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LM20343_15

更新时间： 2024-11-13 01:09:55
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德州仪器 - TI /
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29页 1345K
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LM20343 36V, 3A Adjustable Frequency Synchronous Buck Regulator

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LM20343  
www.ti.com  
SNVS559B –MAY 2008–REVISED APRIL 2013  
LM20343 36V, 3A Adjustable Frequency Synchronous Buck Regulator  
Check for Samples: LM20343  
1
FEATURES  
DESCRIPTION  
The LM20343 is a full featured synchronous buck  
regulator capable of delivering up to 3A of load  
current. The current mode control loop is externally  
compensated with only two components, offering both  
high performance and ease of use. The device is  
optimized to work over the input voltage range of  
4.5V to 36V making it well suited for high voltage  
systems.  
2
•
•
•
•
4.5V to 36V Input Voltage Range  
3A Output Current, 5.2A Peak Current  
130 mΩ/110 mΩ Integrated Power MOSFETs  
94% Peak Efficiency with Synchronous  
Rectification  
•
•
1.5% Feedback Voltage Accuracy  
Current Mode Control, Selectable  
Compensation  
The device features internal Over Voltage Protection  
(OVP) and Over Current Protection (OCP) circuits for  
increased system reliability. A precision Enable pin  
and integrated UVLO allows the turn on of the device  
to be tightly controlled and sequenced. Startup inrush  
currents are limited by both an internally fixed and  
externally adjustable soft-start circuit. Fault detection  
and supply sequencing are possible with the  
integrated power good (PGOOD) circuit.  
•
Resistor Programmed, 1MHz Capable  
Oscillator  
•
•
•
Adjustable Output Voltage Down to 0.8V  
Compatible with Pre-biased Loads  
Programmable Soft-start with External  
Capacitor  
•
•
•
Precision Enable Pin with Hysteresis  
OVP, UVLO Inputs and PGOOD Output  
The frequency of this device can be adjusted from  
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  
device can be configured to track a higher voltage rail  
using the SS/TRK pin. If the output of the LM20343 is  
pre-biased at startup it will not sink current to pull the  
output low until the internal soft-start ramp exceeds  
the voltage at the feedback pin.  
•
Accurate Current Limit Minimizes Inductor  
Size  
•
•
Non-linear Current Mode Slope Compensation  
20-Pin HTSSOP Exposed Pad Package  
APPLICATIONS  
The LM20343 is offered in an exposed pad 20-pin  
HTSSOP package that can be soldered to the PCB,  
eliminating the need for bulky heatsinks.  
•
•
•
Simple to Design, High Efficiency Point of  
Load Tegulation from a 4.5V to 36V Bus  
High Performance DSPs, FPGAs, ASICs and  
Microprocessors  
Communications Infrastructure, Automotive  
Simplified Application Circuit  
LM20343  
BOOT  
C
BOOT  
L
V
SW  
V
IN  
OUT  
V
IN  
D1  
(Optional)  
C
IN  
R
R
FB1  
C
OUT  
EN  
FB  
RT  
FB2  
PGOOD  
COMP  
R
RT  
R
C
SS/TRK  
AGND  
VCC  
GND  
C1  
C
VCC  
C1  
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.  
All trademarks are the property of their respective owners.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2008–2013, Texas Instruments Incorporated  
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