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MAX8901, MAX8901A, MAX8901B
Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package

Drive a String of 2 to 6 WLEDs for 1.5in to 4in LCD Backlighting Used in Battery Operated Devices


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Data Sheet
FULL DATA SHEET (PDF, 300kB)
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Description
The MAX8901A/MAX8901B step-up converters drive from two to six series-connected white LEDs (WLEDs) with constant current to provide uniform WLED intensity for LCD backlighting in cell phones, PDAs, and other handheld devices. The MAX8901_ operate at a fixed 750kHz (typ) switching frequency, allowing for tiny external components, and are optimized for the highest possible efficiency over the full 1-cell Li+/Li-Poly battery range.

These converters use a single input (ON) to enable the IC and to control WLED intensity. The MAX8901A requires a direct PWM input to regulate WLED intensity with the WLED current proportional to the PWM duty cycle. The MAX8901B uses single-wire, serial-pulse dimming that reduces the WLED intensity in 32 linear steps. Full-scale WLED current for serial-pulse dimming is 24.75mA (MAX8901B, 0.75mA/step).

The MAX8901_ features an internal soft-start to eliminate inrush currents during startup, input overvoltage protection, WLED overvoltage protection, and a shutdown mode with 0.01µA (typ) shutdown current. No WLED current is present in shutdown provided the WLED forward voltage is greater than the input supply voltage. Additional features include undervoltage lockout (UVLO) and thermal shutdown.

The MAX8901_ are available in tiny 8-pin, 2mm x 2mm TDFN-EP packages (0.8mm max height).

Key Features   Applications/Uses
  • High Efficiency, Up to 91%
  • 2.6V to 5.5V Input Voltage Range
  • Fixed-Frequency Operation
  • Supplies from 2 to 6 WLEDs with 1.3% LED Current Accuracy
  • Flexible Dimming Control
    • Direct PWM Dimming (MAX8901A)
    • 32-Step, Single-Wire Serial Dimming (MAX8901B)
  • Input Undervoltage Lockout
  • Input Overvoltage Lockout
  • WLED Overvoltage Protection (25V typ)
  • 0.01µA (typ) Shutdown Current
  • No WLED Current in Shutdown
  • Internal Soft-Start and Thermal Shutdown

 
  • Cellular Phones
  • Digital Cameras
  • Display Backlight (from 2 to 6 WLEDs)
  • MP3 and Portable Media Players
  • PDAs and Smartphones
  • Portable Navigation Devices

    Key Specifications:   White LED Drivers
    Part Number Topology Max. No. of LEDs Configuration Dimming Control VCURR_SENSE (mV) POUT (W) IMAX per LED (mA) Min. VIN (V) Max. VIN (V) ICC (max) (mA) Max. VOUT (V) Operating Freq. (kHz) Package Price**
    MAX8901  Inductor Based 6 Series PWM
    Serial Pulse
    500 0.6 25 2.6 5.5 0.135 24 750 THIN QFN (Dual)/8 $1.25 @ 1k
    See All White LED Drivers (44)
    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 prices and delivery, please see the price and availability page or contact an authorized distributor.

    Evaluation Kits
  • MAX8901EVKIT

    Design Guides
  • BATTERY MANAGEMENT (PDF)
  • DISPLAYS (PDF)
  • FLAT-PANEL DISPLAY (PDF)
  • POWER MANAGEMENT FOR BATTERY-POWERED EQUIPMENT (PDF)

    Reliability Reports
  • Show FIT data for:
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    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * 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: 1-4 of 4

    MAX8901A Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8901AETA+T  
    THIN QFN (Dual);8 pin;
    Dwg: 21-0168 (PDF)
    Use pkgcode/variation: T822+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8901AETA+  
    THIN QFN (Dual);8 pin;
    Dwg: 21-0168 (PDF)
    Use pkgcode/variation: T822+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8901B Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8901BETA+T  
    THIN QFN (Dual);8 pin;
    Dwg: 21-0168 (PDF)
    Use pkgcode/variation: T822+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8901BETA+  
    THIN QFN (Dual);8 pin;
    Dwg: 21-0168 (PDF)
    Use pkgcode/variation: T822+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • Topmark Coding: MAX8901
  • New Product Press Release 2007-09-04 
  • Product Ad: Download

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    Document Ref.: 19-0865; Rev 2; 2008-06-18
    This page last modified: 2008-06-18



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