ISL88731C
Functional Pin Descriptions(Continued)
PIN NUMBER SYMBOL
DESCRIPTION
20
21
LGATE
VDDP
Low-Side Power MOSFET Driver Output. Connect to low-side N channel MOSFET. LGATE drives
between VDDP and PGND. Range is -0.3V to 5.23V.
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. Range is 5.0V to 5.23V.
22
23
DCIN
Charger Bias Supply Input. Bypass DCIN with a 0.1µF capacitor to GND. Range 8V to +26V.
PHASE High-Side Power MOSFET Driver Source Connection. Connect to the source of the high-side
N-Channel MOSFET. Range -2V to +26V.
24
25
26
UGATE High-Side Power MOSFET Driver Output. Connect to the high-side N-channel MOSFET gate.
Range -2V to +33V.
BOOT
High-Side Power MOSFET Driver Power-Supply Connection. Connect a 0.1µF capacitor from
BOOT-to-PHASE. Range -2V to +33V.
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. Range 4V to 5.23V.
27
28
CSSN
CSSP
PD
Input Current-Sense Negative Input. Range 8V to 26V.
Input Current-Sense Positive Input. Range 8V to 26V.
Connect the backside paddle to GND. This pad has the lowest thermal resistance to the die. It should
be connected to a large area of ground with 3 to 5 vias for good thermal performance. The
recommended potential of the thermal pad is zero (0) Volts.
1, 5, 7, 14, 16
NC
No Connect. Pins are not connected internally.
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL88731CHRTZ
NOTES:
1. Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
88731C HRTZ
-10 to +100
28 Ld 5x5 TQFN
L28.5x5B
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach
materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both
SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL88731C. For more information on MSL please
see tech brief TB363.
FN6978.0
March 8, 2010
4
INTERSIL [ Intersil ]
