SOUTHCHIP SEMICONDUCTOR
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High Efficiency, Synchronous Boost Charger for Two/Three-cell Li-ion
Battery with Cell Balance Function
1
DESCRIPTION
2
•
•
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FEATURES
Integrated Synchronous Boost Charger
Cell Balance Function
Charging Management (Trickle Charge / Constant
Current Charge / Constant Voltage Charge / Charge
Termination)
The SC8922A is a highly integrated switch-mode boost
charger for 2/3 cells Li-ion battery applications. It is able to
step up 4.5V~5.5V input voltage to up to 16V, and provide
battery charge management functions including trickle charge,
constant current charge, constant voltage charge, charge
termination and charging status indication. Besides that, the
IC can also provide cell balance function, so to reduce the cell
voltage mismatch and increase the battery life time.
The SC8922A supports up to 3A charge current, and the user
can program the current freely through external resistor for
different applications.
The SC8922A supports input current limit, input under voltage
and over voltage protections, internal cycle by cycle current
limit, battery short circuit protection, and output over voltage
protection. It also offers charging safety timer, battery cell
temperature monitor and over temperature protection to
ensure safety under different abnormal conditions.
The SC8922A is available in 4x4 QFN-24 package.
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•
•
•
•
•
•
•
•
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Programmable Constant Charge Current
Programmable Constant Voltage
Charge Status Indication
Charge Safety Timer
NTC for Battery Protection
2A / 3A Input Current Limit Option
Adaptive Input Current Limit
Input Under Voltage and Over Voltage Protection
Battery Short Circuit Protection
Thermal Shutdown
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•
•
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APPLICATIONS
Blue tooth speaker charger
E-cigarette charger
E-joy charger
LI-ion battery charger
POS machine
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DEVICE INFORMATION
Part Number
SC8922AQDLR
Package
QFN-24
Dimension
4 mm x 4 mm x 0.75 mm
Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd.
SC8922A DATASHEET
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5
Typical Application Circuit
BT
VIN
SW
Q2
VSYS
VSYS
Supply for
MCU/LCD
Q1
VIN
Q3
VBAT
Supply for
Main Power
NTC
VBAT
+
VS3
L: auto termination, cell balance enabled
Float: auto termination, cell balance disabled
H: no limit
Float: 2A
L: 3A
MODE
VS2
IIN
PG
+
+
CSEL
ICHG
AGND PGND
VS1
Protection
board
Note:
1. Short VBAT to VS3 for 2 cells application
2. Logic high can be connected to 4.7Kohm pullup-resistor
from VIN
6
Selection Guide
VIN range
Max.
VBAT
Integrated
Power
Switch
Max. Charging
current
VINREG
Power path
management
NTC
Cell
Balance
Pin #
Part Number
SC8922
4.5V~5.5V
13.2V
Yes
3A
4.5V
Yes
Yes
Yes
24 pin QFN 4x4
SC8922A
4.5V~5.5V
13.2V
Yes
3A
4.5V
No
Yes
Yes
24 pin QFN 4x4
Note:
SC8922: Support supplement mode with power path function. 1. Only battery exists: Q3 is fully on, which means more quiescent current when
only battery exists; 2. System power can be obtained from VSYS pin. What’s more, battery will discharge by turning on Q3 fully to satisfy
system need when input source capacity is limited (please refer to
Supplement Mode).
SC8922A: No power path function. 1. Only battery exists: Q3 is always off, so IC works under low quiescent current condition; 2. System power
can be only obtained from VBAT pin. VSYS pin can’t afford system load and it must be connected with 22uF ceramic capacitor. 3. When VIN
plug in, Q3 is controlled by charger loop (linear mode in trickle charge; fully on in constant current charge or constant voltage charge), which is
same with SC8922.
Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd.
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7
Terminal Configurations and Functions
QFN Top View –SC8922A
VSYS
VSYS
VSYS
SW
SW
BT
VIN
MODE
CSEL
PGND
SW
SW
VBAT
VBAT
VBAT
VBATS
NC
VS3
VS2
ICHG
AGND
VS1
NTC
PG
I/O
SC8922A
3
1, 2,
23,24
4
NAME
BT
SW
VIN
IO
IO
I
IIN
DESCRIPTION
Bootstrap pin. Connect a 100nF ceramic capacitor between BT pin and SW pin to provide bias
voltage for internal driver circuit.
Switching node of the boost converter. Connect to external inductor.
Input of the boost charger
MODE selection pin
MODE = logic high: no termination, cell balance function is enabled.
MODE = logic low: auto-termination, cell balance function is enabled.
MODE = float: auto-termination, cell balance function is disabled.
Connect a resistor to GND to select the battery termination voltage target
Connect to the Negative Temperature Coefficient (NTC) thermistor inside the battery cells to
sense the battery cells temperature for protection. Short this pin to ground to disable this
function.
Charging status indication pin. Connect an LED from PG pin and GND pin. It is internally
pulled high to indicate the charge in process. When the battery is fully charged, it outputs high
impedance and the LED is off.
Set the input current limit.
IIN = logic high: no input current limit;
IIN = float: input current limit is set to 2A;
IIN = logic low: input current limit is set to 3A
Connect a resistor to GND to program the battery constant charging current.
Analog ground. Connect PGND and AGND together at the thermal pad under IC.
Cell voltage sense and cell balance path
Cell voltage sense and cell balance path
Cell voltage sense and cell balance path
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MODE
I
6
7
CSEL
NTC
I
I
8
PG
O
9
IIN
I
11
10
12
13
14
ICHG
AGND
VS1
VS2
VS3
I
IO
O
O
O
Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd.
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SC8922A DATASHEET
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15
16, 17,
18, 19
20, 21, 22
25
NC
VBAT
VSYS
PGND
O
O
IO
Output of the boost charger to charge the battery cells.
Output of the boost converter. This pin can provide power for the system operation.
Exposed thermal pad, Connect EP with power ground.
SOUTHCHIP CONFIDENTIAL
Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd.
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8
8.1
Specifications
Absolute Maximum Ratings
Over operating free-air temperature range (unless otherwise noted)
(1)
Min.
VIN, SW, VSYS
VS3, VBAT
Voltage
(2)
BT
MODE, CSEL, NTC, PG, IIN, ICHG
VS2, VS1
T
J
T
stg
(1)
(2)
Operating junction temperature
Storage temperature
-0.3
-0.3
-0.3
-0.3
-0.3
-40
-65
Max.
16
14
21
5.5
5
150
150
Unit
V
V
V
V
V
°
C
°
C
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device.
All voltages are with respect to network ground terminal.
8.2
θ
JA
θ
JC
(1)
Thermal Information
QFN-24 (4mmX4mm)
39
9
Unit
°
C/W
°
C/W
Junction to ambient thermal resistance
Junction to case resistance
Measured on JESD51-7, 4-layer PCB.
THERMAL RESISTANCE
(1)
8.3
ESD Ratings
Min.
Human-body Model (HBM)
(2)
All pins
-2
-750
Max.
2
750
Unit
kV
V
V
ESD(1)
Charged-device Model (CDM)
(3)
(1)
(2)
(3)
Electrostatic discharge (ESD) to measure device sensitivity and immunity to damage caused by assembly line electrostatic discharges
into the device.
Level listed above is the passing level per ANSI, ESDA, and JEDEC JS-001. JEDEC document JEP155 states that 500-V HBM allows
safe manufacturing with a standard ESD control process.
Level listed above is the passing level per EIA-JEDEC JESD22-C101. JEDEC document JEP157 states that 250-V CDM allows safe
manufacturing with a standard ESD control process.
8.4
Recommended Operation Conditions
Min.
V
IN
L
C
IN
C
VSYS
C
VBAT
VIN voltage range
Inductor
VIN capacitor
VSYS capacitor
VBAT capacitor
4.7
4.5
1
Typ.
5
2.2
10
10
Max.
5.5
3.3
Unit
V
µH
µF
µF
μF
Copyright © 2018, Southchip Semiconductor Technology (Shanghai) Co., Ltd.
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