The LTC3425 is a 4-phase monolithic synchronous boost converter with an output voltage range of 2.4V to 5.25V, making it well suited for battery-powered applications as well as point-of-load regulation in low voltage systems. The device has a peak current capability of 5A and an effective switch RDS(ON) of 40mΩ (NMOS) and 50mΩ (PMOS), and is capable of efficiently delivering 2.5A load current from a 0.8mm maximum profile, 32-pin 5mm × 5mm QFN package.
This document describes the LTC3425, an industry-first 4-phase monolithic synchronous boost converter designed for battery-powered and point-of-load regulation applications. It features an effective switching frequency up to 8MHz, allowing the use of low-profile components even at high load currents.
The device includes integrated output disconnect to eliminate startup inrush current and supports multiple operating modes such as automatic Burst Mode, fixed frequency with forced continuous conduction, and pulse skipping. Key specifications include a quiescent current of 12uA in Burst Mode and less than 1pA in shutdown.
| Switching Frequency (Effective) | up to 8MHz |
|---|---|
| Input Voltage Range | 1V to 4.5V |
| Output Voltage Range | 2.4V to 5.25V |
| Load Current Capability | 2.5A |
| Peak Current Capability | 5A |
| Shutdown Quiescent Current | < 1pA |
It uses a 32-pin 5mm x 5mm QFN package with a maximum profile of 0.8mm.
Yes, integrated output disconnect allows VOUT to go to OV in shutdown while eliminating high inrush current.
It supports automatic Burst Mode, fixed frequency mode with forced continuous conduction, and fixed frequency mode with pulse skipping.