LM3677TLX-ADJ National Semiconductor Corporation, LM3677TLX-ADJ Datasheet

LM3677TLX-ADJ

Manufacturer Part Number

LM3677TLX-ADJ

Description

3mhz, 600ma Miniature Step-down Dc-dc Converter For Ultra Low Voltage Circuits

Manufacturer

National Semiconductor Corporation

Datasheet

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LM3677

3MHz, 600mA Miniature Step-Down DC-DC Converter for

Ultra Low Voltage Circuits

General Description

The LM3677 step-down DC-DC converter is optimized for

powering ultra-low voltage circuits from a single Li-Ion cell

battery and input voltage rails from 2.7V to 5.5V. It provides

up to 600mA load current, over the entire input voltage range.

The LM3677 is configured to different fixed voltage output

options as well as an adjustable output voltage version range

from 1.2V to 3.3V.

The device offers superior features and performance for mo-

bile phones and similar portable applications with complex

power management systems. Automatic intelligent switching

between PWM low-noise and PFM low-current mode offers

improved system control. During PWM mode operation, the

device operates at a fixed-frequency of 3 MHz (typ). PWM

mode drives loads from ~ 80mA to 600mA max. Hysteretic

PFM mode extends the battery life by reducing the quiescent

current to 16 µA (typ) during light load and standby operation.

Internal synchronous rectification provides high efficiency. In

shutdown mode (Enable pin pulled down), the device turns

off and reduces battery consumption to 0.01 µA (typ).

The LM3677 is available in a lead-free (NO PB) 5-bump micro

SMD package. A switching frequency of 3 MHz (typ) allows

use of tiny surface-mount components. Only three external

surface-mount components, an inductor and two ceramic ca-

pacitors, are required.

Typical Application Circuit

FIGURE 1. Typical Application Circuit

300084

30008401

Features

■

Applications

■

16 µA typical quiescent current

600 mA maximum load capability

3 MHz PWM fixed switching frequency (typ)

Automatic PFM/PWM mode switching

Available in 5-bump micro SMD package

Internal synchronous rectification for high efficiency

Internal soft start

0.01 µA typical shutdown current

Operates from a single Li-Ion cell battery

Only three tiny surface-mount external components

required (solution size less than 20 mm

Current overload and Thermal shutdown protection

Mobile phones

PDAs

MP3 players

W-LAN

Portable Instruments

Digital still cameras

Portable Hard disk drives

Efficiency vs. Output Current

OUT

= 1.8V)

)

www.national.com

October 2007

30008487

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