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MAX1680

Maxim
Part Number MAX1680
Manufacturer Maxim
Description Switched-Capacitor Voltage Converters
Published May 5, 2014
Detailed Description 19-1247; Rev 0; 7/97 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters _______________General Descript...
Datasheet PDF File MAX1680 PDF File

MAX1680
MAX1680

Overview
19-1247; Rev 0; 7/97 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters _______________General 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 o Selectable Switching Frequencies: 125kHz/250kHz (MAX1680) 500kHz/1MHz (MAX1681) o Allow Use of Small Capacitors (1µF for the MAX1681) o 125mA Output Current o 3.
5Ω Output Impedance o 1µA Logic-Controlled Shutdown o Configurable as Voltage Inverters or Doublers o +2.
0V to +5.
5V Input Voltage Range o Available in 8-Pin SO Packages o 90% Efficiency MAX1680/MAX1681 ________________________Applications Local Negative Supplies Interface Power Supplies Op-Amp Power Supplies MOSFET Bias ______________Ordering Information PART MAX1680C/D MAX1680ESA MAX1681C/D MAX1681ESA TEMP.
RANGE 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C PIN-PACKAGE Dice* 8 SO Dice* 8 SO *Contact factory for dice specifications.
Pin Configuration appears at end of data sheet.
__________________________________________________Typical Operating Circuits +VINPUT +3V TO +5.
5V 1µF CAP+ SHDN C1 1µF +VINPUT +4V TO +5.
5V 1µF CAP+ SHDN DOUBLED OUTPUT VOLTAGE FSEL IN FSEL IN C2 1µF C1 1µF MAX1681 LV GND INVERT...


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