/div.
VBATT
5V/div.
VSW
10V/div.
VSW
10V/div.
IBATT
2A/div.
IBATT
2A/div.
MP2619 Rev. 1.02
11/9/2018
VTMR
1V/div.
VACOK
5V/div.
VCHGOK
5V/div.
ICHG
2A/div.
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8
MP2619 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=19V, C1=4.7μF, C2=22μF, L=4.7μH, RS1=110mΩ, RS2=20mΩ, Real Battery Load, TA=25ºC,
unless otherwise noted.
Power Path
Power Path
Management_Current Sharing Management_Steady State
2 Cells, ICHG = 2A, VBATT = 7.4V
VIN
10V/div.
VBATT
5V/div.
ISYS
1A/div.
IBATT
1A/div.
2 Cells, ICHG = 2A, VBATT = 8V,
ISYS=0.8A
VIN
10V/div.
VIN
10V/div.
VSW
10V/div.
VBATT
5V/div.
IBATT
1A/div.
VSYS
5V/div.
ISYS
500mA/div.
IBATT
1A/div.
VEN
5V/div.
Power Path
Management_EN On
Power Path
Management_EN Off
2-Cell, ICHG=2A, VBATT=7.6V,
ISYS=1A, VIN=12V
2-Cell, ICHG=2A, VBATT=7.6V,
ISYS=1A, VIN=12V
VEN
5V/div.
VIN
10V/div.
VBATT
5V/div.
IBATT
1A/div.
VSYS
5V/div.
MP2619 Rev. 1.02
11/9/2018
VSYS
5V/div.
VBATT
5V/div.
ISYS
1A/div.
ICHG
1A/div.
VSYS
10V/div.
VBATT
2V/div.
ISYS
500mA/div.
ICHG
1A/div.
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9
MP2619 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
PIN FUNCTIONS
Pin #
Name
1,6,10,12,22
NC
No Connection
Thermistor Input. Connect a resistor from this pin to the pin VREF33 and the Thermistor
NTC
from this pin to ground.
Valid Input Supply Indicator. A logic LOW on this pin indicates the presence of a valid
ACOK input supply.
Charging Completion Indicator. A logic LOW indicates charging operation. The pin will
CHGOK become an open drain once the charging is complete.
Internal linear regulator 3.3V reference output. Bypass to GND with a 1μF ceramic
VREF33
capacitor.
2
3
4
5
7
EN
8
SHDN
9
RG1
11, 21
Description
On/Off Control Input.
Shutdown control of current sense amplifier. Connect to ground for normal operation.
Gain Resistor of current sense amplifier.
Ground. This pin is the voltage reference for the regulated output voltage. For this
GND,
reason care must be taken in its layout. This node should be placed outside of the D1 to
Exposed
C1 ground path to prevent switching current spikes from inducing voltage noise into the
Pad
part. Connect exposed pad to ground plane for optional thermal performance.
13
OUT1
Output for Driving Resistor Load.
14
RG2
Gain Resistor of current sense amplifier.
15
VCC
Power Input of current sense amplifier.
16
COMPV VLOOP Compensation. Decouple this pin with a capacitor and a resistor.
17
CELLS
18
COMPI ILOOP Compensation. Decouple this pin with a capacitor and a resistor.
Command Input for the Number of Li-Ion Cells. Connect this pin to VREF33 or keep it
float for 3-cell operation or ground the pin for 2-cell operation.
19
BATT
Positive Battery Terminal.
20
CSP
Battery Current Sense Positive Input. Connect a resistor RS1 between CSP and BATT.
23
TMR
24
BST
25, 26
SW
Switch Output.
27
PIN
Power Supply Voltage. The MP2619 operates from a +5.5V to +24V unregulated input.
C1 is needed to prevent large voltage spikes from appearing at the input.
28
AIN
Controller Supply Voltage.
MP2619 Rev. 1.02
11/9/2018
Set time constant. 0.1µA current charges and discharges the external cap. DO NOT
CONNECT THIS PIN TO GND DIRECTLY.
Bootstrap. This capacitor is needed to drive the power switch’s gate above the supply
voltage. It is connected between SW and BST pins to form a floating supply across the
power switch driver.
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10
MP2619 – 2A, 24V INPUT, 600kHz 2-3CELL SWITCHING LI-ION BATTERY CHARGER
OPERATION
The MP2619 is a peak current mode controlled
switching charger for use with Li-Ion batteries.
Figure 1 shows the block diagram. At the
beginning of a cycle, M1 is off. The COMP
voltage is higher than the current sense result
from amplifier A1’s output and the PWM
comparator’s output is low. The rising edge of the
600 kHz CLK signal sets the RS Flip-Flop. Its
output turns on M1 thus connecting the SW pin
and inductor to the input supply.
The increasing inductor current is sensed and
amplified by the Current Sense Amplifier A1.
Ramp compensation is summed to the output of
A1 and compared to COMP by the PWM
comparator.
When the sum of A1’s output and the Slope
Compensation signal exceeds the COMP voltage,
the RS Flip-Flop is reset and M1 turns off. The
external switching diode D1 then conducts the
inductor current.
If the sum of A1’s output and the Slope
Compensation signal does not exceed the COMP
voltage, then the falling edge of the CLK resets
the Flip-Flop.
The MP2619 have one internal linear regulators
power internal circuit, VREF33. The output of
3.3V reference voltage can also power external
circuitry as long as the maximum current (30mA)
is not exceeded. A 1uF bypass capacitor is
required from VREF33 to GND to ensure stability.
Charge Cycle (Mode change: Trickle CC
CV)
The battery current is sensed via RS1 (Figure 1)
and amplified by A2. The charge will start in
“trickle charging mode” (10% of the RS1
programmed current ICC) until the battery voltage
reaches 3.0V/cell. If the charge stays in the
“trickle charging mode” till “timer out” condition
triggered, and the charge is terminated.
Otherwise, the output of A2 is then regulated to
the level set by RS1. The charger is operating at
“constant current charging mode.” The duty cycle
of the switcher is determined by the COMPI
voltage that is regulated by the amplifier GMI.
regulate the COMP pin, and then the duty cycle.
The charger will then operate in “constant voltage
mode.”
Automatic Recharge
After the battery has completely recharged, the
charger disables all blocks except the battery
voltage monitor to limit leakage current. If the
battery voltage falls below 4.0V/Cell, the chip will
begin recharging using soft-start. The timer will
then reset to avoid timer-related charging
disruptions.
Charger Status Indication
MP2619 has two open-drain status outputs:
CHGOK and ACOK . The ACOK pin pulls low
when an input voltage is greater than battery
voltage 300mV and over the under voltage
lockout threshold. CHGOK is used to indicate the
status of the charge cycle. Table 1 describes the
status of the charge cycle based on the
CHGOK and ACOK outputs.
Table 1―Charging Status Indication
ACOK
CHGOK Charger Status
low
low
low
high
high
high
In charging
End of charge, NTC
fault, timer out, thermal
shutdown, EN disable
PIN –VBATT
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