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Switched-Capacitor Voltage Doublers

SOT23 Voltage Doubler Needs Only two External Caps; Ultra-Small LCD Supply for PDAs and Cell Phones

Product Details

Key Features

Parametric specs for Charge Pumps
Topology Doubler
Unregulated
VIN (V) (min) 2
VIN (V) (max) 5.5
IOUT (A) (typ) 0.045
Unadj. VOUT (V) +2xVIN
ICC (mA) (max) 0.145
Switching Frequency (kHz) 12
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/5
Budgetary
Price (See Notes)
0.8
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Simplified Block Diagram

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Parameters

Parametric specs for Charge Pumps
Topology Doubler
Unregulated
VIN (V) (min) 2
VIN (V) (max) 5.5
IOUT (A) (typ) 0.045
Unadj. VOUT (V) +2xVIN
ICC (mA) (max) 0.145
Switching Frequency (kHz) 12
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/5
Budgetary
Price (See Notes)
0.8

Key Features

  • 5-Pin SOT23 Package
  • +2.0V to +5.5V Input Voltage Range
  • 98% Voltage-Conversion Efficiency
  • 110µA Quiescent Current (MAX1682)
  • Requires Only Two Capacitors
  • Up to 45mA Output Current

Applications/Uses

  • Cell Phones
  • Handy Terminals
  • PDAs
  • Small LCD Panels

Description

The ultra-small MAX1682/MAX1683 monolithic, CMOS charge-pump voltage doublers accept input voltages ranging from +2.0V to +5.5V. Their high voltage-conversion efficiency (over 98%) and low operating current (110µA for MAX1682) make these devices ideal for both battery-powered and board-level voltage-doubler applications.

Oscillator control circuitry and four power MOSFET switches are included on-chip. The MAX1682 operates at 12kHz, and the MAX1683 operates at 35kHz. A typical application includes generating a 6V supply to power an LCD display in a hand-held PDA. Both parts are available in a 5-pin SOT23 package and can deliver 30mA with a typical voltage drop of 600mV.

Simplified Block Diagram

MAX1682, MAX1683: Typical Operating Circuit MAX1682, MAX1683: 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 .