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EV0021 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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EV0021 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 2 page  MP1521 High Efficiency White LED Driver MP1521 Rev 2.7 10/06/04 www.monolithicpower.com 1 Monolithic Power Systems General Description The MP1521 is a constant-current Boost Regulator. This IC has three individual current-sensing feedbacks, which are ideal for driving multiple strings of series connected LEDs. The OLS pin is designed for detecting loose or open LED connections. The IC uses a peak current, constant minimum off-time architecture. The feedback pins measure voltage across sense resistors in series with the LED strings. When supplying a bias current of 20mA, the voltage drop across the sense resistor is only 0.4V to minimize power loss. Either a DC voltage or a PWM signal at the BRT/PWM input can control the LED brightness. The MP1521 has an on board power MOSFET switch that is protected by current limit, open load shutdown, thermal shutdown, and under voltage lockout. Ordering Information Part Number ∗ Package Temperature MP1521EK MSOP10 -20 ° to +85°C MP1521EQ QFN16 (3x3) -20 ° to +85°C EV0005 MP1521EK Evaluation Board EV0021 MP1521EQ Evaluation Board ∗ For Tape & Reel, add suffix –Z (i.e., MP1521EK–Z) For Lead Free, add suffix –LF (i.e., MP1521EK–LF–Z) Features On Board Power MOSFET Drive 9 White LEDs from 2.7V Input Drive 15 White LEDs from 5V Input Up to 90% Efficiency Over 80mA Output Current Capacity Open Load Shutdown Low Current Sensing Feedback Voltage Up to 3 String Current Sensing Feedback Analog and Digital PWM Brightness Control UVLO, Thermal Shutdown Soft Start Internal Current Limit Available in Compact MSOP10 and Tiny 3 mm x 3 mm QFN16 Package Evaluation Boards Available Applications Handheld Computers, Cell phones, PDAs, Digital and Video Cameras, Small LCD Displays Li Ion and NiMH Battery Applications Typical Application Circuit (One String of Six (6) LEDs) 8 7 IN BRT/PWM FB1 OLS SW 10 GND 9 CIN COUT EN REF 4 3 2 1 D1 MP1521 L1 6 5 FB2 FB3 White LEDs BRT/ PWM EN GND OFF ON VIN Efficiency vs LED current, 1 string of 6 Using Toko D62CB 47 µHInductor 50 60 70 80 90 100 5 10 15 20 25 LED Current (mA) VIN = 5V VIN = 4V VIN = 3V |
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