SILAN SA1412

SA1412
TWO CELL LI+ BATTERY PROTECTION CIRCUIT
DESCRIPTIONS
SA1412 protects for Lithium-Ion Batteries. When the Lithium-Ion
Batteries is in state of overcharge, overdischarge and overcurrent. The
IC turns off the external mosfet to protect the batteries.
FEATURES
* Overcharge consumption current(VCELL=4.5V ROC=270K ): 150µA
TSSOP-8-225-0.65
* Normal consumption current(VCELL=3.5V): 18µA
* Overcharge consumption current(VCELL=1.9V): 0.5µA
Overcharge consumption current(VCELL=1.0V): 0.1µA
APPLICATIONS
ORDERING INFORMATION
* Digital camer
* Digital vidicon
Device
* Special illumination
SA1412
* Portable DVD
Package
TSSOP-8-225-0.65
* PDA
* Interphone
* 7.2V large capacity battery.
PRODUCTS CATALOG
Overcharge
Part No.
Detection
Voltage
Overcharge
Detection
Hysteresis
Voltage
Overdischarge
Overdischarge
Overcurrent
Detection
Release
Detection
Voltage
Voltage
Voltage
SA1412A
4.350±0.025V
220±50mV
2.3±0.1V
3.5±0.2V
150±15mV
SA1412B
4.300±0.025V
220±50mV
2.3±0.1V
3.5±0.2V
150±15mV
SA1412C
4.250±0.025V
220±50mV
2.3±0.1V
3.5±0.2V
150±15mV
SA1412D
4.300±0.025V
200±50mV
2.5±0.1V
3.0±0.1V
75±15mV
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2007.09.28
Page 1 of 5
SA1412
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING
Characteristics
Symbol
Rating
Unit
Supply Voltage
VCC max
-0.3~18
V
CS Pin Voltage
VCSmax
-0.6~VCC
V
OC Pin Voltage
VOCmax
-0.6~VCC
V
Allowable Dissipation
Pd
300
mV
Storage Temperature Range
Tstg
-40~125
°C
Operating Temperature Range
Tamb
-20~70
°C
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, take SA1412B for instance, Tamb=25°C)
Characteristics
Overcharge Detection Voltage
Overcharge Detection Hysteresis
Voltage
Symbol
VOC
Test condition
Tamb=-20°C ~70°C;
VOC
Min.
Typ.
Max.
Unit
4.275
4.300
4.325
V
170
220
270
mV
2.20
2.30
2.40
V
Overdischarge Detection Voltage
VOD
Consumption Current 1
IVH1
VH=VL=1.0V, VCS=1.4V
--
--
0.1
µA
Consumption Current 2
IVH2
VH=VL =1.9V, VCS=3.2V
--
0.5
0.8
µA
Consumption Current 3
IVH3
VH=VL =3.5V
--
18.0
23.0
µA
Consumption Current 4
IVH4
VH=VL =4.5V,ROC=270 KΩ
--
150
--
µA
VL pin input Current
IVL
VH=VL =3.5V
-0.3
0
0.3
µA
Overdischarge Release Voltage
VDF
3.3
3.5
3.7
V
--
V
0.3
V
Discharge resume by
voltage rise
GD Pin H Output Voltage
VGDH
VH=VL =3.5V, IL=-10µA
GD Pin L Output Voltage
VGDL
VH=VL =3.5V, IL=10µA
VH-0.3 VH-0.2
--
0.2
(To be continued)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2007.09.28
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SA1412
(Continued)
Characteristics
Symbol
OC Pin Output Current
Min.
Typ.
Max.
Unit
30
150
--
µA
VCS1
135
150
165
mV
VCS2
0.35
0.45
0.55
V
IOCH
Overcurrent Detection Threshold
Value
Overcurrent Short Threshold Value
Test condition
VH=VL =4.5V
Load release: Load of 5MΩ or more between both battery
Overcurrent Release
pack pins
Overcurrent Detection Delay Time 1
TOC1
7
12
18
ms
Overcurrent Detection Delay Time 2
TOC2
--
30
100
µs
Tod
8
13
20
ms
Overdischarge Detection Delay
Time
Overcharge Detection Dead Time
Toch
CTC=0.18Uf
0.5
1.0
1.5
s
Start-Up Voltage
VST
VH=VL=2.5V
-0.24
-0.12
-0.04
V
PIN DESCRIPTIONS
PIN DESCRIPTION
Pin no.
Pin name
I/O
Description
1
OC
O
Overcharge detection output pin
2
GD
O
Discharge control FET (N-ch) control output pin
3
CS
I
Overcurrent detection input pin
4
GND
--
Ground pin, or lower cell load negative pole input pin.
5
TD
--
Overcharge detection dead time setting pin
6
VL
--
7
VCC
--
Power supply input pin
8
VH
--
Upper cell positive electrode input pin
Connection pin for lower cell positive electrode side and upper cell
negative electrode side.
FUNCTION DESCRIPTION
This IC is a lithium ion battery (2-cell in-series type) protection IC. It has functions below: Overcharge detection,
Overdischarge detection, Overcurrent detection. It controls the batteries charging or discharging by control the
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2007.09.28
Page 3 of 5
SA1412
external mosfet off and on. There are four opration modes as follows:
1. Overcharge mode:
The battery voltage of either the H or L cell goes above overcharge detection voltage. The IC shuts down the
charging loop.Detection operation delay for overcharge detection can be set with the dead time setting pin.
2. Normal mode
The battery voltage of both H and L cells is above overdischarge detection voltage and below overcharge
detection voltage.
3. Overdischarge mode
The battery voltage of either the H or L cell drops below overdischarge detection voltage. The IC shuts down
the discharging loop.Dead time for overdischarge detection is set internally.
4. Overcurrent mode
The voltage between CS-GND goes above overcurrent detection voltage during discharge. The IC shuts down
the discharging loop.
TEST CIRCUIT
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2
2007.09.28
Page 4 of 5
SA1412
TYPICAL APPLICATION CIRCUIT
Note:The circuit and parameters are reference only, please set the parameters of the real application circuit
based on the real test .
PACKAGE OUTLINE
TSSOP-8-225-0.65
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
UNIT: mm
REV:2.2
2007.09.28
Page 5 of 5