Datasheet > FAN5308_07

FAN5308_07

更新时间： 2024-11-11 04:18:11

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		转换器
页数	文件大小	规格书
11页	464K
描述
800mA High-Efficiency Step-Down DC-DC Converter

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FAN5308_07 数据手册

June 2007

FAN5308

800mA High-Efficiency Step-Down DC-DC Converter

Features

Description

■ 96% efficiency, synchronous operation

■ Adjustable output voltage options from 0.8V to V_IN

■ 2.5V to 5.5V input voltage range

■ Up to 800mA output current

Designed for use in battery-powered applications, the

FAN5308 is a high-efficiency, low-noise synchronous

PWM current mode and pulse skip (power-save) mode

DC-DC converter. It can provide up to 800mA of output

current over an input range from 2.5V to 5.5V. The output

voltage can be externally adjusted over a range of 0.8V

to 5.5V by means of an external voltage divider.

■ Fixed-frequency 1.3MHz PWM operation

■ High-efficiency, power-save mode

■ 100% duty cycle low-dropout operation

■ Soft-start

At moderate and light loads, pulse skipping modulation is

used. Dynamic voltage positioning is applied and the

output voltage is shifted 0.8% above nominal value for

increased headroom during load transients. At higher

loads, the system automatically switches over to current

mode PWM control, operating at 1.3MHz. A current

mode control loop with fast transient response ensures

excellent line and load regulation. To achieve high effi-

ciency and ensure long battery life, the quiescent current

is reduced to 25µA in power-save mode, and the supply

current drops below 1µA in shut-down mode. The

FAN5308 is available in a 3x3mm 6-lead MLP package.

■ Output over-voltage protection

■ Dynamic output voltage positioning

■ 25µA quiescent current

■ Thermal shutdown and short-circuit protection

■ Pb-free 3x3mm 6-lead MLP package

Applications

■ Pocket PCs, PDAs

■ Cell phones

■ Battery-powered portable devices

■ Digital cameras

■ Hard disk drives

■ Set-top boxes

■ Point-of-load power

■ Notebook computers

■ Communications equipment

Ordering Information

Product Number

Output Voltage

Package Type

Order Code

FAN5308

Adjustable

3x3mm 6-Lead MLP

FAN5308MPX

Typical Application

OUT

1.2V (800mA)

3.3μH

C_IN

PGND

(AGND)

C_OUT

2 x 10μF

5KΩ

10μF

10KΩ

Figure 1. Typical Application

FAN5308 Rev. 1.0.2

www.fairchildsemi.com

12 3 4 5 6 7...11

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