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HT7730A

Holtek Semiconductor
Part Number HT7730A
Manufacturer Holtek Semiconductor
Description PFM Step-up DC/DC Converter
Published Apr 27, 2016
Detailed Description HT77XXA PFM Step-up DC/DC Converter Features · Low start-up voltage: 0.7V (Typ.) · High efficiency: 85% (Typ.) · High o...
Datasheet PDF File HT7730A PDF File

HT7730A
HT7730A

Overview
HT77XXA PFM Step-up DC/DC Converter 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 · Ultra low supply current IDD: 5mA (Typ.
) · Low ripple and low noise · Low shutdown current: 0.
5mA (Typ.
) · TO-92, SOT-89, SOT-23 and SOT-25 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 components to provide a fixed output voltage of 2.
7V, 3.
0V, 3.
3V 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 TO-92, SOT-89, SOT-23 and SOT-25 packages.
For SOT-25 package, it also build-in a chip enable function to reduce power consumption during shutdown mode.
Selection Table Part No.
HT7727A HT7730A HT7733A HT7750A Output Voltage 2.
7V 3.
0V 3.
3V 5.
0V Package TO-92 SOT-89 SOT-23 SOT-25 Marking HT77XXA (for TO-92) HT77XXA# (for SOT-89) 77XXA# (for SOT-23) 77XXA# (for SOT-25) 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.
Block Diagram L X L X L im ite r O S C 2 0 0 k H z VO UT V re f B u ffe r P F M C o n tro l C h ip E n a b le CE GND Rev 1.
10 1 September 26, 2007 HT77XXA Pin Assignment T O -9 2 S O T -8 9 H T77X X A 123 F r o n t V ie w H T77...


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