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LM20242

更新时间： 2024-11-13 11:13:51
品牌 Logo 应用领域
德州仪器 - TI 稳压器
页数 文件大小 规格书
30页 1264K
描述
4.5-36V 2A 电流模式可调频率同步降压稳压器

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LM20242 数据手册

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LM20242  
www.ti.com  
SNVS534E –OCTOBER 2007–REVISED MARCH 2013  
LM20242 36V, 2A PowerWise® Adjustable Frequency Synchronous Buck Regulator  
Check for Samples: LM20242  
1
FEATURES  
DESCRIPTION  
The LM20242 is a full featured 1MHz capable  
synchronous buck regulator capable of delivering up  
to 2A of load current. The current mode control loop  
is externally compensated with only two external  
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.  
23  
•
2A Output Current, 3.7A Peak Current  
130 mΩ/110 mΩ Integrated Power MOSFETs  
1.5% Output Voltage Accuracy  
•
•
•
Current Mode Control, Selectable  
Compensation  
•
Resistor Programmed, 1MHz Capable  
Oscillator  
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 PGOOD circuit.  
•
•
•
•
Synchronous Rectifier with Diode Emulation  
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  
Internally Protected with Peak Current Limit,  
Thermal Shutdown and Restart  
The LM20242 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 LM20242 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 with Frequency  
Foldback  
•
•
Non-Linear Current Mode Slope Compensation  
HTSSOP Exposed Pad Package  
The LM20242 is offered in an exposed pad 20 pin  
HTSSOP package that can be soldered to the PCB,  
eliminating the need for bulky heatsinks.  
APPLICATIONS  
•
•
•
Simple to Design, High Efficiency Point of  
Load Regulation from a 4.5V to 36V Bus  
High Performance DSPs, FPGAs, ASICs and  
Microprocessors  
Communications Infrastructure, Automotive  
Simplified Application Circuit  
LM20242  
BOOT  
L
V
SW  
V
IN  
VIN  
EN  
OUT  
R
FB1  
C
IN  
FB  
C
OUT  
R
FB2  
PGOOD  
RT  
COMP  
R
RT  
R
C1  
SS/TRK  
AGND  
VCC  
GND  
C
VCC  
C
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.  
PowerWise is a registered trademark of Deere and Company.  
2
3
All other trademarks are the property of their respective owners.  
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 © 2007–2013, Texas Instruments Incorporated  
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