1

ISL85410

The ISL85410 is a 1A Synchronous buck regulator with an

input range of 3V to 36V. It provides an easy to use, high

efficiency low BOM count solution for a variety of applications.

The ISL85410 integrates both high-side and low-side NMOS

FET's and features a PFM mode for improved efficiency at light

loads. This feature can be disabled if forced PWM mode is

desired. The part switches at a default frequency of 500kHz

but may also be programmed using an external resistor from

300kHz to 2MHz. The ISL85410 has the ability to utilize

internal or external compensation. By integrating both NMOS

devices and providing internal configuration options, minimal

external components are required, reducing BOM count and

complexity of design.

easy to implement design solution for a variety of applications

while giving superior performance. It will provide a very robust

design for high voltage Industrial applications as well as an

efficient solution for battery powered applications.

The part is available in a small Pb free 4mmx3mm DFN plastic

package with an operation temperature range of -40°C to

+125°C

Related Literature

•See AN1905, “ISL85410EVAL1Z, ISL85410AEVAL1Z,

ISL85418EVAL1Z Wide VIN 1A, 800mA Synchronous Buck

Regulator”

•See AN1908, “ISL85410DEMO1Z, ISL85418DEMO1Z Wide

VIN 1A, 800mA Synchronous Buck Regulator”

Features

• Wide input voltage range 3V to 36V

• Synchronous Operation for high efficiency

• No compensation required

• Integrated High-side and Low-side NMOS devices

• Selectable PFM or forced PWM mode at light loads

• Internal fixed (500kHz) or adjustable Switching frequency

300kHz to 2MHz

• Continuous output current up to 1A

• Internal or external Soft-start

• Minimal external components required

• Power-good and enable functions available.

Applications

• Industrial control

•Medical devices

•Portable instrumentation

• Distributed Power supplies

• Cloud Infrastructure

FIGURE 1. TYPICAL APPLICATION

GND

CBOOT

100nF

CFB

R3

R2

PHASE

SS

SYNC

BOOT

VIN

PGND

FS

COMP

FB

VCC

PG

EN

CVCC

1µF

CVIN

10µF

L1

22µH

COUT

10µF

1

2

3

4

5

6

9

10

11

12

INTERNAL DEFAULT PARAMETER SELECTION

COUT

10µF

VOUT

50

55

60

65

70

75

80

85

90

95

100

OUTPUT LOAD (A)

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

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

1-888-INTERSIL or 1-888-468-3774

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

All other trademarks mentioned are the property of their respective owners.

November 22, 2013

FN8375.2