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MAX1698

MAX1698, MAX1698A

High-Efficiency Step-Up Current Regulator for LEDs

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Overview

Description

The MAX1698 and MAX1698A are efficient drivers for white or color LEDs. They are ideal for large LED backlit displays in PDAs and laptop computers. Numerous benefits include greater simplicity, lower cost, higher efficiency, longer bulb life, and greater reliability when compared to fluorescent (CCFL) and electroluminescent (EL) lamps.

The MAX1698/MAX1698A are switch-mode boost controllers in which LED current, rather than output voltage, is regulated The devices drive series-connected LEDs with a controlled current that is measured with a typically 15Ω sense resistor, not an expensive fractional-ohm value. LED current control and dimming are accomplished with an adjust input (ADJ). For larger light output, multiple LED banks can be connected in parallel with up to 5W total output power.

The MAX1698A has a higher, and more accurately specified, CS current limit than the MAX1698 for higherpower applications of 5W or more. Both devices are supplied in a space-saving 10-pin µMAX package that occupies half the space of an 8-pin SO. An evaluation kit (MAX1698EVKIT) is available to speed designs.
MAX1698, MAX1698A: Typical Operating Circuit MAX1698, MAX1698A: Typical Operating Circuit Enlarge+

Key Features

  • Over 90% Efficiency
  • Lossless, Adjustable LED Brightness
  • Space-Saving 10-Pin µMAX Package
  • Simpler, Lower Cost, More Reliable Compared to CCFL or EL Backlights
  • Up to 5W Output Power

Applications/Uses

  • Backlight for LCD Panels
  • Battery-Powered Backlight Applications
  • Cell Phones
  • Handy Terminals
  • PDAs

Parametric Specs

See parametric specs for LED Drivers (83)


Part NumberVIN
(V)		VIN
(V)		Max. No. of LEDs# LED ChannelsRegulation Topology
(min)(max)
MAX1698 2.75.5504Inductor Based

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources


MAX1698EVKIT: Evaluation Kit for the MAX1698

Technical Documents

App Note 4913 A Simple Implementation of LCD Brightness Control Using the MAX44009 Ambient-Light Sensor
App Note 4576 Protect LED Driver in Backlit Displays
App Note 3866 Low-Power PWM Output Controls LED Brightness
App Note 1871 Single FET Controls 2nd LED Array in Switch-Mode LED Backlight
App Note 1862 Circuit Drives Mixed Types and Quantities of LEDs
App Note 940 Feedback Circuit Enhances Efficiency of Boost-Converter Current Source

Quality And Environmental

Product Reliability Reports: MAX1698.pdf 
Request Reliability Report for: MAX1698A 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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Technical Docs

Reference Designs

Type ID Title
Evaluation Board2252MAX1698EVKIT Evaluation Kit for the MAX1698
Evaluation Board2252MAX1698_EVKIT Evaluation Kit for the MAX1698