MAX1748-MAX8726 데이터 시트보기 (PDF) - Maxim Integrated
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MAX1748-MAX8726 Datasheet PDF : 16 Pages
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Triple-Output TFT-LCD
DC-DC Converters
Typical Operating Characteristics (continued)
(Circuit of Figure 5, VIN = 3.3V, TA = +25°C, unless otherwise noted.)
MAXIMUM NEGATIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
-3
-4
-5
-6
INEG = 20mA
-7
-8 INEG = 1mA
-9
-10
-11
5
INEG = 10mA
VNEG = -10mA
6 7 8 9 10 11 12
VSUPN (V)
MAXIMUM POSITIVE CHARGE-PUMP OUTPUT
VOLTAGE vs. SUPPLY VOLTAGE
24 VPOS = 22V
22
20
IPOS = 10mA
18
IPOS = 1mA
16
14
12
IPOS = 20mA
10
8
5 6 7 8 9 10 11 12
VSUPP (V)
RIPPLE WAVEFORMS
MAX1748/8726 toc13
POSITIVE CHARGE-PUMP OUTPUT
VOLTAGE vs. LOAD CURRENT
15.3
15.2
15.1
15.0
VSUPN = 12V
14.9
VSUPN = 10V
14.8
VSUPN = 8V
14.7
14.6
14.5
14.4
0 2 4 6 8 10 12 14 16 18 20
IPOS (mA)
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
1.20
MEASURED FROM THE
1.15 FALLING EDGE OF LX
VMAIN = 10V
1.10 IMAIN = 100mA
1.05
1.00
0.95
0.90
0.85
0.80
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
LOAD-TRANSIENT RESPONSE
MAX1748/8726 toc14
POSITIVE CHARGE-PUMP EFFICIENCY
vs. LOAD CURRENT
100
VSUPP = 8V
90
80
VSUPP = 10V
70
VSUPP = 12V
60
50
40
0 2 4 6 8 10 12 14 16 18 20
IPOS (mA)
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
1.254
VIN = 3.3V
1.252
1.250
1.248
1.246
1.244
0
5 10 15 20 25 30 35 40 45 50
IREF (μA)
LOAD-TRANSIENT RESPONSE
WITHOUT INTEGRATOR
MAX1748/8726 toc15
VMAIN
10mV/div
VNEG
10mV/div
VPOS
10mV/div
IMAIN
200mA/div
ILX
500mA/div
VMAIN
200mV/div
IMAIN
200mA/div
ILX
500mA/div
VMAIN
200mV/div
1μs/div
100μs/div
100μs/div
VMAIN = 10V, IMAIN = 200mA,
VNEG = -5V, INEG = 10mA,
VPOS = 15V, IPOS = 10mA
VIN = 3.3V, VMAIN = 10V,
RMAIN = 500Ω TO 50Ω (20mA TO 200mA)
VIN = 3.3V, VMAIN = 10V, INTG = REF,
RMAIN = 500Ω TO 50Ω (20mA TO 200mA)
6 _______________________________________________________________________________________
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