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.)
NEGATIVE CHARGE-PUMP EFFICIENCY
vs. LOAD CURRENT
100
VNEG = -5V
90
VSUPN = 6V
80
VSUPN = 7V
70
60
VSUPN = 8V
50
40
30
0
10
20
30
40
INEG (mA)
MAXIMUM NEGATIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
-2
-4
-6
INEG = 10mA
-8
INEG = 1mA
-10
-12
-14
2 4 6 8 10 12 14
VSUPN (V)
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
1.27
1.26
1.25
1.24
1.23
0
20
40
60
80 100
IREF (µA)
STEP-UP CONVERTER LOAD-TRANSIENT
RESPONSE
MAX1778 toc13
200mA
A
0
8.1V
8.0V
B
7.9V
1A
C
0
STEP-UP CONVERTER LOAD-TRANSIENT
RESPONSE WITHOUT INTEGRATOR
MAX1778 toc14
200mA
A
0
8.1V
8.0V
B
7.9V
1A
C
0
40µs/div
A. IMAIN = 20mA to 200mA, 200mA/div
B. VMAIN = 8V, 100mV/div
C. INDUCTOR CURRENT, 1A/div
CINTG = 1000pF
40µs/div
A. IMAIN = 20mA to 200mA, 200mA/div
B. VMAIN = 8V, 100mV/div
C. INDUCTOR CURRENT, 1A/div
INTG = REF
STEP-UP CONVERTER LOAD-TRANSIENT
RESPONSE (1µs PULSES)
MAX1778 toc15
0.5A
A
0
8.0V
7.9V
B
1A
0.5A
C
0
4µs/div
A. IMAIN = 0 to 500mA, 500mA/div
B. VMAIN = 8V, 100mV/div
C. INDUCTOR CURRENT, 500mA/div
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