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MAX1720：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

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.

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)

MAX1719, MAX1720, MAX1721: Typical Operating Circuit Applications/Uses Battery-Powered Applications GaAs PA Bias Supply Handy-Terminals, PDAs Local Negative Supply from a Positive Supply Small LCD Panels

DataSheet

Parametrics

Related Products

• MAX860：50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
• MAX868：Regulated, Adjustable -2x Inverting Charge Pump
• MAX870：Switched-Capacitor Voltage Inverters
• MAX828：Switched-Capacitor Voltage Inverters

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