MAX1681ESA 125mA, Frequency-Selectable Switched-Capacitor Voltage Converters

¡¾Part No.¡¿     MAX1681ESA
¡¾Category¡¿   Voltage Converters
¡¾Packing¡¿    SOP-8
¡¾MFQ¡¿           Maxim
¡¾Datasheet¡¿MAX1681ESA Datasheet

Description

The MAX1680/MAX1681 inductorless switched-capacitor voltage converters either invert an input voltage of +2.0V to +5.5V or double it while supplying up to 125mA output current. They have a selectable-frequency option that allows the use of small capacitors: 4.7µF (MAX1680), 1µF (MAX1681). With their high output current capability, these charge-pump devices are suitable replacements for inductor-based regulators, which require more expensive external components and additional board space.
The devices¡¯ equivalent output resistance (typically 3.5Ω) allows them to deliver as much as 125mA with only a 440mV drop. A shutdown feature reduces quiescent current to less than 1µA. The MAX1680/MAX1681 are available in 8-pin SO packages. For devices that deliver up to 50mA in smaller µMAX packages, refer to the MAX860/MAX861 data sheet.

Features

© Selectable Switching Frequencies:
125kHz/250kHz (MAX1680)
500kHz/1MHz (MAX1681)
© Allow Use of Small Capacitors
(1µF for the MAX1681)
© 125mA Output Current
© 3.5Ω Output Impedance
© 1µA Logic-Controlled Shutdown
© Configurable as Voltage Inverters or Doublers
© +2.0V to +5.5V Input Voltage Range
© Available in 8-Pin SO Packages
© 90% Efficiency

Applications

Local Negative Supplies
Interface Power Supplies
Op-Amp Power Supplies
MOSFET Bias

Contact person:

Frances New

Phone:+86-755-81832961

Fax:+86-755-83299282

Email:sumzi@sumzi.com

MSN:sumzi-frances@msn.com

http://www.sumzi.com