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HT7727A Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT7727A Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
1 / 14 page HT77xxA PFM Step-up DC/DC Converter Selection Table Part No. Output Voltage Package Marking HT7727A 2.7V TO92 SOT89 SOT23 SOT23-5 HT77xxA (for TO92) HT77xxA (for SOT89) 7xxA (for SOT23) 7xxA (for SOT23-5) HT7730A 3.0V HT7737A 3.7V HT7733A 3.3V HT7750A 5.0V Note: ²XX² stands for output voltages. Block Diagram Rev 1.40 1 December 3, 2012 Features · Low start-up voltage: 0.7V (Typ.) · High efficiency: 85% (Typ.) · High output voltage accuracy: ±2.5% · Output voltage: 2.7V, 3.0V, 3.3V, 5.0V · Output current up to 200mA · Ultra low supply current IDD:5mA (Typ.) · Low ripple and low noise · Low shutdown current: 0.5mA (Typ.) · TO92, SOT89, SOT23 and SOT23-5 package Applications · Palmtops/PDAs · Portable communicators/Smartphones · Cameras/Camcorders · Battery-powered equipment General Description The HT77xxA series is a set of PFM step-up DC/DC converter with high efficiency and low ripple. The series features 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 HT77xxA consists of an oscillator, a PFM control circuit, 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 TO92, SOT89, SOT23 and SOT23-5 packages. For SOT23-5 package, it also build-in a chip enable function to reduce power consumption during shutdown mode. V O U T G N D V r e f P F M C o n t r o l B u f f e r L X C h i p E n a b l e C E O S C 2 0 0 k H z L X L i m i t e r |
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