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Numéro de référence | LM20323A | ||
Description | 3A 500 kHz Synchronous Buck Regulator | ||
Fabricant | National Semiconductor | ||
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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 mΩ/110 mΩ integrated 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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Pages | Pages 20 | ||
Télécharger | [ LM20323A ] |
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