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參數(shù)資料
| 型號： | ST779AC |
| 元件分類： | DC/DC變換器 |
| 英文描述： | LOW VOLTAGE 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIERS |
| 中文描述： | 低壓3-3.3V/5V/ADJUSTABLE輸出DC - DC轉(zhuǎn)換器與同步整流器 |
| 文件頁數(shù)： | 1/11頁 |
| 文件大?。?/td> | 344K |
| 代理商： | ST779AC |
1/11
October 2002
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1V TO 6V INPUT GUARANTEES START-UP
UNDER LOAD
MAXIMUM OUTPUT CURRENT OF 300mA
(778 OR 779 ADJUSTED TO 3V)
LOAD FULLY DISCONNECTED IN
SHUTDOWN
TYPICAL EFFICIENCY OF 82%
INTERNAL 1A POWER SWITCH AND
SYNCHRONOUS RECTIFIER
ADJUSTABLE CURRENT LIMIT ALLOWS
LOW-COST INDUCTORS
SUPPLY CURRENT OF 270μA (NO LOAD)
SHUTDOWN SUPPLY CURRENT 20μA
PACKAGE AVAILABLE: DIP-8 AND SO-8
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DESCRIPTION
The ST777/778/779 are dc-dc converters that
step-up from low voltage inputs requiring only
three external components, an inductor (typically
22μH) and two capacitors. The device include a
Sinchronous Rectifier that eliminates the need for
an external catch diode, and allows regulation
even when the input is greater than the output.
Unlike others step-up DC-DC converters the
ST777/778/779’s Sinchronous Rectifierturns off in
the shutdown mode, fully disconnecting the output
from the source. This eliminates the current drain
associated with conventional step-up converters
when off or in shutdown. Supply current is 270μA
under no load and only 20μA in stand by mode.
ST777/778/779
LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT
DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER
V
IN
V
O
22μH
100μF
100μF
R
LIM
I
LIM
L
X
IN
OUT
PGND
SEL
AGND
1
2
3
4
5
6
7
8
SHDN
1.25V
VREF
SHUTDOWN
CONTROL
DELAY
TIMER
OFF
DELAY
TIMER
ON
SWITCH
DRIVER
ACTIVE RECTIFIER
RECTIFIER
CONTROL
1 : N
SCHEMATIC DIAGRAM
SO-8
DIP-8
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST777ACD | LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
| ST777ACN | LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
| ST778 | LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
| ST778ACD | LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
| ST778ACN | LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST779ACD | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Low Volt Adj Stepup RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| ST779ACD-TR | 功能描述:IC REG BOOST SYNC ADJ 0.3A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| ST779ACN | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
| ST7805 | 制造商:SEMTECH_ELEC 制造商全稱:SEMTECH ELECTRONICS LTD. 功能描述:3-terminal 1 A positive voltage regulator |
| ST7805R | 制造商:SEMTECH_ELEC 制造商全稱:SEMTECH ELECTRONICS LTD. 功能描述:3-terminal 1 A positive voltage regulator |
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