LM3150 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – SIMPLE SWITCHER® CONTROLLER, 42V Synchronous Step-Down

October 17, 2008
LM3150
SIMPLE SWITCHER^® CONTROLLER, 42V Synchronous
Step-Down
General Description
The LM3150 SIMPLE SWITCHER^® Controller is an easy to
use and simplified step down power controller capable of pro-
viding up to 12A of output current in a typical application.
Operating with an input voltage range of 6V-42V, the LM3150
features an adjustable output voltage down to 0.6V. The
switching frequency is adjustable up to 1 MHz and the syn-
chronous architecture provides for highly efficient designs.
The LM3150 controller employs a Constant On-Time (COT)
architecture with a proprietary Emulated Ripple Mode (ERM)
control that allows for the use of low ESR output capacitors,
which reduces overall solution size and output voltage ripple.
The Constant On-Time (COT) regulation architecture allows
for fast transient response and requires no loop compensa-
tion, which reduces external component count and reduces
design complexity.
Fault protection features such as thermal shutdown, under-
voltage lockout, over-voltage protection, short-circuit protec-
tion, current limit, and output voltage pre-bias startup allow for
a reliable and robust solution.
The LM3150 SIMPLE SWITCHER^® concept provides for an
easy to use complete design using a minimum number of ex-
ternal components and National’s WEBENCH^® online design
tool. WEBENCH^® provides design support for every step of
the design process and includes features such as external
component calculation with a new MOSFET selector, electri-
cal simulation, thermal simulation, and Build-It boards for
prototyping.
Features
■ ^{PowerWise® step-down controller}
■ ^{6V to 42V Wide input voltage range}
■ ^{Adjustable output voltage down to 0.6V}
■ ^{Programmable switching frequency up to 1 MHz}
■ ^{No loop compensation required}
■ ^{Fully WEBENCH® enabled}
■ ^{Low external component count}
■ ^{Constant On-Time control}
■ ^{Ultra-fast transient response}
■ ^{Stable with low ESR capacitors}
■ ^{Output voltage pre-bias startup}
■ ^{Valley current limit}
■ ^{Programmable soft-start}
Typical Applications
■ ^Telecom
■ ^{Networking Equipment}
■ ^Routers
■ ^{Security Surveillance}
■ ^{Power Modules}
Typical Application
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation
© 2008 National Semiconductor Corporation 300531
30053101
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