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.
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.
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
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.
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