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HT7733

Holtek Semiconductor
Part Number HT7733
Manufacturer Holtek Semiconductor
Description PFM Step-up DC/DC Converter
Published Mar 18, 2010
Detailed Description HT77XX PFM Step-up DC/DC Converter Features · Low start-up voltage: 0.7V (Typ.), 0.9V (Max.) · High efficiency: 85% (Typ...
Datasheet PDF File HT7733 PDF File

HT7733
HT7733

Overview
HT77XX PFM Step-up DC/DC Converter Features · Low start-up voltage: 0.
7V (Typ.
), 0.
9V (Max.
) · High efficiency: 85% (Typ.
), VOUT³2.
7V · High output voltage accuracy: ±2.
5% · Output voltage: 1.
8V, 2.
7V, 3.
0V, 3.
3V, 3.
7V, 5.
0V · Ultra low supply current IDD2: 4mA (Typ.
) · Low ripple and low noise · Low shutdown current: 0.
5mA (Typ.
) · TO-92, SOT-89, SOT-23 and SOT-25 package www.
DataSheet4U.
com Applications · Palmtops/PDAs · Portable communicators/Smartphones · Cameras/Camcorders · Battery-powered equipment General Description The HT77XX 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 1.
8V, 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 HT77XX 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.
HT7718 HT7727 HT7730 HT7733 HT7737 HT7750 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.
Output Voltage 1.
8V 2.
7V 3.
0V 3.
3V 3.
7V 5.
0V TO-92 SOT-89 SOT-23 SOT-25 HT77XX (for TO-92) HT77XX# (for SOT-89) 77XX# (for SOT-23) 77XX# (for SOT-25) Package Marking Block Diagram V re f L X B u ffe r P F M O S C C h ip E n a b le C o n tro l 1 1 5 k H z G N D V O U T C E Rev 1.
60 1 September 12, 2007 HT77XX www.
DataSheet4U.
c...


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