SGM41524B [SGMICRO]
Compact Switch Li+/Polymer Battery Charger with Safe and Reliable Charging;
| 型号： | SGM41524B |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Compact Switch Li+/Polymer Battery Charger with Safe and Reliable Charging 电池 |
| 文件： | 总16页 (文件大小：838K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM41524A/SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
GENERAL DESCRIPTION
FEATURES
The SGM41524A/SGM41524B is compact and efficient
Lithium-ion or Lithium-ion polymer (Li+/polymer) battery
charger. It can provide power and charge the single-cell
battery of a system typically found in compact portable
device. An internal switching buck converter regulates
the supply input for charging the battery and powering
the system even if the battery is absent. The converter
can also operate as a simple pass-through switch with
no switching if the load and input voltages are close.
● Constant-Current, Constant-Voltage (CC/CV)
Charging with Floating Time-Out Timer
● Constant-Current Pre-Charge
● Maximum 2.3A Charging for 4.2V to 4.45V Battery
● 1.34MHz Switching Frequency
● Programmable Charge Voltage and Current
● 4.15V Input Voltage Regulation
● Output Voltage Fold-Back Charge Retaining
● Temperature Related Charging Options (NTC
Function)
A typical application circuit is shown in Figure 2. The
SGM41524A/SGM41524B features resistor programmable
constant-current and constant-voltage charging capability
plus a charge limiting timer and operates in compliance
with the BAJ/JEITA safety guide. An NTC (β = 3950K)
can be used for battery temperature sensing on top of
the internal junction temperature monitoring. The IND
status output pin can be connected to LEDs to indicate
the operating conditions, such as power input ok (POK),
in charging (CHG), VIN over-voltage (POK and CHG
alternate blinking) and no power/disabled (OFF).
Voltage fold-back on the output is provided to power the
system from the input while retaining battery charge
and preventing overcharge. Input under-voltage
regulation is implemented by reducing the load current
such that VIN stays above a minimum when the source
is weak. Similarly, the die temperature can be regulated
and limited by reducing output power to avoid device or
the circuit board being overheated.
SGM41524A: 0℃ to 55℃
SGM41524B: 0℃ to 45℃
● Typical Peak Efficiency of 92% at 1.5A, VVIN = 5V
● -40℃ to +85℃ Operating Temperature Range
● Available in a Green TDFN-2×3-8BL Package
APPLICATIONS
Powering and Charge Control of Systems with 500mAh
to 6000mAh Li+/Polymer Batteries
These features simplify the system design and ensure
safe and reliable operation as well as improved user
experience.
The SGM41524A/SGM41524B is delivered in a Green
TDFN-2×3-8BL package. The device operates in -40℃
to +85℃ with +115℃ thermal regulation.
SG Micro Corp
MARCH 2021 – REV. A
www.sg-micro.com
SGM41524A
SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
RD2
XXXX
SGM41524A
SGM41524B
TDFN-2×3-8BL
TDFN-2×3-8BL
SGM41524AYTDC8G/TR
SGM41524BYTDC8G/TR
Tape and Reel, 3000
Tape and Reel, 3000
-40℃ to +85℃
-40℃ to +85℃
RD3
XXXX
MARKING INFORMATION
NOTE: XXXX = Date Code and Trace Code.
Serial Number
Y Y Y
X X X X
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.
OVERSTRESS CAUTION
ABSOLUTE MAXIMUM RATINGS
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.
Voltage Range (with Respect to GND)
V
VIN (VVBAT = 4V)..............................................................6V
VVBAT (VVIN Open).............................................................6V
Package Thermal Resistance
TDFN-2×3-8BL, θJA.................................................. 90℃/W
Junction Temperature.................................................+150℃
Storage Temperature Range.......................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
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.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete 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.
HBM, Any Pin to Ground and Power ...........................4000V
CDM ............................................................................1000V
Surge Test
Input Surge Discharge (1) .................................................11V
Input Over-Voltage Clamp ...................8V or 50mA, 24 hours
NOTE:
1. Peak current in IEC61000-4-5 1.2μs/50μs 2Ω waveform.
RECOMMENDED OPERATING CONDITIONS
Supply Voltage Range ........................................3.5V to 5.5V
Charge Current Setting Range ...........................0.3A to 2.3A
Operating Junction Temperature Range......-40℃ to +125℃
Ambient Temperature Range.........................-40℃ to +85℃
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
SG Micro Corp
www.sg-micro.com
MARCH 2021
2
SGM41524A
SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
PIN CONFIGURATION
(TOP VIEW)
SW
IND
CV
1
2
3
4
GND
VIN
8
7
6
5
EP
NTC
VBAT
CC
TDFN-2×3-8BL
PIN DESCRIPTION
PIN
1
NAME
SW
TYPE
O
FUNCTION
Buck Converter Switching Node. Connect to the output inductor.
Status Indication Output. It can source or sink constant-current when powered (charging or
not charging). It can only sink current if no power is applied.
2
IND
O
Charge Voltage Programming Input Pin. Connect a resistor between this pin and ground to
select one of the seven charging voltages.
3
4
5
CV
CC
I
I
I
Charge Current Programming/Charge-Inhibit Input Pin. Connect a resistor between this pin
and GND to program the constant charge current ICC, (RCCSET = K/ICC). Pull up this pin to a
voltage higher than VINH to inhibit and stop charging.
VBAT
Battery Voltage Sense Input.
NTC Temperature Sensing Input. Connect to an NTC thermistor (β = 3950K) with other
6
NTC
I
end grounded and biased to VIN by a 1.5 × RNTC25 resistor. Ground this pin if NTC is not
℃
used.
7
8
VIN
GND
EP
P
G
Power Input Pin.
Ground Reference Pin.
Exposed
Pad
Exposed Pad. Thermal pad is internally grounded and must be connected to the PCB GND
plane.
IC
NOTE:
I = Input, O = Output, G = Ground, P = Power for the Circuit, IC = Internal Connection.
SG Micro Corp
www.sg-micro.com
MARCH 2021
3
SGM41524A
SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
ELECTRICAL CHARACTERISTICS
(VVIN = 5V, VVBAT = 3.8V, TJ = -40℃ to +85℃, typical values are at TJ = +25℃, unless otherwise noted.)
PARAMETERS
SYMBOL
CONDITIONS
MIN
5.51
5.49
3.90
3.85
TYP
5.67
5.67
4.04
4.04
15
MAX
5.84
5.85
4.17
4.20
20
UNITS
TJ = +25℃
Over-Voltage Protection Threshold
VOVP
VBAT open, VVIN = 5V to 6V
VBAT open, VVIN = 5V to 4V
V
TJ = -40℃ to +85℃
TJ = +25℃
Minimum Input Operation Voltage
VIN Supply Current
VCHGm
V
TJ = -40℃ to +85℃
TJ = +25℃
IND open, fold-back mode,
RCV = 1kΩ, set VVBAT = 4.17V,
no switching
IQ
μA
μA
μA
15
21
TJ = -40℃ to +85℃
TJ = +25℃
0.1
1.4
Fold-back mode, RCV = 1kΩ,
ILKGFLD
set VVBAT = 4.17V, no switching
0.1
1.5
TJ = -40℃ to +85℃
TJ = +25℃
Leakage Current into the VBAT (1)
0.1
1.4
ILKG
VIN open, VVBAT = 3V to 4.45V
0.1
1.5
TJ = -40℃ to +85℃
Charge Loop
4.175
4.145
4.20
4.20
50
4.225
4.255
TJ = +25℃
Charge Output Regulation Voltage
Charge Voltage Step
VCHG
CV pin connected to GND
V
TJ = -40℃ to +85℃
VSTEP
mV
mV
TJ = -40℃ to +85℃
LDO charge mode, input voltage is greater than
VDROPm
2
20
40
The Minimum Voltage Drop between
VIN and VBAT Required for Switch
Charging
VCHGm, TJ = -40℃ to +85℃
Switch charge mode, input voltage is greater than
VDROPM
120
170
230
mV
mV
VCHGm, TJ = -40℃ to +85℃
Charge Voltage Fold-Back when
NTC Temperature is out of 10℃ to
45℃ Range
Compare with VCHG in 10℃ to 45℃ NTC
VDEG
50
temperature range
20
20
TJ = +25℃
Charge Current Decrease at NTC
Temperature Regulation (1)
As percentage of ICC in 10℃ to
45℃ NTC temperature range
IDEG
DT1
DT2
DT3
DT4
VFLT
FR
%
%
TJ = -40℃ to +85℃
TJ = +25℃
66
65
68
70
71
0℃ Threshold (1)
10℃ Threshold (1)
45℃ Threshold (1)
55℃ Threshold (1)
As percentage of VVIN
As percentage of VVIN
As percentage of VVIN
As percentage of VVIN
As percentage of VCHG
As percentage of VCHG
68
TJ = -40℃ to +85℃
TJ = +25℃
56
58
59
%
55
58
60
TJ = -40℃ to +85℃
TJ = +25℃
21
23
24
%
20
23
25
TJ = -40℃ to +85℃
TJ = +25℃
16
17
18
%
15
17
19
TJ = -40℃ to +85℃
TJ = +25℃
96.5
96.4
96.8
96.7
94.0
93.9
67
98.0
98.0
97.1
97.1
95.5
95.5
97
99.4
99.5
97.5
97.7
97.0
97.1
128
130
63
Floating Charge Timer Start
Threshold
%
TJ = -40℃ to +85℃
TJ = +25℃
Fold-Back Retaining Output Voltage
Recharge Threshold
%
TJ = -40℃ to +85℃
TJ = +25℃
VRR
As percentage of VCHG
VVIN = 5V,
%
TJ = -40℃ to +85℃
TJ = +25℃
Battery Pre-conditioning Charge
Current
IPRE
mA
%
V
VBAT < 60% × VCHG
65
97
TJ = -40℃ to +85℃
TJ = +25℃
57
60
Battery Pre-conditioning Threshold
Voltage
VPRE
As percentage of VCHG
56
60
65
TJ = -40℃ to +85℃
NOTE: 1. Parameters guaranteed by product characterization.
SG Micro Corp
www.sg-micro.com
MARCH 2021
4
SGM41524A
SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
ELECTRICAL CHARACTERISTICS (continued)
(VVIN = 5V, VVBAT = 3.8V, TJ = -40℃ to +85℃, typical values are at TJ = +25℃, unless otherwise noted.)
PARAMETERS
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
When power-up at
VVBAT < 60% × VCHG
Load Pre-Charge Current
ILOADPRECHG
300
mA
TJ = -40℃ to +85℃
4.23
4.05
9450
9150
5.00
5.00
5.77
ms
TJ = +25℃
Load Pre-Charge Period
tLOADPRECHG
5.83
TJ = -40℃ to +85℃
TJ = +25℃
10000 10500
10000 10800
1.5
Charge Current Setting Ratio
Charge Inhibition Voltage Threshold
Fast Charge Current
K
RCC = 10kΩ, K = ICC × RCCSET
V
V
A
TJ = -40℃ to +85℃
VINH
ICC
Voltage forcing on the CC pin to inhibit charging
0.945
0.915
95
1
1.050
1.080
175
TJ = +25℃
RCC = 10kΩ, VVBAT = 3.8V,
VIN = 5V
V
1
TJ = -40℃ to +85℃
TJ = +25℃
140
140
92
Charge Termination Current
Threshold
IRES
mA
min
V
85
190
TJ = -40℃ to +85℃
TJ = +25℃
77
107
Floating Charge Termination Time
tFCOT
74
92
108
TJ = -40℃ to +85℃
TJ = +25℃
4.00
3.98
4.15
4.15
115
155
20
4.30
4.32
VVBAT = 3.8V, VVIN for making
charge current to 0
Input Voltage Regulation Threshold
VINREG
TJ = -40℃ to +85℃
Thermal Regulation Threshold (1)
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
TOTR
TSHUT
℃
℃
℃
Temperature increasing
TSHUT_HYST
BAT Voltage Monitoring Period
before Turning into Fold-Back
Switch Operation
162
155
192
192
140
140
120
120
3.2
222
224
170
200
150
180
TJ = +25℃
tMON
ms
TJ = -40℃ to +85℃
TJ = +25℃
High-side Switch MOSFET
On-Resistance between VIN and
SW
RDS(ON)-H
mΩ
TJ = -40℃ to +85℃
TJ = +25℃
Low-side Switch MOSFET
On-Resistance between SW and
GND
RDS(ON)-L
IPEAK
fS
mΩ
A
TJ = -40℃ to +85℃
TJ = -40℃ to +85℃
TJ = +25℃
Peak Current Limit
1.13
1.08
1.34
1.34
1.55
1.56
PWM Switching Frequency
Indication Driving
MHz
TJ = -40℃ to +85℃
0.7
0.4
0.6
0.4
162
155
1.3
1.3
1.3
1.3
192
192
1.9
2.5
2.0
2.5
222
224
TJ = +25℃
IND Sink Current (1)
IINDSNK
IINDSRC
tBLINK
VVIN = 5V
mA
mA
ms
TJ = -40℃ to +85℃
TJ = +25℃
IND Source Current (1)
IND Blink Period
VVIN = 5V
TJ = -40℃ to +85℃
TJ = +25℃
Input OVP state
TJ = -40℃ to +85℃
NOTE: 1. Parameters guaranteed by product characterization.
SG Micro Corp
www.sg-micro.com
MARCH 2021
5
SGM41524A
SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
TYPICAL PERFORMANCE CHARACTERISTICS
VVIN = 5V, VVBAT = 3.8V, TJ = +25℃, unless otherwise noted.
DCM Mode Switch Waveform
CCM Mode Switch Waveform
VSW
VSW
IL
IL
Time (500ns/div)
Time (500ns/div)
Start-Up Charge by VVIN, with 3.7V Battery at BAT
Start-Up Charge by VVIN, with10Ω Resistor at BAT
VVBAT
VSW
VVBAT
VSW
IL
IL
VVIN
VVIN
Time (5ms/div)
Time (1ms/div)
Forcing CC = 2V to Disable Charge
Recovery Charge by Release CC
VVBAT
VSW
VVBAT
VSW
IL
IL
VCC
VCC
Time (50μs/div)
Time (20μs/div)
SG Micro Corp
MARCH 2021
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6
SGM41524A
SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VVIN = 5V, VVBAT = 3.8V, TJ = +25℃, unless otherwise noted.
Efficiency vs. Charge Current
Charge Current vs. RCC
98
96
94
92
90
88
86
84
2500
2000
1500
1000
500
0
0
500
1000 1500 2000 2500 3000
Charge Current (mA)
0
0.05
0.1
0.15
0.2
0.25
1/RCC (kΩ)
Battery Precondition Charging
Load Pre-Charge
Fast Charging with
Constant-Current
Voltage Fold-Back
Retaining
Charging for Constant-Voltage
VCHG
98% × VCHG
Floating Charging
Timer Starts
Fast Charge Current
Current
Voltage
Current Falls below the
Termination Level or
Floating Time-Out
CHG Indication Stops
60% × VCHG
Load Current
Curve with Less Load Current
Curve with More Load Current
Load Pre-Charge (~300mA)
RES (Termination Current)
I
IPRE (Precondition Charge Current)
Figure 1. Charging Voltage/Current Profile
SG Micro Corp
MARCH 2021
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7
SGM41524A
SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
TYPICAL APPLICATION
RCHG
CIN
RPOK
L 2.2μH
System
Load
SW
IND
CV
GND
VIN
1
2
3
4
8
7
6
5
BAT
COUT
5.5V
NTC
VBAT
RB
15kΩ
SGM41524A
SGM41524B
CC
RNTC
RCV
RCC
10kΩ (β = 3950K)
Figure 2. Typical Application Circuit
FUNCTIONAL BLOCK DIAGRAM
L
2.2μH
SGM41524A/SGM41524B
IND
SW
System
Load
2
D
1
5
GIS:1
RB
15kΩ
CS
TOTR
VBAT
BAJ/
JEITA
State
Machine
NTC
VIN
GM
6
7
RCHG
~5.5V Operation
RPOK
COUT
CC/CV Modulator
BAT
QR
QH
RCV
CV
CC
RNTC
10kΩ
3
4
CIN
QL
ICCI
(β = 3950K)
Reverse Block
GND
RCC
8
Figure 3. Block Diagram
ESSENTIAL SEQUENCE
VVIN Normal
VVIN Over-Voltage
VCHGhys
Charge Resumes
Stop Blinking
Start to Blink
VCHGm
Charge Starts
Load Pre-Charge
before Normal Charge
Charge Stops
IND Stops
VINDM
tON_D
Switching Stops for Over-Voltage
VCHGm
tNOR
tRET
Figure 4. Essential On/Off Timing
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SGM41524A
SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
FUNCTION DESCRIPTION AND APPLICATION
The SGM41524A/SGM41524B is
a
general purpose
when the input supply is present and charge is complete, the
output goes to the safe voltage fold-back mode for powering
the load. In this mode, the output current is limited to less
than peak current limit (IPEAK) and not to the programmed
charge current limit. Figure 5 shows the load transient
response of the evaluation board circuit whose charge current
is programmed for less than the load current.
stand-alone switch mode charger device designed for
powering systems using Li+/polymer rechargeable batteries.
Several features are provided including charge voltage and
current programming and status indication. Input voltage and
die temperature are constantly monitored to prevent output
power failure. If the input supply voltage drops too low, the
device reduces the output power to reduce loading on the
input and prevent further drop and power failure. Similarly, if
the junction is overheated by heavy load, the output power is
reduced to prevent thermal shutdown and system power
failure. It is also capable for various charging modes like
constant-current, constant-voltage, constant-current pre-
charging, and trickle charging (when input source is weak).
VVBAT
This device does not have a separate battery switch to
connect or disconnect the battery from the system (load).
However, it uses voltage fold-back retaining for battery safety
and lifetime extension when the battery is fully charged and
input power is present. With this method, battery energy loss
is lower because there is no switch in the discharge path. The
only disadvantage is that if the battery voltage is excessively
low, then start the system instantly is not possible because
charge path cannot be separated and it may take a few
minutes to charge the battery and reach to an adequate
voltage level to start the load system.
IBAT
Time (500μs/div)
Figure 5. Load Transient Response in Fold-Back Supply
The input voltage is monitored during charging. If the source
is weak and cannot maintain its voltage under heavy load, the
charging current is reduced to avoid system power collapse
due to input voltage drop.
The charge is considered full if the battery voltage exceeds
the floating charge timer start threshold (VFLT) and the charge
current drops below the charge termination current (IRES) or if
the floating charge timer runs out of time (tFCOT).
Power-Up with Low/No Battery
If the battery is not attached or its voltage is less than 60% of
VCHG (VVBAT < 0.6VCHG), the device feeds the VBAT with a
current limited to less than 300mA for about 5ms to
pre-charge the battery and system load before it goes into
battery pre-conditioning charging state. This pre-charge
period can increase the voltage of a 500μF capacitor
(between VBAT and GND) for up to 3V before the device
starts to deliver the lower pre-conditioning charge current
(97mA TYP).
When the full charge status is detected, the output will drop to
the fold-back voltage specified by fold-back retaining output
voltage ratio (FR ratio is typically 97.1% of VCHG as specified
in the EC table) and converter continues to work but indicator
shows "not charging". If the battery voltage is higher than
fold-back level, the switching will stop. VBAT is monitored
periodically and if it drops below that level the buck converter
starts to operate and regulate the output to the fold-back level.
The full charge state is continued until the input power is
recycled or if the battery voltage drops below the recharge
threshold (VRR).
If the load is started before fast charge phase, the supply
capacity will be limited to the pre-conditioning charge current
for a relatively long time. The initial 5ms pre-charge period
can quickly bring the device to the fast charge or even
fold-back phase when there is no battery attached and
provide enough power for the system operation in a short
time.
If the voltage drop between the input and output (VDROP) is
small and less than VDROPm, the device goes into forward
diode state and stops switching. Switching is resumed if the
VDROP exceeds VDROPM level. The CHG indication will turn off
if the time of VDROP < VDROPm is longer than the retaining time
(tRET).
Charging Profile and Fold-Back Retaining
The charging profile is shown in Figure 1. When the battery
voltage is less than 0.6VCHG, the output current is regulated to
a low and safe pre-conditioning level (IPRE). On the other hand
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SGM41524A
SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
FUNCTION DESCRIPTION AND APPLICATION (continued)
Table 2. SGM41524A Temperature Related Charging Control
Charge Current Programming and Turn-Off
Charge current is programmed by RCCSET resistance by
RCCSET = K/ICC where the K is charge current setting ratio
which is typically 10000V as specified in the EC table.
Charging
Voltage
Charging
Current
Temperature Range
Low range, < 0℃.
—
0
V
CHG - 50mV
VCHG
20% ICC
Low charging range, 0℃ to 10℃
Pulling the CC pin to a voltage level higher than VINH turns the
device off (disabled). When this pin is released the device
resumes the status before being inhibited.
Recommended charging range,
10℃ to 45℃
ICC
V
CHG - 50mV
20% ICC
0
High charging range, 45℃ to 55℃
High range, > 55℃
—
Charge Voltage Programming
Charging voltage can be programmed in one of the 7 preset
values by setting a voltage on CV pin. A 50μA current source
is internally connected to CV pin. Programming can be done
by directly applying a voltage to the CV pin, or by connecting
a resistor to GND that results in the same voltage as shown in
Table 1.
Table 3. SGM41524B Temperature Related Charging Control
Charging
Voltage
Charging
Current
Temperature Range
Low range, < 0℃.
—
0
V
CHG - 50mV
VCHG
20% ICC
Low charging range, 0℃ to 10℃
Recommended charging range,
10℃ to 45℃
ICC
0
Table 1. Conditions for Selecting a Charging Voltage
Charging
Voltage
(V)
Forcing
Voltage
(V)
Separation
Thresholds
(V)
Grounding
Resistance
(kΩ)
—
High range, > 45℃
NOTE: The VCHG and the ICC (charging voltage and current)
are selected in accordance with the battery's specification.
4.2
4.25
4.3
GND
0.6
1.0
1.4
1.8
2.2
< 0.4 or > 2.4 Short or Open
0.4 to 0.8
0.8 to 1.2
1.2 to 1.6
1.6 to 2.0
2.0 to 2.4
12
20
28
36
44
If NTC feature is not used, connect the NTC pin to ground.
The device checks for grounded NTC pin once during the
start-up when the input voltage is exceeding 2.7V.
4.35
4.4
4.45
Indication and Status Reading
The IND output can have 4 states to show different conditions:
(1) Low (sink current) to indicate the input power is available
(or not charging); (2) High (source current) to indicate the
device is in charging; (3) Hi-Z (open) for indicating no power
is available (when VVIN < VCHGm) or when it is turned off by
pulling the CC pin voltage up; and (4) blinking or alternatingly
Low and High (sinking and sourcing current) if an input
over-voltage occurs. IND voltage can be used as a signal for
the host or other circuit for status detection.
NOTE: Sourcing current out of the CV is 50μA typically.
BAJ/JEITA Charging Extending and Safety
This device implements the battery temperature related
charging control in compliance with the BAJ/JEITA guide on
safe use of secondary Lithium-ion batteries. An NTC (β =
3950K) can be used as shown in Figure 2 (or Figure 3) for
battery temperature sensing.
As specified in Table 2 and Table 3, the charging voltage and
current are reduced when the sensed battery temperature is
out of the preferred charging range (10℃ to 45℃). When the
temperature is too high (above 55℃ for SGM41524A and
above 45℃ for SGM41524B) or too low (less than 0℃), the
device stops charging.
Note that in the high impedance state (Hi-Z), the POK LED
and CHG LED are forward biased by the input voltage (all in
series) and they can turn on depending on the drive current
determined by the LED forward voltages and series
resistances.
SG Micro Corp
www.sg-micro.com
MARCH 2021
10
SGM41524A
SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
FUNCTION DESCRIPTION AND APPLICATION (continued)
Input Voltage Regulation and Thermal
Regulation
(3)
ICIN = ICHG × D× 1−D
(
)
To prevent power shutdown, the output current is gradually
Output Capacitor
reduced if VIN drops close to the minimum (VCHGm). Output
A few factors must be considered to design the output
capacitance. First, the SGM41524A/B has the internal loop
compensation for the buck converter that is optimized for
ceramic output capacitance larger than 10μF. The output
capacitor (COUT) circulates the output ripple current and
prevents it from going into the battery. Having AC current in
the battery results in extra heating and lower lifetime.
current eventually reaches to zero when VIN falls to VCHGm
level. Similarly, if the junction temperature increases close to
its maximum (TOTR), the output current is progressively
reduced and will reach to zero when the temperature reaches
to TOTR
.
Component Selection
Inductor Selection
Equation 4 gives the output capacitor RMS current ICOUT
when no battery is attached.
Small inductors and capacitors can be chosen thanks to the
high operating switching frequency of the 1.34MHz. Select an
inductor with a saturation current a little bit higher than the
charging current (ICHG) plus half the ripple current peak to
peak magnitude (IRIPPLE):
IRIPPLE
(4)
ICOUT
=
≈ 0.29×IRIPPLE
2× 3
The RMS ripple voltage in worst case is calculated as:
ISAT ≥ ICHG + (1/2) IRIPPLE
(1)
IRIPPLE
(5)
VRIPPLE
=
2× π × fS ×COUT
The inductor ripple current depends on the input voltage
(VVBUS), the duty cycle (D = VVBAT/VVBUS), the switching
frequency (fS) and the inductance (L). In CCM (e.g. full load):
The capacitance should be selected large enough for meeting
the system requirement for acceptable VRPPLE
.
In the system design, operation with no battery must be
considered carefully. Typically, the presence of the battery
helps in filtering of the sags and ripples and provides peak
energy demands when load surges occur. When the battery
is absent, a relatively large capacitor is needed to have
proper performance.
VVBUS ×D× 1−D
(
)
(2)
IRIPPLE
=
fS ×L
The maximum inductor ripple current occurs when the duty
cycle (D) is 0.5 or near. Typically, the inductor ripple is
designed in the range between 20% and 40% of the
maximum charging current as a trade-off between inductor
size and efficiency. Smaller inductor results in higher ripple
(AC) current flowing into the capacitor and switches and can
reduce efficiency.
Besides the VRIPPLE requirement, the load starting inrush
current is another factor to consider for output capacitor
selection. If at the beginning the device turns into fold-back,
the converter does not start switching as the output capacitor
holds the voltage higher than the fold-back retaining voltage.
VBAT voltage is monitored periodically and as long as it is
above fold-back voltage, it is only the output capacitor that
powers the system in the absence of the battery. The
capacitance should be large enough to maintain the VBAT
voltage and prevent dropping below minimum system
requirement before the switching fold-back mode supply
operation starts. The capacitance for fulfilling this requirement
is highly dependent on how the load starts, including its timing,
start current and acceptable voltage drop. Verification with a
prototype is recommended if operation without a battery is
considered.
Input Capacitor
Choose the input capacitance with enough RMS current
rating to decouple input switching AC currents away from
input. Low ESR ceramic capacitor such as X5R or X7R is
preferred for input decoupling. Typically, 10μF capacitance is
suitable for 1A to 2A charging current. Keep the capacitor(s)
close to VIN and GND pins to minimize the parasitic
inductance in the input ripple current circulation path. In the
worst-case, the RMS of the ripple current is half of the DC
charging current (ICHG) when duty cycle is D = 50%. If the
converter does not operate at 50% duty cycle, then the
worst-case occurs when duty cycle is closest to 50%. The
input RMS current (ICIN) can be estimated by Equation 3.
SG Micro Corp
www.sg-micro.com
MARCH 2021
11
SGM41524A
SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
FUNCTION DESCRIPTION AND APPLICATION (continued)
Layout Guide
1. Place VIN capacitor close to the VIN pin and GND pin.
3. Minimize the return loop area and ripple current path length
through the inductor and the output capacitor(s) to the device
GND pin.
2. Place the inductor terminal close to the SW pin and
minimize the copper area of switching node trace. Do not use
multiple layers for this connection.
4．Use copper plane for power GND and place multiple via
between top and bottom GND plane for better heat
dissipation and noise immunity.
PCB Layout Example
Top Layer
Bottom Layer
Top Solder
Via
L
BAT
CBAT
GND
SW
IND
CV
1
2
3
4
8
7
6
5
GND
VIN
CIN
VIN
LED LED
R = 15kΩ
NTC
VBAT
CC
TOP VIEW
RNTC
R = 3.3kΩ R = 3.3kΩ
Figure 6. Typical PCB Layout
SG Micro Corp
www.sg-micro.com
MARCH 2021
12
SGM41524A
SGM41524B
Compact Switch Li+/Polymer Battery Charger
with Safe and Reliable Charging
FUNCTION DESCRIPTION AND APPLICATION (continued)
R3
3.3kΩ
R4
3.3kΩ
C2
10μF
L 2.2μH
System
Load
SW
IND
CV
GND
VIN
1
2
3
4
8
7
6
5
VIN
5.5V
BAT
C1
10μF
SGM41524A
SGM41524B
NTC
VBAT
R5
15kΩ
CC
R1
R2
R6
0Ω
6.8kΩ
10kΩ (β = 3950K)
Figure 7. Typical Application Circuit, Programmed for Charge Current of ICC = 1.47A, and Voltage of VCHG = 4.20V
Table 4. Bill of Materials for Typical Application Circuit
Designator
U1
Quantity
Description
Size
Maker
Part Number
1
Switch Li+/Polymer Battery Charger
TDFN-2×3-8BL
SGMICRO SGM41524A/SGM41524B
Ind, 2.2μH, Irms = 4.3A, Isat = 6.1A,
DCR = 40mΩ
L1
1
4.0*4.0*2.0mm
Sunlord
WPN4020H2R2MT
C1, C2
R1
2
1
1
2
1
1
2
Cap, Cerm, 10μF, 10V, X5R
Res, 0Ω, 1%
0603
0603
0603
0603
0603
0603
0603
SAMSUNG
UniOhm
UniOhm
UniOhm
UniOhm
Sunlord
R2
Res, 6.8kΩ, 1%
R3, R4
R5
Res, 3.3kΩ, 5%
Res, 15kΩ, 1%
R6
NTC, 10kΩ, 1%, β = 3950K
Chip Light Emitting Diode, Blue
SDNT1608X103F3950FTF
FC-DA1608BK-470H10
LED1, LED2
Nationstar
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (MARCH 2021) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
MARCH 2021
13
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TDFN-2×3-8BL
D
e
N5
N8
L
k
E
E1
D1
N1
b
N4
BOTTOM VIEW
TOP VIEW
1.63
0.65
1.75
2.95
A
A1
A2
SIDE VIEW
0.25
0.50
RECOMMENDED LAND PATTERN (Unit: mm)
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
0.800
0.050
MIN
0.028
0.000
MAX
0.031
0.002
A
A1
A2
D
0.700
0.000
0.203 REF
0.008 REF
1.950
1.530
2.950
1.650
0.200
2.050
1.730
3.050
1.850
0.300
0.077
0.060
0.116
0.065
0.008
0.081
0.068
0.120
0.073
0.012
D1
E
E1
b
e
0.500 BSC
0.250 REF
0.020 BSC
0.010 REF
k
L
0.300
0.450
0.012
0.018
SG Micro Corp
www.sg-micro.com
TX00141.001
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
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 Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
TDFN-2×3-8BL
7″
9.5
2.30
3.30
1.10
4.0
4.0
2.0
8.0
Q2
SG Micro Corp
TX10000.000
www.sg-micro.com
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)
Reel Type
Pizza/Carton
7″ (Option)
7″
368
442
227
410
224
224
8
18
SG Micro Corp
www.sg-micro.com
TX20000.000
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