The SC1155 is a programmable synchronous DC/DC hysteretic controller designed for use in single ended power supply applications where efficiency is the primary concern. The controller is a hysteretic type, with a user selectable hysteresis. The SC1155 is ideal for implementing DC/DC converters needed to power advanced microprocessors such as Pentium® III and Athlon®, in both single and multiple processor configurations. Inhibit, under-voltage lockout and soft-start functions are included for controlled power-up.
The SC1155 is a synchronous-buck switch-mode controller designed for single-ended power supply applications where efficiency is the primary concern. It features a user-selectable hysteresis and is ideal for powering advanced microprocessors such as Pentium III and Athlon in both single and multiple processor configurations.
Key features include an integrated 5-bit D/A converter allowing programmability of output voltage from 1.1V to 1.85V, a temperature-compensated voltage reference, current limit comparator, over-current protection, and an adaptive deadtime circuit. The device also provides power good signaling, logic-compatible shutdown, and over-voltage protection.
| Supply Voltage Range | 11.4V to 13V |
|---|---|
| Operating Junction Temperature | 0°C to +125°C |
| Output Voltage Range | 1.1V to 1.85V |
| Peak Output Current (High/Low Side) | 2A |
| Efficiency | Up to 95% |
The integrated D/A converter allows programming of the output voltage from 1.1V to 1.85V in 25mV increments.
The high and low side MOSFET drivers have a peak current rating of 2 amps.