LM20123 Datasheet PDF - National Semiconductor

Part Number LM20123
Description Synchronous Buck Regulator
Manufacturers National Semiconductor 
Logo National Semiconductor Logo 

Preview ( 20 pages )
LM20123 datasheet, circuit
January 16, 2008
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 ex-
ternal 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 sys-
tem 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.
Input voltage range 2.95V to 5.5V
Accurate current limit minimizes inductor size
96% efficiency with 1.5 MHz switching frequency
32 mintegrated 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 enable pin with hysteresis
Integrated OVP, UVLO, power good and thermal
eTSSOP-16 exposed pad package
Simple to design, high efficiency point of load regulation
from a 5V or 3.3V bus
High Performance DSPs, FPGAs, ASICs and
Broadband, Networking and Optical Communications
Typical Application Circuit
PowerWise® is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation 300301

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1 page
LM20123 equivalent
www.DataSheetE4rUr.ocromAmplifier Gain vs. Frequency
Line Regulation
Load Regulation
Feedback Pin Voltage vs. Temperature
Switching Frequency vs. Temperature
Quiescent Current vs. VIN (Not Switching)

5 Page

Information Total 20 Pages
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