datasheet4u.com

900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1778 Datasheet

Quad-Output TFT LCD DC/DC Converters

No Preview Available !

MAX1778 pdf
MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC/DC
Converters with Buffer
General 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 switch-
ing 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 (0.35Ω
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 capaci-
tor 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 ultrathin TSSOP package
(1.1mm max height).
Applications
● TFT LCD Notebook Displays
● TFT LCD Desktop Monitor Panels
Features
● 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–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)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1778EUG
-40°C to +85°C 24 TSSOP
MAX1778EUG+
-40°C to +85°C 24 TSSOP
MAX1880EUG
-40°C to +85°C 24 TSSOP
MAX1881EUG
-40°C to +85°C 24 TSSOP
MAX1882EUG
-40°C to +85°C 24 TSSOP
MAX1883EUP
-40°C to +85°C 20 TSSOP
MAX1884EUP
-40°C to +85°C 20 TSSOP
MAX1885EUP
-40°C to +85°C 20 TSSOP
+Denotes lead(Pb)-free/RoHS-compliant package.
Typical operating Circuit appears at end of data sheet.
Pin Configurations and Selector Guide appear at end of
data sheet.
19-1979; Rev 3; 4/15


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1778 Datasheet

Quad-Output TFT LCD DC/DC Converters

No Preview Available !

MAX1778 pdf
MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC/DC
Converters with Buffer
Absolute Maximum Ratings
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.....................................................................±0.3V
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
RDY, SUPB to GND................................................-0.3V to +14V
Operating Temperature Range
LX, SUPP, SUPN to PGND .....................................-0.3V to +14V
MAX1778EUG, MAX1883EUP.........................-40°C to +85°C
SUPL to GND..........................................................-0.3V to +18V
Junction Temperature.......................................................+150°C
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
Storage Temperature Range..............................-65°C to +150°C
Lead Temperature (soldering, 10s)...................................+300°C
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.
Electrical Characteristics
(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.)
PARAMETER
Input Supply Range
Input Undervoltage Threshold
IN Quiescent Supply Current
SUPP Quiescent Current
SUPN Quiescent Current
IN Shutdown Current
SUPP Shutdown Current
SUPN Shutdown Current
SUPL Shutdown Current
SUPB Shutdown Current
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
VIN 2.7 5.5 V
VUVLO VIN rising, 40mV hysteresis (typ)
2.2 2.4 2.6
V
MAX1778/MAX1880/
VFB = VFBP = MAX1883 (fOSC = 1MHz)
IIN 1.5V, VFBN = MAX1881/MAX1882/
-0.2V
MAX1884/MAX1885
(fOSC = 500kHz)
0.7 1
mA
0.6 1
ISUPP
ISUPN
VFBP = 1.5V
MAX1778/MAX1880
(fOSC = 1MHz)
MAX1881/MAX1882
(fOSC = 500kHz)
VFBN = -0.2V
MAX1778/MAX1880
(fOSC = 1MHz)
MAX1881/MAX1882
(fOSC = 500kHz)
VSHDN = 0, VIN = 5V
VSHDN = 0, VSUPP = 13V,
MAX1778/MAX1880/MAX1881/MAX1882
0.4 0.7
mA
0.3 0.5
0.4 0.7
mA
0.3 0.5
0.1 10
µA
0.1 10
µA
VSHDN = 0, VSUPN = 13V,
MAX1778/MAX1880/MAX1881/MAX1882
0.1 10
µA
VSHDN = 0, VSUPL = 13V
MAX1778/MAX1881/MAX1883/MAX1884
0.1 10
µA
VSHDN = 0, VSUPB = 13V
6 13 µA
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX1778
Description Quad-Output TFT LCD DC/DC Converters
Maker Maxim
Total Page 30 Pages
PDF Download
MAX1778 pdf
MAX1778 Datasheet PDF
[partsNo] view html
View PDF for Mobile








Similar Datasheet

1 MAX177 CMOS 10-Bit A/D Converter with Track-and-Hold Maxim
Maxim
MAX177 pdf
2 MAX1771 Step-Up DC-DC Controller Maxim
Maxim
MAX1771 pdf
3 MAX17710 Energy-Harvesting Charger and Protector Maxim Integrated
Maxim Integrated
MAX17710 pdf
4 MAX1772 Low-Cost / Multichemistry Battery- Charger Building Block Maxim
Maxim
MAX1772 pdf
5 MAX1773 Power Source Selector for Dual-Battery Systems Maxim
Maxim
MAX1773 pdf
6 MAX1774 Dual / High-Efficiency / Step-Down Converter Maxim
Maxim
MAX1774 pdf
7 MAX1775 Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers Maxim
Maxim
MAX1775 pdf
8 MAX1776 24V / 600mA Internal Switch / 100% Duty Cycle / Step-Down Converter Maxim
Maxim
MAX1776 pdf
9 MAX17761 Synchronous Step-Down DC-DC Converter Maxim Integrated
Maxim Integrated
MAX17761 pdf





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy