MAX1809 데이터 시트보기 (PDF) - Maxim Integrated
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MAX1809 Datasheet PDF : 17 Pages
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3A, 1MHz, DDR Memory Termination Supply
Typical Operating Characteristics
(Circuit of Figure 1, VOUT = 1.25V, for VIN = 5V: L = 1µH, RTOFF = 130kΩ; for VIN = 3.3V: L = 0.68µH, RTOFF = 73.2kΩ.)
EFFICIENCY vs. OUTPUT CURRENT
(SOURCING)
100
95
RDROOP = 0Ω
90
85
80
VIN = 5V,
75
VOUT = 2.5V
70
VIN = 3.3V,
65
VOUT = 1.25V
60
VIN = 5V,
55
VOUT = 1.25V
50
0
1
2
3
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
(SINKING)
95
VIN = 5V,
RDROOP = 0Ω
90
VOUT = 2.5V
85
80
75
70
VIN = 5V,
VOUT = 1.25V
65
60
VIN = 3.3V,
VOUT = 1.25V
55
50
0
1
2
3
OUTPUT CURRENT (A)
NORMALIZED OUTPUT ERROR
vs. OUTPUT CURRENT
-0.2
VIN = 3.3V
-0.6
-1.0
-1.4
VIN = 5V
-1.8
-2.2
-2.6
-3.0
-3 -2 -1 0 1 2 3
OUTPUT CURRENT (A)
NO-LOAD
SUPPLY CURRENT vs. SUPPLY VOLTAGE
24
20
16
12
8
4
0
0123456
VIN (V)
OFF-TIME vs. RTOFF
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0 50 100 150 200 250 300 350 400 450 500
RTOFF (kΩ)
SWITCHING FREQUENCY
vs. OUTPUT CURRENT
1200
VIN = 3.3V
1000
800
600
400
VIN = 5V
200
0
-3 -2 -1
0
1
2
3
OUTPUT CURRENT (A)
STARTUP AND SHUTDOWN
IIN
1A/div
0A
VSHDN
0V
5V/div
VOUT
1V/div
0V
VSS
0V
2V/div
LOAD-TRANSIENT RESPONSE
RDROOP = 0Ω
VOUT
(AC-COUPLED)
50mV/div
0V
V(LX)
5V/div
0A
IOUT
5A/div
1ms/div
VIN = 3.3V, ROUT = 0.5Ω
10µs/div
VEXTREF = 1.25V, VIN = 3.3V, IOUT = -2A to +2A to -2A
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