特点
Input Voltage Range: 2.4V to 6V
Fixed Output Voltages: 1.8V ±4%, 2V ±4%
Output Current: 100mA
No Inductors
Typical Efficiency 25% Higher than LDOs
Low Operating Current: 25μA
Low Shutdown Current: 5μA
600kHz Switching Frequency
Shutdown Disconnects Load from V
IN
Soft-Start Limits Inrush Current at Turn-On
Short-Circuit and Overtemperature Protected
Available in 8-Pin MSOP and SO Packages
典型应用
典型应用
描述
描述 The LTC?1503-1.8/LTC1503-2 are switched capacitor step-down DC/DC converters that produce a regulated output from a 2.4V to 6V input. The parts use switched capacitor fractional conversion to achieve high efficiency over the entire input range. No inductors are required. Internal circuitry controls the step-down conversion ratio to optimize efficiency as the input voltage and load conditions vary. Typical efficiency is 25% higher than that of a low dropout (LDO) linear regulator. Regulation is achieved by sensing the output voltage and enabling the internal switching network as needed to maintain a fixed output voltage. This method of regulation enables the parts to achieve high efficiency at extremely light loads. Low operating current (25μA with no load, 5μA in shutdown) and low external parts count (two 1μF flying capacitors and two 10μF bypass capacitors) make the LTC1503-1.8/LTC1503-2 ideally suited for space constrained battery-powered applications. The parts are fully short-circuit and overtemperature protected. The LTC1503-1.8/LTC1503-2 are available in 8-pin MSOP and SO packages.