Datasheet > LM2653_05

LM2653_05

更新时间： 2024-11-02 04:44:39

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器开关
页数	文件大小	规格书
12页	664K
描述
1.5A High Efficiency Synchronous Switching Regulator

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LM2653_05 数据手册

April 2005

LM2653

1.5A High Efficiency Synchronous Switching Regulator

General Description

Features

n Efficiency up to 97%

The LM2653 switching regulator provides high efficient

power conversion over a 100:1 load range (1.5A to 15 mA).

This feature makes the LM2653 an ideal fit in battery-

powered applications.

n 4V to 14V input voltage range

n 1.5V to 5.0V adjustable output voltage

n 0.1Ω Switch On Resistance

Synchronous rectification is used to achieve up to 97%

efficiency. At light loads, the LM2653 enters a low power

hysteretic or “sleep” mode to keep the efficiency high. In

many applications, the efficiency still exceeds 80% at 15 mA

load. A shutdown pin is available to disable the LM2653 and

reduce the supply current to 7µA.

n 300 kHz fixed frequency internal oscillator

n 7 µA shutdown current

n Patented current sensing for current mode control

n Input undervoltage lockout

n Output overvoltage shutdown protection

n Output undervoltage shutdown protection

n Adjustable soft-start

All the power, control, and drive functions are integrated

within the ICs. The ICs contain patented current sensing

circuity for current mode control. This feature eliminates the

external current sensing resistor required by other current-

mode DC-DC converters.

n Adjustable PGOOD delay

n Current limit and thermal shutdown

Applications

The ICs have a 300 kHz fixed frequency internal oscillator.

The high oscillator frequency allows the use of extremely

small, low profile components.

n Webpad

n Personal digital assistants (PDAs)

n Computer peripherals

n Battery-powered devices

n Notebook computer video supply

n Handheld scanners

Protection features include thermal shutdown, input under-

voltage lockout, adjustable soft-start, cycle by cycle current

limit, output overvoltage and undervoltage protections.

n GXM I/O and core voltage

n High efficiency 5V conversion

Typical Application

Efficiency vs Load Current

(V_IN= 5V, V_OUT= 3.3V)

10104930

10104902

DS101049

www.national.com

12 3 4 5 6 7...12

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