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LM21212-2

更新时间： 2024-11-24 02:58:19
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12A High Efficiency Synchronous Buck Regulator with Adjustable Switching Frequency

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LM21212-2  
www.ti.com  
SNVS715A –MARCH 2011–REVISED MARCH 2013  
12A High Efficiency Synchronous Buck Regulator with Adjustable Switching Frequency  
Check for Samples: LM21212-2  
1
FEATURES  
DESCRIPTION  
The LM21212-2 is a monolithic synchronous 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 1.55 MHz Resistor-Adjustable  
Frequency  
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 LM21212-2 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 LM21212-2 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 programmed between 300 kHz and 1.55 MHz  
with an external resistor.  
•
•
•
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
V
OUT  
PVIN  
AVIN  
SW  
IN  
C
IN  
R
F
OUT  
4
3
C
C3  
R
R
FB1  
C
F
R
C2  
LM21212-2  
19  
18  
FB  
EN  
C
C1  
R
C1  
optional  
FB2  
COMP  
2
1
SS/  
TRK  
optional  
C
C2  
C
SS  
17  
PGOOD  
FADJ  
R
ADJ  
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  
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