General Description

The MAX662A is a regulated +12V, 30mA-output, charge pump DC-DC converter. It provides the necessary +12V ±5% output to program byte-wide flash memories, and requires no inductors to deliver a guaranteed 30mA output from inputs as low as 4.75V. It fits into less than 0.1in2 of board space. The MAX662A is a pin-compatible upgrade to the MAX662, and is recommended for new designs. The MAX662A offers lower quiescent and shut down currents, and guarantees the output current over all temperature ranges.

The MAX662A is the first charge-pump boost converter to provide a regulated +12V output. It requires only a few inexpensive capacitors, and the entire circuit is completely surface-mountable.

A logic-controlled shutdown pin that interfaces directly with microprocessors reduces the supply current to only 0.5µA. The MAX662A comes in 8-pin narrow SO and DIP packages.

For higher-current flash memory programming solutions, refer to the data sheets for the MAX734 (120mA output current, guaranteed) and MAX732 (200mA output current, guaranteed) PWM, switch-mode DC-DC converters. Or, refer to the MAX761 data sheet for a 150mA, PFM switch-mode DC-DC converter that operates from inputs as low as 2V.

Features

♦ Regulated +12V ±5% Output Voltage

♦ 4.5V to 5.5V Supply Voltage Range

♦ Fits in 0.1in2

♦ Guaranteed 30mA Output

♦ No Inductor—Uses Only 4 Capacitors

♦ 185µA Quiescent Current

♦ Logic-Controlled 0.5µA Shutdown

♦ 8-Pin Narrow SO and DIP Packages

Applications

   +12V Flash Memory Programming Supplies

   Compact +12V Op-Amp Supplies

   Switching MOSFETs in Low-Voltage Systems

   Dual-Output +12V and +20V Supplies