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LM20145_15

更新时间： 2024-09-24 00:58:11
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德州仪器 - TI /
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5A PowerWise Adjustable Frequency Synchronous Buck Regulator

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LM20145_15 数据手册

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LM20145  
www.ti.com  
SNVS530E –OCTOBER 2007–REVISED MARCH 2013  
LM20145/LM20145Q 5A, PowerWise® Adjustable Frequency Synchronous Buck Regulator  
Check for Samples: LM20145  
1
FEATURES  
DESCRIPTION  
The LM20145 is a full featured adjustable frequency  
synchronous buck regulator capable of delivering up  
to 5A 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
•
Available in AEC-Q100 Temperature Grade 1  
Input Voltage Range 2.95V to 5.5V  
•
•
Accurate Current Limit Minimizes Inductor  
Size  
•
•
97% Peak Efficiency  
Adjustable Switching Frequency (250 kHz to  
750 kHz)  
•
•
•
•
•
•
•
•
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 LM20145 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 LM20145 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.  
•
HTSSOP 16-Pin Exposed Pad Package  
APPLICATIONS  
•
•
•
Simple to Design, High Efficiency Point of  
Load Regulation from a 5V or 3.3V Bus  
High Performance DSPs, FPGAs, ASICs and  
Microprocessors  
The frequency of this device can be adjusted from  
250 kHz to 750 kHz by connecting an external  
resistor from the RT pin to ground.  
Broadband, Networking and Optical  
Communications Infrastructure  
The LM20145 is offered in a 16-pin HTSSOP  
package with an exposed pad that can be soldered to  
the PCB, eliminating the need for bulky heatsinks.  
Typical Application Circuit  
L
LM20145  
V
OUT  
SW  
V
IN  
PVIN  
R
R
FB1  
EN  
C
IN  
R
F
FB  
C
OUT  
AVIN  
RT  
FB2  
PGOOD  
C
F
R
T
VCC  
COMP  
C
VCC  
SS/TRK  
R
C1  
PGND AGND  
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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