CMOS Fixed/Adjustable Output Step-Up Switching Regulators

The MAX631, MAX632, and MAX633 are +5V, + 12V, and +15V fixed output, step-up DC-DC converters for use in low-power, high-efficiency switching regulator applica­ tions. The only external components required are an output filter capacitor and a low-cost inductor. Included on-chip are low battery detection circuitry and a charge pump output for generating a negative voltage in dual­ supply applications.

Though most simply used as fixed output regulators, the Ordering Information MAX631/632/633 can also be set for other output volt­ ages by adding an external voltage divider.

Maxim manufactures a broad line of step-up, step-down, and inverting DC-DC converters, with features such as logic-level shutdown, adjustable oscillator frequency, and external MOSFET drive.

APPLICATIONS

* Minimum Component, High-Efficiency

* DC-DC Converters

* Portable Instruments

* Rechargeable and Primary Battery Power Conversion

* Uninterruptable On-Board Power Supplies

* Card Level Multiple Power Conversion

* Fixed +SV, +12V, +15V Output Voltages

* Adjustable Output with 2 Resistors

* 80% Typ Efficiency

* Only 2 External Components

* Charge Pump for Negative Output

* 135µA Typ Operating Current