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MAX870：Switched-Capacitor Voltage Inverters

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

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.

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

MAX870, MAX871: Typical Operating Circuit Applications/Uses Battery-Operated Equipment Cell Phones Handy-Terminals, PDAs Local -5V Supply from 5V Logic Supply Medical Instruments Small LCD Panels

DataSheet

Parametrics

Quality and Environmental Data

• MAX870.pdf

Related Products

• MAX860：50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters

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