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MAX1947ETA33 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1947ETA33 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 10 page General Description The MAX1947 is a compact, high-efficiency, step-up DC- DC converter that regulates output voltages from 1.8V to 3.3V to power µP/DSP cores, memory, and I/O rails in 1- and 2-cell alkaline/NiMH/NiCd battery-powered systems. It features an internal 800mA switch and synchronous rectifier to achieve up to 94% efficiency and to eliminate the need for an external Schottky diode. High-frequency switching (up to 2MHz) results in low ripple and small external components, while automatic pulse skipping at light loads reduces supply current to just 70µA for extended battery life. Maxim’s proprietary True Shutdown™ reduces supply current to just 2µA and fully discharges the output to ground. The convert- er is offered in fixed-output voltages of 1.8V, 2.5V, 3.0V, and 3.3V, requiring no feedback or compensation net- work. A 75ms RESET output flag provides for power-on reset (POR) and undervoltage detection. The MAX1947 is available in a space-saving 8-pin TDFN package. Applications MP3 Players, Pagers, and CD Players PDAs and Organizers Digital Still Cameras Cordless Phones Wireless Mice/Keyboards Portable Medical Equipment Other Battery-Powered Systems Features ♦ Low Input (0.7V) and Output (1.8V) Voltage Capability ♦ Internal Synchronous Rectifier ♦ High 94% Efficiency ♦ Fixed Output Voltages: 1.8V, 2.5V, 3V, and 3.3V ♦ Up to 2MHz Switching Allows Small External Components and Low Output Ripple ♦ Automatic Pulse Skipping at Light Loads for Extended Battery Life ♦ Low 70µA (typ) Operating Supply Current (Measured at OUT) ♦ Low 2µA Logic-Controlled Shutdown ♦ True Shutdown Fully Discharges Output to Ground ♦ Uses Only Small Ceramic Capacitors ♦ 75ms RESET Output Flag Low Input/Output Voltage Step-Up DC-DC Converter with RESET ________________________________________________________________ Maxim Integrated Products 1 LX PGND SHDN 8 7 BATT OUT GND GND RESET TDFN 3mm x 3mm TOP VIEW 1 2 3 4 6 5 MAX1947 Pin Configuration Ordering Information MAX1947 LX GND BATT OUT PGND 10µF 2.2µF 4.7µH VOUT +1.8V, +2.5V, +3.0V, +3.3V VIN +0.7V TO +VOUT RESET SHDN Typical Application Circuit 19-3086; Rev 0; 5/04 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. *xy represents the output voltage code (e.g., 18 =1.8V). Standard output voltages include 3.3V (33), 3.0V (30), 2.5V (25), and 1.8V (18). Contact the factory for other output voltages in 100mV increments between 1.8V and 3.3V; the minimum order quantity is 25,000 units. EVALUATION KIT AVAILABLE PART TEMP RANGE PIN-PACKAGE MAX1947ETAxy* -40 °C to +85°C8 TDFN 3mm x 3mm True Shutdown is a trademark of Maxim Integrated Products, Inc. |
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