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LM2854MH-500 Datasheet

  • LM2854MH-500

  • 4A 500 kHz / 1 MHz PowerWise㈢ Synchronous SIMPLE SWITCHER㈢...

  • 22頁

  • NSC

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LM2854 4A 500 kHz / 1 MHz PowerWise廬 Synchronous SIMPLE SWITCHER廬 Buck Regulator
April 2, 2008
LM2854
4A 500 kHz / 1 MHz PowerWise廬 Synchronous SIMPLE
SWITCHER廬 Buck Regulator
General Description
The LM2854 PowerWise
廬
SIMPLE SWITCHER
廬
buck regu-
lator is a 500 kHz or 1 MHz step-down switching voltage
regulator capable of driving up to a 4A load with exceptional
power conversion efficiency, line and load regulation, and
output accuracy. The LM2854 can accept an input voltage rail
between 2.95V and 5.5V and deliver an adjustable and highly
accurate output voltage as low as 0.8V. Externally estab-
lished soft-start with a small capacitor facilitates controlled
start-up, and the LM2854 is capable of starting gracefully into
a pre-biased output voltage. Partial internal compensation re-
duces the number of external passive components and PC
board space typically necessary in a voltage mode buck con-
verter application, yet preserving flexibility to deal with ce-
ramic and/or electrolytic based load capacitors. Lossless
cycle-by-cycle peak current limit is used to protect the load
from an overcurrent or short-circuit fault, and an enable com-
parator simplifies sequencing applications. The LM2854 is
available in an exposed pad TSSOP-16 package that en-
hances the thermal performance of the regulator.
Features
鈻?/div>
Input voltage range of 2.95V to 5.5V
鈻?/div>
Maximum load current of 4A
鈻?/div>
Wide bandwidth voltage mode control loop, partial internal
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
compensation
Fixed switching frequency of 500 kHz or 1 MHz
35 m鈩?integrated MOSFET switches
Adjustable output voltage down to 0.8V
Optimized reference voltage initial accuracy and
temperature drift
External soft-start control with tracking capability
Enable pin with hysteresis
Low standby current of 230 碌A(chǔ)
Pre-biased load startup capability
Integrated UVLO, OCP and thermal shutdown
100% duty cycle capability
eTSSOP-16 exposed pad package
Applications
鈻?/div>
Low Voltage POL Regulation from 5V or 3.3V Rail
鈻?/div>
Local Solution for FPGA/DSP/ASIC/碌P Core or I/O Power
鈻?/div>
Broadband Networking and Communications
Infrastructure
鈻?/div>
Portable Computing
Typical Application Circuit
30052801
SIMPLE SWITCHER廬 is a Registered Trademark of National Semiconductor Corporation.
漏 2008 National Semiconductor Corporation
300528
www.national.com

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