HT77XX(2006) 查看數據表（PDF） - Holtek Semiconductor

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HT77XX
(Rev.:2006)

PFM Step-up DC/DC Converter

Holtek Semiconductor 

HT77XX

PFM Step-up DC/DC Converter

Technical Document

· Tools Information

· FAQs

· Application Note

Features

· Low start-up voltage: 0.6V (Typ.)

· High efficiency: 85% (Typ.)

· High output voltage accuracy: ±2.5%

· Output voltage: 2.7V, 3.0V, 3.3V, 3.7V, 5.0V

Applications

· Palmtops/PDAs

· Portable communicators/Smartphones

· Ultra low supply current IDD2: 4mA (Typ.)

· Low ripple and low noise

· Low shutdown current: 0.5mA (Typ.)

· TO-92, SOT-89 and SOT-25 package

· Cameras/Camcorders

· Battery-powered equipment

General Description

The HT77XX series is a set of PFM step-up DC/DC con-

verter with high efficiency and low ripple. The series fea-

tures extremely low start-up voltage and high output

voltage accuracy. They require only three external com-

ponents 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 bat-

tery-operated applications powered from one or more

cells.

The HT77XX consists of an oscillator, a PFM control cir-

cuit, a driver transistor, a reference voltage unit, and a

high speed comparator. They employ pulse frequency

modulation (PFM) for minimum supply current and rip-

ple at light output loading. These devices are available

in space saving TO-92, SOT-89 and SOT-25 packages.

For SOT-25 package, it also build-in a chip enable func-

tion to reduce power consumption during shutdown

mode.

Selection Table

Part No.

HT7727

HT7730

HT7733

HT7737

HT7750

Output Voltage

2.7V

3.0V

3.3V

3.7V

5.0V

Package

TO-92

SOT-89

SOT-25

Marking

HT77XX (for TO-92)

HT77XX# (for SOT-89)

77XX# (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.

Rev 1.10

1

March 7, 2006

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