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參數(shù)資料
| 型號(hào)： | HT77XX |
| 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(yè)數(shù)： | 1/19頁(yè) |
| 文件大小： | 502K |
| 代理商： | HT77XX |
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HT77XX
PFM Step-up DC/DC Converter
Selection Table
Part No.
Output Voltage
Package
Marking
HT7718
1.8V
TO-92
SOT-89
SOT-23
SOT-25
HT77XX (for TO-92)
HT77XX# (for SOT-89)
77XX# (for SOT-23)
77XX# (for SOT-25)
HT7727
2.7V
HT7730
3.0V
HT7733
3.3V
HT7737
3.7V
HT7750
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 1.60
1
September 12, 2007
Features
Low start-up voltage: 0.7V (Typ.), 0.9V (Max.)
High efficiency: 85% (Typ.), V
OUT
2.7V
High output voltage accuracy: 2.5%
Output voltage: 1.8V, 2.7V, 3.0V, 3.3V, 3.7V, 5.0V
Ultra low supply current I
DD2
: 4 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 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, 2.7V,
3.0V, 3.3V, 3.7V or 5.0V. CMOS technology ensures ul-
tra 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, 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 |
|---|---|
| HT77XX_07 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:PFM Step-up DC/DC Converter |
| HT77XXA | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:PFM Step-up DC/DC Converter |
| 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 |
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