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
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
titleDownload file
MAX1719-MAX1721 Data SheetMAX1719-MAX1721.pdf
Parametrics
Part NumberTopologyVIN
(V)
VIN
(V)
ICC
(mA)
Unadj. VOUT
(V)
IOUT
(A)
Oper. Freq.
(kHz)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxmaxtypSee Notes
MAX1719Inverter
Unregulated
1.55.50.65-VIN0.025125-40 to +85SOT/6$0.71 @1k
MAX17200.0912SOT/6
MAX17210.65125SOT/6
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
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1720EUTActiveSOT,;6 pin;9 mm²-40°C to +85°CNo
MAX1720EUT+ActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX1720EUT+TActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX1720EUT-TNo Longer AvailableMAX1720EUT+TSOT,;6 pin;9 mm²-40°C to +85°CNo
MAX1719-MAX1721.pdf MAX1721
DC-DC Conversion Without Inductors MAX871
MAX1719-MAX1721.pdf MAX1721