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LM20154MH

更新时间： 2024-09-23 12:19:19
品牌 Logo 应用领域
德州仪器 - TI 稳压器
页数 文件大小 规格书
31页 1340K
描述
LM20154/LM20154-Q1 4A, 1MHz Synchronous Buck Regulator with SYNCOUT

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LM20154  
www.ti.com  
SNVS531G –OCTOBER 2007–REVISED MARCH 2013  
LM20154/LM20154-Q1 4A, 1MHz Synchronous Buck Regulator with SYNCOUT  
Check for Samples: LM20154  
1
FEATURES  
DESCRIPTION  
The LM20154 is a full featured 1 MHz 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
•
LM20154-Q1 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  
•
96% Peak Efficiency at 1.0 MHz Switching  
Frequency  
•
•
•
•
•
•
•
•
•
Frequency Synchronization Output  
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 LM20154 features an open drain SYNCOUT pin  
which provides an external clock that matches the  
switching frequency of the device but is shifted by  
180 degrees.  
•
HTSSOP Exposed Pad Package  
APPLICATIONS  
The LM20154 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 LM20154 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.  
•
•
•
Simple to Design, High Efficiency Point of  
Load Regulation from a 5V or 3.3V Bus  
High Performance DSPs, FPGAs, ASICs and  
Microprocessors  
Broadband, Networking and Optical  
Communications Infrastructure  
The LM20154 is offered in an exposed pad 16-pin  
HTSSOP package that can be soldered to the PCB,  
eliminating the need for bulky heatsinks.  
Typical Application Circuit  
L
LM20154  
V
OUT  
SW  
FB  
V
IN  
PVIN  
R
R
FB1  
EN  
C
IN  
R
R
S
F
C
OUT  
AVIN  
FB2  
PGOOD  
VCC  
C
F
SYNCOUT  
COMP  
SYNCOUT  
C
VCC  
SS/TRK  
AGND  
R
C1  
PGND  
C
SS  
(optional)  
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.  
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 © 2007–2013, Texas Instruments Incorporated  
1234567...31

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