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LTC1701 - 1MHz Step-Down DC/DC Converter in SOT-23

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 0.28 Ohm switch allows up to 0.5A of output current at high efficiency. OPTI-LOOP™ compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

The LTC1701 incorporates automatic power saving BurstMode™ 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 complete DC/DC converter function to consume less than 0.3 square inches of PC board area.

特点 Tiny 5-Lead SOT-23 Package Uses Tiny Capacitors and Inductor High Frequency Operation: 1MHz High Output Current: 500mA Low RDS(ON) Internal Switch: 0.28 Ohms High Efficiency: Up to 94% Current Mode Operation for Excellent Line and Load Transient Response Short-Circuit Protected Low Quiescent Current: 135µA (LTC1701) Low Dropout Operation: 100% Duty Cycle Ultralow Shutdown Current: IQ < 1µA Peak Inductor Current Independent of Inductor Value Output Voltages from 5V Down to 1.25V 典型应用

应用 PDAs/Palmtop PCs Digital Cameras Cellular Phones Portable Media Players PC Cards Handheld Equipment 封装信息

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