SI9731 Datasheet, PDF (4/10 Pages) Vishay Siliconix – UP Controlled Battery Charger For 1-Cell Li-ion or 1-Cell to 3-Cell NiCd/NiMH Batteries

Si9731
Vishay Siliconix
PIN CONFIGURATION
CHARGERPRESENTIN
CHARGERPOWER_ONIN
V_CHARGER
ON/OFF
TRICKLECHARGEEN
CVMODE
MAINCHARGEEN
(N/C)
TSSOP-16
1
16
2
15
3
14
4
13
Si9731DQ
5
12
6
11
7
10
8
9
Top View
CHARGERPRESENT = (XCHARGERPRESENT)
CHARGERPOWER_ON = (XCHARGERPOWER_ON)
V_BAT+
TRICKLE_V_BAT
4.1 V_TAP
GND
(N/C)
V_REF
ORDERING INFORMATION
Part Number
Si9731DQ
Eval Kit
Si9731DB
Temperature Range
- 40 to 85 °C
Temperature Range
- 40 to 85 °C
Package
Tape and Reel
Board Type
Surface Mount
PIN DESCRIPTION
Pin Number
Name
Function
1
CHARGERPRESENTIN Logic input for CHARGERPRESENT output
2
CHARGERPOWER_ONIN Logic input for CHARGERPOWER_ON output
3
V_CHARGER
External charger
4
ON/OFF
Master shutdown pin. Taking ON/OFF low shuts down the charger and quiescent current drops
to under 1 µA
5
TRICKLECHARGEEN Taking this pin high disables trickle (slow) charging
6
CVMODE
A logic high enables the error amplifier to linearly drive the gate of MOSFET Q1 when
MAINCHARGEREN is high.
7
MAINCHARGEEN
An external PWM signal at MAINCHARGEREN pin controls the ON/OFF duty cycle of the Fast
Charge MOSFET, Q1.
8, 10
N/C
Do not connect external circuitry to this pin. Circuitry internal to the IC is connected to this pin.
9
V_REF
Internal 1.30 V precision bandgap reference voltage. Do not apply loads to this pin.
11
GND
Low impedance system ground
12
4.1 V_TAP
Connect this pin to V_BAT+ for 4.1 V charge termination in constant voltage mode
13
TRICKLE_V_BAT
Resistor connected between this pin and V_BAT to limit the trickle charge current.
14
V_BAT+
Charger output connected to battery’s positive terminal
15
CHARGERPOWER_ON Open drain logic output
16
CHARGERPRESENT Open drain logic output
www.vishay.com
4
Document Number: 71321
S-60869-Rev. B, 22-May-06