DESCRIPTION

The SC2422A biphase, current mode controller is designed to work with Semtech smart synchronous drivers, such as the SC1205, SC1305 or the SC1405 to provide the DC/DC converter solution for the most demanding Micro-processor applications. Input current rather than output current sensing is used to guarantee precision phase to phase current matching using a single sense resistor on the input power line. Accurate current sharing and pulse by pulse current limit are implemented without the power loss and transient response degradation associated with output current sense methods. Two phase operation allows significant reduction in input/output ripple while enhancing transient response.

FEATURES

• Precision, pulse by pulse phase current matching

• Active drooping allows for best transient response

• Input Sensing Current mode control

• Programmable DAC step size/offset allows

Compliance with VRM9.0, VRM8.3 or VRM8.4

• Externally programmable soft-start

• 5V or 12V input for next generation processors

• 0 minimum duty cycle improves transient response

• Externally Programmable UVLO with hysteresis

• Cycle by cycle current limiting

• Programmable Internal Oscillator to 1 MHz

• VID IIIII Inhibit (No CPU)

APPLICATIONS

• Intel Advanced Microprocessors

• AMD AthlonTM power supplies

• Servers/Workstations, high density power supplies