SC2422A Datasheet | SEMTECH

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. The DAC step size and range are programmable with external ponents thus allowing pliance with new and emerging VID ranges. A novel approach implements active droop, minimizing output capacitor requirements during load transients. This avoids the pitfalls of the passive droop implementation. This feature also allows easy implementation of N+1 redundancy and current sharing among modules. Programmable Under Voltage Lockout assures proper start-up and shutdown by synchronizing the controller to the driver supply. Wide PWM frequency range allows use of low profile, surface mount ponents. 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 pliance 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 TM AMD Athlon power supplies Servers/Workstations, high density power supplies ORDERING INFORMATION DEVICE (1) PACKAGE...