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Maxim > Products > [Power and Battery Management]  [LED Lighting and LCD Display ICs] 
MAX1748, MAX8726
Triple-Output TFT-LCD DC-DC Converters


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 228kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1748/MAX8726 triple-output DC-DC converters in a low-profile TSSOP package provide the regulated voltages required by active-matrix, thin-film transistor (TFT) liquid-crystal displays (LCDs). One high-power DC-DC converter and two low-power charge pumps convert the +3.3V to +5V input supply voltage into three independent output voltages.

The primary 1MHz DC-DC converter generates a boosted output voltage (VMAIN) up to 13V using ultra-small inductors and ceramic capacitors. The low-power BiCMOS control circuitry and the low on-resistance (0.35Ω) of the integrated power MOSFET allows efficiency up to 93%.

The dual charge pumps independently regulate one positive output (VPOS) and one negative output (VNEG). These low-power outputs use external diode and capacitor stages (as many stages as required) to regulate output voltages up to +40V and down to -40V. A proprietary regulation algorithm minimizes output ripple, as well as capacitor sizes for both charge pumps.

For both the MAX1748 and MAX8726, the supply sequence is VMAIN first, VNEG next, and finally VPOS. The MAX1748 soft-starts each supply as soon as the previous supply finishes. The MAX8726 adds a delay between the startups of VMAIN and VNEG and also between VNEG and VPOS.

The MAX1748/MAX8726 are available in the ultra-thin TSSOP package (1.1mm max height).

An evaluation kit is available:  MAX1748EVKIT  

Key Features   Applications/Uses
  • Three Integrated DC-DC Converters
  • 1MHz Current-Mode PWM Boost Regulator
    • Up to +13V Main High-Power Output
    • ±1% Accuracy
    • High Efficiency (93%)
  • Dual Charge-Pump Outputs
    • Up to +40V Positive Charge-Pump Output
    • Down to -40V Negative Charge-Pump Output
  • Internal Supply Sequencing
  • Internal Power MOSFETs
  • +2.7V to +5.5V Input Supply
  • 0.1µA Shutdown Current
  • 0.6mA Quiescent Current
  • Internal Soft-Start
  • Power-Ready Output
  • Ultra-Small External Components
  • Thin TSSOP Package (1.1mm max)

 
  		• Camcorders
  		• Digital Still Cameras
  		• Passive-Matrix LCD Displays
  		• PDAs
  		• TFT Active-Matrix LCD Displays

    Key Specifications:  Multifunction PMICs
    Part Number Primary Topology Monitor/Control Features DC-DC/Power Features LCD/LED/Flash/CCD Features VIN
    (V)    		 VIN
    (V)    		 VOUT
    (V)    		 VOUT
    (V)    		 Max. IOUT
    (A)    		 Max. IOUT
    (A)    		 Oper. Freq.
    (kHz)    		 Package/Pins Smallest Available Pckg.
    (mm2)    		 Price
    min max min max ≥ ≤ max w/pins See Notes
    MAX1748  Step-Up Shutdown
    Fixed Freq./PWM
    Internal Pwr. FETs
    Soft Start
    		 TFT Bias 2.7 5.5 2.7 13 0.5 0.5 1000
    TSSOP/16
    		 33 $3.07 @1k
    See All Multifunction PMICs (83)

    Diagram
    MAX1748,MAX8726: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX1748EVKIT

    Design Guides
  		• Displays (PDF)

    Reliability Reports
  		• Show FIT data for:
  		• Request Reliability Report for:

    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: 1-6 of 6

    MAX1748 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1748EUE    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1748EUE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1748EUE+  
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1748EUE+T    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8726 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8726EUE    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8726EUE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

    More Information
  		• New Product Press Release 2004-11-19 

    Related Products
    MAX1664 Active Matrix Liquid Crystal Display (AMLCD) Supply
    MAX1779 Low-Power Triple-Output TFT LCD DC-DC Converter
    MAX1889 Triple-Output TFT LCD Power Supply with Fault Protection
    MAX1790, MAX8715 Low-Noise Step-Up DC-DC Converters
    MAX1997, MAX1998 Quintuple/Triple-Output TFT LCD Power Supplies with Fault Protection and VCOM Buffer
    MAX1778, MAX1880, MAX1881, MAX1882, MAX1883, MAX1884, MAX1885 Quad-Output TFT LCD DC-DC Converters with Buffer

    More Like This: View Product Families for Similar Products

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    Document Ref.: 19-1740; Rev 0; 2004-10-19
    This page last modified: 2007-12-14


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