LTC3425 is a synchronous, 4-phase boost converter with output disconnect capable of operation below 1V input. It includes four N-channel MOSFET switches and four P-channel synchronous rectifiers for an effective RDS(ON) of 0.045Ω and 0.05Ω, respectively. 4-phase operation greatly reduces peak inductor currents, and capacitor ripple current, and increases effective switching frequency, minimizing inductor and capacitor sizes. True output disconnect eliminates inrush current and allows zero load current in shutdown. External Schottky diodes are not required.
The LTC3425 is a synchronous 4‑phase boost converter designed for high‑efficiency step‑up applications. It features up to 95 % efficiency, up to 3 A continuous output current, and an adjustable output voltage range of 2.4 V to 5.25 V.
The device is offered in a compact 5 mm × 5 mm 32‑lead plastic QFN package and includes built‑in output disconnect, burst mode operation, and programmable frequency from 100 kHz to 2 MHz per phase. Typical applications include handheld computers and point‑of‑load regulators.
| Input Voltage Range | 0.5 V to 4.5 V |
|---|---|
| Adjustable Output Voltage | 2.4 V to 5.25 V |
| Maximum Continuous Output Current | Up to 3 A |
| Efficiency | Up to 95 % |
| Quiescent Current | 12 µA |
| Frequency Range (per phase) | 100 kHz to 2 MHz |
| Package | 32‑lead 5 mm × 5 mm plastic QFN |
The LTC3425 operates from 0.5 V to 4.5 V input.
It can deliver up to 3 A of continuous output current.
The device is supplied in a 32‑lead 5 mm × 5 mm plastic QFN package.
The converter achieves up to 95 % efficiency.