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Dual-Output Charge Pump with Shutdown

Generates Bipolar Outputs

Product Details

Key Features

Parametric specs for Charge Pumps
Topology Doubler
Dual Output
Inverter
Unregulated
VIN (V) (min) 1.75
VIN (V) (max) 6
IOUT (A) (typ) 0.035
Unadj. VOUT (V) ±2xVIN
IQ (mA) (max) 1
Switching Frequency (kHz) 185
Oper. Temp. (°C) -40 to +85
Package/Pins QSOP/16
Budgetary
Price (See Notes)
1.93
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Simplified Block Diagram

Technical Docs

Data Sheet Dual-Output Charge Pump with Shutdown Mar 01, 1996

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Parameters

Parametric specs for Charge Pumps
Topology Doubler
Dual Output
Inverter
Unregulated
VIN (V) (min) 1.75
VIN (V) (max) 6
IOUT (A) (typ) 0.035
Unadj. VOUT (V) ±2xVIN
IQ (mA) (max) 1
Switching Frequency (kHz) 185
Oper. Temp. (°C) -40 to +85
Package/Pins QSOP/16
Budgetary
Price (See Notes)
1.93

Key Features

  • Requires Only Four Capacitors
  • Dual Outputs (Positive and Negative)
  • Low Input Voltages: +1.75V to +6.0V
  • 1µA Logic-Controlled Shutdown
  • Selectable Frequencies Allow Optimization of Capacitor Size and Supply Current

Applications/Uses

  • Data Acquisition
  • LCD Panels
  • Low-Cost Split Supply for Low-Voltage
  • Low-Voltage GaAsFET Bias in Wireless Handsets
  • Split Supply for Analog Circuitry
  • Split Supply from 2 to 4 Ni Cells or 1 Li+ Cell
  • VCO and GaAsFET Supplies

Description

The MAX864 CMOS, charge-pump, DC-DC voltage converter produces a positive and a negative output from a single positive input, and requires only four capacitors. The charge pump first doubles the input voltage, then inverts the doubled voltage. The input voltage ranges from +1.75V to +6.0V.

The internal oscillator can be pin-programmed from 7kHz to 185kHz, allowing the quiescent current, capacitor size, and switching frequency to be optimized. The 55Ω output impedance permits useful output currents up to 20mA. The MAX864 also has a 1µA logic-controlled shutdown.

The MAX864 comes in a 16-pin QSOP package that uses the same board area as a standard 8-pin SOIC. For more space-sensitive applications, the MAX865 is available in an 8-pin µMAX® package, which uses half the board area of the MAX864.

Simplified Block Diagram

MAX864: Typical Operating Circuit MAX864: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet Dual-Output Charge Pump with Shutdown Mar 01, 1996

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 .