HM5121A step-up DC/DC converter
■The HM5121A is a step-up DC/DC converter specifically designed to drive up to 5 series white LEDs with constant current. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminates the need for ballast resistors. The HM5121A switches at 1.4MHz, allowing the use of tiny external components. A low 0.25V feedback voltage minimizes power loss in the current setting resistor for high efficiency. The OVP pin monitors the output voltage and turns off the converter whenever the LEDs are open.
■The HM5121A is available in low profile SOT-23-6 package.
●Features
■Inherently Matched LED Current
■High Efficiency:82%
■Drives Up to Five LEDs from 2.2V Supply
■17V Over Voltage Protection
■Fast 1.4MHz Switching Frequency
■Requires Only 1μF Output Capacitors
■SOT-23-6 Package
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[ Communication equipment ][ White LED Backlight Display for PDA ][ Pocket PC ][ Handheld Devices ][ Cellular Phones ][ White LED display backlighting ] |
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Datasheet |
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Please see the document for details |
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SOT-23-6;SOT23-6;SOT23-6L |
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English Chinese Chinese and English Japanese |
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Mar 3,2010 |
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Ver1.0 |
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496 KB |
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