LM5008AMM+ National Semiconductor, LM5008AMM+ Datasheet

LM5008AMM+

Manufacturer Part Number

LM5008AMM+

Description

Manufacturer

National Semiconductor

Datasheets

1.LM5008ASDCX.pdf (16 pages)

2.LM5008AMM.pdf (18 pages)

Specifications of LM5008AMM+

Notes

NEW

Date_code

10+

Current page: 1 of 16
Download datasheet (392Kb)

100V, 350 mA Constant On-Time Buck Switching Regulator

General Description

The LM5008A is a functional variant of the LM5008 COT Buck

Switching Regulator. The functional differences of the

LM5008A are: The minimum input operating voltage is 6 volts,

the on-time equation is slightly different, and the requirement

for a minimum load current is removed.

The LM5008A Step Down Switching Regulator features all of

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

bias regulator. This high voltage regulator contains an 100 V

N-Channel Buck Switch. The device is easy to implement and

is provided in the MSOP-8 and the thermally enhanced LLP-8

packages. The regulator is based on a control scheme using

an ON time inversely proportional to V

the operating frequency to remain relatively constant. The

control scheme requires no loop compensation. An intelligent

current limit is implemented with forced OFF time, which is

inversely proportional to Vout. This scheme ensures short

circuit control while providing minimum foldback. Other fea-

tures include: Thermal Shutdown, V

Gate drive under-voltage lockout, Max Duty Cycle limiter, and

a pre-charge switch.

Typical Application, Basic Step-Down Regulator

under-voltage lockout,

. This feature allows

300749

LM5008A

Features

■

Typical Applications

■

Package

■

Operating input voltage range: 6V to 95V

Integrated 100V, N-Channel buck switch

Internal start-up regulator

No loop compensation required

Ultra-Fast transient response

On time varies inversely with input voltage

Operating frequency remains constant with varying line

voltage and load current

Adjustable output voltage from 2.5V

Highly efficient operation

Precision internal reference

Low bias current

Intelligent current limit

Thermal shutdown

Non-Isolated Telecommunication Buck Regulator

Secondary High Voltage Post Regulator

+42V Automotive Systems

MSOP - 8

LLP - 8 (4mm x 4mm)

June 24, 2009

30074901

www.national.com

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