ENGLISH • 简体中文 • 日本語 • 한국어  

    Login | Register 


   
 
Enter keywords or part number    


What's New Products Solutions Design AppNotes Support Sales About Us Members

Maxim > Products > [Power and Battery Management] 
MAX1778, MAX1880, MAX1881, MAX1882, MAX1883, MAX1884, MAX1885
Quad-Output TFT LCD DC-DC Converters with Buffer


  QuickView     Technical Documents     Ordering Info     More Information     User Comments (0)     All  
Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 616kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1778/MAX1880–MAX1885 multiple-output DC-DC converters provide the regulated voltages required by active matrix thin-film transistor (TFT) liquid crystal displays (LCD) in a low-profile TSSOP package. One high-power step-up converter and two low-power charge pumps convert the 2.7V to 5.5V input voltage into three independent output voltages. A built-in linear regulator and VCOM buffer complete the power-supply requirements.

The main step-up converter accurately generates an externally set output voltage up to 13V that can supply the display's row/column drivers. The converter's high switching frequency and current-mode PWM architecture provide fast transient response and allow the use of small low-profile inductors and ceramic capacitors. The low-power BiCMOS control circuitry and internal 14V switch (0.35≈ N-channel MOSFET) enable efficiencies up to 91%.

The dual low-power charge pumps (MAX1778/ MAX1880/MAX1881/MAX1882 only) 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 -40V. A unique control scheme minimizes output ripple as well as capacitor sizes for both charge pumps.

A resistor-programmable, 40mA, low-dropout linear regulator (MAX1778/MAX1881/MAX1883/MAX1884 only) provides preregulation or postregulation for any of the supplies. For higher current applications, an external transistor can be added. Additionally, the VCOM buffer provides a high current output that is ideal for driving the capacitive backplane of TFT LCD panels. The VCOM buffer's output voltage is preset with an internal 50% resistive-divider or can be externally adjusted for other voltages.

The MAX1778/MAX1880–MAX1885 are protected against output undervoltage and thermal overload conditions by a latched fault detection circuit that shuts down the device. All devices are available in the ultra-thin TSSOP package (1.1mm max height).

An evaluation kit is available:  MAX1778EVKIT  

Key Features   Applications/Uses
  • 500kHz/1MHz Current-Mode PWM Step-Up Regulator
    • Up to +13V Main High-Power Output
    • ±1% Accurate
    • High Efficiency (91%)
  • Dual Regulated Charge-Pump Outputs (MAX1778/MAX1880/MAX1881/MAX1882 only)
    • Up to +40V Positive Charge-Pump Output
    • Up to -40V Negative Charge-Pump Output
  • Low-Dropout 40mA Linear Regulator (MAX1778/MAX1881/MAX1883/MAX1884 only)
    • Up to +15V LDO Input
  • Optional Higher Current with External Transistor
  • 2.7V to 5.5V Input Supply
  • Internal Supply Sequencing and Soft-Start
  • Power-Ready Output
  • Adjustable Fault-Detection Latch
  • Thermal Protection (+160°C)
  • 0.1µA Shutdown Current
  • 0.7mA IN Quiescent Current
  • Ultra-Small External Components
  • Thin TSSOP Package (1.1mm max height)

 
  		• TFT LCD Desktop Monitor Panels
  		• TFT LCD Notebook 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
    MAX1778  Step-Up Shutdown
    Current Limit
    Fixed Freq./PWM
    Internal Pwr. FETs
    Soft Start
    TFT Bias
    VCOM Buffer
    		 2.7 5.5 2.7 13 0.75 0.75 1000
    TSSOP/24
    		 52 $3.62 @1k
    MAX1880  1000
    TSSOP/24
    		 52 $3.51 @1k
    MAX1881  500
    TSSOP/24
    		 52 -
    MAX1882  500
    TSSOP/24
    		 52 -
    MAX1883  1000
    TSSOP/20
    		 45 -
    MAX1884  500
    TSSOP/20
    		 45 -
    MAX1885  500
    TSSOP/20
    		 45 -
    See All Multifunction PMICs (83)

    Diagram
    MAX1778, MAX1880, MAX1881, MAX1882, MAX1883, MAX1884, MAX1885: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX1778EVKIT

    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: 1-15 of 15

    MAX1778 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1778EUG    
    		Active TSSOP;24 pin;52 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0118 (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1778EUG-T    
    		Active TSSOP;24 pin;52 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0118 (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1778EUG+  
    		Active TSSOP;24 pin;52 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0118 (PDF)
    Use pkgcode/variation: U24+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1778EUG+T    
    		Active TSSOP;24 pin;52 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0118 (PDF)
    Use pkgcode/variation: U24+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1880 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1880EUG    
    		Active TSSOP;24 pin;52 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0118 (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1880EUG-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1880EUG+  
    		Active TSSOP;24 pin;52 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0118 (PDF)
    Use pkgcode/variation: U24+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1880EUG+T    
    		Active TSSOP;24 pin;52 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0118 (PDF)
    Use pkgcode/variation: U24+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1881 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1881EUG    
    		Active TSSOP;24 pin;52 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0118 (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1881EUG-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1882 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1882EUG    
    		Active TSSOP;24 pin;52 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0118 (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1883 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1883EUP    
    		Active TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1883EUP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1884 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1884EUP    
    		Active TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1885 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1885EUP    
    		Active TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    Related Products

    More Like This: View Product Families for Similar Products

    Didn't Find What You Need?
  • Next Day Product Selection Assistance from Applications Engineers
  • Parametric Search
  • Applications Help

    •  QuickView   Technical Documents   Ordering Info   More Information  
     Description 
     Key Features 
     Applications/Uses 
     Key Specifications 
     Diagram 

    		 Data Sheet 
     Application Notes 
     Design Guides 
     Engineering Journals 
     Reliability Reports 
     Software/Models 
     Evaluation Kits 

    		 Price and Availability 
     Samples 
     Buy Online 
     Package Information 
     Lead-Free Information 

    		 Related Products 
     Notes and Comments 
     Evaluation Kits 

    Document Ref.: 19-1979; Rev 1; 2005-09-20
    This page last modified: 2007-07-24


            •         •         •     Privacy Policy     •     Legal Notices

        Copyright © 2009 by Maxim Integrated Products