MAX1747 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX1747 Datasheet PDF : 13 Pages
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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.)
16
14
12
10
8
6
4
2
0
0
1.15
NO-LOAD SUPPLY CURRENT
vs. SWITCHING FREQUENCY
0.5
1.0
1.5
2.0
FREQUENCY (MHz)
SWITCHING FREQUENCY
vs. TEMPERATURE
1.10
1.05
1.00
0.95
0.90
0.85
-40
VON = 3.3V
RFREQ = 120kΩ
-15
10
35
60
85
TEMPERATURE (°C)
MAXIMUM NEGATIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
-2
VNEG(NOMINAL) = -20V
-6
-10
INEG = 10mA
-14
INEG = 1mA
-18
-22
3
5
7
9
11
13
VSUPN (V)
SWITCHING FREQUENCY
vs. ISHDN
2.0
1.6
1.2
0.8
0.4
0
0
10
20
30
40
50
ISHDN (mA)
NEGATIVE LOW-POWER CHARGE-PUMP
EFFICIENCY vs. LOAD CURRENT
100
VNEG = -7V
90
80
VSUPN = 5V
70
VSUPN = 6V
60
50
40
VSUPN = 7V
30
20
0
10
20
30
40
INEG (mA)
POSITIVE LOW-POWER CHARGE-PUMP
EFFICIENCY vs. LOAD CURRENT
100
90
VSUPP = 5V
80
70
60
50
VSUPP = 6V
VSUPP = 7V
40
30
20
0
VPOS = 12V
10
20
30
40
IPOS (mA)
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
12.0
11.5
11.0
10.5
10.0
9.5
9.0
-40
VON = 3.3V
RFREQ = 120kΩ
-15
10
35
60
85
TEMPERATURE (°C)
NEGATIVE LOW-POWER CHARGE-PUMP
OUTPUT VOLTAGE vs. LOAD CURRENT
-6.3
-6.4
-6.5
VSUPN = 5V
-6.6
-6.7
VSUPN = 6V
-6.8
-6.9
-7.0
VSUPN = 7V
-7.1
0
10
20
30
40
INEG (mA)
POSITIVE LOW-POWER CHARGE-PUMP
OUTPUT VOLTAGE vs. LOAD CURRENT
12.2
12.1
12.0
VSUPP = 7V
11.9
11.8
11.7
VSUPP = 6V
11.6
VSUPP = 5V
11.5
11.4
0
10
20
30
40
IPOS (mA)
6 _______________________________________________________________________________________
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