Simplified Block Diagram
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- High Efficiency—85% (typ)
- 70µA Typical Operating Current
- 1µA Maximum Quiescent Current
- 2.0V to 16.5V Operation
- 525mA (Peak) Onboard Drive Capability
- ±1.5% Output Voltage Accuracy (MAX630)
- Low-Battery Detector
- Compact 8-Pin Mini-DIP and SO Packages
- Pin Compatible with RC4191/2/3
- +3V to +5V DC-DC Converters
- +5V to +15V DC-DC Converters
- 5mW to 5W Switch-Mode Power Supplies
- 9V Battery Life Extension
- High-Efficiency Battery-Powered DC-DC Converters
- Uninterruptible 5V Power Supplies
Operating current is only 70µA and is nearly independent of output switch current or duty cycle. A logic-level input shuts down the regulator to less than 1µA quiescent current. Low-current operation ensures high efficiency even in low-power battery-operated systems. The MAX630 and MAX4193 are compatible with most battery voltages, operating from 2.0V to 16.5V.
The devices are pin compatible with the Raytheon bipolar circuits, RC4191/2/3, while providing significantly improved efficiency and low-voltage operation. Maxim also manufactures the MAX631, MAX632, and MAX633 DC-DC converters, which reduce the external component count in fixed-output 5V, 12V, and 15V circuits. See Table 2 at the end of this data sheet for a summary of other Maxim DC-DC converters.