NCP81042

http://onsemi.com

3

RF1

JP3

ETCH

1

2

CH1

Q3

1

RVFB1

RFB2

RSEN1

RNTC1

RISO1

RFB3

CF1

ENABLE

VCCP

RS4

VOUT

CSEN1

CFB2

RS3

LOUT1

Q4

1

VIN

CBOOT1

+ COUT1

VCC

R2

R1

NCP81042

BOOT 4

COMP

8

LG 2

LX 3

UG 5

CSP

13

CSN/VO

12

VCCP 1

PGOOD

6

SYNC

7

FBG

11

FB

9

SYNC

PGOOD

Figure 2. Typical Application Circuit

ABSOLUTE MAXIMUM RATINGS

Rating

Symbol

Unit

Controller Power Supply Voltages to GND

VCC, VCCP

15

−0.3

V

Boost Supply Voltage Input

BOOT

35V wrt/GND

40 V <100 ns

wrt/GND

15 wrt/LX

−0.3

V

High−Side Driver Output

(Top Gate)

UG

35

40 V ≤ 50 ns

wrt/GND

15 wrt/LX

−0.3 wrt/LX

−5 V < 200 ns

V

Switching Node

(Bootstrap Supply Return)

LX

35

40 < 100 ns

−5

−10 V < 200 ns

V

Low−Side Driver Output

(Bottom Gate)

LG

15

−0.3

−5 V < 200 ns

V

All Other Pins

6

−0.3, −1 V < 1 ms

V

PGOOD

PGOOD

7

−0.3, −1 V < 1 ms

V

SYNC

SYNC

7

−0.3, −1 V < 1 ms

V

Current Sense Amplifier

CSP, CSN/VO with

10

−0.3, −1 V < 1 ms

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.

*All signals referenced to GND unless noted otherwise.