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LM2854 데이터시트(PDF) 1 Page - Texas Instruments

부품명 LM2854
상세설명  4A 500 kHz / 1 MHz Synchronous SIMPLE SWITCHER짰 Buck Regulator
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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LM2854 데이터시트(HTML) 1 Page - Texas Instruments

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PVIN
AVIN
EN
AGND
PGND
FB
SW
LM2854
VIN
VOUT
SS
CIN
LO
CO
RFB1
RCOMP
CCOMP
RFB2
CSS
LM2854
www.ti.com
SNVS560B – MARCH 2008 – REVISED NOVEMBER 2008
LM2854 4A 500 kHz / 1 MHz Synchronous SIMPLE SWITCHER® Buck Regulator
Check for Samples: LM2854
1
FEATURES
Broadband Networking and Communications
Infrastructure
234
Input Voltage Range of 2.95V to 5.5V
Portable Computing
Maximum Load Current of 4A
Wide Bandwidth Voltage Mode Control Loop,
DESCRIPTION
Partial Internal Compensation
The LM2854 PowerWise™ SIMPLE SWITCHER
Fixed Switching Frequency of 500 kHz or 1
buck regulator is a 500 kHz or 1 MHz step-down
MHz
switching voltage regulator capable of driving up to a
4A load with exceptional power conversion efficiency,
35 m
Ω Integrated MOSFET Switches
line and load regulation, and output accuracy. The
Adjustable Output Voltage Down to 0.8V
LM2854 can accept an input voltage rail between
Optimized Reference Voltage Initial Accuracy
2.95V and 5.5V and deliver an adjustable and highly
and Temperature Drift
accurate output voltage as low as 0.8V. Externally
established soft-start with a small capacitor facilitates
External Soft-Start Control with Tracking
controlled start-up, and the LM2854 is capable of
Capability
starting gracefully into a pre-biased output voltage.
Enable Pin with Hysteresis
Partial internal compensation reduces the number of
Low Standby Current of 230 µA
external passive components and PC board space
typically necessary in a voltage mode buck converter
Pre-Biased Load Startup Capability
application, yet preserving flexibility to deal with
Integrated UVLO, OCP and Thermal Shutdown
ceramic and/or electrolytic based load capacitors.
100% Duty Cycle Capability
Lossless cycle-by-cycle peak current limit is used to
protect the load from an overcurrent or short-circuit
HTSSOP-16 Exposed Pad Package
fault,
and
an
enable
comparator
simplifies
sequencing applications. The LM2854 is available in
APPLICATIONS
an exposed pad HTSSOP-16 package that enhances
Low Voltage POL Regulation from 5V or 3.3V
the thermal performance of the regulator.
Rail
Local Solution for FPGA/DSP/ASIC/µP Core or
I/O Power
Typical Application Circuit
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
SIMPLE SWITCHER is a registered trademark of Texas Instruments, Inc.
3
PowerWise is a trademark of Texas Instrumetns, Inc.
4
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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