NCP81081
http://onsemi.com
3
Table 1. PIN FUNCTION DESCRIPTION
Pin No. Pin Name Description
1 ZCD_EN# Enable Zero Current Detection
2 VCIN Control Input Voltage
3, 8 NC No Connect
4 BOOT Bootstrap Voltage
5, 37, FLAG 41 CGND Control Signal Ground
6 GH High Side FET Gate Access
7 PHASE Provides a return path for the high side driver of the internal IC. Place a high frequency ceram-
ic capacitor of 0.1 uF to 1.0 uF from this pin to BOOT pin.
9−14, FLAG 42 VIN Input Voltage
15, 29−35,
FLAG 43
VSWH Switch Node Output
16−28 PGND Power Ground
36 GL Low Side FET Gate Access
38 THWN Thermal Warning
39 DISB# Output Disable Pin
40 PWM PWM Drive Logic
Table 2. ABSOLUTE MAXIMUM RATINGS
Pin Symbol Pin Name Min Max
VCIN Control Input Voltage −0.3 V 7 V
VIN Power Input Voltage −0.3 V 30 V
BOOT Bootstrap Voltage −0.3 V wrt/VSWH 35 V wrt/PGND
40 V < 50 ns wrt/PGND
7 V wrt/VSWH
VSWH Switch Node Output −0.3 V 30 V
ZCD_EN# Zero Current Detection −0.3 V 6.5 V
PWM PWM Drive Logic −0.3 V 6.5 V
DISB# Output Disable −0.3 V 6.5 V
THWN Thermal Warning −0.3 V 6.5 V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 3. THERMAL CHARACTERISTICS
Rating Symbol Value Unit
Thermal Resistance, High−Side FET
R
Q
JPCB
13 °C/W
Thermal Resistance, Low−Side FET
R
Q
JPCB
5 °C/W
Operating Junction Temperature T
J
0 to 150 °C
Storage Temperature T
S
−55 to 150 °C
Moisture Sensitivity Level MSL 3
Table 4. OPERATING RANGES
Rating Symbol Min Typ Max Unit
Control Input Voltage VCIN 4.5 5 5.5 V
Input Voltage VIN 4.5 12 25 V
