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


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Data Sheet
FULL DATA SHEET (PDF, 616kB)
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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).

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 PMIC for: 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) Operating Freq. (kHz) Number of Step-Up Outputs Number of Inverting Outputs Number of LDO Outputs Number of Op Amp Outputs Output Adj. Method Operating Current, ICC (max) (mA) EV-Kit Package RoHS Available Operating Temp. Range (°C) Price**
    MAX1778  LCD Step-Up Shutdown Current Limit
    Fixed Frequency/PWM
    Internal Power Switches
    Soft Start     		TFT Bias
    VCOM Buffer     		2.7 5.5 2.7 13 0.75 1000 2 1 1 1 Resistor 1 No TSSOP/24 Yes -40 to +85 $3.62 @ 1k
    MAX1880  1000 2 1  -   -  TSSOP/24 Yes $3.51 @ 1k
    MAX1881  500 2 1 1 1 TSSOP/24 No  
    MAX1882  500 2 1  -  1 TSSOP/24 No  
    MAX1883  1000 1  -  1 1 TSSOP/20 No  
    MAX1884  500 1  -  1 1 TSSOP/20 No  
    MAX1885  500 1  -   -  1 TSSOP/20 See Data Sheet  
    See All Multifunction PMICs (71)

    Key Specifications:   Switch-Mode DC-DC Power Supplies
    Part Number Topology VIN (min) (V) VIN (max) (V) Number of DC-DC Outputs Digital/VID Programmed Output Min. Adjustable VOUT (V) Max. Adjustable VOUT (V) IOUT (A) Operating Current, ICC (max) (mA) Operating Freq. (kHz) Internal Power Switch(es) Package Price**
    MAX1778  Step-Up 2.7 5.5 3 No 2.7 13 0.75 1 1000 Yes TSSOP/24 $3.62 @ 1k
    MAX1880  3 1000 TSSOP/24 $3.51 @ 1k
    MAX1881  3 500 TSSOP/24  
    MAX1882  3 500 TSSOP/24  
    MAX1883  1 1000 TSSOP/20  
    MAX1884  1 500 TSSOP/20  
    MAX1885  1 500 TSSOP/20  
    See All Switch-Mode DC-DC Power Supplies (429)
    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
    MAX1778, MAX1880, MAX1881, MAX1882, MAX1883, MAX1884, MAX1885: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX1778EVKIT

    Reliability Reports
  		• Show FIT data for:
  		• Reliability Report: MAX1880EUG.pdf MAX1883EUP.pdf
  		• 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: 1-18 of 18

    MAX1778 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1778EUG  
    		TSSOP;24 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1778EUG+  
    		TSSOP;24 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U24+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1778EUG+T  
    		TSSOP;24 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U24+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1778EUG-T  
    		TSSOP;24 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1880 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1880EUG-T  
    		TSSOP;24 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1880EUG  
    		TSSOP;24 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1880EUG+T  
    		TSSOP;24 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U24+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1880EUG+  
    		TSSOP;24 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U24+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1881 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1881EUG  
    		TSSOP;24 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1881EUG-T  
    		TSSOP;24 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1882 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1882EUG  
    		TSSOP;24 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1882EUG-T  
    		TSSOP;24 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U24-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1883 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1883EUP-T  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1883EUP  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1884 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1884EUP-T  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1884EUP  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1885 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1885EUP  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1885EUP-T  



    		-40°C to +85°C See data sheet

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




             


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