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LM20333 Scheda tecnica(PDF) 1 Page - Texas Instruments

Il numero della parte LM20333
Spiegazioni elettronici  3A Synchronous Buck Regulator with Frequency Synchronization
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM20333
www.ti.com
SNVS558C – MAY 2008 – REVISED JANUARY 2009
LM20333 36V, 3A Synchronous Buck Regulator with Frequency Synchronization
Check for Samples: LM20333
1
FEATURES
DESCRIPTION
The LM20333 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
Oscillator Synchronization from 250kHz to
increased system reliability. A precision Enable pin
1.5MHz
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 LM20333 is designed to work well in multi-rail
OVP, UVLO Inputs and PGOOD Output
power supply architectures. The output voltage of the
device can be configured to track a higher voltage rail
Internally Protected with Peak Current Limit,
using the SS/TRK pin. If the output of the LM20333 is
Thermal Shutdown and Restart
pre-biased at startup it will not sink current to pull the
Accurate Current Limit Minimizes Inductor
output low until the internal soft-start ramp exceeds
Size
the voltage at the feedback pin.
Non-linear Current Mode Slope Compensation
The switching frequency of the LM20333 can be
20-Pin HTSSOP Exposed Pad Package
synchronized to an external clock by use of the
SYNC pin. The SYNC pin is capable of synchronizing
APPLICATIONS
to input signals ranging from 250 kHz to 1.5 MHz.
Simple to Design, High Efficiency Point of
The LM20333 is offered in an exposed pad 20-pin
Load Regulation from a 4.5V to 36V Bus
HTSSOP package that can be soldered to the PCB,
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 © 2008–2009, 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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