Switched-Capacitor Voltage Inverters

 

Part Number	Replacement	Explanation

Description

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The ultra-small MAX828/MAX829 monolithic, CMOS charge-pump inverters accept input voltages ranging from +1.5V to +5.5V. The MAX828 operates at 12kHz, and the MAX829 operates at 35kHz. Their high efficiency (greater than 90% over most of the load-current range) and low operating current (60µA for the MAX828) make these devices ideal for both battery-powered and board-level voltage-conversion applications.

The MAX828/MAX829 combine low quiescent current and high efficiency. Oscillator control circuitry and four power MOSFET switches are included on-chip. Applications include 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 MAX1719/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.

MAX828, MAX829: Typical Operating Circuit Enlarge+

Key Features

• 5-Pin SOT23-5 Package
• 95% Voltage Conversion Efficiency
• Inverts Input Supply Voltage
• 60µA Quiescent Current (MAX828)
• +1.5V to +5.5V Input Voltage Range
• Requires Only Two Capacitors
• 25mA Output Current

Applications/Uses

• Battery-Powered Applications
• Cell Phones
• Handy-Terminals, PDAs
• Medical Instruments
• Small LCD Panels