特点
Tiny 5-Lead SOT-23 Package
Uses Tiny Capacitors and Inductor
High Frequency Operation: 1MHz
High Output Current: 500mA
Low R
DS(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: I
Q
< 1μA
Peak Inductor Current Independent of Inductor Value
Output Voltages from 5V Down to 1.25V
典型应用
典型应用
描述
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.
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