MAXIM MAX863EEE

The MAX863 dual-output DC-DC converter contains two independent step-up controllers in a single compact package. This monolithic Bi-CMOS design draws only 85μA when both controllers are on. The input range extends down to 1.5V, permitting use in organizers, translators, and other low-power hand-held products. The MAX863 provides 90% efficiency at output loads from 20mA to over 1A. This space-saving device is supplied in a 16-pin QSOP package that fits in the same area as an 8-pin SOIC. The MAX863 dual, bi-CMOS, step-up, switch-mode power-supply controller provides preset 3.3V, 5V, or adjustable outputs. Its pulse-frequency-modulated (PFM) control scheme combines the advantages of low supply current at light loads and high efficiency with heavy loads. These attributes make the MAX863 ideal for use in portable battery-powered systems where small size and low cost are extremely important, and where low quiescent current and high efficiency are needed to maximize operational battery life. Use of external current-sense resistors and MOSFETs allows the designer to tailor the output current and voltage capability for a diverse range of applications.

• 90% Efficiency
• 1.5V Start-Up Voltage
• 85μA Max Total Quiescent Supply Current
• 1μA Shutdown Mode
• Independent Shutdown Inputs
• Drives Surface-Mount, Dual N-Channel MOSFETs
• Low-Battery Input/Output Comparator
• Step-Up/Down Configurable

• 2- and 3-Cell Portable Equipment
• Organizers
• Translators
• Hand-Held Instruments
• Palmtop Computers
• Personal Digital Assistants (PDAs)
• Dual Supply (Logic and LCD)