Datasheet > LM3691TLX-18

LM3691TLX-18

更新时间： 2024-11-15 04:44:23

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器便携式
页数	文件大小	规格书
18页	2202K
描述
High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications

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LM3691TLX-18 数据手册

June 11, 2008

LM3691

High Accuracy, Miniature 1A, Step-Down DC-DC Converter

for Portable Applications

General Description

The LM3691 step-down DC-DC converter is optimized for

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

3 cell NiMH/NiCd batteries. It provides up to 1A load current,

over an input voltage range from 2.3V to 5.5V. There are sev-

eral different fixed voltage output options available.

Features

V_OUT= 0.75V to 1.8V

■

±1% DC output voltage precision

2.3 ≤ V_IN≤ 5.5V

4 MHz switching frequency

■

64 μA (typ.) quiescent current in ECO mode

1A maximum load capability

LM3691 has a mode-control pin that allows the user to select

Forced PWM mode or ECO mode that changes modes be-

tween gated PWM mode and PWM automatically depending

on the load. In ECO, LM3691 offers superior efficiency and

very low I_qunder light load conditions. ECO mode extends the

battery life through reduction of the quiescent current during

light load conditions and system standby.

Automatic ECO/PWM mode switching

Mode Pin to select ECO/Forced PWM mode

1 μH inductor, 4.7 μF input capacitor (0603(1608) case

size) and 4.7 μF output capacitor (0603(1608) case size)

Current overload and thermal shutdown protections

■

The LM3691 is available in a 6–bump micro SMD package.

Only three external surface-mount components, a 1μH induc-

tor, a 4.7 μF input capacitor and a 4.7μF output capacitor, are

required.

Only three tiny surface-mount external components

required (solution size less than 15 mm²)

Applications

Mobile Phones

■

Hand-Held Radios

MP3 players

Portable Hard Disk Drives

Efficiency vs. Output Current

(V_OUT= 1.8V, ECO Mode)

Typical Application Circuit

30013430

FIGURE 1. Typical Application Circuit

30013454

300134

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