EL7560
Programmable CPU Power Supply Unit

Key Features

• 3.3V @ 12.4amps continuous
• Internal FETs
• >90% efficiency
• Synchronous switching
• 4-bit digitally adjustable output voltage
• User adjustable slope compensation
• Internal soft start
• Over temperature indicator
• Low current sleep mode
• Low parts count
• Pulse by pulse current limiting
• High efficiency at light load
• Operates up to 1MHz
• 1% output accuracy
• Sync function
• Power good signal

Description

The EL7560 is the simplest, most cost effective method for powering modern high power CPUs which require a user adjustable output voltage. Although it is particularly designed to function with next generation CPUs, its simple design can provide low cost solutions for any 5V to 3V application.

The circuit uses on chip resistorless current sensing for high efficiency, stable current mode control. An on chip temperature sensor resets the OT pin. The OT pin can be tied directly to the OUTEN pin for automatic overtemperature shutdown. The user can adjust the oscillator frequency as well as the slope compensation.

The output voltage is adjustable using a 4-bit parallel interface. A power OK signal "PWRGD' pulls high when the FB pin is within -7% of the programmed value.

Applications

• PC motherboards
• Local high power CPU supplies