LM2642

更新时间： 2024-11-26 00:01:07

品牌	Logo	应用领域
美国国家半导体 - NSC		开关控制器
页数	文件大小	规格书
21页	606K
描述
Two-Phase Synchronous Step-Down Switching Controller

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LM2642 数据手册

May 2003

LM2642

Two-Phase Synchronous Step-Down Switching

Controller

General Description

The LM2642 consists of two current mode synchronous

buck regulator controllers with a switching frequency of

300kHz.

Features

n Two synchronous buck regulators

n 180˚ out of phase operation

n 4.5V to 30V input range

The two switching regulator controllers operate 180˚ out of

phase. This feature reduces the input ripple RMS current,

thereby significantly reducing the required input capacitance.

The two switching regulator outputs can also be paralleled to

operate as a dual-phase single output regulator.

n Power good function monitors Ch.1

n 37µA Shutdown current

n 0.04% (typical) line and load regulation error

n Current mode control with or without a sense resistor

n Independent enable/soft-start pins allow simple

sequential startup configuration.

n Configurable for single output parallel operation. (See

Figure 2).

The output of each channel can be independently adjusted

from 1.3 to V_IN• maximum duty cycle. An internal 5V rail is

also available externally for driving bootstrap circuitry.

Current-mode feedback control assures excellent line and

load regulation and a wide loop bandwidth for excellent

response 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. Current limit is independently adjustable for each chan-

nel.

n Adjustable cycle-by-cycle current limit

n Input under-voltage lockout

n Output over-voltage latch protection

n Output under-voltage protection with delay

n Thermal shutdown

n Self discharge of output capacitors when the regulator is

OFF

n TSSOP package

The LM2642 features analog soft-start circuitry that is inde-

pendent of the output load and output capacitance. This

makes the soft-start behavior more predictable and control-

lable than traditional soft-start circuits.

Applications

n Embedded computer systems

n High end gaming systems

n Set-top boxes

A PGOOD1 pin is provided to monitor the dc output of

channel 1. Over-voltage protection is available for both out-

puts. A UV-Delay pin is also available to allow delayed shut

off time for the IC during an output under-voltage event.

n WebPAD

Block Diagram

20046201

DS200462

www.national.com

12 3 4 5 6 7...21

中文翻译

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与LM2642相关器件

型号	品牌	获取价格	描述	数据表
LM26420	NSC	获取价格	Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator
LM26420	TI	获取价格	Dual 2-A Automotive-Qualified, High-Efficiency Synchronous DC-DC Converter
LM26420_15	TI	获取价格	LM26420/LM26420-Q0/Q1 Dual 2-A Automotive-Qualified, High-Efficiency Synchronous DC-DC Con
LM26420-Q0	TI	获取价格	LM26420/LM26420-Q0/Q1 Dual 2-A Automotive-Qualified, High-Efficiency Synchronous DC-DC Con
LM26420Q0XMH/NOPB	TI	获取价格	通过汽车认证的双路 2A 高效同步直流/直流转换器 \| PWP \| 20 \| -40 to
LM26420Q0XMHX/NOPB	TI	获取价格	通过汽车认证的双路 2A 高效同步直流/直流转换器 \| PWP \| 20 \| -40 to
LM26420-Q1	TI	获取价格	LM26420/LM26420-Q0/Q1 Dual 2-A Automotive-Qualified, High-Efficiency Synchronous DC-DC Con
LM26420Q1XMH/NOPB	TI	获取价格	通过汽车认证的双路 2A 高效同步直流/直流转换器 \| PWP \| 20 \| -40 to
LM26420Q1XMHX/NOPB	TI	获取价格	通过汽车认证的双路 2A 高效同步直流/直流转换器 \| PWP \| 20 \| -40 to
LM26420Q1XSQ/NOPB	TI	获取价格	通过汽车认证的双路 2A 高效同步直流/直流转换器 \| RUM \| 16 \| -40 to

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