isl88731c Intersil Corporation, isl88731c Datasheet - Page 3

• Manufacturer Part Number: isl88731c
• Description: Smbus Level 2 Battery Charger
• Manufacturer: Intersil Corporation

Functional Pin Descriptions
Pin Configuration
PIN NUMBER
10
11
12
13
15
17
18
19
2
3
4
6
8
9
SYMBOL
VDDSMB SMBus interface Supply Voltage Input. Bypass with a 0.1µF capacitor to GND. Range 3.3V to 5.5V.
VCOMP
ICOMP
CSON
PGND
ACOK
CSOP
ACIN
VREF
GND
SDA
ICM
SCL
VFB
AC Adapter Detection Input. Connect to a resistor divider from the AC adapter output. Range zero to
5.5V.
Reference Voltage output. Range 3.168V to 3.232V.
Compensation Point for the charging current and adapter current regulation Loop. Connect 0.01µF
to GND. See “Voltage Control Loop” on page 21 for details on selecting the ICOMP capacitor. Range
zero to 5.5V.
Compensation Point for the voltage regulation loop. Connect 4.7kΩ in series with 0.01µF to GND.
See “Voltage Control Loop” on page 21 for details on selecting VCOMP components. Range zero to
5.5V.
Input Current Monitor Output. ICM voltage equals 20 x (V
SMBus Data I/O. Open-drain Output. Connect an external pull-up resistor according to SMBus
specifications. Range zero to 5.5V.
SMBus Clock Input. Connect an external pull-up resistor according to SMBus specifications.
Range zero to 5.5V.
Analog Ground. Connect directly to the backside paddle. Connect to the backside paddle and PGND
at one point close to (under) the IC.
AC Detect Output. This open drain output is high impedance when ACIN is greater than 3.2V. The ACOK
output remains low when the ISL88731C is powered down. Connect a 10k pull-up resistor from ACOK
to VDDSMB. Range 3.3V to 5.5V.
Feedback for the Battery Voltage. Range 1V to 19V.
Charge Current-Sense Negative Input. Range 1V to 19V.
Charge Current-Sense Positive Input. Range 1V to 19V.
Power Ground. Connect PGND to the source of the low side MOSFET and the negative side of capacitors
to the charger output and the drain of the upper switching FET. Connect this area to the Backside paddle
at one location very near (under) the IC.
3
VCOMP
ICOMP
ACIN
VREF
NC
NC
NC
1
2
3
4
5
6
7
28
8
27
ISL88731C
9
(28 LD TQFN)
ISL88731C
10
26
TOP VIEW
11
PD
25
12
24
DESCRIPTION
13
23
14
22
21
20
19
18
17
16
15
VDDP
LGATE
PGND
CSOP
CSON
NC
VFB
CSSP
- V
CSSN
). Range zero to 3V.
September 9, 2010
FN6978.1