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.)
STEP-UP REGULATOR OUTPUT VOLTAGE
vs. LOAD CURRENT (VMAIN = 13V)
13.1
13.0
12.9
VIN = 2.7V
12.8
VIN = 3.3V
12.7
VIN = 5.5V
12.6
12.5
1
10
100
1000
LOAD CURRENT (mA)
STEP-UP REGULATOR SWITCHING
FREQUENCY vs. INPUT VOLTAGE
1100
1000
900
800
VIN = 3.3V
700
VMAIN = 9V
IMAIN = 200mA
600
500
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
STEP-UP REGULATOR LOAD-TRANSIENT
RESPONSE (0 TO 200mA)
MAX1889 toc06
1A
A
500mA
0
B
C
10µs/div
A: INDUCTOR CURRENT, 500mA/div
B: VMAIN = 9V, 100mV/div, AC-COUPLED
C: IMAIN = 0 TO 200mA, 200mA/div
9V
8.9V
200mA
0
STEP-UP REGULATOR LOAD-TRANSIENT
RESPONSE (0 TO 1A, 2µs PULSE)
2A MAX1889 toc07
1A
A
0
9V
B
8.9V
8.8V
1A
C
0
10µs/div
A: INDUCTOR CURRENT, 1A/div
B: VMAIN = 9V, 100mV/div, AC-COUPLED
C: IMAIN = 0 TO 1A, 1A/div
STEP-UP REGULATOR SOFT-START
(10mA LOAD) FROM
SLOW-RISING INPUT SUPPLY
5V MAX1889 toc08
A
0
5V
B
0
5V
C
0
10V
5V
D
0
1ms/div
A: VIN, 5V/div
B: VGATE, 5V/div
C: VC2, 5V/div
D: VMAIN = 9V, 5V/div
STEP-UP REGULATOR SOFT-START
(200mA LOAD) FROM
SLOW-RISING INPUT SUPPLY
5V MAX1889 toc09
A
0
5V
B
0
5V
C
0
10V
5V
D
0
1ms/div
A: VIN, 5V/div
B: VGATE, 5V/div
C: VC2, 5V/div
D: VMAIN = 9V, 5V/div
6 _______________________________________________________________________________________
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