8

1

2

4

5

SW

FB

EN

PGND

L1: 2.2 PH

10 PF

4.7 PF

LM3676

2.9V to 5.5V

MODE

3

6

NC

7

SGND

LM3676

www.ti.com

SNVS426C – NOVEMBER 2006 – REVISED MAY 2013

2-MHz 600-mA Step-Down DC-DC Converter With Mode Control

Check for Samples: LM3676

1

FEATURES

DESCRIPTION

The

LM3676

step-down

DC-DC

converter

is

2

•

16µA Typical Quiescent Current

optimized for powering low voltage circuits from a

•

600mA Maximum Load Capability

single Li-Ion cell battery and input voltage rails from

•

2MHz Typical PWM Fixed Switching Frequency

2.9V to 5.5V. It provides up to 600mA load current,

over the entire input voltage range. There are several

•

Automatic PFM/PWM Mode Switching or

different fixed voltage output options available as well

Forced PWM Mode

as an adjustable output voltage version.

•

Available in Fixed Output Voltages and

The LM3676 has a mode-control pin that allows the

Adjustable Version

user to select continuous Pulse Width Modulation

•

8-Lead Non-Pullback WSON Package

(PWM) mode over the complete load range or an

•

Internal Synchronous Rectification for High

intelligent PFM-PWM mode that changes modes

Efficiency

depending on the load. PWM mode offers superior

efficiency under high load conditions (>100mA) and

•

Internal Soft Start

the lowest output noise performance. In Auto mode,

•

0.01µA Typical Shutdown Current

PFM-PWM, hysteretic PFM extends the battery life

•

Operates From a Single Li-Ion Cell Battery

through reduction of the quiescent current to 16µA

(typ.) during light loads and system standby.

•

Only Three Tiny Surface-Mount External

Components Required (One Inductor, Two

The LM3676 is available in a 8-lead non-pullback

Ceramic Capacitors)

WSON package in leaded (PB) and lead-free (NO

PB) versions. A high switching frequency of 2 MHz

•

Current Overload and Thermal Shutdown

(typ) allows use of tiny surface-mount components,

Protection

an inductor and two ceramic capacitors.

APPLICATIONS

•

Mobile Phones

•

PDAs

•

MP3 Players

•

WLAN

•

Portable Instruments

•

Digital Still Cameras

•

Portable Hard Disk Drives

TYPICAL APPLICATION CIRCUITS

Figure 1. Typical Application Circuit

1

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.