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LM20133Q

更新时间： 2024-11-10 01:06:15
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德州仪器 - TI /
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29页 1380K
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3A, PowerWise Synchronous Buck Regulator with Input Synchronization

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LM20133Q 数据手册

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LM20133, LM20133Q  
www.ti.com  
SNVS526F –OCTOBER 2007–REVISED MARCH 2013  
3A, PowerWise® Synchronous Buck Regulator with Input Synchronization  
Check for Samples: LM20133, LM20133Q  
1
FEATURES  
DESCRIPTION  
The LM20133 is a full featured synchronous buck  
2
•
LM20133Q is AEC-Q100 Qualified and  
regulator capable of delivering up to 3A 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.  
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 Soft-Start with External Capacitor  
Precision Enable Pin with Hysteresis  
Integrated OVP, UVLO, Power Good and  
Thermal Shutdown  
•
HTSSOP 16-Pin Exposed Pad Package  
The switching frequency of the LM20133 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.  
APPLICATIONS  
•
•
•
Simple to Design, High Efficiency Point of  
Load Regulation from a 5V or 3.3V bus  
The LM20133 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 LM20133 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
LM20133  
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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