MAX1945S データシートの表示（PDF） - Maxim Integrated
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MAX1945S Datasheet PDF : 19 Pages
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1MHz, 1% Accurate, 6A Internal Switch
Step-Down Regulators
Typical Operating Characteristics
(VIN = VCC = 5V, VOUT = 1.8V, IOUT = 6A, fSW = 500kHz, VDD = VCC, and TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
VIN = VCC = 5V
100
90
80
70
B
C
60
A
D
E
50
40
30 A: VOUT = 0.8V
20
B: VOUT = 1.5V
C: VOUT = 1.8V
10 D: VOUT = 2.5V
E: VOUT = 3.3V
0
012
34
IOUT (A)
VIN = VCC = 5V
fSW = 500kHz
567
REFERENCE VOLTAGE
vs. REFERENCE SOURCE CURRENT
2.030
2.025
2.020
2.015
2.010
2.005
2.000
fSW = 500kHz
0 4 8 12 16 20 24 28 32 36 40
IREF (µA)
OUTPUT LOAD REGULATION
3.0
fSW = 500kHz
2.5
2.5V
2.0
1.8V
1.5
1.0
0.8V
0.5
0
0
1
2
3
4
5
6
IOUT (A)
EFFICIENCY vs. OUTPUT CURRENT
VIN = VCC = 3.3V
100
90
80
B
70
60
A
C
D
50
40
30
A: VOUT = 0.8V
20 B: VOUT = 1.5V
10
C: VOUT = 1.8V
D: VOUT = 2.5V
0
012
VIN = VCC = 3.3V
fSW = 500kHz
34567
IOUT (A)
EFFICIENCY vs. OUTPUT CURRENT
VIN = 2.5V, VCC = 5V
100
90
80
70
A
60
B
C
50
40
30
20 A: VOUT = 0.8V
10
B: VOUT = 1.5V
C: VOUT = 1.8V
0
012
VIN = 2.5V, VCC = 5V
fSW = 500kHz
34567
IOUT (A)
FREQUENCY vs. INPUT VOLTAGE (500kHz)
550
540
530
+85°C
520
+25°C
510
500
-40°C
490
480
470
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE
14
12
10
8
6
4
2
fSW = 500kHz
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
FREQUENCY vs. INPUT VOLTAGE (1MHz)
1.050
1.025
1.000
0.975
+85°C
+25°C
0.950
0.925
-40°C
0.900
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
CURRENT LIMIT
vs. OUTPUT VOLTAGE
14
13
12
11
10
9
8
7
fSW = 500kHz
6
0.8 1.3 1.8 2.3 2.8 3.3
VOUT (V)
8 _______________________________________________________________________________________
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