The document describes a high-performance DC/DC converter designed for high current microprocessors. The device implements a dual-phase step-down controller with a 180° phase-shift between each phase. A precise 5-bit digital to analog converter (DAC) allows adjusting the output voltage from 1.100V to 1.850V with 25mV binary steps. The high precision internal reference assures the selected output voltage to be within ±0.8%. The high peak current gate drive affords to have fast switching to the external power MOS providing low switching losses. The device ensures fast protection against load over current and load over/under voltage. An internal crowbar is provided for overvoltage protection.
The L6917B is a power supply controller specifically designed to provide high-performance DC/DC conversion for high current microprocessors. It implements a dual-phase step-down controller with a 180° phase-shift between each phase, utilizing a precise 5-bit digital to analog converter (DAC) to adjust the output voltage from 1.100V to 1.850V with 25mV binary steps.
The device features high peak current gate drive for fast switching and low switching losses, along with an internal 300 kHz oscillator that can be externally adjusted up to 600 kHz. It includes comprehensive protection mechanisms such as overvoltage protection, overcurrent protection, and a power good output, packaged in an SO-28 format.
| Output Voltage Range | 1.100V to 1.850V |
|---|---|
| Output Voltage Step | 25mV |
| Internal Oscillator Frequency | 300 kHz |
| Maximum Oscillator Frequency | 600 kHz |
| Gate Current | Up to 2A |
| Reference Accuracy | 0.8% |
| Current Sharing Accuracy | 10% |
| Soft-Start Steps | 2048 |
| Package Type | SO-28 |
| Maximum Junction Temperature | 150 °C |
The output voltage can be adjusted from 1.100V to 1.850V using a 5-bit digital to analog converter.
The oscillator frequency is externally adjustable up to 600 kHz by connecting a resistor to the OSC/INH/FAULT pin.
The device provides integrated high current gate drivers with up to 2A gate current.
It is designed for power supplies for servers, workstations, and high current microprocessors.