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MAX1984

Maxim
Part Number MAX1984
Manufacturer Maxim
Description Ultra-High-Efficiency White LED Drivers
Published May 6, 2005
Detailed Description 19-2761; Rev 0; 1/03 KIT ATION EVALU E L B A AVAIL Ultra-High-Efficiency White LED Drivers General Description Feature...
Datasheet PDF File MAX1984 PDF File

MAX1984
MAX1984

Overview
19-2761; Rev 0; 1/03 KIT ATION EVALU E L B A AVAIL Ultra-High-Efficiency White LED Drivers General Description 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 o o o Up to 90% Total LED Efficiency Accurate LED Current Matching (8% max) Adjustable Maximum LED Current 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 MAX1984/MAX1985/MAX1986 The MAX1984/MAX1985/MAX1986 are white light-emitting 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 dimming 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 multimode 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 h...


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