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.)
POWER-UP SEQUENCE FROM
SLOW-RISING INPUT SUPPLY
5V MAX1889 toc10
A
0
B
5V
0
20V
C
10V
0
0
D
-10V
2ms/div
A: VIN, 5V/div
B: VMAIN = 9V, 5V/div
C: VPL = 20V, 10V/div
D: VNL = -7V, 10V/div
STEP-UP REGULATOR SOFT-START
(10mA LOAD) USING SHDN CONTROL
5V MAX1889 toc11
A
0
5V
B
0
5V
C
0
10V
5V
D
0
1ms/div
A: VSHDN, 5V/div
B: VGATE, 5V/div
C: VC2, 5V/div
D: VMAIN = 9V, 5V/div
STEP-UP REGULATOR SOFT-START
(200mA LOAD) USING SHDN CONTROL
5V MAX1889 toc12
A
0
5V
B
0
5V
C
0
10V
5V
D
0
1ms/div
A: VSHDN, 5V/div
B: VGATE, 5V/div
C: VC2, 5V/div
D: VMAIN = 9V, 5V/div
POWER-UP SEQUENCE
USING SHDN CONTROL
5V MAX1889 toc13
A
0
5V
B
0
20V
C
10V
0
0
D
-10V
2ms/div
A: VSHDN, 5V/div
B: VMAIN = 9V, 5V/div
C: VPL = 20V, 10V/div
D: VNL = -7V, 10V/div
STEP-UP REGULATOR NORMAL OPERATION
(200mA LOAD)
MAX1889 toc14
A
B
C
1µs/div
A: VLX, 5V/div
B: VMAIN = 9V, 50mV/div, AC-COUPLED
C: INDUCTOR CURRENT, 500mA/div
10V
5V
0
9.05V
9V
1A
500mA
0
POSITIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. LOAD CURRENT
26.2
26.0
25.8
25.6
25.4
25.2
VIN = 3.3V
IMAIN = 200mA
25.0
0.1
1
10
LOAD CURRENT (mA)
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