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.
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.
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.
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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|Regulated Outputs (#)|
|Vin (Min) (V)|
|Vin (Max) (V)|
|Vout (Min) (V)|
|Vout (Max) (V)|
|Iout (Max) (A)|
|Switching Frequency (Max) (kHz)|
|Switch Current Limit (Typ) (A)|
|Iq (Typ) (mA)|
|Duty Cycle (Max) (%)|
|Vref Accuracy (Typ) (%)|
|Operating Temperature Range (C)|
|Approx. Price (US$)|
| Enable |
| Enable |
| Adjustable Current Limit |
| Enable |
|Voltage Mode||Voltage Mode||Voltage Mode||Voltage Mode|
|-40 to 125||-40 to 125||-40 to 125||-40 to 125|
|3.30 | 1ku||3.30 | 1ku||3.55 | 1ku||3.55 | 1ku|
|Sample & Buy||Sample & Buy||Sample & Buy||Sample & Buy|
|Part #||Name||Product Family||Comments|
|LM21212-2||2.95-5.5V, 12A, Voltage Mode Synchronous Point of Load Buck Regulator with Adjustable Frequency||CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER|
|LM21215||2.95-5.5V, 15A, Voltage Mode Synchronous Buck Regulator||CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER|
|LM21215A||2.95-5.5V, 15A, Voltage Mode Synchronous Buck Regulator with Frequency Synchronization||CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER|
|LM10011||1% Accuracy 4/6-Bit VID Voltage Programmer for Point of Load Regulator w/ Adj Start-Up Current||POWER SUPPLY SUPPORT - FEEDBACK SIGNAL GENERATOR|