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LM20242MHX Datasheet

  • LM20242MHX

  • 36V, 2A PowerWise㈢ Adjustable Frequency Synchronous Buck Re...

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LM20242 36V, 2A PowerWise
廬
Adjustable Frequency Synchronous Buck Regulator
November 1, 2007
LM20242
36V, 2A PowerWise
廬
Adjustable Frequency Synchronous
Buck Regulator
General Description
The LM20242 is a full featured 1MHz capable synchronous
buck regulator capable of delivering up to 2A of load current.
The current mode control loop is externally compensated with
only two external components, offering both high perfor-
mance 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 PGOOD circuit.
The LM20242 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 LM20242 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 LM20242 is offered in an exposed pad 20 pin TSSOP
package that can be soldered to the PCB, eliminating the
need for bulky heatsinks.
Features
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2A Output Current, 3.7A peak current
130 m鈩?110 m鈩?integrated power MOSFETs
1.5% output voltage accuracy
Current Mode Control, selectable compensation
Resistor programmed, 1MHz capable oscillator
Synchronous rectifier with diode emulation
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 with frequency foldback
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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
30031401
PowerWise
廬
is a registered trademark of National Semiconductor Corporation.
漏 2007 National Semiconductor Corporation
300314
www.national.com

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