SI9731_09 VISHAY [Vishay Siliconix], SI9731_09 Datasheet - Page 7

• Manufacturer Part Number: SI9731_09
• Description: uP Controlled Battery Charger for 1-Cell Li-ion or 1-Cell to 3-Cell NiCd/NiMH Batteries
• Manufacturer: VISHAY [Vishay Siliconix]

BLOCK DIAGRAM AND TYPICAL APPLICATION CIRCUIT
Document Number: 71321
S09-2249-Rev. C, 26-Oct-09
CHARGERPOWER_ONIN
CHARGERPRESENTIN
TRICKLECHARGEEN
MAINCHARGEEN
V
CVMODE
CHARGER
ON/OFF
100 kΩ
2.2 μfd
C
IN
1
2
4
3
5
6
7
12.8 V
1 MΩ
2.6 V
Generator
+
–
–
+
+
–
Voltage
OVP
UVL
Latch
Charge
Trickle
2.6 V
3.4 V
5 V
12.8 V
Battery Min Voltage
Temp
Q2
Figure 1.
OK
Sensor
Temp
Circuit
Power
OK to Charge
(OTC)
Digital
Analog
E/A
Q1
+
N/C
–
+
–
+
8
Voltage
Fast
Charge
Ref
Battery Over
Voltage
Enable
–
+
3.4 V
5 V
10
N/C
1.3 V
RFB1
RFB2
RFB3
Q5
Q3
Q4
16
15
14
13
12
11
9
Vishay Siliconix
V
BAT+
CHARGERPRESENT
CHARGERPOWER_ON
2.2 μfd
4.1 V_TAP
GND
V
56 Ω
0.1 μfd
Trickle_V
C
REF
OUT
www.vishay.com
Si9731
BAT
B
a
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y
V
t
t
r
BAT
7