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MAX1920 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1920 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 9 page General Description The MAX1920/MAX1921 step-down converters deliver over 400mA to outputs as low as 1.25V. These convert- ers use a unique proprietary current-limited control scheme that achieves over 90% efficiency. These devices maintain extremely low quiescent supply current (50µA), and their high 1.2MHz (max) operating frequency permits small, low-cost external components. This combi- nation makes the MAX1920/MAX1921 excellent high- efficiency alternatives to linear regulators in space- constrained applications. Internal synchronous rectification greatly improves effi- ciency and eliminates the external Schottky diode required in conventional step-down converters. Both devices also include internal digital soft-start to limit input current upon startup and reduce input capacitor requirements. The MAX1920 provides an adjustable output voltage (1.25V to 4V). The MAX1921 provides factory-preset output voltages (see the Selector Guide). Both are available in space-saving 6-pin SOT23 packages. Applications Next-Generation Wireless Handsets PDAs, Palmtops, and Handy-Terminals Battery-Powered Equipment CDMA Power Amplifier Supply Features o 400mA Guaranteed Output Current o Internal Synchronous Rectifier for >90% Efficiency o Tiny 6-Pin SOT23 Package o Up to 1.2MHz Switching Frequency for Small External Components o 50µA Quiescent Supply Current o 0.1µA Logic-Controlled Shutdown o 2V to 5.5V Input Range o Fixed 1.5V, 1.8V, 2.5V, 3V, and 3.3V Output Voltages (MAX1921) o Adjustable Output Voltage (MAX1920) o ±1.5% Initial Accuracy o Soft-Start Limits Startup Current Note: The MAX1921 offers five preset output voltage options. See the Selector Guide, and then insert the proper designator into the blanks above to complete the part number. Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23 ________________________________________________________________ Maxim Integrated Products 1 19-2296; Rev 1; 7/02 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. MAX1921 IN AGND SHDN LX PGND OUT OFF ON 4.75k Ω 4.7 µF 4.7 µH 5600pF OUTPUT 1.5V UP TO 400mA INPUT 2V TO 5.5V CIN Typical Operating Circuit PART TEMP RANGE PIN-PACKAGE MAX1920EUT-T -40°C to +85°C 6 SOT23-6 MAX1921EUT_ _-T -40°C to +85°C 6 SOT23-6 Ordering Information AGND OUT (FB) SHDN 16 LX 5 PGND IN MAX1920 MAX1921 SOT23-6 TOP VIEW 2 34 ( ) ARE FOR MAX1920 ONLY Pin Configuration |
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Similar Description - MAX1920 |
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