LM2854_16 Datasheet, PDF (1/33 Pages) Texas Instruments – Synchronous SIMPLE SWITCHER Buck Regulator

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LM2854
SNVS560D – MARCH 2008 – REVISED JANUARY 2016
LM2854 4-A 500-kHz / 1-MHz Synchronous SIMPLE SWITCHER® Buck Regulator
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-mΩ 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
V_IN
C_IN
LM2854
PVIN
SW
AVIN
EN
FB
SS
AGND PGND
C_SS
R_FB2
L_O
C_O
V_OUT
R_FB1
R_COMP CCOMP
1
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.