This document introduces the features of the LTC®3773 switching regulator. It is a 3-phase, triple output synchronous buck controller with built-in gate drivers, packaged in either a 5mm × 7mm QFN or a 36-pin SSOP. Its switching frequency can be set to 220kHz, 400kHz or 560kHz, or it can be synchronized to an external clock between 160kHz and 700kHz. The controller can step down from input voltages as high as 36V and the output voltage can be programmed from 0.6V to 5V.
The document is an advertisement and design note (DN-409) for the Linear Technology LTC3773 switching regulator. It highlights how this 3-phase, triple-output synchronous buck controller saves space and improves performance in high-density applications such as telecommunications and server systems.
Key features discussed include a selectable switching frequency of 220kHz, 400kHz, or 560kHz (or synchronized to an external clock), input voltage support up to 86V, and programmable output voltages from 0.6V to 5V. The note details the benefits of triple-phase operation, such as reduced input capacitor ripple current by over 50% and faster load step response compared to single-phase designs.
| Product Type | 3-phase, triple output synchronous buck controller |
|---|---|
| Switching Frequency Options | 220kHz, 400kHz or 560kHZz |
| External Clock Range | 160kHz and 700kHz |
| Maximum Input Voltage | 86V |
| Output Voltage Range | 0.6V to 5V |
| Maximum Output Current per Rail | 5A |
| Typical Efficiency | up to 93% |
The controller can be set to switch at 220kHz, 400kHz, or 560kHz, or synchronized to an external clock.
The LTC3773 can step down from input voltages as high as 86V.
It reduces the input capacitor ripple current by over 50% and results in a faster load step response.