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Switched-Capacitor Voltage Inverters

Compact, Inductorless, Low-Profile Inverter Fits 0.025 Sq. Inch , Biases GaAsFET PA

Product Details

Key Features

Parametric specs for Charge Pumps
Topology Inverter
Unregulated
VIN (V) (min) 1.4
VIN (V) (max) 5.5
IOUT (A) (typ) 0.025
Unadj. VOUT (V) -VIN
IQ (mA) (max) 1
Switching Frequency (kHz) 125
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/5
Budgetary
Price (See Notes)
2.41
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Simplified Block Diagram

Technical Docs

Data Sheet Switched-Capacitor Voltage Inverters May 31, 2004

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Parameters

Parametric specs for Charge Pumps
Topology Inverter
Unregulated
VIN (V) (min) 1.4
VIN (V) (max) 5.5
IOUT (A) (typ) 0.025
Unadj. VOUT (V) -VIN
IQ (mA) (max) 1
Switching Frequency (kHz) 125
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/5
Budgetary
Price (See Notes)
2.41

Key Features

  • 5-Pin SOT23-5 Package
  • 99% Voltage Conversion Efficiency
  • Invert Input Supply Voltage
  • 0.7mA Quiescent Current (MAX870)
  • +1.4V to +5.5V Input Voltage
  • Require Only Two Capacitors
  • 25mA Output Current
  • Shutdown Control

Applications/Uses

  • Battery-Operated Equipment
  • Cell Phones
  • Handy-Terminals, PDAs
  • Local -5V Supply from 5V Logic Supply
  • Medical Instruments
  • Small LCD Panels

Description

The ultra-small MAX870/MAX871 monolithic, CMOS charge-pump inverters accept input voltages ranging from +1.4V to +5.5V. The MAX870 operates at 125kHz, and the MAX871 operates at 500kHz. Their high efficiency (90%) and low operating current (0.7mA for the MAX870) 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 MAX870/ MAX871 application is generating a -5V supply from a +5V logic supply to power analog circuitry. Both parts come in a 5-pin SOT23-5 package and can deliver 25mA with a voltage drop of 500mV.

For a similar device with logic-controlled shutdown, refer to the MAX1720/MAX1721. For applications requiring more power, the MAX860 delivers up to 50mA with a voltage drop of 600mV, in a space-saving µMAX package.

Simplified Block Diagram

MAX870, MAX871: Typical Operating Circuit MAX870, MAX871: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet Switched-Capacitor Voltage Inverters May 31, 2004

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 .