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National Semiconductor - 3A 500 kHz Synchronous Buck Regulator

Numéro de référence LM20323A
Description 3A 500 kHz Synchronous Buck Regulator
Fabricant National Semiconductor 
Logo National Semiconductor 





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LM20323A fiche technique
www.DataSheet4U.com
January 20, 2009
LM20323A
36V, 3A 500 kHz Synchronous Buck Regulator
General Description
The LM20323A is a full featured 500kHz synchronous buck
regulator capable of delivering up to 3A of load current. The
current mode control loop is externally compensated with only
two components, offering both high performance and ease of
use. The device is optimized to work over the input voltage
range of 4.5V to 36V making it well suited for high 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. Startup inrush currents are limited by both an in-
ternally fixed and externally adjustable soft-start circuit. Fault
detection and supply sequencing are possible with the inte-
grated power good (PGOOD) circuit.
The LM20323A 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 LM20323A 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 LM20323A is offered in an exposed pad 20-pin eTSSOP
package that can be soldered to the PCB, eliminating the
need for bulky heatsinks.
Features
4.5V to 36V input voltage range
3A output current, 5.2A peak current
130 m/110 mintegrated power MOSFETs
93% peak efficiency with synchronous rectification
1.0% feedback voltage accuracy
Current mode control, selectable compensation
Fixed 500 kHz switching frequency
Adjustable output voltage down to 0.8V
Compatible with pre-biased loads
Programmable soft-start with external capacitor
Precision enable pin with hysteresis
Integrated OVP, UVLO, PGOOD
Internally protected with peak current limit, thermal
shutdown and restart
Accurate current limit minimizes inductor size
Non-linear current mode slope compensation
eTSSOP-20 exposed pad package
Applications
Simple to design, high efficiency point of load regulation
from a 4.5V to 36V bus
High Performance DSPs, FPGAs, ASICs and
Microprocessors
Communications Infrastructure, Automotive
Simplified Application Circuit
PowerWise® is a registered trademark of National Semiconductor Corporation.
© 2009 National Semiconductor Corporation 300772
30077201
www.national.com

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