Datasheet > HT7718_10

HT7718_10

更新时间： 2024-09-21 11:00:07

品牌	Logo	应用领域
台湾合泰/盛群 - HOLTEK		转换器
页数	文件大小	规格书
19页	464K
描述
PFM Asynchronous Step-up DC to DC Converter (100mA)

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HT7718_10 数据手册

HT77XX

PFM Asynchronous Step-up DC to DC Converter (100mA)

Features

Low start-up voltage: 0.7V (Typ.), 0.9V (Max.)

High efficiency: 85% (Typ.), V_OUT³2.7V

High output voltage accuracy: ±2.5%

Output current up to 100mA

Ultra low supply current I_DD2: 4mA (Typ.)

Low ripple and low noise

Output voltage: 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V,

5.0V

Low shutdown current: 0.5mA (Typ.)

TO92, SOT89, SOT23 and SOT23-5 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-

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 1.8V, 2.2V,

2.7V, 3.0V, 3.3V, 3.7V or 5.0V. CMOS technology en-

sures 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 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 TO92, SOT89, SOT23 and SOT23-5

packages. For SOT23-5 package, it also build-in a chip

enable function to reduce power consumption during

shutdown mode.

Selection Table

Part No.

HT7718

HT7722

HT7727

HT7730

HT7733

HT7737

HT7750

Output Voltage

1.8V

Package

Marking

2.2V

HT77XX (for TO92)

HT77XX# (for SOT89)

HT77XX+ (for SOT89)

77XX# (for SOT23)

77XX+ (for SOT23)

77XX# (for SOT23-5)

77XX+ (for SOT23-5)

2.7V

TO92

SOT89

SOT23

SOT23-5

3.0V

3.3V

3.7V

5.0V

Note:

²XX² stands for output voltages.

Both lead free and green compound 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.

²+² stands for green compound devices, which are Lead-free and Halogen-free.

For the TO-92 package, there will be a ²+² mark at the end of the date code.

Rev 1.90

October 13, 2010

12 3 4 5 6 7...19

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