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LM20343MHE Datasheet

  • LM20343MHE

  • 36V, 3A Adjustable Frequency Synchronous Buck Regulator

  • 20頁

  • NSC

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LM20343 36V, 3A Adjustable Frequency Synchronous Buck Regulator
August 12, 2008
LM20343
36V, 3A Adjustable Frequency Synchronous Buck
Regulator
General Description
The LM20343 is a full featured 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 frequency of this device can be adjusted from 250 kHz to
1.0 MHz by connecting an external resistor from the RT pin
to ground.
The LM20343 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 LM20343 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 LM20343 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
94% peak efficiency with synchronous rectification
1.5% feedback voltage accuracy
Current mode control, selectable compensation
Resistor programmed, 1MHz capable oscillator
Adjustable output voltage down to 0.8V
Compatible with pre-biased loads
Programmable soft-start with external capacitor
Precision enable pin with hysteresis
OVP, UVLO inputs and PGOOD output
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
30051701
漏 2008 National Semiconductor Corporation
300517
www.national.com

LM20343MHE 產(chǎn)品屬性

  • TSSOP

  • 20

  • -40°C 到 +125°C

  • No SVHC (19-Dec-2011)

  • 20343

  • TSSOP

  • 3A

  • Synchronous Buck

  • 36V

  • 4.5V

  • 表面安裝

  • 36V

  • 0.8V

  • 32V

  • 32V

  • 3A

  • 1MHz

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