LM34923MM+ National Semiconductor, LM34923MM+ Datasheet

LM34923MM+

Manufacturer Part Number

LM34923MM+

Description

Manufacturer

National Semiconductor

Datasheets

1.LM34923MM.pdf (22 pages)

2.LM34923MM.pdf (20 pages)

Specifications of LM34923MM+

Notes

NEW

Date_code

10+

Current page: 1 of 20
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80V, 600 mA Constant On-Time Buck Switching Regulator

General Description

The LM34923 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 80V N-

Channel MOSFET Switch and a startup regulator. The device

is easy to implement and is provided in an MSOP-10 package.

The regulator’s control scheme uses an on-time inversely

proportional to V

quency remaining relatively constant with line and load vari-

ations. The control scheme requires no loop compensation,

resulting in fast transient response. An intelligent current limit

is implemented with a forced off-time which is inversely pro-

portional to V

while providing minimum foldback. Other features include:

Thermal Shutdown, VCC Under Voltage Lock-out, Max Duty

Cycle Limiter, a Pre-charge Switch, and a programmable Un-

der Voltage Detector with a status flag output.

Typical Application, Basic Step-Down Regulator

OUT

. This scheme ensures short circuit control

. This feature results in the operating fre-

301417

LM34923

Features

■

Typical Applications

■

Package

■

Operating input voltage range: 6V to 75V

Integrated 80V, N-Channel Buck Switch

Internal start-up regulator

No Loop compensation required

Ultra-Fast Transient Response

Operating frequency remains constant with line and load

variations

Adjustable output voltage from 2.5V

Precision internal reference, ±2.5%

Intelligent current limit reduces foldback

Programmable Input UV detector with status flag output

Pre-charge switch enables bootstrap gate drive with no

load

Thermal shutdown

Non-Isolated Telecommunication Buck Regulator

Secondary High Voltage Post Regulator

+42V Automotive Systems

MSOP - 10

March 1, 2011

www.national.com

30141701

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