MAX16909

36V, 220kHz to 1MHz Step-Down Converter

with Low Operating Current

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General Description

The MAX16909 is a 3A, current-mode, step-down con-

verter with an integrated high-side switch. The device is

designed to operate with input voltages from 3.5V to 36V

while using only 30FA quiescent current at no load. The

switching frequency is adjustable from 220kHz to 1MHz

by an external resistor and can be synchronized to an

external clock. The output voltage is pin selectable to

be 5V fixed or adjustable from 1V to 10V. The wide input

voltage range along with its ability to operate at high duty

cycle during undervoltage transients make the device

ideal for automotive and industrial applications.

The device operates in skip mode for reduced current

consumption in light-load applications. Protection features

include overcurrent limit, overvoltage, and thermal shut-

down with automatic recovery. The device also features

a power-good monitor to ease power-supply sequencing.

The device operates over the -40NC to +125NC automo-

tive temperature range, and is available in 16-pin TSSOP

and TQFN (5mm x 5mm) packages with exposed pads.

Applications

Automotive

Industrial/Military

High-Voltage Input DC-DC Converter

Point-of-Load Applications

Features

S

Wide 3.5V to 36V Input Voltage Range

S

42V Input Transients Tolerance

S

High Duty Cycle During Undervoltage Transients

S

5V Fixed or 1V to 10V Adjustable Output Voltage

S

Integrated 3A Internal High-Side (70mI typ)

Switch

S

Fast Load-Transient Response and Current-Mode

Architecture

S

Adjustable Switching Frequency (220kHz to 1MHz)

S

Frequency Synchronization Input

S

30µA Standby Mode Operating Current

S

5µA Typical Shutdown Current

S

Overvoltage, Undervoltage, Overtemperature, and

Short-Circuit Protections

Typical Application Circuit

19-5777; Rev 0; 3/11

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part,

D1

100µF

4.7µF

47kI

10kI

65kI

L1

10µH

5V AT 3A

0.1µF

LX

BST

OUT

FB

PGOOD

FOSC

1µF

10pF

BIAS

2.7nF

COMP

FSYNC

EN

SUPSW

SUP

GND

47µF

POWER GOOD

MAX16909

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.