LR9641 Datasheet, PDF (1/8 Pages) Leshan Radio Company – 42V Input Standoff Voltage, 0.7A Step-Down Converter

LESHAN RADIO COMPANY, LTD.
42V Input Standoff Voltage, 0.7A Step-Down Converter
LR9641
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.
TYPICAL APPLICATION
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
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