Datasheet > LM2781TPX

LM2781TPX

更新时间： 2024-09-24 22:51:43

品牌	Logo	应用领域
美国国家半导体 - NSC		开关
页数	文件大小	规格书
7页	162K
描述
Ultra-Low Ripple Switched Capacitor Voltage Inverter

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LM2781TPX 数据手册

March 2003

LM2781

Ultra-Low Ripple Switched Capacitor Voltage Inverter

General Description

Features

n Inverts Input Voltage

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.

n Ultra-Low Voltage Ripple and 8Ω Typical Output

Resistance with Two Flying Capacitors

n Output Resistance of 18Ω Using One Flying Capacitor

n 210kHz (typ.) Switching Frequency

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.

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

See also: LM2780, a slow clock (12kHz typ) version of this

topology with extremely low supply current.

Typical Application Circuit

20044701

DS200447

www.national.com

12 3 4 5 6 7

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