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High-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting

First Dual-Output, White LED Driver for Main and Sub-Displays Reduces Power by 25%

Product Details

Key Features

Simplified Block Diagram

Technical Docs

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Key Features

  • Accurate Current Regulation for Uniform Illumination
  • Lights Up Two LED Sections for Main and Subdisplays
  • Up to 84% Efficiency
  • Internal High-Power, 30V MOSFET
  • Low 15mVP-P Input Ripple
  • Flexible Dimming Control
    • Analog DAC Controlled
    • Direct-Digital PWM (No RC Required) from 200Hz to 200kHz
  • Overvoltage Protection to Eliminate Zener Diode
  • Constant 1MHz PWM Operation
  • Low-Profile Inductor and Capacitors
  • Soft-Start Eliminates Inrush Current
  • 2.6V to 5.5V Input
  • 0.01µA (typ) Shutdown Current
  • Tiny UCSP (2.1mm x 2.1mm x 0.61mm) and Thin QFN (4mm x 4mm) Packages

Applications/Uses

  • Cell Phones with One or Two Displays
  • Other Handheld Devices with Dual Displays
  • Smartphones, Palmtops, and Wireless Handhelds

Description

The MAX1582/MAX1582Y drive up to six white LEDs in series with a constant current to provide display backlighting for two (main and sub-) displays in cell phones and other handheld devices. This configuration eliminates the need for ballast resistors and expensive factory calibration. The proprietary dual-output, step-up pulse-width modulation (PWM) converter includes a low RDSON n-channel MOSFET switch for high efficiency and maximum battery life.

The MAX1582/MAX1582Y utilize 1MHz current-mode PWM control to allow small input and output capacitors and a small inductor, while minimizing ripple on the input supply and avoiding interference to sensitive circuitry in the equipment. Integrated overvoltage protection (27V for the MAX1582 and 18V for the MAX1582Y) eliminates the need for an external zener diode to protect the IC from open circuit. Flexible dimming control utilizes either an analog control signal or direct digital PWM control without external RC filtering. This also increases dimming accuracy at low brightness levels. The PWM dimming signal can be any frequency from 200Hz to 200kHz. Softstart eliminates inrush current during startup.

The MAX1582/MAX1582Y are available in tiny 4 x 4 chip-scale (UCSP™) and 12-pin thin QFN packages.

Simplified Block Diagram

MAX1582: Typical Application Circuit MAX1582: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.