LTC1735-1 Datasheet | Linear Technology

Features s s s s s s s s s s s LTC1735-1 High Efficiency Synchronous Step-Down Switching Regulator DESCRIPTIO The LTC®1735-1 is a synchronous step-down switching regulator controller optimized for CPU power. OPTI-LOOP pensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The operating frequency (synchronizable up to 500k Hz) is set by an external capacitor allowing maximum flexibility in optimizing efficiency. The output voltage is monitored by a power good window parator that indicates when the output is within 7.5% of its programmed value, conforming to Intel Mobile CPU Specifications. Protection Features include internal foldback current limiting, output overvoltage crowbar and optional shortcircuit shutdown. Soft-start is provided by an external capacitor that can be used to properly sequence supplies. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 30V (36V maximum). Pin defeatable Burst Mode TM operation provides high efficiency at low load currents while 99% duty cycle provides low dropout operation. s s s s U APPLICATIO S s s Dual N-Channel MOSFET Synchronous Drive Programmable/Synchronizable Fixed Frequency VOUT Range: 0.8V to 7V Wide VIN Range: 3.5V to 36V Operation Very Low Dropout Operation: 99% Duty Cycle OPTI-LOOPTM pensation Minimizes COUT ±1% Output Voltage Accuracy Power Good Output Voltage Monitor Internal Current Foldback Output Overvoltage Crowbar Protection Latched Short-Circuit Shutdown Timer with Defeat Option Optional Programmable Soft-Start Remote Output Voltage Sense Logic Controlled Micropower Shutdown: IQ < 25µA Available in 16-Lead Narrow SSOP and SO Packages s Notebook and Palmtop puters, PDAs Power Supply for Mobile Pentium® III Processor with Speed Step TM Technology Cellular Telephones and Wireless Modems , LTC and LT are registered trademarks of Linear Technology...