MAX8795AETJ-T 查看數據表（PDF） - Maxim Integrated
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MAX8795AETJ-T Datasheet PDF : 31 Pages
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TFT-LCD DC-DC Converter with
Operational Amplifiers
Typical Operating Characteristics
(Circuit of Figure 1, VIN = 5V, VMAIN = 14V, VGON = 25V, VGOFF = -10V, TA = +25°C, unless otherwise noted.)
STEP-UP EFFICIENCY
vs. LOAD CURRENT
90
85
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
1.4
1.3
STEP-UP SUPPLY CURRENT
vs. SUPPLY VOLTAGE
18
NO LOAD, SUP DISCONNECTED,
15
R1 = 221kΩ, R2 = 21.5kΩ
12
CURRENT INTO INDUCTOR
80
1.2
9
75
70
1
VIN = 5V
VMAIN = 13.9V
10
100
1000
LOAD CURRENT (mA)
STEP-UP REGULATOR SOFT-START
(HEAVY LOAD)
MAX8795A toc04
1.1
1.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
STEP-UP REGULATOR PULSED
LOAD-TRANSIENT RESPONSE
MAX8795A toc05
6
CURRENT INTO IN PIN
3
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
TIMER-DELAYED OVERLOAD PROTECTION
MAX8795A toc06
A
A
0V
50mA
A
B
13.9V
B
0V
C
0A
2ms/div
A: VIN, 5V/div
B: VMAIN, 5V/div
C: INDUCTOR CURRENT, 1A/div
REF VOLTAGE LOAD REGULATION
1.2500
1.2495
1.2490
1.2485
1.2480
1.2475
1.2470
0
10
20
30
40
50
LOAD CURRENT (µA)
C
0A
10µs/div
A: LOAD CURRENT, 1A/div
B: VMAIN, 200mV/div, AC-COUPLED
C: INDUCTOR CURRENT, 1A/div
GATE-ON REGULATOR LINE REGULATION
0
-0.2
-0.4
-0.6
-0.8
25
IPOS = 20mA
26
27
28
29
30
INPUT VOLTAGE (V)
B
0A
0U
40ms/div
A: VMAIN, 2V/div
B: INDUCTOR CURRENT, 1A/div
GATE-ON REGULATOR LOAD REGULATION
-0.1
-0.3
-0.5
0
IBOOST = 200mA
5
10
15
20
LOAD CURRENT (mA)
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