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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1747 Datasheet

Triple Charge-Pump TFT LCD DC-DC Converter

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MAX1747 pdf
19-1788; Rev 0; 10/00
EVAALVUAAILTAIOBNLEKIT
Triple Charge-Pump TFT LCD
DC-DC Converter
General Description
The 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).
Applications
TFT Active-Matrix LCDs
Passive-Matrix Displays
Personal Digital Assistants (PDAs)
TOP VIEW
TGND 1
TGND 2
RDY 3
FB 4
INTG 5
IN 6
GND 7
REF 8
FBP 9
FBN 10
Pin Configuration
MAX1747
20 OUT
19 CXP
18 SUPM
17 CXN
16 PGND
15 SUPP
14 DRVP
13 SUPN
12 DRVN
11 SHDN
Features
o Adjustable Outputs
Up to +5.5V Main High-Power Output
Up to +35V Positive Charge-Pump Output
Down to -35V Negative Charge-Pump Output
o 200kHz to 2MHz Adjustable Switching Frequency
o +2.7V to +4.5V Input Supply
o Internal Power MOSFETs
o 0.1µA Shutdown Current
o Internal Soft-Start
o Power-Ready Output
o Internal Supply Sequencing
o Fast Transient Response
o Ultra-Thin Solution (No Inductors)
o Thin TSSOP Package (1.1mm max)
Ordering Information
PART
MAX1747EUP
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
20 TSSOP
Typical Operating Circuit
INPUT
TO µC
SUPM
IN
SHDN
RDY
DRVN
CXP
CXN
OUT
SUPP
SUPN
FB
MAX1747
MAIN OUTPUT
NEGATIVE
OUTPUT
DRVP
FBN
REF
TGND
GND
FBP
INTG
PGND
POSITIVE
OUTPUT
TSSOP
________________________________________________________________ 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

MAX1747 Datasheet

Triple Charge-Pump TFT LCD DC-DC Converter

No Preview Available !

MAX1747 pdf
Triple Charge-Pump TFT LCD
DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
IN, SUPM, OUT, TGND to GND................................-0.3V to +6V
SHDN........................................................................-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)
RDY to 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........................................±200mA
SHDN ...........................................................................+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
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 = VSUPM = +3.0V, VSUPP = VSUPN = +5V, TGND = PGND = GND, I SHDN = 22µA, COUT = 2 4.7µF, CREF = 0.22µF, CINTG =
1500pF, VOUT = +5V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Input Supply Range
Input Undervoltage Threshold
Input Quiescent Supply
Current
SYMBOL
VIN
VUVLO
IIN +
ISUPM
CONDITIONS
VIN falling, 40mV hysteresis (typ)
VFB = VFBP = 1.5V, VFBN = -0.2V, VOUT = 5V,
no load on DRVN and DRVP; CXN
and CXP open
MIN
2.7
2.2
TYP
2.4
0.9
MAX
4.5
2.6
UNITS
V
V
1.0 mA
Output Quiescent Supply
Current
IQ(OUT)
Shutdown Supply Current
Operating Frequency
MAIN CHARGE PUMP
Output Voltage Range
Maximum Output Current
FB Regulation Voltage
FB Input Bias Current
Integrator Transconductance
FB Power-Ready Trip Level
FB Fault Trip Level
fOSC
VOUT
IOUT(MAX)
VFB
IFB
Main Soft-Start Period
NEGATIVE LOW-POWER CHARGE PUMP
SUPN Input Supply Range
VSUPN
SUPN Quiescent Current
ISUPN
SUPN Shutdown Current
FBN Regulation Voltage
VFBN
VFB = VFBP = 1.5V, VFBN = -0.2V, VOUT = 5V,
no load on DRVN and DRVP; CXN and
CXP open
V SHDN = 0, VSUPM = 5V
I SHDN = 22µA
CX = 0.47µF
VFB = 1.25V
Rising edge
Falling edge
VFBN = -0.2V, no load on DRVN
V SHDN = 0, VSUPN = 13V
0.65
4.5
200
1.237
-50
1.09
2.7
-50
2.5
0.1
1
1.248
530
1.125
1.100
4.096
/ FOSC
0.6
0.1
0
4.0
20
1.2
5.5
1.263
+50
1.16
13
0.8
10
+50
mA
µA
MHz
V
mA
V
nA
µS
V
V
s
V
mA
µA
mV
2 _______________________________________________________________________________________


Part Number MAX1747
Description Triple Charge-Pump TFT LCD DC-DC Converter
Maker Maxim
Total Page 13 Pages
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