SGM41523/SGM41523A/B/C/D
Compact Switch, 2.5A Standalone
Single-Cell Battery Charger
with Safe and Reliable Charging
GENERAL DESCRIPTION
FEATURES
The SGM41523/SGM41523A/SGM41523B/SGM41523C/
● Maximum 2.5A Charging for 4.1V to 4.45V Battery
SGM41523D are compact switch standalone battery
● 1.33MHz Switch Frequency
chargers for single-cell Li-Ion or Li-polymer battery.
● Up to 95.7% Charge Efficiency
They
programmable
● 93% Charge Efficiency at 1.5A from 5V Input
maximum charge current, ordering selections of preset
● 91% Charge Efficiency at 1.5A from 9V Input
end of charge current and pre-charge current and
● Charging Voltage and Current Programmable
floating
● CC/CV Interface for Charge Current and Battery
are
featured
time
out.
with
The
resistor
SGM41523/SGM41523A/
SGM41523B/SGM41523C/SGM41523D
also
have
Voltage Settings
other safety features, such as over-voltage and
● 4.2V Input Voltage Regulation
over-current protections, fold-back retaining, input
● 4.2V to 12V Operating Input Voltage Range
under-voltage lockout, battery temperature monitoring
● Up to 18V Sustainable Voltage
and thermal shutdown. These features ensure safe and
● 13.5V Over-Voltage Protection with 100ns
reliable operation, ease of design and a comfortable
user experience.
The SGM41523/SGM41523A/SGM41523B/SGM41523C/
SGM41523D are available in a Green TDFN-3×3-12L
package. They operate over an ambient temperature
range of -40℃ to +85℃.
Turn-Off Timer
● Output Voltage Fold-Back Retaining
● Optional High or Low Charge Enable
Active Low (SGM41523/SGM41523A/SGM41523D)
Active High (SGM41523B/SGM41523C)
● JEITA Guideline Compliance
T2 Threshold 10℃
(SGM41523/SGM41523B/SGM41523D)
APPLICATIONS
T2 Threshold 15℃ (SGM41523A/SGM41523C)
Portable Audio Speaker
Charge Prohibited when > T3 (SGM41523D)
Mobile Phone
Wearables
● -40℃ to +85℃ Operating Temperature Range
● Available in a Green TDFN-3×3-12L Package
EPOS
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022 – REV. A. 1
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
PACKAGE/ORDERING INFORMATION
MODEL
PACKAGE
DESCRIPTION
SPECIFIED
TEMPERATURE
RANGE
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
SGM41523
TDFN-3×3-12L
-40℃ to +85℃
SGM41523YTDF12G/TR
SGM
41523DF
XXXXX
Tape and Reel, 4000
SGM41523A
TDFN-3×3-12L
-40℃ to +85℃
SGM41523AYTDF12G/TR
SGM
SGXDF
XXXXX
Tape and Reel, 4000
SGM41523B
TDFN-3×3-12L
-40℃ to +85℃
SGM41523BYTDF12G/TR
SGM
SGYDF
XXXXX
Tape and Reel, 4000
SGM41523C
TDFN-3×3-12L
-40℃ to +85℃
SGM41523CYTDF12G/TR
SGM
SGZDF
XXXXX
Tape and Reel, 4000
SGM41523D
TDFN-3×3-12L
-40℃ to +85℃
SGM41523DYTDF12G/TR
SGM
03HDF
XXXXX
Tape and Reel, 4000
MARKING INFORMATION
NOTE: XXXXX = Date Code, Trace Code and Vendor Code.
XXXXX
Vendor Code
Trace Code
Date Code - Year
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
DEVICE COMPARISON TABLE
Part No.
Charge Enable (CE)
T2 Threshold
Charge Range
SGM41523
Low
10℃
T1 ~ T4
SGM41523A
Low
15℃
T1 ~ T4
SGM41523B
High
10℃
T1 ~ T4
SGM41523C
High
15℃
T1 ~ T4
SGM41523D
Low
10℃
T1 ~ T3
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022
2
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
ABSOLUTE MAXIMUM RATINGS
Voltage Range (with Respect to GND)
VBUS (Converter Not Switching) ........................ -2V to 18V
BTST (Converter Not Switching) ...................... -0.3V to 18V
SW, BAT ............................................................. -2V to 14V
BTST to SW ....................................................... -0.3V to 6V
REGN, TS, CE (Converter Not Switching) ......... -0.3V to 6V
CC, CV, STAT.................................................... -0.3V to 6V
Output Sink Current
STAT ............................................................................. 6mA
Package Thermal Resistance
TDFN-3×3-12L, θJA .................................................. 52℃/W
Junction Temperature .................................................+150℃
Storage Temperature Range ........................ -65℃ to +150℃
Lead Temperature (Soldering, 10s) ............................+260℃
ESD Susceptibility
HBM ............................................................................. 2000V
CDM ............................................................................ 1000V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range, VVBUS .................................4.2V to 12V
Input Current (VBUS), IIN ..................................... 2.5A (MAX)
Output Current (SW), ISWOP.................................. 2.5A (MAX)
Battery Voltage, VBATOP ...................................... 4.45V (MAX)
Fast Charge Current, ICHGOP ................................ 2.5A (MAX)
Ambient Temperature Range.......................... -40℃ to +85℃
Junction Temperature Range ....................... -40℃ to +125℃
SG Micro Corp
www.sg-micro.com
OVERSTRESS CAUTION
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged if ESD protections are
not considered carefully. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions.
Failure to observe proper handling and installation procedures
can cause damage. ESD damage can range from subtle
performance degradation to complete device failure. Precision
integrated circuits may be more susceptible to damage
because even small parametric changes could cause the
device not to meet the published specifications.
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
SEPTEMBER 2022
3
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
PIN CONFIGURATION
(TOP VIEW)
VBUS
1
12
SW
CE
2
11
SW
CV
3
10
BTST
CC
4
9
REGN
NC
5
8
TS
STAT
6
7
BAT
GND
TDFN-3×3-12L
PIN DESCRIPTION
PIN
NAME
TYPE (1)
FUNCTION
1
VBUS
P
Charger Input and Voltage Sense. Connect a 10μF ceramic capacitor from VBUS pin to GND close to
device.
2
CE
DI
Charge Enable Input Pin. When this pin is driven low for SGM41523/SGM41523A/SGM41523D or
driven high for SGM41523B/SGM41523C, the battery charge is enabled.
3
CV
AI
Charge Voltage Programming Input Pin. Connect a resistor between this pin and GND, for feeding
different voltages to select 6 different charge voltages.
4
CC
AI
Charge Current Programming and Charging Inhibition Input Pin. Connect a resistor between this pin
and GND for programming the constant charge current by ICHGREG = K·VREF/RCC. Pull up this pin to a
voltage higher than VCC_H (1.4V) to stop charging.
5
NC
‒
No Connection.
6
STAT
DO
7
BAT
P
Battery Positive Terminal Pin. Use a 22μF capacitor between BAT and GND pins close to the device.
Push-Pull Charge Status Output. The STAT pin acts as follows:
During charge: low (LED1 ON, LED2 OFF).
Charge completed or charger in sleep mode: high (LED1 OFF, LED2 ON).
Charge suspended (in response to a fault): 0.65Hz, 50% duty cycle pulses (LEDs BLINKS).
8
TS
AI
Temperature Sense Input Pin. Connect to the battery NTC thermistor that is grounded on the other side.
To program operating temperature window, it can be biased by a resistor divider between REGN and
GND. Charge suspends if TS voltage goes out of the programmed range. It is recommended to use a
103AT-2 type thermistor.
If NTC feature is not used, connect the NTC pin to ground. The device checks for NTC grounded once
during start-up.
9
REGN
P
LDO Output that Powers LSFET Driver and Internal Circuits. Internally, the REGN pin is connected to
the anode of the bootstrap diode. Place a 1μF (10V rating) ceramic capacitor between REGN pin and
GND. It is recommended to place the capacitor close to the REGN pin.
10
BTST
P
High-side Driver Positive Supply. It is internally connected to the bootstrap diode cathode. Use a 10nF
ceramic capacitor from SW pin to BTST pin.
11,12
SW
P
Switching Node Output. Connect SW pin to the output inductor. Connect the 10nF bootstrap capacitor
from SW pin to BTST pin.
Exposed
Pad
GND
P
Thermal Pad and Ground Reference. It is the ground reference for the device and also the thermal pad
to conduct heat from the device (not suitable for high current return). Tie externally to the PCB ground
plane (GND). Thermal vias under the pad are needed to conduct the heat to the PCB ground planes.
NOTE:
1. AI = Analog Input, AO = Analog Output, AIO = Analog Input and Output, DI = Digital Input, DO = Digital Output, DIO = Digital
Input and Output, P = Power.
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022
4
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
ELECTRICAL CHARACTERISTICS
(VVBUS_UVLOZ < VVBUS < VVBUS_OV and VVBUS > VBAT + VSLEEP, TJ = -40℃ to +85℃, typical values are at TJ = +25℃, unless
otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
VBAT = 4.5V, VVBUS < VVBUS-UVLOZ or no VBUS
0.1
1.0
VBAT = 4.5V, VVBUS = 5V, fold-back mode
4.5
7.0
UNITS
Quiescent Currents
Battery Discharge Current (BAT)
Input Supply Current (VBUS)
IBAT
IVBUS
VVBUS = 5V, VVBUS > VBAT, converter not switching
1.4
VVBUS = 12V, VVBUS > VBAT, converter not switching
1.7
VBAT = 3.8V, VVBUS > VBAT, VVBUS > VVBUS_UVLOZ,
converter switching
2.2
µA
mA
8
BAT Pin and VBUS Pin Power-Up
VBUS Operating Range
VBUS for Device Active,
No Battery Sense VBUS Pin Voltage
Device Active Hysteresis
VVBUS_OP
VVBUS_UVLOZ
VVBUS rising
4.2
VVBUS_UVLOZ_HYS VVBUS falling from above VVBUS_UVLOZ
Sleep Mode Falling Threshold
VSLEEP
VVBUS - VBAT, VVBUSMIN ≤ VBAT ≤ VREGN, VVBUS falling,
TJ = +25℃
Sleep Mode Rising Threshold
VSLEEPZ
VVBUS - VBAT, VVBUSMIN ≤ VBAT ≤ VREGN, VVBUS rising,
TJ = +25℃
VBUS 13V Over-Voltage Rising
Threshold
VVBUS_OV_RISE
VVBUS rising
VBUS 13V Over-Voltage Hysteresis
VVBUS_OV_HYS
VVBUS falling
VVBUSMIN
VVBUS falling
Bad Adapter Detection Falling
Threshold
Bad Adapter Detection Hysteresis
Bad Adapter Detection Current
Source
Power Path Management
Total High-side MOSFET
On-Resistance - (Q1 + Q2)
Low-side Switching MOSFET
On-Resistance - Q3
3.32
VVBUS rising, TJ = +25℃
V
3.46
V
70
mV
80
165
mV
100
175
260
mV
12.78
13.4
13.90
V
355
3.52
VVBUSMIN_HYS
IBAD_SRC
13.2
3.70
mV
3.89
250
Sink current from VBUS to GND, TJ = +25℃
17
24
V
mV
30
mA
RON_HSFET
VREGN = 5V
140
mΩ
RON_LSFET
VREGN = 5V
100
mΩ
Charge Voltage Program Range
VBATREG_RANGE
TJ = +25℃
Charge Voltage Step
VBATREG_STEP
Battery Charger
Initial Charge Voltage Setting
Charge Current Regulation Range
VBATREG
4.10
RCV = 0Ω or floating TJ = +25℃
(4.2V)
TJ = -40℃ to +85℃
RCV = 22.1kΩ
(4.35V)
Initial Pre-Charge Current
Regulation Setting
SG Micro Corp
www.sg-micro.com
IPRECHG
4.188
4.200
4.212
4.171
4.200
4.229
4.334
4.347
4.361
TJ = -40℃ to +85℃
4.317
4.347
4.378
2500
mA
0.510
0.550
A
8.0
%
ICHGREG_RANGE
ICHGREG
0
VBAT = 3.8V
V
mV
TJ = +25℃
ICHGREG = 0.515A, TJ = +25℃
Initial Charge Current Regulation
Setting
4.45
50
ICHGREG = 1.235A, TJ = +25℃
0.475
-6.7
1.19
1.23
-3.6
V
1.28
A
3.5
%
ICHGREG = 1.535A, TJ = +25℃
1.480
1.535
1.580
A
ICHGREG = 1.535A,
TJ = -40℃ to +85℃
1.455
1.535
1.605
A
31
55
88
101
130
163
VBAT = 2.6V,
ICHGREG = 0.515A
TJ = +25℃, IPRECHG
ICHGREG = 1.235A
is 10% of ICHGREG
mA
SEPTEMBER 2022
5
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
ELECTRICAL CHARACTERISTICS (continued)
(VVBUS_UVLOZ < VVBUS < VVBUS_OV and VVBUS > VBAT + VSLEEP, TJ = -40℃ to +85℃, typical values are at TJ = +25℃, unless
otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2.68
2.79
2.91
V
Battery Charger
Battery LOW Falling Threshold
VBATLOW_FALL
ICHGREG = 600mA, TJ = +25℃
Battery LOW Rising Threshold
VBATLOW_RISE
Pre-charge to fast charge
Initial Termination Current
Regulation Setting
Initial Battery Short Voltage
Initial Battery Short Current
V
ICHGREG = 0.515A
21.5
51
80.5
ICHGREG = 1.235A
92.5
123
154
VBAT falling, TJ = +25℃
2.02
2.05
2.09
VBAT rising, TJ = +25℃
2.15
2.19
2.22
30
33.5
38
ITERM
VBAT = 4.1V, TJ = +25℃,
ITERM is 10% of ICHGREG
VSHORT
VSHORTZ
ISHORT
3.10
VBAT < VSHORTZ
mA
V
mA
Fold-Back Mode Threshold below
VBATREG
VFOLDBACK
Recharge Threshold below VBATREG
VRECHG
Charge Current Amplification Ratio
K
10300
VREF
1
V
4.16
V
Constant Current Control Reference
Voltage
Input Voltage Regulation
Input Voltage Regulation Limit
VINDPM
VBAT falling
90
85
VBAT falling, TJ = +25℃
LVDPM version
140
mV
190
mV
BAT Pin Over-Voltage Protection
Battery Over-Voltage Threshold
VBATOVP_RISE
VBATOVP_FALL
As percentage of VBATREG,
TJ = +25℃
VBAT rising
103
104.5
106
VBAT falling
101
102.5
104
%
Thermal Regulation and Thermal Shutdown
Junction Temperature Regulation
Threshold
Thermal Shutdown Rising
Temperature
Thermal Shutdown Hysteresis
TJUNCTION_REG
Temperature increasing
110
℃
TSHUT
Temperature increasing
150
℃
10
℃
TSHUT_HYS
JEITA Thermistor Comparator
VT1
Charger suspends if temperature T is below T1
(T < T1), as percentage to VREGN
73.2
%
VT1 Falling
As percentage of VREGN
71.3
%
T2 (10℃) Threshold Voltage
on TS Pin
68.1
%
VT2
Charge back to ICHGREG/10 and VBATREG - 100mV
if T1 < T VBAT + VSLEEP, TJ = -40℃ to +85℃, typical values are at TJ = +25℃, unless
otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Charge Over-Current Comparator (Cycle-by-Cycle)
HSFET Cycle-by-Cycle
IHSFET_OCP
Over-Current Threshold
Charge Under-Current Comparator (Cycle-by-Cycle)
LSFET Under-Current Falling
Threshold
PWM
VLSFET_UCP
PWM Switching Frequency
fSW
Maximum PWM Duty Cycle
DMAX
From sync mode to non-sync mode
Oscillator frequency, Buck mode, TJ = +25℃
1.20
4
A
100
mA
1.33
1.45
98
MHz
%
REGN LDO
REGN LDO Output Voltage
REGN LDO Maximum Output
Current
VREGN
IREGN_MAX
VVBUS = 9V, IREGN = 40mA
4.70
4.90
5.10
VVBUS = 5V, IREGN = 20mA
4.79
4.86
4.92
56
68
80
mA
0.2
V
VVBUS = 5V
V
Logic I/O Pin Characteristics (nCE)
Input Low Threshold
VIL
Input High Threshold
VIH
High-Level Leakage Current
IBIAS
0.8
Pull up rail 1.8V
V
0.1
µA
Logic I/O Pin Characteristics (STAT)
High-Level Output Voltage
VOH
Low-Level Output Voltage
VOL
Output or Sink Current Ability
ISTAT
4.6
V
0.3
3.3
V
mA
TIMING REQUIREMENTS
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VVBUS/VBAT Power-Up
VBUS OVP Reaction Time
100
ns
tBAD_SRC
42
ms
Deglitch Time for Charge
Termination
tTERM_DGL
168
ms
Deglitch Time for Recharge
tRECHG_DGL
168
ms
tBATOVP
1
µs
Wait Window for Bad Adapter
Detection
tACOV
VVBUS rising above ACOV threshold to turn off Q2
Battery Charger
Battery Over-Voltage Deglitch Time
to Disable Charge
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022
7
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
TYPICAL PERFORMANCE CHARACTERISTICS
VBAT = 4.2V, Inductor DCR = 5.5mΩ
96
Charge Efficiency (%)
Constant Charge Voltage Accuracy vs. Battery Voltage
Constant Charge Voltage Accuracy (%)
Charging Efficiency vs. Charge Current
98
94
92
90
88
86
84
VVBUS = 5V
VVBUS = 9V
VVBUS = 12V
82
80
0.1
0.4
0.7
1
1.3
1.6
1.9
2.2
2.5
2.8
0.4
0.2
VVBUS = 5V, Fast Charging Current = 2A
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
CV = 4.1V
CV = 4.2V
CV = 4.3V
CV = 4.35V
CV = 4.4V
CV = 4.45V
0.2
0.4
0.6
Charge Current (A)
Fast Charge Current (mA)
Constant Charge Voltage Accuracy (%)
CV = 4.4V, Fast Charging Current = 1.2A
1280
1260
1240
1220
1200
1180
1160
1140
VVBUS = 5V
VVBUS = 9V
VVBUS = 12V
1120
1100
3
3.2
3.4
3.6
3.8
4
4.2
4.4
0.4
Fast Charge Current (mA)
Constant Charge Voltage Accuracy (%)
CV = 4.4V, Fast Charging Current = 2A
2050
2025
2000
1975
1950
VVBUS = 5V
VVBUS = 9V
VVBUS = 12V
1925
1900
3
3.2
3.4
3.6
3.8
Battery Voltage (V)
SG Micro Corp
www.sg-micro.com
1.4
1.6
1.8
2
0.2
VVBUS = 9V, Fast Charging Current = 2A
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
CV = 4.1V
CV = 4.2V
CV = 4.3V
CV = 4.35V
CV = 4.4V
CV = 4.45V
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Charge Current (A)
Fast Charge Current vs. Battery Voltage
2075
1.2
Constant Charge Voltage Accuracy vs. Battery Voltage
Battery Voltage (V)
2100
1
Charge Current (A)
Fast Charge Current vs. Battery Voltage
1300
0.8
4
4.2
4.4
0.4
0.2
Constant Charge Voltage Accuracy vs. Battery Voltage
VVBUS = 12V, Fast Charging Current = 2A
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
CV = 4.1V
CV = 4.2V
CV = 4.3V
CV = 4.35V
CV = 4.4V
CV = 4.45V
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Charge Current (A)
SEPTEMBER 2022
8
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Charge Enabled
nCE
SW
IBAT
2A/div
2A/div
IBAT
STAT
5V/div
5V/div
SW
5V/div 2V/div
2V/div
nCE
VVBUS = 5V, 3.8V Battery, 2A Charge Disabled
5V/div
VVBUS = 5V, 3.8V Battery, 2A Charge Enabled
STAT
Charge Disabled
Time (500μs/div)
Time (20μs/div)
Power-Up with Charge Enabled
Power-Up with Charge Enabled
REGN
2V/div
SW
5V/div
VBAT
2A/div
IBAT
VBUS
5V/div
SW
VVBUS = 5V, No Battery, Charge Enabled
5V/div
VBUS
5V/div 5V/div
VVBUS = 5V, 3.8V Battery, 2A Charge Enabled
Time (20ms/div)
Time (50ms/div)
Power-Up with Charge Enabled
Power-Up with Charge Enabled
5V/div
REGN
SW
Time (20ms/div)
VBUS
REGN
SW
IBAT
VVBUS = 12V, 3.8V Battery,
2A Charge Enabled
2A/div
2A/div
IBAT
5V/div 5V/div 5V/div
5V/div
VBUS
SG Micro Corp
www.sg-micro.com
5V/div
VVBUS = 9V, 3.8V Battery, 2A Charge Enabled
Time (20ms/div)
SEPTEMBER 2022
9
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
TYPICAL APPLICATION CIRCUIT
4.2V to 12V
USB
L 1μH
VBUS
System Load
SW
CIN
10μF
COUT
22μF
CBTST
10nF
BTST
GPIO
CE
BAT
CV
GND
CC
RCV
SGM41523
SGM41523A/B/C/D
RCC
VREGN
REGN
VREGN
RST1
LED1
RT1
STAT
RST2
CREGN
1μF
ICHG = 2.5A
TS
RT2
LED2
Figure 1. Typical Application Circuit
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022
10
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
FUNCTIONAL BLOCK DIAGRAM
VBUS
RBFET (Q1)
REGN
LDO
Q1
Control
REGN
BTST
Voltage & Current
Sensing
&
DAC Reference
Protections:
OVP
UVP
OCP
UCP
OTP
HSFET (Q2)
Converter
Control
SW
REGN
LSFET (Q3)
GND
REGN
Digital
Control
BAT
STAT
BAT_OVP
Recharge
Termination
BATLOWV
BATSHORT
Fold-Back
CE
CC
CC/CV
Interface
JEITA
Control
Battery
Temperature
Sensing
TS
CV
SGM41523
SGM41523A/B/C/D
Figure 2. Block Diagram
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022
11
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
DETAILED DESCRIPTION
Overview
The
SGM41523/SGM41523A/SGM41523B/SGM41523C/
SGM41523D are highly-integrated 2.5A switch-mode standalone battery charge management devices for applications
such as cell phones, tablets and portable devices that use
single-cell Li-Ion and Li-polymer batteries. The devices have
a low impedance power path that improves the operation
efficiency of the switch-mode, reduces the battery charging
time and extends battery life in the discharging phase. The
charging setting with the CC/CV interface makes the device a
flexible solution. These devices include three main power
switches: input reverse blocking FET (RBFET, Q1), high-side
switching FET (HSFET, Q2) and low-side switching FET
(LSFET, Q3). The bootstrap diode of the high-side gate drive
is also integrated to simplify the system design.
The start and termination of a charging cycle can be
accomplished without software control. The sensed battery
voltage is used to decide the starting phase of charge in one
of the three phases of charge cycle: pre-conditioning,
constant current or constant voltage. When the charge
current falls below a preset limit and the battery voltage is
above recharge threshold, the charger function will
automatically terminate and end the charging cycle. When the
voltage of a charged battery is below the recharge threshold,
the charger starts another charging cycle.
The
SGM41523/SGM41523A/SGM41523B/SGM41523C/
SGM41523D have several safety features, such as
over-voltage
and
over-current
protections,
battery
temperature monitoring, input UVLO and thermal shutdown.
TS pin is connected to an NTC thermistor for battery
temperature monitoring and protection in charge mode
according to JEITA profile. This device also features thermal
regulation in which the charge current is reduced if the
junction temperature exceeds 110℃. The STAT output can
report the status of the charge and any fault conditions.
Power-On Reset (POR)
The internal circuit of the device is powered from the voltage
VVBUS. When the voltage of VBUS goes above its UVLO level
(VVBUS > VVBUS_UVLOZ), a POR happens and activates the
sleep comparator. Upon activation, the CC/CV interface will
also be ready for charge current and voltage settings.
Battery Charging Management
Battery Charging Profile
The
SGM41523/SGM41523A/SGM41523B/SGM41523C/
SGM41523D feature a full battery charging profile with five
phases. In the beginning of the cycle, the battery voltage
(VBAT) is tested and appropriate current and voltage regulation
levels are selected as shown in Table 1. Depending on the
detected status of the battery, the proper phase is selected to
start or for continuation of the charging cycle. The phases are
trickle charge (VBAT < 2.19V), pre-charge, fast-charge (constant
current and constant voltage) and fold-back mode.
Table 1. Charge Current Setting Based on VBAT
VBAT Voltage
Charge Current
< 2.19V
ISHORT
2.19V to 3V
IPRECHG
> 3V
ICHGREG
Regulation Voltage
VBATREG
Fold-Back Voltage
Charge Current
ICHGREG
Battery Voltage
Charge Current
VBATLOW (3V)
VSHORTZ (2.19V)
IPRECHG
ITERM
ISHORT
Trickle Charge Pre-charge
Fast Charge and Voltage Regulation
Fold-Back
Figure 3. Battery Charging Profile
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022
12
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
DETAILED DESCRIPTION (continued)
Charge Termination
A charge cycle is terminated when the battery voltage is
higher than the recharge threshold and the charge current
falls below the programmed termination current. The
termination current is programmed to ICHGREG/10 with a
minimum clamped value of 50mA (TYP). To fully charge a
battery, it is recommended to set the ICHGREG to be much
higher than 50mA. After the charging cycle is completed, the
converter enters fold-back mode.
The
SGM41523/SGM41523A/SGM41523B/SGM41523C/
SGM41523D have no battery switch but provide an
alternative way for battery safe and extended battery life,
which is the voltage fold-back mode when a battery is fully
charged while the input power is kept. This alternative has
less energy loss as no switch in the discharge loop. The only
penalty is that it could not support instant start if the battery
voltage is excessive low, in which condition it takes a few
more minutes for the load system to be ready for start. When
the device operates in FBM, the output voltage VFOLDBACK is
lower than VBATREG, and the output current limit is
ICHGREG_FOLDBACK (2.4A).
Compliance with JEITA Guideline
JEITA guideline (April 20, 2007 release) is implemented in the
device for safe charging of the Li-Ion battery. JEITA highlights
the considerations and limits that should be considered for
charging at cold or hot battery temperatures. High charge
current and voltage must be avoided outside normal
operating temperatures (typically 0 ℃ and 60 ℃ ). This
functionality can be disabled if not needed. Four temperature
levels are defined by JEITA from T1 (minimum) to T4
(maximum). Outside this range, charging should be stopped.
The corresponding voltages sensed by NTC are named VT1 to
VT4. Due to the sensor negative resistance, a higher
temperature results in a lower voltage on TS pin. The battery
cool range is between T1 and T2, and the warm range is
between T3 and T4. Charge must be limited in the cool and
warm ranges.
One of the conditions for starting a charge cycle is having the
TS voltage within VT1 to VT4 window limits. If during the
charge, battery gets too cold or too hot and TS voltage
exceeds the T1 - T4 limits, charging is suspended (zero
charge current) and the controller waits for the battery
temperature to come back within the T1 to T4 window.
SG Micro Corp
www.sg-micro.com
At cool temperature (T1 - T2) or at warm temperature (T3 T4), the charge current reduces to 10% of the charge current,
and the charge voltage is decreased by about 100mV
automatically. Particularly, the SGM41523D is charge
prohibited at warm temperature.
SGM41523
SGM41523A/B/C/D
BAT
REGN
22μF
1μF
RT1
TS
RT2
NTC
103AT-2
Figure 4. Battery Thermistor Connection and Bias Network
The resistor bias network (see Figure 4) can be calculated
based on the following equations:
RT2
1
1
−
RTHCOLD × RTHHOT ×
V
V
T4
T1
=
1
1
− 1 − RTHCOLD ×
− 1
RTHHOT ×
VT4
VT1
(1)
1
− 1
V
T1
RT1 =
1 1
+
RT2 RTHCOLD
(2)
where VT1 and VT4 are TCOLD and THOT threshold voltage on
TS pin as percentage to VREGN. Select TCOLD = 0℃ and THOT
= 60℃ for Li-Ion or Li-polymer batteries. For a 103AT-2 type
thermistor RTHCOLD = 27.28kΩ and RTHHOT = 3.02kΩ, the
calculation results are: RT1 = 5.18kΩ and RT2 = 29.34kΩ. The
standard value is 5.23kΩ for RT1 and 29.4kΩ for RT2.
Table 2. Temperature Related Charging Control
Temperature Range
Charge Current
Charge Voltage
Lower than T1
/
/
T1 - T2
ICHGREG × 10%
VBATREG - 100mV
T2 - T3
ICHGREG
VBATREG
T3 - T4
(SGM41523/SGM41523A/
SGM41523B/SGM41523C)
ICHGREG × 10%
VBATREG - 100mV
T3 - T4 (SGM41523D)
/
/
Higher than T4
/
/
SEPTEMBER 2022
13
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
DETAILED DESCRIPTION (continued)
Charging Status (STAT Pin)
Charging state is indicated with the push-pull STAT pin as
explained in Table 3. This pin is able to drive two LEDs (see
Figure 1).
Table 3. STAT Pin Function
Charging State
STAT Indicator
Charging battery (or recharge)
Low (LED1 ON, LED2 OFF)
Charging completed
High (LED1 OFF, LED2 ON)
When the device recovers and TJ falls below the hysteresis
band of TSHUT_HYS (10℃ under TSHUT), the converter resumes
automatically.
Battery Over-Voltage Protection
The over-voltage limit for the battery is 4.5% above the
battery regulation voltage setting. Charging will immediately
disable if a battery over-voltage occurs.
Battery Over-Discharge Protection
Charging is disabled or in sleep mode High (LED1 OFF, LED2 ON)
To recover from over-discharge, an input source is required at
VBUS pin. The battery is charged with ISHORT (33.5mA TYP)
when the VBAT < VSHORT, or with a pre-charge current when
the battery voltage is between VSHORT and VBATLOW.
Charge is suspended due to input
over-voltage, TS fault, or battery 0.65Hz Blinking
over-voltage
Protections Features
Input Over-Voltage
If VBUS voltage exceeds VVBUS_OV, switching will stop
immediately. Charger resumes its normal operation when the
voltage comes back below OVP limit.
Thermal Regulation and Thermal Shutdown
Internal junction temperature (TJ) is always monitored to
avoid overheating. A limit of +110 ℃ is considered for
maximum IC surface temperature in Buck mode and if TJ
intends to exceed this level, the device reduces the charge
current to keep maximum temperature limited to +110℃
(thermal regulation mode). As expected, the actual charging
current is usually lower than programmed value during
thermal regulation.
Charging Voltage Programming
Forcing a voltage on the CV pin, or grounding it with a resistor
that presents a similar voltage against the constant current
sourcing from the pin during charging selects 1 of 6 charging
voltages, as shown in Table 4.
Charge Current Programming and Turn-Off
Charge current is programmed by using different RCC
resistance or by providing voltage difference on the RCC by
forcing a voltage on the other end, which could be generated
by a DAC or PWM output.
Forcing the CC to a voltage higher than VCC_H (1.4V) turns the
device off.
If the junction temperature exceeds TSHUT (+150℃), thermal
shutdown protection arises in which the converter is turned
off.
Table 4. Conditions for Selecting a Charging Voltage
Charging Voltage (V)
Forcing Voltage (V)
Separation Thresholds (V)
Recommended Grounding Resistance (kΩ)
4.1
0.45
0.3 ~ 0.6
9.09
4.2
Grounding or Open
< 0.3 or > 2.0
Grounding or Floating
4.3
0.75
0.6 ~ 0.9
15
4.35
1.05
0.9 ~ 1.2
21
4.4
1.4
1.2 ~ 1.6
28
4.45
1.8
1.6 ~ 2.0
35.7
NOTE: Sourcing current out of the CV is typically 50μA.
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022
14
SGM41523
SGM41523A/B/C/D
Compact Switch, 2.5A Standalone Single-Cell
Battery Charger with Safe and Reliable Charging
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
SEPTEMBER 2022 ‒ REV.A to REV.A.1
Page
Updated Electrical Characteristics section ....................................................................................................................................................... 5, 6
Changes from Original (AUGUST 2022) to REV.A
Page
Changed from product preview to production data ............................................................................................................................................. All
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022
15
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TDFN-3×3-12L
D
e
N7
N12
D1
k
E1
E
N1
N6
b
L
BOTTOM VIEW
TOP VIEW
2.55
1.60
2.8
A
A1
0.6
A2
SIDE VIEW
0.2
0.45
RECOMMENDED LAND PATTERN (Unit: mm)
Symbol
Dimensions
In Millimeters
MIN
MAX
Dimensions
In Inches
MIN
MAX
A
0.700
0.800
0.028
0.031
A1
0.000
0.050
0.000
0.002
A2
0.203 REF
0.008 REF
D
2.924
3.076
0.115
0.121
D1
2.450
2.650
0.096
0.104
E
2.924
3.076
0.115
0.121
E1
1.500
1.700
0.059
k
b
0.200 MIN
0.150
e
L
0.250
0.006
0.476
0.013
0.450 TYP
0.324
0.067
0.008 MIN
0.010
0.018 TYP
0.019
NOTE: This drawing is subject to change without notice.
SG Micro Corp
www.sg-micro.com
TX00062.000
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
W
P0
Q1
Q2
Q1
Q2
Q1
Q2
Q3
Q4
Q3
Q4
Q3
Q4
B0
Reel Diameter
A0
P1
K0
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel
Diameter
Reel Width
W1
(mm)
A0
(mm)
B0
(mm)
K0
(mm)
P0
(mm)
P1
(mm)
P2
(mm)
W
(mm)
Pin1
Quadrant
TDFN-3×3-12L
13″
12.4
3.30
3.30
1.10
4.0
8.0
2.0
12.0
Q1
SG Micro Corp
www.sg-micro.com
TX10000.000
DD0001
Package Type
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Pizza/Carton
13″
386
280
370
5
SG Micro Corp
www.sg-micro.com
DD0002
Reel Type
TX20000.000
工商网监
湘ICP备2023018690号
