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HT7727 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT7727 Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
1 / 15 page HT77XX PFM Step-up DC/DC Converter Selection Table Part No. Output Voltage Package Marking HT7727 2.7V TO-92 SOT-89 SOT-25 HT77XX (for TO-92) HT77XX# (for SOT-89) 77XX# (for SOT-25) HT7730 3.0V HT7733 3.3V HT7737 3.7V HT7750 5.0V Note: ²XX² stands for output voltages. Only lead free devices are available. ²#² stands for lead free devices. For the TO-92 package, there will be a ²#² mark at the end of the date code. Rev 1.10 1 March 7, 2006 Features · Low start-up voltage: 0.6V (Typ.) · High efficiency: 85% (Typ.) · High output voltage accuracy: ±2.5% · Output voltage: 2.7V, 3.0V, 3.3V, 3.7V, 5.0V · Ultra low supply current IDD2:4mA (Typ.) · Low ripple and low noise · Low shutdown current: 0.5mA (Typ.) · TO-92, SOT-89 and SOT-25 package Applications · Palmtops/PDAs · Portable communicators/Smartphones · Cameras/Camcorders · Battery-powered equipment General Description The HT77XX series is a set of PFM step-up DC/DC con- verter with high efficiency and low ripple. The series fea- tures extremely low start-up voltage and high output voltage accuracy. They require only three external com- ponents to provide a fixed output voltage of 2.7V, 3.0V, 3.3V, 3.7V or 5.0V. CMOS technology ensures ultra low supply current and makes them ideal for bat- tery-operated applications powered from one or more cells. The HT77XX consists of an oscillator, a PFM control cir- cuit, a driver transistor, a reference voltage unit, and a high speed comparator. They employ pulse frequency modulation (PFM) for minimum supply current and rip- ple at light output loading. These devices are available in space saving TO-92, SOT-89 and SOT-25 packages. For SOT-25 package, it also build-in a chip enable func- tion to reduce power consumption during shutdown mode. Technical Document · Tools Information · FAQs · Application Note |
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