The LTC3811 is a high accuracy, high bandwidth, dual output, fixed frequency current mode DC/DC switching regulator controller designed for one of today’s most demanding power supply applications: high current, low voltage processor core supplies.
This document is a design note (DN-434) detailing the features and application of the Linear Technology LTC3811. It describes a dual output, fixed frequency current mode DC/DC switching regulator controller designed for demanding power supply applications requiring high current and low voltage processor core supplies.
The text highlights the device's ability to handle supply currents in excess of 100A with voltages as low as 1V. Key features include an output voltage tolerance of +0.5% over temperature, a low minimum on-time allowing switching frequencies up to 750kHz, and support for differential remote sensing and inductor DCR sensing.
| Output Voltage Tolerance | +0.5% over temperature |
|---|---|
| Maximum Switching Frequency | up to 750kHz |
| Supply Current Requirement | in excess of 100A |
| Minimum Output Voltage | as low as 1V |
| Input Voltage Range | 4.5V to 30V |
| Package Options | 38-pin QFN and 36-pin SSOP |
It is designed for high current, low voltage processor core supplies.
Yes, it contains a PLL with an input range of 50kHz to 900kHz for noise-sensitive applications.
It is available in a 38-pin QFN and a 36-pin SSOP.