NATIONAL SEMICONDUCTOR LM3150 User's Manual
Summary
The LM3150 SIMPLE SWITCHER Controller is a high-efficiency synchronous step-down power management solution designed for robust power applications ranging from 6V to 42V. This controller offers precise voltage regulation, fast transient response, and comprehensive protection features suitable for critical networking, telecom, and surveillance equipment. The accompanying documentation provides engineers with detailed technical specifications, a deep dive into sophisticated Constant On-Time control architecture, pin descriptions, and application guidance, allowing professional designers to implement reliable, minimum-component power supplies efficiently.
Page 1 Text Content
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October 17, 2008
LM3150 SIMPLE SWITCHER® CONTROLLER, 42V Synchronous Step-Down General Description Features The LM3150 SIMPLE SWITCHER® Controller is an easy to Power Wise® step-down controller use and simplified step down power controller capable of pro-
6V to 42V Wide input voltage range
viding up to 12A of output current in a typical application.
Adjustable output voltage down to 0.6V
Operating with an input voltage range of 6V-42V, the LM3150
Programmable switching frequency up to 1 MHz
features an adjustable output voltage down to 0.6V. The
switching frequency is adjustable up to 1 MHz and the syn- No loop compensation required
chronous architecture provides for highly efficient designs. Fully WEBENCH® enabled The LM3150 controller employs a Constant On-Time (COT)
Low external component count
architecture with a proprietary Emulated Ripple Mode (ERM)
Constant On-Time control
control that allows for the use of low ESR output capacitors,
Ultra-fast transient response
which reduces overall solution size and output voltage ripple. The Constant On-Time (COT) regulation architecture allows Stable with low ESR capacitors for fast transient response and requires no loop compensa-
Output voltage pre-bias startup
tion, which reduces external component count and reduces
Valley current limit
design complexity.
Programmable soft-start
Fault protection features such as thermal shutdown, under- voltage lockout, over-voltage protection, short-circuit protec-
Typical Applications
tion, current limit, and output voltage pre-bias startup allow for a reliable and robust solution. Telecom The LM3150 SIMPLE SWITCHER® concept provides for an Networking Equipment easy to use complete design using a minimum number of ex-
Routers
ternal components and National’s WEBENCH® online design
Security Surveillance
tool. WEBENCH® provides design support for every step of
the design process and includes features such as external Power Modules
component calculation with a new MOSFET selector, electri- cal simulation, thermal simulation, and Build-It boards for prototyping.
Typical Application
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation
© 2008 National Semiconductor Corporation www.national.com
Page Summary Contents For NATIONAL SEMICONDUCTOR LM3150 User's Manual
Manual Details
| Brand | National |
|---|---|
| Pages | 20 |
| File Size | 469.15 KB |
| Published | June 04, 2026 |
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Frequently Asked Questions
What is the input voltage range for the LM3150 controller?
The nominal input voltage range is 6V to 42V.
How do I set the desired output voltage?
Connect a feedback resistor divider between the output and ground at pin FB to set the regulation setting.
Does this device have Over-Voltage Protection (OVP)?
Yes, it provides fault protection features including over-voltage protection, under-voltage lockout, and short-circuit protection.
What is the maximum continuous current capacity?
It features a supply of up to 12A of output current in a typical application.