MAX1778EUG ,Quad-Output TFT LCD DC-DC Converters with BufferApplicationsTFT LCD Notebook DisplaysTypical Operating Circuit appears at end of data sheet.TFT LCD ..
MAX1778EUG ,Quad-Output TFT LCD DC-DC Converters with Bufferapplications, an exter-nal transistor can be added. Additionally, the VCOMbuffer provides a high cu ..
MAX1778EUG+ ,Quad-Output TFT LCD DC-DC Converters with BufferFeaturesThe MAX1778/MAX1880–MAX1885 multiple-output ● 500kHz/1MHz Current-Mode PWM Step-Up Regulato ..
MAX1778EUG+ ,Quad-Output TFT LCD DC-DC Converters with Bufferapplications, an external transistor can be added. Additionally, the VCOM buffer MAX1778EUG -40°C t ..
MAX1778EUG+T ,Quad-Output TFT LCD DC-DC Converters with BufferApplicationsTypical operating Circuit appears at end of data sheet.● TFT LCD Notebook DisplaysPin C ..
MAX1778EUG-T ,Quad-Output TFT LCD DC-DC Converters with BufferElectrical Characteristics(V = +3.0V, SHDN = IN, V = V = V = V = 10V, LDOOUT = FBL, BUF- = BUFOUT, ..
MAX4614CSD+T ,Low-Voltage, High-Speed, Quad, SPST CMOS Analog SwitchesFeaturesThe MAX4614/MAX4615/MAX4616 quad, low-voltage,♦ Fast Switching Times high-speed, single-pol ..
MAX4614CUD ,Low-Voltage, High-Speed, Quad, SPST CMOS Analog SwitchesMAX4614/MAX4615/MAX461619-1501; Rev 0; 7/99Low-Voltage, High-Speed, Quad, SPST CMOS Analog Switches
MAX4614CUD ,Low-Voltage, High-Speed, Quad, SPST CMOS Analog SwitchesFeaturesThe MAX4614/MAX4615/MAX4616 quad, low-voltage,♦ Fast Switching Times high-speed, single-pol ..
MAX4614CUD+ ,Low-Voltage, High-Speed, Quad, SPST CMOS Analog SwitchesFeaturesThe MAX4614/MAX4615/MAX4616 quad, low-voltage,♦ Fast Switching Times high-speed, single-pol ..
MAX4614CUD+ ,Low-Voltage, High-Speed, Quad, SPST CMOS Analog SwitchesELECTRICAL CHARACTERISTICS—Single +5V Supply(V+ = +5V ±10%, V = 2.4V, V = 0.8V, T = T to T , unless ..
MAX4614ESD ,Low-Voltage, High-Speed, Quad, SPST CMOS Analog SwitchesELECTRICAL CHARACTERISTICS—Single +5V Supply(V+ = +5V ±10%, V = 2.4V, V = 0.8V, T = T to T , unless ..
MAX1778EUG
Quad-Output TFT LCD DC-DC Converters with Buffer
General DescriptionThe 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 architec-
ture 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 (0.35ΩN-channel MOSFET) enable efficien-
cies up to 91%.
The dual low-power charge pumps (MAX1778/
MAX1880/MAX1881/MAX1882 only) independently reg-
ulate one positive output (VPOS) and one negative out-
put (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 exter-
nal 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 con-
ditions 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).
ApplicationsTFT LCD Notebook Displays
TFT LCD Desktop Monitor Panels
Features500kHz/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 OutputLow-Dropout 40mA Linear Regulator
(MAX1778/MAX1881/MAX1883/MAX1884 only)
Up to +15V LDO InputOptional Higher Current with External Transistor2.7V to 5.5V Input SupplyInternal Supply Sequencing and Soft-StartPower-Ready OutputAdjustable Fault-Detection LatchThermal Protection (+160°C)0.1µA Shutdown Current0.7mA IN Quiescent CurrentUltra-Small External ComponentsThin TSSOP Package (1.1mm max height)
MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC-DC
Converters with Buffer19-1979; Rev 0a; 3/01
Ordering Information
Typical Operating Circuit appears at end of data sheet.
Pin Configurations and Selector Guide appear at end of
data sheet.
MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC-DC
Converters with Buffer
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= +3.0V, SHDN= IN, VSUPP= VSUPN= VSUPB= VSUPL= 10V, LDOOUT = FBL, BUF- = BUFOUT, BUF+ = FLTSET = TGND =
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN, SHDN, TGND, FLTSET to GND...........................-0.3V to +6V
DRVN to GND.........................................-0.3V to (VSUPN+ 0.3V)
DRVP to GND..........................................-0.3V to (VSUPP+ 0.3V)
PGND to GND.....................................................................±0.3VRDY, SUPB to GND................................................-0.3V to +14V
LX, SUPP, SUPN to PGND.....................................-0.3V to +14V
SUPL to GND..........................................................-0.3V to +18V
LDOOUT to GND....................................-0.3V to (VSUPL+ 0.3V)
INTG, REF, FB, FBN, FBP to GND...............-0.3V to (VIN+ 0.3V)
FBL to GND.............-0.3V to the lower of (VSUPL+ 0.3V) or +6V
BUFOUT, BUF+, BUF- to GND...............-0.3V to (VSUPB+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
20-Pin TSSOP (derate 10.9mW/°C above +70°C)......879mW
24-Pin TSSOP (derate 12.2mW/°C above +70°C)......975mW
Operating Temperature Range
MAX1778EUG, MAX1883EUP........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC-DC
Converters with Buffer
ELECTRICAL CHARACTERISTICS (continued)(VIN= +3.0V, SHDN= IN, VSUPP= VSUPN= VSUPB= VSUPL= 10V, LDOOUT = FBL, BUF- = BUFOUT, BUF+ = FLTSET = TGND =
PGND = GND, CREF= 0.22µF, CBUF= 1µF, TA
= 0°C to +85°C. Typical values are at TA= +25°C, unless otherwise noted.)
MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC-DC
Converters with Buffer
ELECTRICAL CHARACTERISTICS (continued)(VIN= +3.0V, SHDN= IN, VSUPP= VSUPN= VSUPB= VSUPL= 10V, LDOOUT = FBL, BUF- = BUFOUT, BUF+ = FLTSET = TGND =
PGND = GND, CREF= 0.22µF, CBUF= 1µF, TA
= 0°C to +85°C. Typical values are at TA= +25°C, unless otherwise noted.)
MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC-DC
Converters with Buffer
ELECTRICAL CHARACTERISTICS (continued)(VIN= +3.0V, SHDN= IN, VSUPP= VSUPN= VSUPB= VSUPL= 10V, LDOOUT = FBL, BUF- = BUFOUT, BUF+ = FLTSET = TGND =
PGND = GND, CREF= 0.22µF, CBUF= 1µF, TA
= 0°C to +85°C. Typical values are at TA= +25°C, unless otherwise noted.)
Dual Mode is a registered trademark of Maxim Integrated Products, Inc.
