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LTC3711 - 5-Bit Adjustable, Wide Operating Range, No RSENSE Step-Down Controller

The LTC3711 is a synchronous step-down switching regulator controller for CPU power. An output voltage between 0.925V and 2.000V is selected by a 5-bit code (Intel mobile VID specification). The controller uses a valley current control architecture to deliver very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT.

Discontinuous mode operation provides high efficiency operation at light loads. A forced continuous control pin reduces noise and RF interference and can assist secondary winding regulation by disabling discontinuous mode operation when the main output is lightly loaded.

Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit level is user programmable. Wide supply range allows operation from 4V to 36V at the input.

Features 5-Bit Programmable Output Voltage: 0.925V to 2V No Sense Resistor Required True Current Mode Control 2% to 90% Duty Cycle at 200kHz tON(MIN) < 100ns Supports Active Voltage Positioning Extremely Fast Transient Response Stable with Ceramic COUT Dual N-Channel MOSFET Synchronous Drive Power Good Output Voltage Monitor Wide VIN Range: 4V to 36V ±1% 0.8V Reference Adjustable Current Limit Adjustable Switching Frequency Programmable Soft-Start Output Overvoltage Protection Optional Short-Circuit Shutdown Timer Micropower Shutdown: IQ < 30µA Available in 24-Lead Narrow SSOP Package Typical Application

Applications Power Supplies for Mobile Pentium® Processors Notebook and Palmtop Computers, PDAs Packaging

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