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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1779 Datasheet

Low-Power Triple-Output TFT LCD DC-DC Converter

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MAX1779 pdf
19-1795; Rev 0; 11/00
Low-Power Triple-Output TFT LCD DC-DC
Converter
General Description
The MAX1779 triple-output DC-DC converter provides
highly efficient regulated voltages required by small
active matrix, thin-film transistor (TFT) liquid-crystal dis-
plays (LCDs). One high-power DC-DC converter and
two low-power charge pumps convert the +2.7V to
+5.5V input supply voltage into three independent out-
put voltages.
The primary high-power DC-DC converter generates a
boosted output voltage (VMAIN) up to 13V that is regu-
lated within ±1%. The low-power BiCMOS control cir-
cuitry and the low on-resistance (1) of the integrated
power MOSFET allows efficiency up to 91%. The
250kHz current-mode pulse-width modulation (PWM)
architecture provides fast transient response and
allows the use of ultra-small inductors and ceramic
capacitors.
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 regu-
late output voltages up to +40V and down to -40V. A
proprietary regulation algorithm minimizes output rip-
ple, as well as capacitor sizes for both charge pumps.
The MAX1779 is available in the ultra-thin TSSOP pack-
age (1.1mm max height).
Features
o Three Integrated DC-DC Converters
o 250kHz Current-Mode PWM Boost Regulator
Up to +13V Main High-Power Output
±1% Accuracy
High Efficiency (91%)
o Dual Charge-Pump Outputs
Up to +40V Positive Charge-Pump Output
Down to -40V Negative Charge-Pump Output
o Internal Supply Sequencing
o Internal Power MOSFETs
o +2.7V to +5.5V Input Supply
o 0.1µA Shutdown Current
o 0.5mA Quiescent Current
o Internal Soft-Start
o Power-Ready Output
o Ultra-Small External Components
o Thin TSSOP Package (1.1mm max)
PART
MAX1779EUE
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 TSSOP
________________________Applications
TFT Active-Matrix LCD Displays
Passive-Matrix LCD Displays
PDAs
Digital-Still Cameras
Camcorders
Typical Operating Circuit appears at end of data sheet.
Pin Configuration
TOP VIEW
RDY 1
FB 2
INTG 3
IN 4
GND 5
REF 6
FBP 7
FBN 8
MAX1779
TSSOP
16 TGND
15 LX
14 PGND
13 SUPP
12 DRVP
11 SUPN
10 DRVN
9 SHDN
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1779 Datasheet

Low-Power Triple-Output TFT LCD DC-DC Converter

No Preview Available !

MAX1779 pdf
Low-Power Triple-Output TFT LCD DC-DC
Converter
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, TGND 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
RDY to GND ...........................................................-0.3V to +14V
LX, SUPP, SUPN to PGND .....................................-0.3V to +14V
INTG, REF, FB, FBN, FBP to GND ...............-0.3V to (VIN + 0.3V)
Continuous Power Dissipation (TA = +70°C)
16-Pin TSSOP (derate 9.4mW/°C above +70°C) ..........755mW
Operating Temperature Range
MAX1779EUE ..................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
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 = +10V, TGND = PGND = GND, CREF = 0.22µF, CINTG = 2200pF, TA = 0°C to +85°C,
unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Supply Range
VIN
2.7 5.5 V
Input Undervoltage Threshold
IN Quiescent Supply Current
VUVLO
IIN
VIN rising, 40mV hysteresis (typ)
VFB = VFBP = +1.5V, VFBN = -0.2V
2.2 2.4 2.6
V
0.5 1 mA
SUPP Quiescent Current
ISUPP VFBP = +1.5V
0.25 0.55 mA
SUPN Quiescent Current
IN Shutdown Current
SUPP Shutdown Current
ISUPN
VFBN = -0.1V
V SHDN = 0, VIN = +5V
V SHDN = 0, VSUPP = +13V
0.25
0.1
0.1
0.55
10
10
mA
µA
µA
SUPN Shutdown Current
MAIN BOOST CONVERTER
V SHDN = 0, VSUPN = +13V
0.1 10 µA
Output Voltage Range
VMAIN
VIN 13 V
FB Regulation Voltage
VFB
1.235 1.248 1.261
V
FB Input Bias Current
IFB VFB = +1.25V, INTG = GND
-50 50 nA
Operating Frequency
fOSC
212 250 288 kHz
Oscillator Maximum Duty Cycle
79 85 92 %
Load Regulation
IMAIN = 0 to 50mA, VMAIN = +5V
0.1 %
Line Regulation
0.1 % / V
Integrator Gm
320 µs
LX Switch On-Resistance
LX Leakage Current
RLX(ON)
ILX
ILX = 100mA
VLX = +13V
1.0
0.01
2.0
20
µA
LX Current Limit
Maximum RMS LX Current
ILIM
350 450 650 mA
250 mA
FB Fault Trip Level
Falling edge
1.07 1.1 1.14
V
POSITIVE CHARGE PUMP
VSUPP Input Supply Range
VSUPP
2.7 13 V
2 _______________________________________________________________________________________


Part Number MAX1779
Description Low-Power Triple-Output TFT LCD DC-DC Converter
Maker Maxim
Total Page 18 Pages
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