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LM21212-1

更新时间： 2024-11-07 11:07:55
品牌 Logo 应用领域
德州仪器 - TI 开关控制器开关式稳压器开关式控制器电源电路开关式稳压器或控制器
页数 文件大小 规格书
33页 1074K
描述
具有频率同步功能的 2.95-5.5V、12A、电压模式同步降压稳压器

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LM21212-1 数据手册

 浏览型号LM21212-1的Datasheet PDF文件第2页浏览型号LM21212-1的Datasheet PDF文件第3页浏览型号LM21212-1的Datasheet PDF文件第4页浏览型号LM21212-1的Datasheet PDF文件第5页浏览型号LM21212-1的Datasheet PDF文件第6页浏览型号LM21212-1的Datasheet PDF文件第7页 
LM21212-1  
www.ti.com  
SNVS671E –FEBRUARY 2011–REVISED MARCH 2013  
12A High Efficiency Synchronous Point of Load Buck Regulator with Frequency  
Synchronization  
Check for Samples: LM21212-1  
1
FEATURES  
DESCRIPTION  
The LM21212-1 is a monolithic synchronous point of  
load buck regulator that is capable of delivering up to  
12A of continuous output current while producing an  
output voltage down to 0.6V with outstanding  
efficiency. The device is optimized to work over an  
input voltage range of 2.95V to 5.5V, making it suited  
for a wide variety of low voltage systems. The voltage  
mode control loop provides high noise immunity,  
narrow duty cycle capability and can be compensated  
to be stable with any type of output capacitance,  
providing maximum flexibility and ease of use.  
2
•
Integrated 7.0 mΩ High Side and 4.3 mΩ Low  
Side FET Switches  
•
•
300 kHz to 1.5 MHz Frequency SYNC pin  
Adjustable Output Voltage From 0.6V to VIN  
(100% duty cycle capable), ±1% Reference  
•
•
•
•
•
•
•
Input Voltage Range 2.95V to 5.5V  
Startup Into Pre-Biased Loads  
Output Voltage Tracking Capability  
Wide Bandwidth Voltage Loop Error Amplifier  
Adjustable Soft-Start With External Capacitor  
Precision Enable Pin With Hysteresis  
The LM21212-1 features internal over voltage  
protection (OVP) and over-current protection (OCP)  
for increased system reliability. A precision enable pin  
and integrated UVLO allow turn-on of the device to  
be tightly controlled and sequenced. Startup inrush  
currents are limited by both an internally fixed and  
externally adjustable soft-start circuit. Fault detection  
and supply sequencing are possible with the  
integrated power good circuit.  
Integrated OVP, OCP, OTP, UVLO and Power-  
Good  
•
Thermally Enhanced HTSSOP-20 Exposed Pad  
Package  
APPLICATIONS  
The LM21212-1 is designed to work well in multi-rail  
power supply architectures. The output voltage of the  
device can be configured to track an external voltage  
rail using the SS/TRK pin. The switching frequency  
can be synchronized to the falling edge of a clock  
between frequencies of 300kHz to 1.5MHz.  
•
•
•
Broadband, Networking and Wireless  
Communications  
High-Performance FPGAs, ASICs and  
Microprocessors  
Simple to Design, High Efficiency Point of  
Load Regulation From a 5V or 3.3V Bus  
If the output is pre-biased at startup, it will not sink  
current, allowing the output to smoothly rise past the  
pre-biased voltage. The regulator is offered in a 20-  
pin HTSSOP package with an exposed pad that can  
be soldered to the PCB, eliminating the need for  
bulky heatsinks.  
SIMPLIFIED APPLICATION CIRCUIT  
HTSSOP-20  
L
OUT  
C
5,6,7  
11-16  
V
PVIN  
AVIN  
SW  
V
OUT  
IN  
C
IN  
R
F
OUT  
4
3
C
C3  
R
R
FB1  
C
F
R
C2  
LM21212-1  
19  
18  
FB  
EN  
C
C1  
R
C1  
optional  
optional  
COMP  
FB2  
2
1
SS/  
TRK  
C
C
C2  
SS  
17  
PGOOD  
SYNC  
PGND AGND  
8,9,10  
20  
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 © 2011–2013, Texas Instruments Incorporated  
1234567...33

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