The LTC®3605 is a high efficiency, monolithic synchronous step-down switching regulator that is capable of delivering 5A of continuous output current from input voltages of 4V to 15V.
This document is an application note (Design Note 467) by Tom Gross for the Linear Technology LTC3605. It details the device's capabilities as a high-efficiency, monolithic synchronous step-down switching regulator that delivers up to 5A of continuous output current from input voltages between 4V and 15V.
The note highlights the LTC3605's compact 4mm x 4mm QFN package with low thermal impedance, eliminating the need for a heat sink. It explains the device's unique controlled on-time/constant frequency architecture, which is ideal for low duty cycle applications and high-frequency operation up to 4MHz. The document also covers parallel operation capabilities, where multiple LTC3605 devices can be used in an out-of-phase configuration (PolyPhase) to increase total output current and reduce input/output ripple.
| Output Current | 5A continuous |
|---|---|
| Input Voltage Range | 4V to 15V |
| Package Size | 4mm x 4mm QFN |
| Switching Frequency Range | 800kHz to 4MHz |
Yes, its compact QFN package has very low thermal impedance allowing it to deliver maximum power without a heat sink.
The switching frequency is programmable from 800kHz to 4MHz or can be synchronized to an external clock.
Yes, multiple devices can run in parallel and out of phase to increase available output current.