MAX1623(1999) データシートの表示（PDF） - Maxim Integrated
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MAX1623
(Rev.:1999)
(Rev.:1999)
Maxim Integrated
MAX1623 Datasheet PDF : 12 Pages
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3A, Low-Voltage, Step-Down Regulator with
Synchronous Rectification and Internal Switches
__________________________________________Typical Operating Characteristics
(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
100
90
80
70
60
50
40
30
20
10
0
0.001
EFFICIENCY
vs. OUTPUT CURRENT
VOUT = 3.3V, RTOFF = 110kΩ
VOUT = 2.5V, RTOFF = 180kΩ
VOUT = 1.1V, RTOFF = 280kΩ
0.01
0.1
1
10
OUTPUT CURRENT (A)
SWITCH OFF-TIME vs.
OFF-TIME RESISTANCE
5
SUPPLY CURRENT
vs. INPUT VOLTAGE
1000
4
100
SHDN = IN
3
10
2
1
SHDN = GND
1
0.1
0
0
100 200 300 400 500 600
RTOFF (kΩ)
0.01
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
SWITCHING FREQUENCY
vs. LOAD CURRENT
350
VOUT = 1.1V, RTOFF = 280kΩ
300
250
VOUT = 2.5V, RTOFF = 180kΩ
200
VOUT = 3.3V, RTOFF = 110kΩ
150
100
50
0
0 500 1000 1500 2000 2500 3000
LOAD CURRENT (mA)
REFERENCE LOAD REGULATION ERROR
vs. REFERENCE LOAD CURRENT
0
-0.01
-0.02
TA = +25°C
-0.03
TA = -40°C
-0.04
TA = +85°C
-0.05
-0.06
0
5
10
15
20
25
REFERENCE LOAD CURRENT (µA)
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
400
VIN = 5V, VOUT = 2.5V,
350
RTOFF = 180kΩ
300
250
200
VIN = 5V, VOUT = 3.3V,
RTOFF = 110kΩ
150
100
50
0
4.5 4.7 4.9 5.1 5.3 5.5
INPUT VOLTAGE (V)
LOAD REGULATION ERROR
vs. LOAD CURRENT
0
-0.05
-0.10
-0.15
-0.20
-0.25 VOUT = 3.3V, RTOFF = 110kΩ
-0.30
-0.35
VOUT = 2.5V, RTOFF = 180kΩ
-0.40
-0.45
-0.50
0.001
0.01
0.1
1
10
LOAD CURRENT (A)
4 _______________________________________________________________________________________
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