Datasheet > LM2651MTCX-2.5

LM2651MTCX-2.5

更新时间： 2024-11-23 00:01:07

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
11页	215K
描述
1.5A High Efficiency Synchronous Switching Regulator

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LM2651MTCX-2.5 数据手册

February 2000

LM2651

1.5A High Efficiency Synchronous Switching Regulator

General Description

Features

n Ultra high efficiency up to 97

The LM2651 switching regulator provides high efficiency

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

This feature makes the LM2651 an ideal fit in

battery-powered applications that demand long battery life in

both run and standby modes.

n High efficiency over a 1.5A to milliamperes load range

n 4V to 14V input voltage range

n 1.8V, 2.5V, 3.3V, or ADJ output voltage

n Internal MOSFET switch with low R_DS(on)of 75mΩ

n 300kHz fixed frequency internal oscillator

n 7µA shutdown current

n Patented current sensing for current mode control

n Input undervoltage lockout

n Adjustable soft-start

Synchronous rectification is used to achieve up to 97 effi-

ciency. At light loads, the LM2651 enters a low power hyster-

etic or “sleep” mode to keep the efficiency high. In many ap-

plications, the efficiency still exceeds 80 at 15mA load. A

shutdown pin is available to disable the LM2651 and reduce

the supply current to less than 10µA.

n Current limit and thermal shutdown

n 16-pin TSSOP package

The LM2651 contains a patented current sensing circuitry for

current mode control. This feature eliminates the external

current sensing resistor required by other current-mode

DC-DC converters.

Applications

n Personal digital assistants (PDAs)

n Computer peripherals

n Battery-powered devices

n Handheld scanners

n High efficiency 5V conversion

The LM2651 has a 300 kHz fixed frequency internal oscilla-

tor. The high oscillator frequency allows the use of extremely

small, low profile components.

A programmable soft-start feature limits current surges from

the input power supply at start up and provides a simple

means of sequencing multiple power supplies.

Other protection features include input undervoltage lockout,

current limiting, and thermal shutdown.

Typical Application

DS100925-1

DS100925-15

Efficiency vs Load Current

(V_IN5V, V_OUT3.3V)

DS100925

www.national.com

12 3 4 5 6 7...11

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与LM2651MTCX-2.5相关器件

型号	品牌	获取价格	描述	数据表
LM2651MTCX-2.5/NOPB	TI	获取价格	2.6A SWITCHING REGULATOR, 345kHz SWITCHING FREQ-MAX, PDSO16, TSSOP-16
LM2651MTCX-3.3	NSC	获取价格	1.5A High Efficiency Synchronous Switching Regulator
LM2651MTCX-3.3	TI	获取价格	2.6A SWITCHING REGULATOR, 345kHz SWITCHING FREQ-MAX, PDSO16, TSSOP-16
LM2651MTCX-3.3/NOPB	NSC	获取价格	IC 2.6 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO16, TSSOP-16, Switching Regu
LM2651MTCX-3.3/NOPB	TI	获取价格	1.5A 高效开关稳压器 \| PW \| 16 \| -40 to 125
LM2651MTCX-ADJ	NSC	获取价格	1.5A High Efficiency Synchronous Switching Regulator
LM2651MTCX-ADJ	TI	获取价格	2.6A SWITCHING REGULATOR, 345kHz SWITCHING FREQ-MAX, PDSO16, TSSOP-16
LM2651MTCX-ADJ/NOPB	NSC	获取价格	IC 2.6 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO16, TSSOP-16, Switching Regu
LM2651MTCX-ADJ/NOPB	TI	获取价格	1.5A 高效开关稳压器 \| PW \| 16 \| -40 to 125
LM2652	NSC	获取价格	1.5A, Dual High Performance Synchronous Buck Regulator

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