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LM20343 Datenblatt(PDF) 1 Page - Texas Instruments

Teilenummer LM20343
Bauteilbeschribung  36V, 3A Adjustable Frequency Synchronous Buck Regulator
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LM20343
www.ti.com
SNVS559A – MAY 2008 – REVISED AUGUST 2008
LM20343 36V, 3A Adjustable Frequency Synchronous Buck Regulator
Check for Samples: LM20343
1
FEATURES
DESCRIPTION
The LM20343 is a full featured synchronous buck
2
4.5V to 36V Input Voltage Range
regulator capable of delivering up to 3A of load
3A Output Current, 5.2A Peak Current
current. The current mode control loop is externally
130 m
Ω/110 mΩ Integrated Power MOSFETs
compensated with only two components, offering both
high performance and ease of use. The device is
94% Peak Efficiency with Synchronous
optimized to work over the input voltage range of
Rectification
4.5V to 36V making it well suited for high voltage
1.5% Feedback Voltage Accuracy
systems.
Current Mode Control, Selectable
The device features internal Over Voltage Protection
Compensation
(OVP) and Over Current Protection (OCP) circuits for
Resistor Programmed, 1MHz Capable
increased system reliability. A precision Enable pin
Oscillator
and integrated UVLO allows the turn on of the device
to be tightly controlled and sequenced. Startup inrush
Adjustable Output Voltage Down to 0.8V
currents are limited by both an internally fixed and
Compatible with Pre-biased Loads
externally adjustable soft-start circuit. Fault detection
Programmable Soft-start with External
and
supply
sequencing
are
possible
with
the
Capacitor
integrated power good (PGOOD) circuit.
Precision Enable Pin with Hysteresis
The frequency of this device can be adjusted from
OVP, UVLO Inputs and PGOOD Output
250 kHz to 1.0 MHz by connecting an external
resistor from the RT pin to ground.
Internally Protected with Peak Current Limit,
Thermal Shutdown and Restart
The LM20343 is designed to work well in multi-rail
power supply architectures. The output voltage of the
Accurate Current Limit Minimizes Inductor
device can be configured to track a higher voltage rail
Size
using the SS/TRK pin. If the output of the LM20343 is
Non-linear Current Mode Slope Compensation
pre-biased at startup it will not sink current to pull the
20-Pin HTSSOP Exposed Pad Package
output low until the internal soft-start ramp exceeds
the voltage at the feedback pin.
APPLICATIONS
The LM20343 is offered in an exposed pad 20-pin
Simple to Design, High Efficiency Point of
HTSSOP package that can be soldered to the PCB,
Load Tegulation from a 4.5V to 36V Bus
eliminating the need for bulky heatsinks.
High Performance DSPs, FPGAs, ASICs and
Microprocessors
Communications Infrastructure, Automotive
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
All 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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