LTC1701 Datasheet | Linear Technology

LTC1701/LTC1701B 1MHz Step-Down DC/DC Converters in SOT-23 Features s Tiny 5-Lead SOT-23 Package s Uses Tiny Capacitors and Inductor s High Frequency Operation: 1MHz s High Output Current: 500m A s Low RDS(ON) Internal Switch: 0.28Ω s High Efficiency: Up to 94% s Current Mode Operation for Excellent Line and Load Transient Response s Short-Circuit Protected s Low Quiescent Current: 135µA (LTC1701) s Low Dropout Operation: 100% Duty Cycle s Ultralow Shutdown Current: IQ < 1µA s Peak Inductor Current Independent of Inductor Value s Output Voltages from 5V Down to 1.25V U APPLICATIO S s PDAs/Palmtop PCs s Digital Cameras s Cellular Phones s Portable Media Players s PC Cards s Handheld Equipment DESCRIPTIO The LTC®1701/LTC1701B are the industry’s first SOT-23 step-down, current mode, DC/DC converters. Intended for low to medium power applications, they operate from 2.5V to 5.5V input voltage range and switch at 1MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. The output voltage is adjustable from 1.25V to 5V. A built-in 0.28Ω switch allows up to 0.5A of output current at high efficiency. OPTI-LOOPTM pensation allows the transient response to be optimized over a wide range of loads and output capacitors. The LTC1701 incorporates automatic power saving Burst Mode TM operation to reduce gate charge losses when the load current drops below the level required for continuous operation. The LTC1701B operates continuously to very low load currents to provide low ripple at the expense of light load efficiency. With no load, the LTC1701 draws only 135µA. In shutdown, both devices draw less than 1µA, making them ideal for current sensitive applications. Their small size and switching frequency enables a plete DC/DC converter function to consume less than 0.3 square inches of PC board area. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode and OPTI-LOOP are trademarks of Linear Technology...