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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1748 Datasheet

Triple-Output TFT LCD DC-DC Converter

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MAX1748 pdf
19-3430; Rev 0; 10/04
EVAALVUAAILTAIOBNLEKIT
Triple-Output TFT-LCD
DC-DC Converters
General Description
The MAX1748/MAX8726 triple-output DC-DC converters
in a low-profile TSSOP package provide the regulated
voltages required by active-matrix, thin-film transistor
(TFT) liquid-crystal displays (LCDs). One high-power
DC-DC converter and two low-power charge pumps
convert the +3.3V to +5V input supply voltage into three
independent output voltages.
The primary 1MHz DC-DC converter generates a boost-
ed output voltage (VMAIN) up to 13V using ultra-small
inductors and ceramic capacitors. The low-power
BiCMOS control circuitry and the low on-resistance
(0.35Ω) of the integrated power MOSFET allows effi-
ciency up to 93%.
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.
For both the MAX1748 and MAX8726, the supply
sequence is VMAIN first, VNEG next, and finally VPOS.
The MAX1748 soft-starts each supply as soon as the
previous supply finishes. The MAX8726 adds a delay
between the startups of VMAIN and VNEG and also
between VNEG and VPOS.
The MAX1748/MAX8726 are available in the ultra-thin
TSSOP package (1.1mm max height).
Applications
TFT Active-Matrix LCD Displays
Passive-Matrix LCD Displays
PDAs
Digital Still Cameras
Camcorders
Typical Operating Circuit appears at end of data sheet.
Features
Three Integrated DC-DC Converters
1MHz Current-Mode PWM Boost Regulator
Up to +13V Main High-Power Output
±1% Accuracy
High Efficiency (93%)
Dual Charge-Pump Outputs
Up to +40V Positive Charge-Pump Output
Down to -40V Negative Charge-Pump Output
Internal Supply Sequencing
Internal Power MOSFETs
+2.7V to +5.5V Input Supply
0.1µA Shutdown Current
0.6mA Quiescent Current
Internal Soft-Start
Power-Ready Output
Ultra-Small External Components
Thin TSSOP Package (1.1mm max)
PART
MAX1748EUE
MAX8726EUE
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 TSSOP
16 TSSOP
Pin Configuration
TOP VIEW
RDY 1
FB 2
INTG 3
IN 4
GND 5
REF 6
FBP 7
FBN 8
MAX1748
MAX8726
16 TGND
15 LX
14 PGND
13 SUPP
12 DRVP
11 SUPN
10 DRVN
9 SHDN
TSSOP
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1748 Datasheet

Triple-Output TFT LCD DC-DC Converter

No Preview Available !

MAX1748 pdf
Triple-Output TFT-LCD
DC-DC Converters
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
MAX1748EUE/MAX8726EUE..........................-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 = 470pF, TA = 0°C to +85°C, unless
otherwise noted. Typical values are at TA = +25°C.)
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
MAIN BOOST CONVERTER
Output Voltage Range
FB Regulation Voltage
FB Input Bias Current
Operating Frequency
Oscillator Maximum Duty Cycle
Load Regulation
Line Regulation
Integrator Gm
LX Switch On-Resistance
LX Leakage Current
LX Current Limit
Maximum RMS LX Current
SYMBOL
VIN
VUVLO
IIN
ISUPP
ISUPN
VMAIN
VFB
IFB
fOSC
RLX(ON)
ILX
ILX(MAX)
CONDITIONS
VIN rising, 40mV hysteresis (typ)
VFB = VFBP = 1.5V, VFBN = -0.2V
VFBP = 1.5V
VFBN = -0.1V
V SHDN = 0, VIN = 5V
V SHDN = 0, VSUPP = 13V
V SHDN = 0, VSUPN = 13V
TA = 0°C to +85°C
VFB = 1.25V, INTG = GND
IMAIN = 0 to 200mA, VMAIN = 10V
ILX = 100mA
VLX = 13V
Phase I = soft-start (1.0ms)
Phase II = soft-start (1.0ms)
Phase III = soft-start (1.0ms)
Phase IV = fully on (after 3.0ms)
MIN TYP MAX UNITS
2.7 5.5 V
2.2 2.4 2.6
V
0.6 1 mA
0.4 0.8 mA
0.4 0.8 mA
0.1 10
µA
0.1 10
µA
0.1 10
µA
VIN
1.235
-50
0.85
78
0.275
1.1
1.248
1
85
0.2
0.1
320
0.35
0.01
0.380
0.75
1.12
1.5
1
13
1.261
+50
1.15
90
0.7
20
0.500
2.0
V
V
nA
MHz
%
%
%/V
µmho
Ω
µA
A
A
Soft-Start Period
FB Fault Trip Level
POSITIVE CHARGE PUMP
VSUPP Input Supply Range
tSS Power-up to the end of phase III
VSUPP
1.07
3072 /
fOSC
1.1
1.14
2.7 13.0
s
V
V
2 _______________________________________________________________________________________


Part Number MAX1748
Description Triple-Output TFT LCD DC-DC Converter
Maker Maxim
Total Page 16 Pages
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