LM34910

更新时间： 2024-11-07 21:54:23

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	581K
描述
High Voltage (40V, 1.25A) Step Down Switching Regulator

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LM34910 数据手册

February 2005

LM34910

High Voltage (40V, 1.25A) Step Down Switching

Regulator

n Ultra-Fast transient response

n Operating frequency remains constant with load current

and input voltage

n Maximum Duty Cycle Limited During Start-Up

n Adjustable output voltage

n Valley Current Limit At 1.25A

n Precision internal reference

n Low bias current

General Description

The LM34910 Step Down Switching Regulator features all of

the functions needed to implement a low cost, efficient, buck

bias regulator capable of supplying 1.25A to the load. This

buck regulator contains a 40V N-Channel Buck Switch, and

is available in the thermally enhanced LLP-10 package. The

hysteretic regulation scheme requires no loop compensa-

tion, results in fast load transient response, and simplifies

circuit implementation. The operating frequency remains

constant with line and load variations due to the inverse

relationship between the input voltage and the on-time. The

current limit detection is set at 1.25A. Additional features

include: VCC under-voltage lockout, thermal shutdown, gate

drive under-voltage lockout, and maximum duty cycle limiter.

n Highly efficient operation

n Thermal shutdown

Typical Applications

n High Efficiency Point-Of-Load (POL) Regulator

n Non-Isolated Telecommunication Buck Regulator

n Secondary High Voltage Post Regulator

Features

n Integrated 40V, N-Channel buck switch

n Integrated start-up regulator

n Input Voltage Range: 8V to 36V

n No loop compensation required

Package

n LLP-10 (4 mm x 4 mm)

n Exposed Thermal Pad For Improved Heat Dissipation

Connection Diagram

20110902

10-Lead LLP

Ordering Information

Order Number

LM34910SD

Package Type

NSC Package Drawing

Supplied As

LLP-10 (4x4)

SDC10A

1000 Units on Tape and Reel

4500 Units on Tape and Reel

LM34910SDX

DS201109

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