LR9641 datasheet(1/8 Pages) LRC

Part #	LR9641

Description	42V Input Standoff Voltage, 0.7A Step-Down Converter

PDF	8 Pages

Scroll/Zoom	100%

Manufacturer	LRC [Leshan Radio Company]

Direct Link	http://www.lrc.cn/

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42V Input Standoff Voltage, 0.7A Step-Down Converter

DESCRIPTION

The LR9641 is a wide input range, high-efficiency,

and high frequency DC-to-DC step-down

switching regulator, capable of delivering up to

0.7A of output current. With a fixed switching

frequency of 660KHz, this current mode PWM

controlled converter allows the use of small

external components, such as ceramic input and

output caps, as well as small inductors.LR9641

also employs a proprietary control scheme that

switches the device into a power save mode

during light load, thereby extending the range of

high efficiency operation. An OVP function

protects the IC itself and its downstream system

against input voltage surges. With this OVP

function, the IC can stand off input voltage as

high as 42V, making it an ideal solution for

industrial applications such as smart meters as

well as automotive applications.

In automotive systems, power comes from the

battery, with its voltage typically between 9V and

24V. Including cold crank and double battery

jump-starts, the minimum input voltage may be

as low as 4V and the maximum up to 36V, with

even higher transient voltages. With these high

input voltages, linear regulators cannot be used

for high supply currents without overheating the

regulator. Instead, high efficiency switching

regulators such as LR9641 must be used to

minimize thermal dissipation.

LR9641 is available SOT23-6 Packages.

FEATURES

• Wide Input Operating Range from 4V to 38V

• Standoff Input Voltage: 42V

• High Efficiency at 12V In 5V Out: Up to 92%:

• High Efficiency PFM mode at light load

• Capable of Delivering 0.7A

• No External Compensation Needed

• Current Mode control

• Logic Control Shutdown

• Thermal shutdown and UVLO

• Available in SOT23-6 Package

APPLICATIONS

• Smart Meters

• Industrial Applications

• Automotive Applications

PIN OUT

TYPICAL APPLICATION

LR9641

LESHAN RADIO COMPANY, LTD.

1/8

Ver 1.2

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