MAX1889 データシートの表示（PDF） - Maxim Integrated
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MAX1889 Datasheet PDF : 32 Pages
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Triple-Output TFT LCD Power Supply
with Fault Protection
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = +3.3V, VMAIN = +9V, VPL = +20V, VNL = -7V, SHDN = FREQ = IN, PGND = GND, TA = +25°C, unless
otherwise noted.)
POSITIVE CHARGE-PUMP INCREMENTAL
EFFICIENCY vs. LOAD CURRENT
100
95
90
85
80
75
70
65
60
55
EFF = (VOUT ✕ IOUT) /
(PIN(LOAD) - PIN(NOLOAD))
50
0.1
1
10
LOAD CURRENT (mA)
NEGATIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. LOAD CURRENT
-8.2
-8.3
-8.4
-8.5
-8.6
-8.7
0.1
VIN = 3.3V
IMAIN = 200mA
1
10
LOAD CURRENT (mA)
NEGATIVE CHARGE-PUMP INCREMENTAL
EFFICIENCY vs. LOAD CURRENT
100
95
90
85
80
75
70
65
60
EFF = (VOUT ✕ IOUT) /
55 (PIN(LOAD) - PIN(NOLOAD))
50
0.1
1
10
LOAD CURRENT (mA)
POSITIVE LINEAR-REGULATOR
LOAD REGULATION
0
-0.03
-0.06
-0.09
-0.12
-0.15
0.1
1
10
LOAD CURRENT (mA)
POSITIVE LINEAR-REGULATOR
LOAD-TRANSIENT RESPONSE
MAX1889 toc20
NEGATIVE LINEAR-REGULATOR
LOAD REGULATION
0
-0.08
A
20V
-0.16
19.95V
-0.24
B
10mA
-0.32
0
2ms/div
A: VPL = 20V, 50mV/div, AC-COUPLED
B: IPL = 0 TO 10mA, 10mA/div
-0.40
0.1
1
10
LOAD CURRENT (mA)
8 _______________________________________________________________________________________
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