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HT77S11 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT77S11 Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
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1 / 16 page  HT77S10/HT77S11 High Efficiency Synchronous Step-Up DC/DC Converter Selection Table Part No. Current Limit Package HT77S10 1.0A 8MSOP/SOP HT77S11 0.55A Rev. 1.10 1 March 11, 2010 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: 20mA (Typ.) · Low shutdown current: 1mA (Max.) · Built-in voltage detector · 8-pin MSOP/SOP packages Applications · Battery-powered equipment power source · Power source for cameras, camcorders, VCRs, PDAs, pagers, electronic data banks, and hand-held communication equipment · Power source for appliances, which require a higher operating voltage than that of the application batteries General Description The HT77S11 and HT77S10 are high efficiency PFM synchronous step-up DC-DC converters. The two de- vices although functionally similar are different in their output drive current capabilities. Synchronous rectifica- tion operation is used 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. The HT77S11 and HT77S10 have 0.7V start-up voltage, and will consume a typical quiescent current of 20 mA. A shutdown mode is provided whereby the operating cur- rent will be reduced a very low value. The output voltage has two fixed voltages of 3.3V by setting FB to OUT pin and 5V by setting FB to GND pin, but can also be ad- justed between a value of 1.8V~5.5V using two external resistors. With internal voltage detector function, the de- tected voltage can be set by using dividing resistor. |
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Similar Description - HT77S11 |
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