DESCRIPTION
The LTC®3620 is a high efficiency, synchronous buck regulator, suitable for very low power, very small footprint applications powered by a single Li-Ion battery.
The internal synchronous switches increase efficiency and eliminate the need for external Schottky diodes. Low output voltages are easily supported by the 0.6V feedback reference voltage. The LTC3620-1 option is internally programmed to provide a 1.1V output.

FEATURES
■ High Efficiency: Up to 95%
■ Maximum Current Output: 15mA
■ Externally Programmable Frequency Clamp with
   Internal 50kHz Default Minimizes Audio Noise
■ 18μA IQ Current
■ 2.9V to 5.5V Input Voltage Range
■ Low-Battery Detection
■ 0.6V Reference Allows Low Output Voltages
■ Shutdown Mode Draws <1μA Supply Current
■ 2.8V Undervoltage Lockout
■ Unique Low Noise Control Architecture
■ Internal Power MOSFETs
■ No Schottky Diodes Required
■ Internal Soft-Start
■ Tiny 2mm × 2mm 8-Lead DFN Package

APPLICATIONS
■ Hearing Aids
■ Wireless Headsets
■ Li-Ion Cell Applications
■ Button Cell Replacement