MAX1881 查看數據表（PDF） - Maxim Integrated
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MAX1881 Datasheet PDF : 38 Pages
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Quad-Output TFT LCD DC-DC
Converters with Buffer
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = +3.3V, SHDN = IN, VMAIN = VSUPP = VSUPN = VSUPB = VSUPL = 8V, BUF- = BUFOUT,
BUF+ = FLTSET = TGND = PGND = GND, TA = +25°C.)
LINEAR-REGULATOR OUTPUT VOLTAGE
vs. INPUT VOLTAGE
(EXTERNAL LINEAR REGULATOR)
2.55
2.53
2.51
ILDO = 0
2.49
ILDO = 750mA
2.47
FIGURE 7
2.45
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
LINEAR-REGULATOR OUTPUT VOLTAGE
vs. LOAD CURRENT
(EXTERNAL LINEAR REGULATOR)
2.55
FIGURE 7
2.53
2.51
2.49
2.47
250mA
50mA
EXTERNAL LINEAR-REGULATOR
LOAD-TRANSIENT RESPONSE
MAX1778 toc35
A
2.55V
2.50V
B
2.45V
2.45
0.1
1
10
100
1000
ILDO (mA)
100µs/div
A. ILDO = 50mA TO 250mA, 200mA/div
B. VLDO = 2.5V, 50mV/div
FIGURE 7
EXTERNAL LINEAR-REGULATOR
RIPPLE REJECTION
MAX1778 toc36
A
2.5V
8.0V
B
7.8V
1A
0.5A
C
0
10µs/div
A. VLDO = 2.5V, ILDO = 200mA, 10mV/div
B. VMAIN = VSUPL = 8V, 200mV/div
C. IMAIN = 0 TO 750mA, 500mA/div
FIGURE 7
INPUT OFFSET VOLTAGE DEVIATION
vs. COMMON-MODE VOLTAGE
2.5
1.5
VSUPB = 4.5V
0.5
VSUPB = 13V
-0.5
-1.5
-2.5
0 2 4 6 8 10 12 14
VCM (V)
INPUT OFFSET VOLTAGE DEVIATION
vs. BUFFER SUPPLY VOLTAGE
1.0
VCM = VSUPB / 2
0.6
0.2
-0.2
-0.6
-1.0
4
6
8
10
12
14
VSUPB (V)
14 ______________________________________________________________________________________
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