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HOLTEK_HT7750 直流稳压电源设计
HT77XX
PFM Step-up DC/DC Converter
Technical Document
Tools Information
FAQs
Application Note
Features
Low start-up voltage: 0.6V (Typ.) Ultra low supply current IDD2: 4A (Typ.)
High efficiency: 85% (Typ.) Low ripple and low noise
High output voltage accuracy: 2.5% Low shutdown current: 0.5A (Typ.)
Output voltage: 2.7V, 3.0V, 3.3V, 3.7V, 5.0V TO-92, SOT-89 and SOT-25 package
Applications
Palmtops/PDAs Cameras/Camcorders
Portable communicators/Smartphones Battery-powered equipment
General Description
The HT77XX series is a set of PFM step-up DC/DC con- The HT77XX consists of an oscillator, a PFM control cir-
verter with high efficiency and low ripple. The series fea- cuit, a driver transistor, a reference voltage unit, and a
tures extremely low start-up voltage and high output high speed comparator. They employ pulse frequency
voltage accuracy. They require only three external com- modulation (PFM) for minimum supply current and rip-
ponents to provide a fixed output voltage of 2.7V, 3.0V, ple at light output loading. These devices are available
3.3V, 3.7V or 5.0V. CMOS technology ensures ultra low in space saving TO-92, SOT-89 and SOT-25 packages.
supply current and makes them ideal for bat- For SOT-25 package, it also build-in a chip enable func-
tery-operated applications powered from one or more tion to reduce power consumption during shutdown
cells. mode.
Selection Table
Part No. Output Voltage Package Marking
HT7
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