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LM20134

更新时间： 2024-11-09 12:18:39
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德州仪器 - TI 稳压器
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31页 1332K
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LM20134/LM20134Q 4A, PowerWise Synchronous Buck Regulator with Input

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LM20134, LM20134Q  
www.ti.com  
SNVS527G –OCTOBER 2007–REVISED MARCH 2013  
LM20134/LM20134Q 4A, PowerWise® Synchronous Buck Regulator with Input  
Synchronization  
Check for Samples: LM20134, LM20134Q  
1
FEATURES  
DESCRIPTION  
The LM20134 is a full featured synchronous buck  
regulator capable of delivering up to 4A of continuous  
output current. The current mode control loop can be  
compensated to be stable with virtually any type of  
output capacitor. For most cases, compensating the  
device only requires two external components,  
providing maximum flexibility and ease of use. The  
device is optimized to work over the input voltage  
range of 2.95V to 5.5V making it suited for a wide  
variety of low voltage systems.  
2
•
LM20134Q is AEC-Q100 Qualified and  
Manufactured on an Automotive Grade Flow  
•
•
Input Voltage Range 2.95V to 5.5V  
Accurate Current Limit Minimizes Inductor  
Size  
•
•
•
•
•
•
•
•
•
•
97% Peak Efficiency  
Frequency Synchronization Pin  
32 mΩ Integrated FET Switches  
Starts up into Pre-Biased Loads  
Output Voltage Tracking  
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. Start-up  
inrush currents are limited by both an internally fixed  
and externally adjustable Soft-Start circuit. Fault  
detection and supply sequencing is possible with the  
integrated power good circuit.  
Peak Current Mode Control  
Adjustable Output Voltage Down to 0.8V  
Adjustable Soft-Start with External Capacitor  
Precision Enable Pin with Hysteresis  
Integrated OVP, UVLO, Power Good and  
Thermal Shutdown  
The switching frequency of the LM20134 can be  
synchronized to an external clock by use of the  
SYNC pin. The SYNC pin is capable of synchronizing  
to input signals ranging from 500 kHz to 1.5 MHz  
•
HTSSOP 16-Pin Exposed Pad Package  
APPLICATIONS  
•
•
•
Simple to Design, High Efficiency Point of  
Load Regulation from a 5V or 3.3V Bus  
The LM20134 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 LM20134 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.  
High Performance DSPs, FPGAs, ASICs and  
Microprocessors  
Broadband, Networking and Optical  
Communications Infrastructure  
Typical Application Circuit  
L
LM20134  
V
OUT  
SW  
FB  
V
IN  
PVIN  
R
R
FB1  
EN  
C
IN  
R
F
C
OUT  
AVIN  
FB2  
PGOOD  
VCC  
SYNC  
COMP  
C
F
C
VCC  
SS/TRK  
AGND  
R
C1  
PGND  
C
SS  
C
C1  
(optional)  
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.  
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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LM20134 替代型号

型号 品牌 替代类型 描述 数据表
LM20133 TI

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