FEATURES
s SMBus/I2CTM Programmable Output Voltage: 1.3V to 3.5V s No Sense Resistor Required s 2% to 90% Duty Cycle at 200kHz s tON(MIN) ≤ 100ns s True Current Mode Control s Stable with Ceramic COUT s Power Good Output Voltage Monitor and 50µs Timer s Wide VIN Range: 4V to 36V (Abs Max) s Precision Resistor Divider and Reference Provide ±1.35% Output Voltage Accuracy Over Temperature s Adjustable Switching Frequency and Current Limit s Forced Continuous Control Pin s Programmable Soft-Start s Output Overvoltage Protection s Optional Short-Circuit Shutdown Timer s Available in a 28-Lead SSOP Package U APPLICATIO S s Power Supplies for DSPs, ASICs, FPGAs and CPUs s Voltage Margining DESCRIPTIO The LTC®1909-8 is a synchronous step-down switching regulator controller with a digitally programmable output voltage. The output voltage is selected from one of two 5-bit settings programmed into internal registers via a 2-wire SMBus/I2C interface. The interface features safeguards against invalid output voltages and allows the microprocessor to turn the regulator on and off.
Linear Technology
