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參數(shù)資料
| 型號： | HT77XXA |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | PFM Step-up DC/DC Converter |
| 中文描述： | PFM步升直流/直流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大小： | 365K |
| 代理商： | HT77XXA |
HT77XXA
PFM Step-up DC/DC Converter
Selection Table
Part No.
Output Voltage
Package
Marking
HT7727A
2.7V
TO-92
SOT-89
SOT-23
SOT-25
HT77XXA (for TO-92)
HT77XXA# (for SOT-89)
77XXA# (for SOT-23)
77XXA# (for SOT-25)
HT7730A
3.0V
HT7733A
3.3V
HT7750A
5.0V
Note:
XX stands for output voltages.
Only lead free devices are available. # stands for lead free devices. For the TO-92 package, there will be a
# mark at the end of the date code.
Block Diagram
Rev 1.10
1
September 26, 2007
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 I
DD
: 5 A (Typ.)
Low ripple and low noise
Low shutdown current: 0.5 A (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 com-
ponents to provide a fixed output voltage of 2.7V, 3.0V,
3.3V or 5.0V. CMOS technology ensures ultra low sup-
ply 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 rip-
ple 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.
! " #
$
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT77XXS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:盛群半導(dǎo)體推出HT77xxS同步整流直流升壓IC，拓展Power直流升壓 DC-DC PFM |
| HT77XXSA | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:General Description |
| HT7810(8DIP) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PCMCIA Switching Circuit |
| HT7810(8SOIC) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PCMCIA Switching Circuit |
| HT7816DNV | 制造商:Speco 功能描述:WEATHERPROOF SQUARE BULLET CAM 2.8-12MM VARIFOCAL LENS |
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