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 in SOT23-5

and 5-Bump Micro SMD

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

mobile phones and similar portable systems. Automatic in-

telligent 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). Hysteretic PFM mode extends the battery life by re-

ducing the quiescent current to 16 µA (typ) during light load

and standby operation. Internal synchronous rectification

provides high efficiency 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 and a tiny 5-bump

micro SMD packages in leaded (PB) and lead-free (NO PB)

versions. A high switching frequency of 2 MHz (typ) allows

use of tiny surface-mount components. Only three external

surface-mount components, an inductor and two ceramic

capacitors, are required.

Typical Application Circuits

DS201084

FIGURE 1. Typical Application Circuit

Features

n 16 µA typical quiescent current

n 600 mA maximum load capability

n 2 MHz PWM fixed switching frequency (typ)

n Automatic PFM/PWM mode switching

n Available in fixed output voltages and adjustable version

n SOT23-5 and 5-bump micro SMD packages

n Internal synchronous rectification for high efficiency

n Internal soft start

n 0.01 µA typical shutdown current

n Operates from a single Li-Ion cell battery

n Only three tiny surface-mount external components

n Current overload and Thermal shutdown protection

Applications

n Mobile phones

n PDAs

n MP3 players

n W-LAN

n Portable instruments

n Digital still cameras

n Portable Hard disk drives

required (one inductor, two ceramic capacitors)

20108401

September 2006

www.national.com

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