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

Up to 1MHz Switching Frequency Allows Small Capacitors

Product Details

Key Features

Parametric specs for Charge Pumps
Topology Doubler
Inverter
Unregulated
VIN (V) (min) 3
VIN (V) (max) 5.5
IOUT (A) (typ) 0.125
Unadj. VOUT (V) +2xVIN
-VIN
IQ (mA) (max) 17
Switching Frequency (kHz) 1000
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
2.76
View Less

Simplified Block Diagram

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Sampling:
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Parameters

Parametric specs for Charge Pumps
Topology Doubler
Inverter
Unregulated
VIN (V) (min) 3
VIN (V) (max) 5.5
IOUT (A) (typ) 0.125
Unadj. VOUT (V) +2xVIN
-VIN
IQ (mA) (max) 17
Switching Frequency (kHz) 1000
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
2.76

Key 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/Uses

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

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.

Simplified Block Diagram

MAX1680, MAX1681: Typical Operating Circuit MAX1680, MAX1681: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.