ISL88731A
PGND
Functional Pin Descriptions
Power Ground. Connect PGND to the source of the low side
MOSFET.
BOOT
High-Side Power MOSFET Driver Power-Supply
Connection. Connect a 0.1µF capacitor from BOOT to
PHASE.
VCC
Power input for internal analog circuits. Connect a 4.7Ω
resistor from VCC to VDDP and a 1µF ceramic capacitor
from VCC to ground.
UGATE
High-Side Power MOSFET Driver Output. Connect to the
high-side N-Channel MOSFET gate.
VDDP
Linear Regulator Output. VDDP is the output of the 5.2V
linear regulator supplied from DCIN. VDDP also directly
supplies the LGATE driver and the BOOT strap diode.
Bypass with a 1µF ceramic capacitor from VDDP to PGND.
LGATE
Low-Side Power MOSFET Driver Output. Connect to
low-side N-Channel MOSFET. LGATE drives between
VDDP and PGND.
ICOMP
PHASE
Compensation Point for the charging current and adapter
current regulation Loop. Connect 0.01µF to GND. See the
VCharge Current Control Loop section for details of
selecting the ICOMP capacitor.
High-Side Power MOSFET Driver Source Connection.
Connect to the source of the high-side N-Channel MOSFET.
CSOP
Charge Current-Sense Positive Input.
VCOMP
Compensation Point for the voltage regulation loop. Connect
4.7kΩ in series with 0.01µF to GND. See “VOLTAGE
CONTROL LOOP” on page 19 for details on selecting
VCOMP components.
CSON
Charge Current-Sense Negative Input.
CSSP
Input Current-Sense Positive Input.
VFB
CSSN
Feedback for the Battery Voltage.
Input Current-Sense Negative Input.
VDDSMB
DCIN
SMBus interface Supply Voltage Input. Bypass with a 0.1µF
capacitor to GND.
Charger Bias Supply Input. Bypass DCIN with a 0.1µF
capacitor to GND.
SDA
ACIN
SMBus Data I/O. Open-drain Output. Connect an external
pull-up resistor according to SMBus specifications.
AC-adapter Detection Input. Connect to a resistor divider
from the AC-adapter output.
SCL
ACOK
SMBus Clock Input. Connect an external pull-up resistor
according to SMBus specifications.
AC Detect Output. This open drain output is high impedance
when ACIN is greater than 3.2V. The ACOK output remains
low when the ISL88731A is powered down. Connect a 10k
pull-up resistor from ACOK to VDDSMB.
GND
Analog Ground. Connect directly to the backside paddle.
Connect to PGND close to the output capacitor.
ICM
Back Side Paddle
Input Current Monitor Output. ICM voltage equals
20 x (V
CSSP
Connect the backside paddle to GND.
- V ).
CSSN
NC
No Connect. Pins 1, 5, 7 and 14 are not connected.
FN6738.0
July 23, 2008
8
INTERSIL [ Intersil ]
