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LM20123

National Semiconductor
Part Number LM20123
Manufacturer National Semiconductor
Description Synchronous Buck Regulator
Published Aug 3, 2009
Detailed Description LM20123 3A, 1.5MHz PowerWise® Synchronous Buck Regulator www.DataSheet4U.com January 16, 2008 LM20123 3A, 1.5MHz Powe...
Datasheet PDF File LM20123 PDF File

LM20123
LM20123

Overview
LM20123 3A, 1.
5MHz PowerWise® Synchronous Buck Regulator www.
DataSheet4U.
com January 16, 2008 LM20123 3A, 1.
5MHz PowerWise® Synchronous Buck Regulator General Description The LM20123 is a full featured 1.
5 MHz synchronous buck regulator capable of delivering up to 3A of continuous output current.
The current mode control loop can be compensated to be stable with virtually any type of output capacitor.
For most cases, compensating the device only requires two external components, providing maximum flexibility and ease of use.
The device is optimized to work over the input voltage range of 2.
95V to 5.
5V making it suited for a wide variety of low voltage systems.
The device features internal over voltage protection (OVP) and over current protection (OCP) circuits for increased system reliability.
A precision enable pin and integrated UVLO allows the turn on of the device to be tightly controlled and sequenced.
Start-up inrush currents are limited by both an internally fixed and externally adjustable Soft-Start circuit.
Fault detection and supply sequencing is possible with the integrated power good circuit.
The LM20123 is designed to work well in multi-rail power supply architectures.
The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin.
If the output of the LM20123 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.
The LM20123 is offered in a 16-pin eTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heatsinks.
Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Input voltage range 2.
95V to 5.
5V Accurate current limit minimizes inductor size 96% efficiency with 1.
5 MHz switching frequency 32 mΩ integrated FET switches Starts up into pre-biased loads Output voltage tracking Peak current mode control Adjustable output voltage down to 0.
8V Adjustable Soft-Start with external capacitor Precision e...


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