FN6666 Rev 8.00

Page 1 of 22

August 25, 2015

FN6666

Rev 8.00

August 25, 2015

ISL62391, ISL62392, ISL62391C, ISL62392C

High-Efficiency, Triple-Output System Power Supply Controller for Notebook

Computers

DATASHEET

The ISL62391, ISL62392, ISL62391C and ISL62392C

controller generate supply voltages for battery-powered

systems. It includes two pulse-width modulation (PWM)

controllers, adjustable from 0.6V to 5.5V, and a linear

regulator (LDO3) that generates a fixed 3.3V and can deliver

up to 100mA. The ISL62391, ISL62392, ISL62391C and

ISL62392C include on-board power-up sequencing, a

power-good (PGOOD) output, digital soft-start, and internal

soft-stop output discharge that prevents negative voltages on

shutdown.

system with fast response to load transients. Light-load

efficiency is improved with period-stretching discontinuous

conduction mode (DCM) operation. To eliminate noise in audio

frequency applications, an ultrasonic DCM mode is included,

which limits the minimum switching frequency to 28kHz.

The ISL62391, ISL62391C and ISL62392, ISL62392C are

identical except for how their overvoltage protection is

handled. The ISL62391 and ISL62391C utilize a tri-state

overvoltage scheme, whereas the ISL62392 and ISL62392C

employ a soft-crowbar method.

The ISL62391, ISL62392, ISL62391C and ISL62392C are

available in a 28 Ld 4x4 TQFN package and operate over

the extended temperature range (-40°C to +100°C).

Features

• Fast Transient Response

• ±1% Output Voltage Accuracy

• 2 Fully Programmable Switch-Mode Power Supplies

• Programmable Switching Frequency

• Fixed 3.3V LDO Output

• Internal Soft-Start and Soft-Stop Output Discharge

• Wide Input Voltage Range: 5.5V to 25V

• Full and Ultrasonic Pulse-Skipping Mode

• Power-Good Indicator

• Overvoltage, Undervoltage and Overcurrent Protection

• Thermal Monitor and Protection

• Pb-Free (RoHS Compliant)

Applications

• Notebook and Sub-Notebook Computers

• PDAs and Mobile Communication Devices

• 3-Cell and 4-Cell Li+ Battery-Powered Devices

Pinout

ISL62391, ISL62392, ISL62391C, ISL62392C

(28 LD 4X4 TQFN)

TOP VIEW

PGOOD

FSET2

FCCM

VCC

LDO3EN

FSET1

FB1

BOOT2

LGATE2

PGND

PVCC

VIN

LDO3

LGATE1

1

2

3

4

5

6

7

21

20

19

18

17

16

15

28

27

26

25

24

23

22

8

9

10

11

12

13

14

CENTER PAD:

GND