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LM20323 Datasheet

  • LM20323

  • 36V, 3A PowerWise㈢ 500 kHz Synchronous Buck Regulator

  • 20頁

  • NSC

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LM20323 36V, 3A PowerWise
廬
500 kHz Synchronous Buck Regulator
June 2, 2008
LM20323
36V, 3A PowerWise
廬
500 kHz Synchronous Buck Regulator
General Description
The LM20323 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 LM20323 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 LM20323 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 LM20323 is offered in an exposed pad 20-pin eTSSOP
package that can be soldered to the PCB, eliminating the
need for bulky heatsinks.
Features
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4.5V to 36V input voltage range
3A output current, 5.2A peak current
130 m鈩?110 m鈩?integrated power MOSFETs
93% peak efficiency with synchronous rectification
1.5% 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
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Accurate current limit minimizes inductor size
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Non-linear current mode slope compensation
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eTSSOP-20 exposed pad package
Applications
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Simple to design, high efficiency point of load regulation
from a 4.5V to 36V bus
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High Performance DSPs, FPGAs, ASICs and
Microprocessors
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Communications Infrastructure, Automotive
Simplified Application Circuit
30051501
PowerWise
廬
is a registered trademark of National Semiconductor Corporation.
漏 2008 National Semiconductor Corporation
300515
www.national.com

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