MAX1730
19-1618; Rev 0; 4/00
50mA Regulated Step-Down Charge Pump for 1.
8V or 1.
9V Logic
General Description
The MAX1730 regulated step-down charge pump generates up to 50mA at fixed output voltages of 1.
8V or 1.
9V from an input voltage in the 2.
7V to 5.
5V range.
Specifically designed to provide high-efficiency logic supplies in applications that demand a compact design, the MAX1730 employs fractional conversion techniques to provide efficiency exceeding that of a linear
regulator.
The MAX1730 operates at up to 2MHz, permitting the use of small 0.
22µF flying capacitors while maintaining low 75µA quiescent supply current.
Proprietary softstart circuitry prevents excessive current from bein...