1

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FN6666.4

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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ISL62391, ISL62392

High-Efficiency, Triple-Output System

Power Supply Controller for Notebook

Computers

The ISL62391, ISL62392 controller generates 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 includes

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 and ISL62392 are identical except for how

their overvoltage protection is handled. The ISL62391

utilizes a tri-state overvoltage scheme, whereas the

ISL62392 employs a soft-crowbar method.

The ISL62391, ISL62392 is available in a 28 Ld 4x4 TQFN

package and operates 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

(28 LD 4X4 TQFN)

TOP VIEW

Ordering Information

PART

NUMBER

(Note)

PART

MARKING

TEMP

RANGE

(°C)

PACKAGE

(Pb-Free)

PKG.

DWG. #

ISL62391HRTZ

623 91HRTZ -10 to +100 28 Ld 4x4 TQFN L28.4x4

ISL62391HRTZ-T* 623 91HRTZ -10 to +100 28 Ld 4x4 TQFN L28.4x4

ISL62392HRTZ

623 92HRTZ -10 to +100 28 Ld 4x4 TQFN L28.4x4

ISL62392HRTZ-T* 623 92HRTZ -10 to +100 28 Ld 4x4 TQFN L28.4x4

ISL62391IRTZ

623 91IRTZ

-40 to +100 28 Ld 4x4 TQFN L28.4x4

ISL62391IRTZ-T*

623 91IRTZ

-40 to +100 28 Ld 4x4 TQFN L28.4x4

ISL62392IRTZ

623 92IRTZ

-40 to +100 28 Ld 4x4 TQFN L28.4x4

ISL62392IRTZ-T*

623 92IRTZ

-40 to +100 28 Ld 4x4 TQFN L28.4x4

*Please refer to TB347 for details on reel specifications.

NOTE: 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.

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

Data Sheet

December 22, 2008