SA45141 Datasheet, PDF (5/9 Pages) Silan Microelectronics Joint-stock – THREE OR FOUR-CELL LI+ BATTERY PROTECTION CIRCUIT

Pin no. Pin name
I/O
Description
13
CON
Discharge FET ON/OFF pin
I
CON=low: DCHG=low, normal ; CON=high: DCHG=high, discharge
14
NC
15
V1
16
V2
17
V3
18
V4
19
NC
20
VCC
prohibited
--
Not connected
I
V1 cell positive electrode side ,V2 cell negative electrode side
I
V2 cell positive electrode side ,V3 cell negative electrode side
I
V3 cell positive electrode side ,V4 cell negative electrode side
I
V4cell positive electrode side
--
Not connected
--
Power supply input pin
FUNCTION DESCRIPTION
This IC is a lithium-ion batteries (3-cell or 4-cell) protection IC. It has functions below: Overcharge detection,
Overdischarge detection, Overcurrent detection. It controls the batteries charging or discharging by control the
external MOSFET off and on.
1. Overcharge mode
The battery voltage of either 3 cell batteries or 4 cell batteries goes above overcharge detection voltage. The
IC shuts down the charging loop. Dead time can be set by connecting a capacitor.
2. Normal mode
When the battery voltage of both 3 cell batteries and 4 cell batteries are above overdischarge detection voltage
and below overcharge detection voltage, it can realize the normal charging and discharging function.
3. Overdischarge mode
The battery voltage of either 3 cell batteries or 4 cell batteries drops below overdischarge detection voltage.
The IC shuts down the discharging loop. Dead time of overdischarge detection can be set by connecting a
capacitor.
4. Overcurrent mode
The voltage between CS-Vcc goes above overcurrent detection voltage during discharge. The IC shuts down
the discharging loop.
5. Discharge FET ON/OFF pin CON
CON=low: DCHG=low, normal; CON=high: DCHG=high, discharge prohibited.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.5 2009.06.05
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