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LM2854MH-1000 Scheda tecnica(PDF) 1 Page - Texas Instruments

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Il numero della parte LM2854MH-1000
Spiegazioni elettronici  Synchronous SIMPLE SWITCHER Buck Regulator
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM2854MH-1000 Scheda tecnica(HTML) 1 Page - Texas Instruments

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM2854
SNVS560D – MARCH 2008 – REVISED JANUARY 2016
LM2854 4-A 500-kHz / 1-MHz Synchronous SIMPLE SWITCHER® Buck Regulator
1
1 Features
1
Input Voltage Range of 2.95 V to 5.5 V
Maximum Load Current of 4 A
Wide Bandwidth Voltage Mode Control Loop,
Partial Internal Compensation
Fixed Switching Frequency of 500 kHz or 1 MHz
35-m
Ω Integrated MOSFET Switches
Adjustable Output Voltage Down to 0.8 V
Optimized Reference Voltage Initial Accuracy and
Temperature Drift
External Soft-Start Control With Tracking
Capability
Enable Pin With Hysteresis
Low Standby Current of 230 µA
Pre-Biased Load Start-up Capability
Integrated UVLO, OCP, and Thermal Shutdown
100% Duty Cycle Capability
HTSSOP-16 Exposed Pad Package
2 Applications
Low Voltage POL Regulation from 5-V or 3.3-V
Rail
Local Solution for FPGA/DSP/ASIC/µP Core or
I/O Power
Broadband Networking and Communications
Infrastructure
Portable Computing
3 Description
The LM2854 PowerWise™ SIMPLE SWITCHER®
buck regulator is a 500-kHz or 1-MHz step-down
switching voltage regulator capable of driving up to a
4-A
load
with
exceptional
power
conversion
efficiency, line and load regulation, and output
accuracy. The LM2854 can accept an input voltage
rail between 2.95 V and 5.5 V, and deliver an
adjustable and highly accurate output voltage as low
as 0.8 V. Externally established 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
reduces the number of external passive components
and PC board space typically necessary in a voltage
mode buck converter application, yet preserving
flexibility to deal with ceramic 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
comparator simplifies sequencing applications. The
LM2854 is available in an exposed pad HTSSOP-16
package that enhances the thermal performance of
the regulator.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2854
HTSSOP (16)
4.40 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit


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