The LT3972 is an adjustable frequency (200kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 33V (62V Maximum). It features high efficiency, low ripple, fast transient response, and low quiescent current. It can also enhance low output current efficiency by reducing the output current.
The LT3972 is a monolithic buck switching regulator that operates from 3.6 V to 33 V (62 V transients) and delivers up to 3.5 A output current. It features a low‑quiescent‑current burst‑mode operation (75 pA at 12 V) and an adjustable switching frequency from 200 kHz to 2.4 MHz. Integrated functions include a boost Schottky diode, power‑good flag, soft‑start, and synchronizable clock input.
Typical applications include automotive battery regulation, distributed supply regulation, industrial supplies, and wall‑transformer regulation. The device is offered in 10‑pin MSOP and 3 mm × 3 mm DFN packages with exposed pads for optimal thermal performance.
| Maximum Output Current | 3.5 A |
|---|---|
| Quiescent Current (Burst Mode) | 75 pA at 12 V input |
| Switching Frequency Range | 200 kHz to 2.4 MHz |
| Output Voltage Range | 0.79 V to 30 V |
| Shutdown Current | < 1 pA |
In burst mode the quiescent current is about 75 pA at a 12 V input.
The switching frequency is adjustable between 200 kHz and 2.4 MHz.