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SOT23, Switched-Capacitor Voltage Inverters with Shutdown

Smallest, High-Efficiency Bias for Small LCD/GaAsFET PA Bias: Small Cap Size, No Inductors and Low Supply Current

Product Details

Key Features

Parametric specs for Charge Pumps
Topology Inverter
Unregulated
VIN (V) (min) 1.5
VIN (V) (max) 5.5
IOUT (A) (typ) 0.025
Unadj. VOUT (V) -VIN
IQ (mA) (max) 0.65
Switching Frequency (kHz) 125
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/6
Budgetary
Price (See Notes)
0.8
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Simplified Block Diagram

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Parameters

Parametric specs for Charge Pumps
Topology Inverter
Unregulated
VIN (V) (min) 1.5
VIN (V) (max) 5.5
IOUT (A) (typ) 0.025
Unadj. VOUT (V) -VIN
IQ (mA) (max) 0.65
Switching Frequency (kHz) 125
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/6
Budgetary
Price (See Notes)
0.8

Key Features

  • 1nA Logic-Controlled Shutdown
  • 6-Pin SOT23 Package
  • 99.9% Voltage Conversion Efficiency
  • 50µA Quiescent Current (MAX1720)
  • +1.5V to +5.5V Input Voltage Range
  • 25mA Output Current
  • Requires Only Two 1µF Capacitors (MAX1719/MAX1721)

Applications/Uses

  • Battery-Powered Applications
  • GaAs PA Bias Supply
  • Handy-Terminals, PDAs
  • Local Negative Supply from a Positive Supply
  • Small LCD Panels

Description

The ultra-small MAX1719/MAX1720/MAX1721 monolithic, CMOS charge-pump inverters accept input voltages ranging from +1.5V to +5.5V. The MAX1720 operates at 12kHz, and the MAX1719/MAX1721 operate at 125kHz. High efficiency, small external components, and logic-controlled shutdown make these devices ideal for both battery-powered and board-level voltage conversion applications.

Oscillator control circuitry and four power MOSFET switches are included on-chip. A typical MAX1719/MAX1720/MAX1721 application is generating a -5V supply from a +5V logic supply to power analog circuitry. All three parts come in a 6-pin SOT23 package and can deliver a continuous 25mA output current.

For pin-compatible SOT23 switched-capacitor voltage inverters without shutdown (5-pin SOT23), see the MAX828/MAX829 and MAX870/MAX871 data sheets. For applications requiring more power, the MAX860/MAX861 deliver up to 50mA. For regulated outputs (up to -2 x VIN), refer to the MAX868. The MAX860/MAX861 and MAX868 are available in space-saving µMAX® packages.

Simplified Block Diagram

MAX1719, MAX1720, MAX1721: Typical Operating Circuit MAX1719, MAX1720, MAX1721: Typical Operating Circuit Zoom icon

Technical Docs

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 .