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參數(shù)資料
| 型號： | LM2781TPX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 400 kHz SWITCHING FREQ-MAX, PBGA8 |
| 封裝： | CSP-8 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大小： | 162K |
| 代理商： | LM2781TPX/NOPB |
LM2781
Ultra-Low Ripple Switched Capacitor Voltage Inverter
General Description
The LM2781 is a charge pump that inverts an input voltage
in the range of 1.8V to 5.5V to the corresponding output
voltage of -1.8V to -5.5V. With use of three or four low-cost
external ceramic capacitors, the LM2781 can provide up to
50mA of output current.
The LM2781 operates at a 210kHz typical switching fre-
quency to minimize supply current (0.7mA typ.). Two charge
pumps operate 180 out of phase to significantly reduce the
output voltage ripple compared to that of traditional single-
phase charge pump circuits. If larger output ripple can be
tolerated, optional capacitor C2 may be omitted to reduce
the cost and size of the solution. The LM2781 is available in
an 8-pin Micro SMD chip-scale package.
See also: LM2780, a slow clock (12kHz typ) version of this
topology with extremely low supply current.
Features
n
Inverts Input Voltage
n
Ultra-Low Voltage Ripple and 8
Typical Output
Resistance with Two Flying Capacitors
n
Output Resistance of 18
Using One Flying Capacitor
n
210kHz (typ.) Switching Frequency
n
8-pin micro SMD Package (1.4mm x 1.4mm x 0.5mm)
Applications
n
Cellular Phones
n
Pagers
n
PDAs
n
Op-Amp Power Supplies
n
Interface Power Supplies
n
Handheld Instruments
Typical Application Circuit
20044701
March 2003
LM2781
Ultra-Low
Ripple
Switched
Capacitor
V
oltage
Inverter
2003 National Semiconductor Corporation
DS200447
www.national.com
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| LM2787 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Noise Regulated Switched Capacitor Voltage |
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| LM2787BP/NOPB | 功能描述:IC REG SWITCHD CAP INV ADJ 8USMD RoHS:是 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 標準包裝: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 |
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