HT77S10/HT77S11 -- High Efficiency Synchronous Step-up DC/DC Converter

　　General Description

　　The HT77S11 and HT77S10 are high efficiency PFM synchronous step-up DC-DC converters. The two devices although functionally similar are different in their output drive current capabilities. Synchronous rectification operation is uesed to increase device efficiency and to reduce the external component resulting in reduced product costs. The converter switching frequency, which can have a value up to 500KHz, will vary according to the load demands and according to the input voltage to keep the output voltage at the required level.

　　Features

　　Low start-up voltage: 0.7V (Typ.)

　　High efficiency: HT77S10:91% (Typ.)

　　at IOUT=200mA, VIN=2.4V, VOUT=3.3V

　　High output voltage accuracy: ±4%

　　Output voltage: 3.3V, 5.0V or Adjustable

　　Low ripple and low noise

　　Ultra low supply current: 20μA (Typ.)

　　Low shutdown current: 1μA (Max.)

　　Built-in voltage detector

　　8-pin MSOP/SOP packages