LM3671MF-ADJ+ National Semiconductor, LM3671MF-ADJ+ Datasheet

LM3671MF-ADJ+

Manufacturer Part Number

LM3671MF-ADJ+

Description

Manufacturer

National Semiconductor

Datasheets

1.LM3671TLX-3.3.pdf (24 pages)

2.LM3671MF-ADJ.pdf (23 pages)

Specifications of LM3671MF-ADJ+

Notes

NEW

Date_code

10+

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LM3671

2MHz, 600mA Step-Down DC-DC Converter

General Description

The LM3671 step-down DC-DC converter is optimized for

powering 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.

There are several different fixed voltage output options avail-

able as well as an adjustable output voltage version range

from 1.1V to 3.3V.

The device offers superior features and performance for mo-

bile phones and similar portable systems. Automatic intelli-

gent switching between PWM low-noise and PFM low-current

mode offers improved system control. During PWM mode, the

device operates at a fixed-frequency of 2 MHz (typ). Hys-

teretic 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 ef-

ficiency during PWM mode operation. In shutdown mode, the

device turns off and reduces battery consumption to 0.01 µA

(typ).

The LM3671 is available in SOT23-5, tiny 5-bump micro SMD

and a 6-pin LLP packages in leaded (PB) and lead-free (NO

PB) versions. A high switching frequency of 2 MHz (typ) al-

lows use of tiny surface-mount components. Only three ex-

ternal surface-mount components, an inductor and two

ceramic capacitors, are required.

Typical Application Circuits

201084

FIGURE 1. Typical Application Circuit

Features

■

Applications

■

16 µA typical quiescent current

600 mA maximum load capability

2 MHz PWM fixed switching frequency (typ)

Automatic PFM/PWM mode switching

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 (one inductor, two ceramic capacitors)

Current overload and Thermal shutdown protection

Available in fixed output voltages and adjustable version

SOT23-5, 5-bump micro SMD and 6-pin LLP packages

Mobile phones

PDAs

MP3 players

W-LAN

Portable instruments

Digital still cameras

Portable Hard disk drives

20108401

November 29, 2007

www.national.com

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