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MAX1582

MAX1582

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%

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Overview

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.
MAX1582: Typical Application Circuit MAX1582: Typical Application Circuit Enlarge+

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

Design Resources

Technical Documents

App Note 3174 Selecting Power Management for Cellular Handsets

Quality And Environmental

Product Reliability Reports: MAX1582.pdf 
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

Type ID Title
App Note 3174 Selecting Power Management for Cellular Handsets

Reference Designs

Type ID Title
Evaluation Board3898MAX1582EVKIT Evaluation Kit for the MAX1582