Datasheet > LM2631

LM2631

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		控制器
页数	文件大小	规格书
13页	256K
描述
Synchronous Step-Down Power Supply Controller

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LM2631 数据手册

April 1999

LM2631

Synchronous Step-Down Power Supply Controller

General Description

Features

n 4.5V to 30V input range

n Adjustable output (1.5V to 7V)

The LM2631 controller provides all the active functions for

step-down (buck) switching converters. These dc-to-dc con-

verters provide core CPU power in battery-operated sys-

tems.

n 200 kHz to 400 kHz adjustable operating frequency

n Externally synchronizable

High efficiency is achieved by using synchronous rectifica-

tion and pulse-skipping mode operation at light load. Inex-

pensive N-channel MOSFETs are used to reduce system

cost. Bootstrap circuit is used to drive the high-side

N-channel MOSFET.

n On-board power good function

n Precision 1.24V reference output

n 0.8 mA typical quiescent current

n 0.1 µA shutdown current

n Thermal shutdown

n Direct current limit protection

n Input undervoltage lockout

Current mode control scheme is used to improve line regula-

tion and transient response, also provides cycle-by-cycle

current limiting.

n Output undervoltage shutdown protection

n Output overvoltage shutdown protection

n Programmable soft-start function

n Tiny TSSOP package

The operating frequency is adjustable between 200 kHz and

400 kHz. An external shutdown pin can be used to disable

the device and reduce the quiescent current to 0.1 µA. In low

noise applications, bringing the FPWM pin high can force the

device to operate in constant frequency mode. Other fea-

tures include the external synchronization pin, and the

PGOOD pin to indicate the state of the output voltage.

Applications

n Notebook and subnotebook computers

n Cellular phones

n Portable instruments

n Battery-powered digital devices

Protection circuitry includes thermal shutdown, undervoltage

and overvoltage shutdown protection, soft-start capability,

and two levels of current limits: The first level simply limits

the load current directly; at the second level, if the load pulls

the output voltage down below 80% of the regulated value,

the chip will shut down. This operation is disabled during

startup, but an internal timer will enable it if the output does

not come up in the preset time.

Typical Application Circuit

DS100937-1

DS100937

www.national.com

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与LM2631相关器件

型号	品牌	获取价格	描述	数据表
LM2631MTC-ADJ	NSC	获取价格	Synchronous Step-Down Power Supply Controller
LM2631MTC-ADJ/NOPB	TI	获取价格	SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20
LM2631MTCX-ADJ/NOPB	TI	获取价格	SWITCHING CONTROLLER, 400kHz SWITCHING FREQ-MAX, PDSO20, TSSOP-20
LM2633	NSC	获取价格	Advanced Two-Phase Synchronous Triple Regulator Controller for Notebook CPUs
LM2633MTD	NSC	获取价格	Advanced Two-Phase Synchronous Triple Regulator Controller for Notebook CPUs
LM2633MTD/NOPB	ROCHESTER	获取价格	SWITCHING CONTROLLER, 275kHz SWITCHING FREQ-MAX, PDSO48, TSSOP-48
LM2635	NSC	获取价格	5-Bit Programmable Synchronous Buck Regulator Controller
LM2635M	NSC	获取价格	5-Bit Programmable Synchronous Buck Regulator Controller
LM2635MX	ETC	获取价格	Voltage-Mode SMPS Controller
LM2635MX/NOPB	TI	获取价格	SWITCHING CONTROLLER, 350kHz SWITCHING FREQ-MAX, PDSO20, PLASTIC, SO-20

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