Datasheet > LM5642_07

LM5642_07

更新时间： 2024-11-22 04:20:07

品牌	Logo	应用领域
美国国家半导体 - NSC		振荡器转换器
页数	文件大小	规格书
28页	782K
描述
High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization

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LM5642_07 数据手册

June 2007

LM5642/LM5642X

High Voltage, Dual Synchronous Buck Converter with

Oscillator Synchronization

General Description

The LM5642 series consists of two current mode syn-

chronous buck regulator controllers operating 180° out of

phase with each other at a normal switching frequency of

200kHz for the LM5642 and at 375kHz for the LM5642X.

Out of phase operation reduces the input RMS ripple current,

thereby significantly reducing the required input capacitance.

The switching frequency can be synchronized to an external

clock between 150kHz and 250kHz for the LM5642 and be-

tween 200 kHz and 500 kHz for the LM5642X. The two

switching regulator outputs can also be paralleled to operate

as a dual-phase, single output regulator.

Features

Two synchronous buck regulators

■

180° out of phase operation

200kHz fixed nominal frequency: LM5642

375kHz fixed nominal frequency: LM5642X

Synchronizable switching frequency from 150kHz to

250kHz for the LM5642 and 200kHz to 500kHz for the

LM5642X

■

4.5V to 36V input range

■

50µA Shutdown current

Adjustable output from 1.3V to 90% of Vin

The output of each channel can be independently adjusted

from 1.3V to 90% of Vin. An internal 5V rail is also available

externally for driving bootstrap circuitry.

0.04% (typical) line and load regulation accuracy

Current mode control with or without a sense resistor

Independent enable/soft-start pins allow simple sequential

startup configuration.

Current-mode feedback control assures excellent line and

load regulation and wide loop bandwidth for excellent re-

sponse to fast load transients. Current is sensed across either

the Vds of the top FET or across an external current-sense

resistor connected in series with the drain of the top FET.

Configurable for single output parallel operation. (See

Figure 2)

■

Adjustable cycle-by-cycle current limit

■

Input under-voltage lockout

The LM5642 features analog soft-start circuitry that is inde-

pendent of the output load and output capacitance making the

soft-start behavior more predictable and controllable than tra-

ditional soft-start circuits.

Output over-voltage latch protection

Output under-voltage protection with delay

Thermal shutdown

Over-voltage protection is available for both outputs. A UV-

Delay pin is also available to allow delayed shut off time for

the IC during an output under-voltage event.

Self discharge of output capacitors when the regulator is

OFF

TSSOP and eTSSOP (Exposed PAD) packages

■

Applications

Embedded Computer Systems

■

Navigation Systems

Telecom Systems

Set-Top Boxes

WebPAD

Point Of Load Power Architectures

Typical Application Circuit

20060101

200601

www.national.com

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与LM5642_07相关器件

型号	品牌	获取价格	描述	数据表
LM5642MH	NSC	获取价格	High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
LM5642MH/NOPB	TI	获取价格	LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronizati
LM5642MHX	NSC	获取价格	High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
LM5642MHX/NOPB	TI	获取价格	LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronizati
LM5642MTC	TI	获取价格	LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronizati
LM5642MTC	NSC	获取价格	High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
LM5642MTC/NOPB	TI	获取价格	LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronizati
LM5642MTCX	TI	获取价格	LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronizati
LM5642MTCX	NSC	获取价格	High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
LM5642MTCX/NOPB	TI	获取价格	LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronizati

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