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MAX1747EUP
Triple Charge-Pump TFT LCD DC-DC Converter
General DescriptionThe MAX1747 triple charge-pump DC-DC converter
provides the regulated voltages required by active
matrix thin-film transistor (TFT) liquid-crystal displays
(LCDs) in a low-profile TSSOP package. One high-
power and two low-power charge pumps convert the
+2.7V to +4.5V input supply voltage into three indepen-
dent output voltages.
The primary high-power charge pump generates an
output voltage (VOUT) between 4.5V and 5.5V that is
regulated within ±1%. The low-power BiCMOS control
circuitry and the low on-resistance (RON) power
MOSFETs maximize efficiency. The adjustable switch-
ing frequency (200kHz to 2MHz) provides fast transient
response and allows the use of small low-profile ceram-
ic capacitors.
The dual low-power charge pumps independently regu-
late one positive output (VPOS) and one negative output
(VNEG). These additional outputs use external diode
and capacitor multiplier stages (as many stages as
required) to regulate output voltages up to +35V and
-35V.
The constant switching frequency and a proprietary
regulation algorithm minimize output ripple and capaci-
tor sizes for all three charge pumps. The MAX1747 is
available in the ultra-thin TSSOP package (1.1mm max
height).
MAX1747riple Charge-Pump TFT LCD
DC-DC Converter
Pin Configuration19-1788; Rev 0; 10/00
Ordering Information
FeaturesAdjustable Outputs
Up to +5.5V Main High-Power Output
Up to +35V Positive Charge-Pump Output
Down to -35V Negative Charge-Pump Output200kHz to 2MHz Adjustable Switching Frequency+2.7V to +4.5V Input SupplyInternal Power MOSFETs0.1µA Shutdown CurrentInternal Soft-StartPower-Ready OutputInternal Supply SequencingFast Transient ResponseUltra-Thin Solution (No Inductors)Thin TSSOP Package (1.1mm max)
ApplicationsTFT Active-Matrix LCDs
Passive-Matrix Displays
Personal Digital Assistants (PDAs)
Typical Operating Circuit
MAX1747
Triple Charge-Pump TFT LCD
DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= VSUPM= +3.0V, VSUPP= VSUPN= +5V, TGND = PGND = GND, ISHDN= 22µA, COUT= 2 ✕4.7µF, CREF= 0.22µF, CINTG=
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, SUPM, OUT, TGND to GND................................-0.3V to +6VSHDN........................................................................-0.3V to +1V
PGND to GND.....................................................................±0.3V
SUPM to IN.........................................................................±0.3V
CXN to PGND.........................................-0.3V to (VSUPM+ 0.3V)
CXP to PGND............................(VSUPM- 0.3V) to (VOUT+ 0.3V)
DRVN to GND.........................................-0.3V to (VSUPN+ 0.3V)
DRVP to GND..........................................-0.3V to (VSUPP+ 0.3V)
RDYto GND...........................................................-0.3V to +14V
SUPP, SUPN to GND..............................................-0.3V to +14V
INTG, REF, FB, FBN, FBP to GND...............-0.3V to (VIN+ 0.3V)
Continuous Current into:
SUPM, CXN, CXP, OUT..............................................±800mA
SUPP, SUPN, DRVN, DRVP........................................±200mASHDN...........................................................................+100µA
All Other Pins....................................................................±10mA
Continuous Power Dissipation (TA= +70°C)
20-Pin TSSOP (derate 10.9mW/°C above +70°C).......879mW
Operating Temperature Range............................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX1747riple Charge-Pump TFT LCD
DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)(VIN= VSUPM= +3.0V, VSUPP= VSUPN= +5V, TGND = PGND = GND, ISHDN= 22µA, COUT= 2 ✕4.7µF, CREF= 0.22µF, CINTG=
MAX1747
Triple Charge-Pump TFT LCD
DC-DC Converter
ELECTRICAL CHARACTERISTICS(VIN= VSUPM= +3.0V, VSUPP= VSUPN= +5V, TGND = PGND = GND, ISHDN= 22µA, COUT= 2 ✕4.7µF, CREF= 0.22µF, CINTG=
1500pF, VOUT= +5V, TA
= -40°C to +85°C,unless otherwise noted.) (Note 1)
MAX1747riple Charge-Pump TFT LCD
DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)(VIN= VSUPM= +3.0V, VSUPP= VSUPM= +5V, TGND = PGND = GND, ISHDN= 22µA, COUT= 2 ✕4.7µF, CREF= 0.22µF, CINTG=
Note 1:Specifications from 0°C to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics(Circuit of Figure 1, VIN= VSUPM= +3.3V, TA= +25°C, unless otherwise noted.)
MAX1747
Triple Charge-Pump TFT LCD
DC-DC Converter
Typical Operating Characteristics (continued)(Circuit of Figure 1, VIN= VSUPM= +3.3V, TA= +25°C, unless otherwise noted.)
MAX1747riple Charge-Pump TFT LCD
DC-DC Converter591113
MAXIMUM POSITIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. SUPPLY VOLTAGEMAX1747 toc13
VSUPP (V)
POS
(V)
LOAD TRANSIENTMAX1747 toc14
40µs/div
200mA
100mA
5.05V
4.95V
VIN = 3.3V, VOUT = 5.0V
ROUT = 500Ω TO 25Ω
CINTG = 1500pF
IOUT
100mA/div
VOUT
50mV/div
RIPPLE WAVEFORMMAX1747 toc15
400ns/div
VOUT = +5.0V,IOUT = 200mA
VNEG = -7V, INEG = 10mA
VPOS = +12V,IPOS = 5mA
VOUT
20mV/div
VNEG
10mV/div
VPOS
10mV/div
STARTUP WAVEFORM (NO LOAD)MAX1747 toc16
1ms/div
VON
2V/div
VCXP
2V/div
VOUT
2V/div
VOUT = 5V, NO LOAD
ON CONNECTED TO SHDN THROUGH
A 58kΩ RESISTOR
STARTUP WAVEFORM (200mA LOAD)MAX1747 toc17
1ms/div
VOUT = 5V, ROUT = 25Ω (200mA)
VON
2V/div
VCXP
2V/div
VOUT
2V/div
ON CONNECTED TO SHDN THROUGH
POWER-UP SEQUENCEMAX1747 toc18
ON CONNECTED TO SHDN THROUGH
A 58kΩ RESISTOR
-10V
10V
2ms/div
VMAIN = 5V, VNEG = -7V, VPOS = 12V
VON
2V/div
VMAIN
5V/div
VPOS
10V/div
VNEG
10V/div
Typical Operating Characteristics (continued)(Circuit of Figure 1, VIN= VSUPM= +3.3V, TA= +25°C, unless otherwise noted.)
