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LM21305

更新时间： 2024-09-17 02:58:27
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德州仪器 - TI /
页数 文件大小 规格书
33页 1419K
描述
5A Adjustable Frequency Synchronous Buck Regulator

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LM21305 数据手册

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LM21305  
www.ti.com  
SNVS639F –DECEMBER 2009–REVISED MARCH 2013  
5A Adjustable Frequency Synchronous Buck Regulator  
Check for Samples: LM21305  
1
FEATURES  
APPLICATIONS  
2
•
•
•
High Efficiency Switcher Core With Integrated  
Low RDSon Power MOSFETs  
•
•
•
POL Regulation From 3.3V, 5V, and 12V  
Supply Rails  
Resistor Programmable Switching Frequency  
With Frequency Synchronization  
High Efficiency Supply for DSPs, FPGAs,  
ASICs and Processors  
Internal Soft-Start With Monotonic and Pre-  
Biased Startup  
Broadband, Networking and Optical  
Communications Infrastructure  
•
•
•
•
•
•
Low Shutdown Quiescent Current  
Precision Enable With Hysteresis  
PGOOD Indicator Function  
DESCRIPTION  
The LM21305 is a full-featured 5A synchronous buck  
POL regulator optimized for solution size, flexibilty,  
and high conversion efficiency. High power density  
LM21305 designs are achieved via monolithic  
integration of the high-side and low-side power  
MOSFETs, high switching frequency, current-mode  
control, and optimized thermal design. The efficiency  
of the LM21305 is elevated at light loads with diode  
emulation mode operation and at heavy loads by  
optimal design of the MOSFET gate drivers to  
minimize switch dead-times and body-diode  
conduction losses.  
Input Under-Voltage Lock-Out (UVLO)  
Output Over-Voltage Protection (OVP)  
High-Bandwidth Load Transient Response  
With Peak Current-Mode Control  
•
•
Cycle-by-Cycle Current Limiting  
Thermal Shutdown  
KEY SPECIFICATIONS  
•
•
•
•
3V to 18V Single-Rail Input Voltage  
0.598V Feedback Voltage Reference  
300 kHz to 1.5 MHz Switching Frequency  
The LM21305 accepts a wide input voltage range of  
3V to 18V, facilitating interface to all intermediate bus  
voltages, including 3.3V, 5V and 12V rails. An output  
voltage as low as 0.598V is supported with excellent  
setpoint accuracy and low ripple and RMS noise.  
WQFN-28 Package (5 x 5 x 0.8 mm, 0.5 mm  
Pitch)  
Typical Application Circuit  
VIN  
PVIN  
CBOOT  
CIN  
RF  
CF  
CBOOT  
VOUT  
0.6V - 5V  
L
SW  
FB  
AVIN  
EN  
RFB1  
REN1  
COUT  
RFB2  
LM21305  
REN2  
Cc1  
Rc  
2V5  
5V0  
C2V5  
COMP  
FREQ  
C5V0  
RPG  
CFRQ  
SYNC  
PGOOD  
AGND PGND  
RFRQ  
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 © 2009–2013, Texas Instruments Incorporated  
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