LM4510

更新时间： 2024-09-26 00:04:31

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器
页数	文件大小	规格书
18页	2417K
描述
Synchronous Step-Up DC/DC Converter with True Shutdown Isolation

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数据手册

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LM4510 数据手册

October 2007

LM4510

Synchronous Step-Up DC/DC Converter with True

Shutdown Isolation

General Description

The LM4510 is a current mode step-up DC/DC converter with

a 1.2A internal NMOS switch designed to deliver up to 120

mA at 16V from a Li-Ion battery.

The device's synchronous switching operation (no external

Schottky diode) at heavy-load, and non-synchronous switch-

ing operation at light-load, maximizes power efficiency.

Features

18V@80 mA from 3.2V input

■

5V@280 mA from 3.2V input

No external Schottky diode required

85% peak efficiency

Soft start

True shutdown isolation

True shutdown function by synchronous FET and related cir-

cuitry ensures input and output isolation.

Stable with small ceramic or tantalum output capacitors

Output short-circuit protection

■

A programmable soft-start circuit allows the user to limit the

amount of inrush current during startup. The output voltage

can be adjusted by external resistors.

Feedback fault protection

Input under-voltage lock out

The LM4510 features advanced short-circuit protection to

maximize safety during output to ground short condition. Dur-

ing shutdown the feedback resistors and the load are discon-

nected from the input to prevent leakage current paths to

ground.

Thermal shutdown

0.002 µA shutdown current

Wide input voltage range: 2.7V to 5.5V

1.0 MHz fixed frequency operation

Low-profile 10–pin LLP package (3mm x 3mm x 0.8mm)

The LM4510 is available in a 10-pin thermally enhanced

Leadless Leadframe Package: LLP-10.

Applications

Organic LED Panel Power Supply

■

Charging Holster

White LED Backlight

USB Power Supply

Class D Audio Amplifier

Camera Flash LED Driver

Typical Application Circuit

30031001

FIGURE 1. Typical Application Circuit

300310

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