The LTC1474/LTC1475 is a high efficiency step-down converter with internal P-channel MOSFET power switches that draw only 10µA typical DC supply current at no load while maintaining output voltage. The LTC1474 uses logic-controlled shutdown while the LTC1475 features pushbutton on/off. The low supply current coupled with Burst ModeTM operation enables the LTC1474/LTC1475 to maintain high efficiency, even with output voltages ranging from 3V to 18V and load currents up to 400mA.
The LTC1474 and LTC1475 are high‑efficiency step‑down converters with internal P‑channel MOSFET switches, offering over 92% efficiency and very low standby current. They operate from 3 V to 18 V input and are available in 3.3 V, 5 V, and adjustable output versions.
The devices include programmable current limiting via an external sense resistor, burst‑mode operation for ultra‑low quiescent current, and a low‑battery comparator with shutdown capability. Pin functions, electrical characteristics, and recommended component selections are provided for designing compact, low‑noise power supplies.
| Efficiency | Over 92% |
|---|---|
| Standby current | 10 µA typ |
| Input voltage range | 3 V to 18 V |
| Output versions | 3.3 V, 5 V, Adjustable |
| Maximum switch current | 750 mA |
The devices have a very low standby current of about 10 µA typical.
It is programmed with an external sense resistor on the SENSE pin; if no resistor is used the default maximum is 400 mA.
The series is offered in fixed 3.3 V, 5 V, and adjustable output versions.