LM5008MM+ National Semiconductor, LM5008MM+ Datasheet

LM5008MM+

Manufacturer Part Number

LM5008MM+

Description

Manufacturer

National Semiconductor

Datasheet

1.LM5008MM.pdf (16 pages)

Specifications of LM5008MM+

Notes

NEW

Date_code

10+

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LM5008

High Voltage (100V) Step Down Switching Regulator

General Description

The LM5008 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 hysteretic

control scheme using an ON time inversely proportional to

relatively constant. The hysteretic control 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 protection while providing

minimum foldback. Other protection features include: Ther-

mal Shutdown, V

voltage lockout, and Max Duty Cycle limiter

Connection Diagram

Ordering Information

. This feature allows the operating frequency to remain

Order Number

LM5008MM

LM5008MMX

LM5008SD

LM5008SDX

LM5008SDC

LM5008SDCX

under-voltage lockout, Gate drive under-

Package Type

MSOP-8

LLP-8

DS200979

8-Lead MSOP, LLP

NSC Package Drawing

MUA08A

SDC08A

SDC08B

Features

n Integrated 100V, N-Channel buck switch

n Internal V

n No loop compensation required

n Ultra-Fast transient response

n On time varies inversely with line voltage

n Operating frequency remains constant with varying line

n Adjustable output voltage

n Highly efficient operation

n Precision internal reference

n Low bias current

n Intelligent current limit protection

n Thermal shutdown

Typical Applications

n Non-Isolated Telecommunication Buck Regulator

n Secondary High Voltage Post Regulator

n +42V Automotive Systems

Package

n MSOP - 8

n LLP - 8 (4mm x 4mm)

voltage and load current

20097902

regulator

Supplied As

1000 Units on Tape and Reel

3500 Units on Tape and Reel

1000 Units on Tape and Reel

4500 Units on Tape and Reel

1000 Units on Tape and Reel

4500 Units on Tape and Reel

September 2006

www.national.com

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