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MAX1748EUE+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
MAX1748/MAX8726
Triple-Output TFT-LCD
DC-DC Converters
4 _______________________________________________________________________________________
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
Input Supply Range V
IN
2.7 5.5 V
Input Undervoltage Threshold
V
UVLO
V
IN
rising, 40mV hysteresis (typ) 2.2 2.6 V
IN Quiescent Supply Current I
IN
V
FB
= V
FBP
= 1.5V, V
FBN
= -0.2V 1 mA
SUPP Quiescent Current
I
SUPP
V
FBP
= 1.5V 0.8 mA
SUPN Quiescent Current
I
SUPN
V
FBN
= -0.1V 0.8 mA
IN Shutdown Current V
SHDN
= 0, V
IN
= 5V 10 µA
SUPP Shutdown Current V
SHDN
= 0, V
SUPP
= 13V 10 µA
SUPN Shutdown Current V
SHDN
= 0, V
SUPN
= 13V 10 µA
MAIN BOOST CONVERTER
Output Voltage Range
V
MAIN
V
IN
13.0
V
FB Regulation Voltage V
FB
1.222 1.271
V
FB Input Bias Current I
FB
V
FB
= 1.25V, INTG = GND -50
+50
nA
Operating Frequency F
OSC
0.75 1.25
MHz
Oscillator Maximum Duty Cycle
78 90 %
LX Switch On-Resistance
R
LX
(
ON
)
I
LX
= 100mA 0.7 Ω
LX Leakage Current
I
LX
V
LX
= 13V 20 µA
Phase I = soft-start (1.0ms)
0.275 0.500
LX Current Limit
I
LX
(
MAX
)
Phase IV = fully on (after 3.0ms) 1.1 2.0
A
FB Fault Trip Level
1.07 1.14
V
POSITIVE CHARGE PUMP
SUPP Input Supply Range
V
SUPP
2.7
13.0
V
FBP Regulation Voltage V
FBP
1.20 1.30
V
FBP Input Bias Current I
FBP
V
FBP
= 1.5V -50
+50
nA
DRVP PCH On-Resistance 10 Ω
V
FBP
= 1.213V 4 Ω
DRVP NCH On-Resistance
V
FBP
= 1.275V 20 kΩ
FBP Power-Ready Trip Level Rising edge
1.091 1.159
V
NEGATIVE CHARGE PUMP
SUPN Input Supply Range
V
SUPN
2.7
13.0
V
FBN Regulation Voltage V
FBN
-50
+50
mV
FBN Input Bias Current
I
FBN
V
FBN
= -0.05V -50
+50
nA
DRVN PCH On-Resistance
10 Ω
V
FBN
= 0.035V 4 Ω
DRVN NCH On-Resistance
V
FBN
= -0.025V 20 kΩ
FBN Power-Ready Trip Level Rising edge 80
165
mV
REFERENCE
Reference Voltage V
REF
-2µA < I
REF
< +50µA
1.223 1.269
V
Reference Undervoltage
V
REF
rising 0.9 1.2 V
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +3.0V, SHDN = IN, V
SUPP
= V
SUPN
= 10V, TGND = PGND = GND, C
REF
= 0.22µF, C
INTG
= 470pF, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
MAX1748/MAX8726
Triple-Output TFT-LCD
DC-DC Converters
_______________________________________________________________________________________ 5
9.84
9.90
9.88
9.86
9.92
9.94
9.96
9.98
10.00
10.02
10.04
0 200100 300 400 500 600
MAIN OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX1748/8726 toc01
I
MAIN
(mA)
V
MAIN
(V)
V
IN
= 3.3V
V
IN
= 5.0V
60
65
70
75
80
85
90
95
100
0 200100 300 400 500 600
MAIN STEP-UP CONVERTER
EFFICIENCY vs. LOAD CURRENT
(BOOST ONLY)
MAX1748/8726 toc02
I
MAIN
(mA)
EFFICIENCY (%)
V
IN
= 3.3V
V
MAIN
= 10V
V
IN
= 5.0V
60
65
70
75
80
85
90
95
100
0 200100 300 400 500 800600 700
MAIN STEP-UP CONVERTER
EFFICIENCY vs. LOAD CURRENT
(BOOST ONLY)
MAX1748/8726 toc03
I
MAIN
(mA)
EFFICIENCY (%)
V
IN
= 3.3V
V
MAIN
= 8V
V
IN
= 5.0V
50
55
60
65
70
75
80
85
90
0 10050 150 200 250 400300 350
EFFICIENCY vs. LOAD CURRENT
(BOOST CONVERTER AND CHARGE PUMPS)
MAX1748/8726 toc04
I
MAIN
(mA)
EFFICIENCY (%)
V
MAIN
= 8V
V
IN
= 3.3V
V
NEG
= -5V WITH I
NEG
= 10mA
V
POS
= 15V WITH I
POS
= 5mA
V
MAIN
= 10V
-5.05
-4.95
-5.00
-4.80
-4.85
-4.90
-4.65
-4.70
-4.75
-4.60
015205 10 25303540
NEGATIVE CHARGE-PUMP OUTPUT
VOLTAGE vs. LOAD CURRENT
MAX1748/8726 toc05
I
NEG
(mA)
V
NEG
(V)
V
SUPN
= 6V
V
NEG
= -5V
V
SUPN
= 8V
V
SUPN
= 10V
20
30
50
40
70
60
80
015205 10 25303540
NEGATIVE CHARGE-PUMP EFFICIENCY
vs. LOAD CURRENT
MAX1748/8726 toc06
I
NEG
(mA)
EFFICIENCY (%)
V
SUPN
= 6V
V
NEG
= -5V
V
SUPN
= 8V
V
SUPN
= 10V
Typical Operating Characteristics
(Circuit of Figure 5, V
IN
= 3.3V, T
A
= +25°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +3.0V, SHDN = IN, V
SUPP
= V
SUPN
= 10V, TGND = PGND = GND, C
REF
= 0.22µF, C
INTG
= 470pF, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
LOGIC SIGNALS
SHDN Input Low Voltage 0.45V hysteresis (typ) 0.9 V
SHDN Input High Voltage 2.1 V
SHDN
Input Current
I
SHDN
1µA
RDY Output Low Voltage I
SINK
= 2mA 0.5 V
RDY Output High Leakage V
RDY
= 13V 1 µA
Note 1: Specifications from 0°C to -40°C are guaranteed by design, not production tested.
MAX1748/MAX8726
Triple-Output TFT-LCD
DC-DC Converters
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuit of Figure 5, V
IN
= 3.3V, T
A
= +25°C, unless otherwise noted.)
8
10
18
20
12
16
14
22
24
58796101112
MAXIMUM POSITIVE CHARGE-PUMP OUTPUT
VOLTAGE vs. SUPPLY VOLTAGE
MAX1748/8726 toc10
V
SUPP
(V)
V
POS
(V)
I
POS
= 10mA
V
POS
= 22V
I
POS
= 1mA
I
POS
= 20mA
0.80
0.85
0.90
1.05
1.00
0.95
1.10
1.15
1.20
2.5 3.53.0 4.0 4.5 5.0 5.5
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX1748/8726 toc11
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (MHz)
MEASURED FROM THE
FALLING EDGE OF LX
V
MAIN
= 10V
I
MAIN
= 100mA
1.244
1.246
1.250
1.248
1.252
1.254
0201510 3025535404550
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
MAX1748/8726 toc12
I
REF
(
μ
A)
V
REF
(V)
V
IN
= 3.3V
V
MAIN
10mV/div
V
NEG
10mV/div
V
POS
10mV/div
RIPPLE WAVEFORMS
MAX1748/8726 toc13
1μs/div
V
MAIN
= 10V, I
MAIN
= 200mA,
V
NEG
= -5V, I
NEG
= 10mA,
V
POS
= 15V, I
POS
= 10mA
I
MAIN
200mA/div
I
LX
500mA/div
V
MAIN
200mV/div
LOAD-TRANSIENT RESPONSE
MAX1748/8726 toc14
100μs/div
V
IN
= 3.3V, V
MAIN
= 10V,
R
MAIN
= 500Ω TO 50Ω (20mA TO 200mA)
I
MAIN
200mA/div
I
LX
500mA/div
V
MAIN
200mV/div
LOAD-TRANSIENT RESPONSE
WITHOUT INTEGRATOR
MAX1748/8726 toc15
100μs/div
V
IN
= 3.3V, V
MAIN
= 10V, INTG = REF,
R
MAIN
= 500Ω TO 50Ω (20mA TO 200mA)
-11
-9
-10
-7
-8
-4
-5
-6
-3
5867 9101112
MAXIMUM NEGATIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX1748/8726 toc07
V
SUPN
(V)
V
NEG
(V)
I
NEG
= 20mA
I
NEG
= 1mA
I
NEG
= 10mA
V
NEG
= -10mA
14.4
14.5
14.6
14.9
15.0
14.7
14.8
15.2
15.1
15.3
086102 4 12 14 16 18 20
POSITIVE CHARGE-PUMP OUTPUT
VOLTAGE vs. LOAD CURRENT
MAX1748/8726 toc08
I
POS
(mA)
V
POS
(V)
V
SUPN
= 12V
V
SUPN
= 8V
V
SUPN
= 10V
40
50
80
60
70
90
100
086102 4 12 14 16 18 20
POSITIVE CHARGE-PUMP EFFICIENCY
vs. LOAD CURRENT
MAX1748/8726 toc09
I
POS
(mA)
EFFICIENCY (%)
V
SUPP
= 12V
V
SUPP
= 8V
V
SUPP
= 10V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX1748EUE+

Mfr. #:
Buy MAX1748EUE+
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators Triple-Output TFT LCD DC/DC Converters
Lifecycle:
New from this manufacturer.
Delivery:
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