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參數(shù)資料
| 型號(hào)： | SC1109CSTR |
| 廠商： | Semtech Corporation |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無(wú)電容，NMOS管，150mA的低壓差穩(wěn)壓器的反向電流保護(hù) |
| 文件頁(yè)數(shù)： | 12/17頁(yè) |
| 文件大?。?/td> | 223K |
| 代理商： | SC1109CSTR |
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SYNCHRONOUS PWM CONTROLLER WITH
DUAL LOW DROPOUT REGULATOR
CONTROLLERS
2000 SEMTECH CORP.
PRELIMINARY - October 16, 2000
SC1109
12
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DUAL LDO CONTROLLERS
SC1109 also provides two low drop out linear regula-
tor controllers that can be used to generate a 1.8V
(LDO2) and 2.5V (LDO1) outputs. The LDO output
voltage is achieved by controlling the voltage drop
across an external Mosfet from a 3.3V supply voltage.
The output voltage is sensed at the LDOS pin of the
SC1109 and compared to an internal reference. The
gate drive to the external Mosfet is then adjusted until
regulation is achieved. In order to have sufficient
voltage to the gate drives of the external Mosfet, an
internal charge pump is utilized to boost the gate
drive voltage to about two times the VSTBY.
The internal charge pump charges an external Bucket
capacitor to VSTBY and then connects it in series
with VSTBY to the LDOs supply at a frequency of
about 200kHz. This ensures sufficient gate drive
voltage for the LDOs independent of the VCC or the
12V external supply being available due to start up
timing sequence from the silver box.
The LDO1, and LDO2 output voltages are forced to
track the 3.3V input supply. This feature ensures that
during the start up application of the 3.3V, the 1.8V,
and 2.5V outputs track the 3.3V within 200mV typical
until regulation is achieved. However, the VSTBY
should be established at least 500us, to allow the
charge pump to reach its maximum voltage, before
the linear section will track within 200mV. This track-
ing will sequence the correct start up timing for the
external Chipset and Clock circuitry.
3.3V Vin
2.5V Vout
1.8V Vout
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC1109 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| SC1112 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| SC1112ASTR | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| SC1112ATSTR | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| SC1112EVB | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC1109EVB | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:SYNCHRONOUS PWM CONTROLLER WITH DUAL LOW DROPOUT REGULATOR CONTROLLERS |
| SC110CP | 功能描述:音頻指示器及警報(bào)器 CHIME, 30-120VAC/DC 2900HZ, CUL APPRVD RoHS:否 制造商:PUI Audio 產(chǎn)品:Indicators 聲壓級(jí):85 dB 音調(diào):Continuous 頻率:2300 Hz +/- 300 Hz 電壓額定值:5 VDC 電流額定值:30 mA 端接類(lèi)型: 直徑:12 mm 安裝:Through Hole |
| SC110D | 功能描述:音頻指示器及警報(bào)器 CONSTANT, 30-120V 1900HZ, CUL APPRVD RoHS:否 制造商:PUI Audio 產(chǎn)品:Indicators 聲壓級(jí):85 dB 音調(diào):Continuous 頻率:2300 Hz +/- 300 Hz 電壓額定值:5 VDC 電流額定值:30 mA 端接類(lèi)型: 直徑:12 mm 安裝:Through Hole |
| SC110DJ | 功能描述:音頻指示器及警報(bào)器 SLOW PULSE, 30-120V 1900HZ, CUL APPRVD RoHS:否 制造商:PUI Audio 產(chǎn)品:Indicators 聲壓級(jí):85 dB 音調(diào):Continuous 頻率:2300 Hz +/- 300 Hz 電壓額定值:5 VDC 電流額定值:30 mA 端接類(lèi)型: 直徑:12 mm 安裝:Through Hole |
| SC110DJR | 功能描述:音頻指示器及警報(bào)器 SLOW PULSE, 30-120V 1900HZ, CUL APPRVD RoHS:否 制造商:PUI Audio 產(chǎn)品:Indicators 聲壓級(jí):85 dB 音調(diào):Continuous 頻率:2300 Hz +/- 300 Hz 電壓額定值:5 VDC 電流額定值:30 mA 端接類(lèi)型: 直徑:12 mm 安裝:Through Hole |
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