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MAX1986ETE Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1986ETE Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 17 page General Description The MAX1984/MAX1985/MAX1986 are white light-emit- ting diode (LED) drivers that use individual regulators to control the current of up to eight LEDs. A high-efficiency step-up regulator generates just enough voltage to keep all the current regulators in regulation. A versatile dim- ming interface accommodates analog, digitally adjusted pulse-width modulation (DPWM), or parallel control. The individual current regulators allow good current matching between LEDs. Open or shorted LEDs cannot affect the performance of other LEDs. The step-up regulator achieves high efficiency by using synchronous rectification. The internal N-channel switch and P-channel synchronous rectifier eliminate the need for external MOSFETs and diodes. The 1MHz switching frequency allows the use of low-profile inductors and ceramic capacitors. The brightness can be easily adjusted using a multi- mode dimming interface, which allows brightness control through a DPWM signal, a 2- or 3-bit parallel control interface, or an analog signal. The DPWM signal can be connected directly to the control pin without the need for an external RC filter if its frequency is 10kHz or above. The MAX1984 drives up to eight LEDs, the MAX1985 drives up to six LEDs, and the MAX1986 drives up to four LEDs. Each device has an LED select pin (SEL) that allows one subset, the other subset, or all LEDs to be illuminated. All three devices are available in a 4mm ✕ 4mm thin QFN package. Applications PDAs and Hand-Held PCs Cellular Phones Digital Cameras Features o Synchronous Step-Up Regulator Achieves >95% Efficiency Internal Switch and Synchronous Rectifier Eliminates External MOSFETs and Diodes 1MHz Fixed Frequency Minimizes Component Sizes o Up to 90% Total LED Efficiency o Accurate LED Current Matching (8% max) o Adjustable Maximum LED Current o Multimode Dimming Control Digital Pulse-Width Modulation Control 2-Bit Parallel Control 3-Bit Parallel Control Analog Control o Selectively Enable LEDs o Open-LED Detection o Unique 0.5mA LED Test Mode o 2.7V to 5.5V Input Supply Range o Small 4mm x 4mm 20-Pin Thin QFN Package Ultra-High-Efficiency White LED Drivers ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-2761; Rev 0; 1/03 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. EVALUATION KIT AVAILABLE PART TEMP RANGE PIN-PACKAGE NO. OF LEDs MAX1984ETP -40°C to +85°C 20 Thin QFN 8 MAX1985ETP -40°C to +85°C 20 Thin QFN 6 MAX1986ETE -40°C to +85°C 16 Thin QFN 4 20 19 18 17 16 6 7 8 9 10 15 14 13 12 11 BITB REF SETI LD8 1 2 3 4 5 LD7 OUT LX GND LD1 LD2 TOP VIEW 4mm x 4mm THIN QFN MAX1984 20 19 18 17 16 6 7 8 9 10 15 14 13 12 11 BITB REF SETI N.C. 1 2 3 4 5 LD6 OUT LX GND N.C. LD1 4mm x 4mm THIN QFN MAX1985 16 15 14 13 5 6 7 8 12 11 10 9 BITA BITB REF SETI 1 2 3 4 OUT LX GND LD1 4mm x 4mm THIN QFN MAX1986 Pin Configurations |
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