Datasheet > LM2630

LM2630

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		控制器
页数	文件大小	规格书
15页	257K
描述
Synchronous Step-Down Power Supply Controller

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LM2630 数据手册

February 1999

LM2630

Synchronous Step-Down Power Supply Controller

General Description

Features

n 4.5V to 30V input range

n Adjustable output (1.8V to 6V)

The LM2630 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

n Output Undervoltage shutdown protection

n Programmable soft-start function

n Tiny TSSOP package

Current mode control scheme is used to improve line regula-

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

current limiting.

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- Applications

tures include the external synchronization pin, and the

PGOOD pin to indicate the state of the output voltage.

n Notebook and subnotebook computers

n Cellular phones

Protection circuitry includes thermal shutdown, undervoltage

shut down, soft-start capability, and two levels of current lim-

its: 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 willshut down. This

latched operation is disabled during startup, but an internal

timer will enable it if the output does not come up in the pre-

set time.

n Portable instruments

n Battery-powered digital devices

Typical Application Circuit

DS100120-1

DS100120

www.national.com

12 3 4 5 6 7...15

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与LM2630相关器件

型号	品牌	获取价格	描述	数据表
LM2630MTC-ADJ	NSC	获取价格	Synchronous Step-Down Power Supply Controller
LM2630MTC-ADJX	TI	获取价格	SWITCHING CONTROLLER, 345kHz SWITCHING FREQ-MAX, PDSO20, PLASTIC, TSSOP-20
LM2630MTCX-ADJ	ROCHESTER	获取价格	SWITCHING CONTROLLER, 345kHz SWITCHING FREQ-MAX, PDSO20, TSSOP-20
LM2631	NSC	获取价格	Synchronous Step-Down Power Supply Controller
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

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