Conv DC-DC Single Inv 4V to 16.5V 8-Pin SOIC N T/R

Maxim"s MAX4391 CMOS DC-DC regulators is designed for simple, efficient, inverting DC-DC converter circuits. The MAX4391 switching regulators provide all control and power handling functions in a compact 8 pin package: a 1.25V bandgap reference, an oscillator, a comparator for output voltage regulation, and a 525mA P-channel output MOSFET. A second comparator is also provided for convenient low battery detection. The operating current is typically 100µA and is nearly independent of output switch current and duty cycle, thus ensuring high efficiency even in low power battery operated systems. Operating in the inverting configuration, the MAX4391 can convert a positive input voltage in the range of +3V to 16.5V to any negative output voltage up to -20V. These devices are pin compatible enhancements of the Raytheon bipolar circuit, RC4391. Improvements include significantly higher efficiency. extended low voltage operation and improved output voltage accuracy. Maxim manufactures a broad line of DC-DC converters, including the MAX635, MAX636, and MAX637 which reduce the external component count in fixed -5 , -12V and 15V output DC-DC converter circuits.

• Converts Positive Voltage to Negative Voltage
• Low Operating Current-100µA
• Compact 8 Pin MiniDIP and SO Packages
• High Efficiency-85% Typical
• Low Battery Detector
• 4% Output Voltage Accuracy
• +3V lo +16.5V Input Voltage Range
• Adjustable Output Voltage