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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 344kB) Download   E-Mail

Description

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 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 x 4mm thin QFN package.

Key Features		Applications/Uses
Synchronous Step-Up Regulator Achieves >95% Efficiency Internal Switch and Synchronous Rectifier Eliminates External MOSFETs and Diodes 1MHz Fixed Frequency Minimizes Component Sizes 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 Selectively Enable LEDs Open-LED Detection Unique 0.5mA LED Test Mode 2.7V to 5.5V Input Supply Range Small 4mm x 4mm 20-Pin Thin QFN Package		Cell Phones Digital Cameras PDAs and Handheld PCs

Diagram

Pin Configuration

Reliability Reports

Show FIT data for: MAX1984 MAX1985 MAX1986 Request Reliability Report for: MAX1984 MAX1985 MAX1986 MAX1984ETP

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-12 of 12

MAX1984ETP	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1984ETP+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1984ETP+			Active	TQFN;20 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0037 (PDF) Use pkgcode/variation: T2044+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1984ETP			Active	TQFN;20 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0037 (PDF) Use pkgcode/variation: T2044-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1984ETP-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1985	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1985ETP+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1985ETP+			Active	TQFN;20 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0037 (PDF) Use pkgcode/variation: T2044+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1985ETP			Active	TQFN;20 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0037 (PDF) Use pkgcode/variation: T2044-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1985ETP-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1986	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1986ETE+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1986ETE+			Active	TQFN;16 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0070 (PDF) Use pkgcode/variation: T1644+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1986ETE			Active	TQFN;16 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0070 (PDF) Use pkgcode/variation: T1644-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1986ETE-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet

More Information

New Product Press Release 2003-03-03

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