HT7727A

HOLTEK Semiconductor Inc.
HT77xxA PFM Step-up DC/DC Converter Features · Low start-up voltage: 0.7V (Typ.) · High efficiency: 85% (Typ.) · Ultra low supply current IDD: 5mA (Typ.) · Low ripple and low noise · High output voltage accuracy: ±2.5% · Low shutdown current: 0.5mA (Typ.) · Output voltage: 2.7V, 3.0V, 3.3V, 5.0V · Package types: 3-pin SOT89, 3-pin SOT23 and · Output current up to 200mA 5-pin SOT23 packag...
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HT77xxA PFM Step-up DC/DC Converter Features · Low start-up voltage: 0.7V (Typ.) · High efficiency: 85% (Typ.) · Ultra low supply current IDD: 5mA (Typ.) · Low ripple and low noise · High output voltage accuracy: ±2.5% · Low shutdown current: 0.5mA (Typ.) · Output voltage: 2.7V, 3.0V, 3.3V, 5.0V · Package types: 3-pin SOT89, 3-pin SOT23 and · Output current up to 200mA 5-pin SOT23 package Applications · Palmtops/PDAs · Cameras/Camcorders · Portable communicators/Smartphones · 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 components 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 battery-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 ripple at light output loading. These devices are available in space saving 3-pin SOT89, 3-pin SOT23 and 5-pin SOT23 packages. For 5-pin SOT23 package, it also build-in a chip enable function to reduce power consumption during shutdown mode. Selection Table Note: Part No. Output Voltage HT7727A 2.7V HT7730A 3.0V HT7737A 3.7V HT7733A 3.3V HT7750A 5.0V Package Marking SOT89 SOT23 SOT23-5 HT77xxA (for SOT89) 7xxA (for SOT23) 7xxA (for SOT23-5) ²XX² stands for output voltages. Block Diagram V re f L X L X L im ite r O S C 2 0 0 k H z B u ffe r P F M C o n tro l V O U T G N D C h ip E n a b le C E Rev 1.60 1 December 12, 2018 PDF
Документация на HT7750A 

\\tsclient\D\datasht\Power Management\HT77xxA\HT77xxav160-20181212.vp

Дата модификации: 12.12.2018

Размер: 262.1 Кб

13 стр.

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