The HT77xxS PFM DC/DC Step-up Converter
●Introduction
■The HT77xxS is a series of high-efficiency PFM DC/DC synchronous step-up converters, which can use both multi-layer and wire-wound inductor types. This series has the advantages of low start-up voltage and high-accuracy output voltage and uses CMOS technology to ensure that the supply current is kept ultra-low. It can use smaller value capacitors and inductors due to its high operating frequency of up to 500kHz. Its high operating frequency also greatly reduces audio noise. Additionally, this series provides a range of 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V and 5.0V output voltages with only three external components.
■The HT77xxS devices include an internal oscillator, a PFM control circuit, driver transistor, a reference voltage circuit and a high speed comparator. It uses pulse frequency modulation to keep the supply current to a minimum and also has light-load minimum ripple current. It is supplied in four package types, namely TO92, SOT89, SOT23 and SOT23-5. The SOT23-5 type has an enable control, which gives very low power losses in the power-down mode.
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Datasheet |
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Please see the document for details |
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TO92;SOT89;SOT23;SOT23-5 |
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English Chinese Chinese and English Japanese |
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2019/08/10 |
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AN0298E |
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669 KB |
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