The LM21212-1 is a monolithic synchronous point-of-load buck regulator that is capable of delivering up to 12 A of continuous output current while producing an output voltage down to 0.6 V with outstanding efficiency. The device is optimized to work over an input voltage range of 2.95 V to 5.5 V, 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.
The LM21212-1 features internal overvoltage protection (OVP) and overcurrent protection (OCP) for increased system reliability. A precision enable pin and integrated UVLO allow turnon 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 are possible with the integrated power good circuit.
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 300 kHz to 1.5 MHz.
If the output is prebiased at start-up, it does not sink current, allowing the output to smoothly rise past the prebiased 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 heat sinks.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM21212-1 2.95-V To 5.5-V, 12-A, Voltage-Mode Synchronous Buck Regulator With Frequency Synchronization datasheet (Rev. F) | PDF | HTML | 21 May 2019 |
| Selection guide | Buck Converter Quick Reference Guide (Rev. B) | 08 Apr 2021 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| User guide | AN-2107 LM21212-1 Evaluation Board (Rev. B) | 05 May 2013 |
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This evaluation board provides a solution to examine the high efficiency LM21212-1 buck switching regulator. The LM21212-1 is capable of driving up to 12A of continuous load current with excellent output voltage accuracy due to its ±1% internal reference. This device also features a clock (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 20 | Ultra Librarian |
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