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MAX1889
Triple-Output TFT LCD Power Supply with Fault Protection


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Data Sheet
FULL DATA SHEET (PDF, 804kB)
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Description
The MAX1889 provides the three regulated output voltages required for active matrix, thin-film transistor liquid crystal displays (TFT LCDs). It combines a high-performance step-up regulator with two linear-regulator controllers and multiple levels of protection circuitry for a complete power-supply system.

The main DC-DC converter is a high-frequency (500kHz/1MHz), current-mode step-up regulator with an integrated N-channel power MOSFET that allows the use of ultra-small inductors and ceramic capacitors. With its high closed-loop bandwidth performance, the MAX1889 provides fast transient response to pulsed loads while operating with efficiencies over 85%. The positive and negative linear-regulator controllers post-regulate charge-pump outputs for TFT gate-on and gate-off supplies.

The MAX1889 has a unique input switch control that can replace the typical input fuse by disconnecting the load from the input supply when a fault is detected. The fault detector monitors all three regulated output voltages and can monitor current from the input supply as well. Additionally, the MAX1889 enters thermal shutdown when its overtemperature threshold is reached.

The MAX1889 undervoltage lockout is set at 2.5V (max) to allow the input supply to droop under pulsed load conditions while avoiding any unexpected behavior when its input voltage dips momentarily. Also, the built-in soft-start and cycle-by-cycle current limiting prevent input surge currents during power-up.

The MAX1889 is available in a 16-pin thin QFN package with a maximum thickness of 0.8mm for ultra-thin LCD panel design.

Key Features   Applications/Uses
  • High-Performance Step-Up Regulator
    • Fast Transient Response
    • Current-Mode Control Architecture
    • Built-In High-Efficiency N-Channel Power MOSFET
    • Current-Limit Comparator > 85% Efficiency
    • Selectable Switching Frequency (500kHz/1MHz)
    • Internal Soft-Start
  • Positive Linear-Regulator Controller
  • Negative Linear-Regulator Controller
  • Triple-Level Protection Against Smoke or Fire
    • Input Switch Replaces Input Fuse
    • Output Overload Detection with Timer Latch
    • Thermal Shutdown
  • 2.7V to 5.5V Input Operating Range
  • Ultra-Small External Components
  • 1µA Shutdown Current (max)
  • 1mA Quiescent Current (max)
  • Ultra-Thin 16-Pin QFN Package (0.8mm Maximum Thickness)

 
  • Car-Navigation Displays
  • LCD Monitors
  • Notebook Computer Displays

    Key Specifications:   Multifunction PMICs
    Part Number Primary Topology Monitor/Control Features DC-DC/Power Features LCD/LED/Flash/CCD Features VIN (min) (V) VIN (max) (V) Min. VOUT (V) Max. VOUT (V) IOUT (A) IOUT (A) Operating Freq. (kHz) Package Price**
    MAX1889  Step-Up Output UVP
    Reset Output
    Shutdown
    Adj. Frequency
    Current Limit
    Fixed Freq./PWM
    Internal Pwr. FETs
    Soft Start
    TFT Bias 2.7 5.5 2.7 13 0.3 0.3 1000 THIN QFN/16 $3.21 @ 1k
    See All Multifunction PMICs (75)
    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.

    Diagram
    MAX1889: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  • MAX1889EVKIT

    Reliability Reports
  • Show FIT data for:
  • Reliability Report: MAX1889ETE.pdf

    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

    MAX1889 Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1889ETE  
    THIN QFN;16 pin;
    Dwg: 21-0140 (PDF)
    Use pkgcode/variation: T1655-2*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1889ETE-T  
    THIN QFN;16 pin;
    Dwg: 21-0140 (PDF)
    Use pkgcode/variation: T1655-2*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1889ETE+  
    THIN QFN;16 pin;
    Dwg: 21-0140 (PDF)
    Use pkgcode/variation: T1655+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1889ETE+T  
    THIN QFN;16 pin;
    Dwg: 21-0140 (PDF)
    Use pkgcode/variation: T1655+2*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • New Product Press Release 2002-08-14 

    Related Products
    MAX1996A High-Efficiency, Wide Brightness Range, CCFL Backlight Controller
    MAX1790, MAX8715 Low-Noise Step-Up DC-DC Converters
    MAX1748, MAX8726 Triple-Output TFT-LCD DC-DC Converters
    MAX1895, MAX1995 High-Efficiency, Wide Brightness Range, CCFL Backlight Controllers
    MAX1778, MAX1880, MAX1881, MAX1882, MAX1883, MAX1884, MAX1885 Quad-Output TFT LCD DC-DC Converters with Buffer

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    Document Ref.: 19-2485; Rev 1; 2002-12-10
    This page last modified: 2008-03-12



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