Datasheet > LM34919_08

LM34919_08

更新时间： 2024-11-10 11:34:59

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
18页	374K
描述
Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator

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LM34919_08 数据手册

June 2, 2008

LM34919

Ultra Small 40V, 600 mA Constant On-Time Buck Switching

Regulator

General Description

The LM34919 Step Down Switching Regulator features all of

No loop compensation required

■

Ultra-Fast transient response

Operating frequency remains constant with load current

and input voltage

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

bias regulator capable of supplying 0.6A to the load. This buck

regulator contains an N-Channel Buck Switch, and is avail-

able in a micro SMD package. The constant on-time feedback

regulation scheme requires no loop compensation, results in

fast load transient response, and simplifies circuit implemen-

tation. The operating frequency remains constant with line

and load variations due to the inverse relationship between

the input voltage and the on-time. The valley current limit re-

sults in a smooth transition from constant voltage to constant

current mode when current limit is detected, reducing the fre-

quency and output voltage, without the use of foldback. Ad-

ditional features include: VCC under-voltage lockout, thermal

shutdown, gate drive under-voltage lockout, and maximum

duty cycle limiter.

Maximum switching frequency: 2.0 MHz

Maximum Duty Cycle Limited During Start-Up

Adjustable output voltage

Valley Current Limit At 0.64A

Precision internal reference

Low bias current

■

Highly efficient operation

Thermal shutdown

Typical Applications

High Efficiency Point-Of-Load (POL) Regulator

■

Non-Isolated Telecommunication Buck Regulator

Features

Secondary High Voltage Post Regulator

Integrated N-Channel buck switch

■

Package

Integrated start-up regulator

Input Voltage Range: 8V to 40V

micro SMD

■

Basic Step Down Regulator

30004431

300044

www.national.com

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与LM34919_08相关器件

型号	品牌	获取价格	描述	数据表
LM34919_15	TI	获取价格	Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
LM34919B	NSC	获取价格	Evaluation Board provides the design engineer with a fully functional
LM34919B	TI	获取价格	Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
LM34919B_1	NSC	获取价格	Evaluation Board provides the design engineer with a fully functional
LM34919B_15	TI	获取价格	Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
LM34919B-Q1	TI	获取价格	Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
LM34919BQTL	NSC	获取价格	Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator
LM34919BQTL/NOPB	TI	获取价格	Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
LM34919BQTLX	NSC	获取价格	Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator
LM34919BQTLX/NOPB	TI	获取价格	Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator