FN6439 Rev 6.00

Page 1 of 9

July 19, 2012

FN6439

Rev 6.00

July 19, 2012

ISL97656

Step-Up Regulator with 4A Integrated Switch

DATASHEET

The ISL97656 is a high frequency, high efficiency current

mode control non-synchronous step-up voltage regulator

operated at constant PMW switching frequency. It has an

internal 4.0A, 120mΩ Low side MOSFET and can deliver high

output current and efficiency over 90%. The selectable 640kHz

and 1.22MHz switching frequency allows use of smaller

inductor and faster transient response. An external

compensation pin gives the user flexibility in setting frequency

compensation allowing the use of low ESR ceramic output

capacitors.

When in shut down mode, ISL97656 draws current <1µA and

can operate at as low as 2.2V input. These features along with

higher switching frequency allows use of tiny external

components and makes it an ideal device for portable

equipment and TFT-LCD displays.

The ISL97656 is available in a 10 Ld TDFN package with a

maximum height of 1.1mm. The device is specified for

operation over the full -40°C to +85°C temperature range.

Features

• +2.2V to +6.0V Operating Input Voltage Range

• +1.1*VIN to +24V Output Voltage Range

• 640kHz or 1.22MHz Switching Frequency

• Higher Efficiency and Better Thermal Performance

• Adjustable Soft-Start

• Internal Thermal Protection

• 0.8mm Maximum Height 10 Ld TDFN Package

• Pb-Free (RoHS Compliant)

•Halogen Free

Applications

• Portable Equipment, Digital Cameras

• TFT-LCD Displays, DSL Modems

• PCMCIA Cards, GSM/CDMA Phones

Pin Configuration

ISL97656

(10 LD TDFN)

TOP VIEW

Ordering Information

PART

NUMBER

(Notes 1, 2, 3)

PART

MARKING

PACKAGE

(Pb-Free)

PKG.

DWG. #

ISL97656IRTZ

656Z

10 Ld TDFN

L10.3x3B

NOTES:

1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details

on reel specifications.

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 ISL97656. For more information on MSL please see

techbrief TB363.

2

3

4

1

9

8

7

10

COMP

FB

EN

GND

SS

FREQ

VIN

LX

5

6

LX

GND

FIGURE 1. TYPICAL APPLICATION CIRCUIT

1

2

3

4

10

9

8

7

COMP

FB

EN

GND

SS

FREQ

VIN

LX

5 GND

6

LX

12V

2.2V TO 6V

INPUT

OUTPUT

D1

C2

22µF

C3

27nF

C4

0.1µF

C3

22µF

10µH

C5

4.7nF

R3

3.9k



R1 86.6k



R2

10k

