MAX1742 查看數據表（PDF） - Maxim Integrated
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MAX1742
Maxim Integrated
MAX1742 Datasheet PDF : 16 Pages
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1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
Typical Operating Characteristics (continued)
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
MAX1842
EFFICIENCY vs. OUTPUT CURRENT
(VIN = 5.0V, L = 2.5μH)
100
95
VOUT = 2.5V, RTOFF = 47kΩ,
fPWM = 1070kHz
90
MAX1842
EFFICIENCY vs. OUTPUT CURRENT
(VIN = 3.3V, L = 1.5μH)
100
95
VOUT = 2.5V, RTOFF = 39kΩ,
fPWM = 610kHz
90
85
85
80
80
75
75
70
VOUT = 1.8V, RTOFF = 75kΩ,
65
fPWM = 910kHz
70
VOUT = 1.8V, RTOFF = 43kΩ,
65
fPWM = 1050kHz
60
VOUT = 1.5V, RTOFF = 1OOkΩ,
55
fPWM = 770kHz
50
0.001 0.01
0.1
1
10
OUTPUT CURRENT (A)
60
VOUT = 2.5V, RTOFF = 56kΩ,
55
fPWM = 1000kHz
50
0.001 0.01
0.1
1
10
OUTPUT CURRENT (A)
MAX1842
EFFICIENCY vs. OUTPUT CURRENT
(fPWM = 270kHz)
100
95
VIN = 5V, VOUT = 1.8V, L = 5.6μH,
RTOFF = 240kΩ
90
MAX1842
NORMALIZED OUTPUT ERROR
vs. OUTPUT CURRENT
0.1
VIN = 3.3V, VOUT = 1.5V, L = 1.5μH
0
85
80
-0.1
75
70
VIN = 3.3V, VOUT = 1.8V,
65
L = 4.7μH, RTOFF = 160kΩ
60
-0.2
VIN = 5V, VOUT = 1.5V, L = 2.5μH
-0.3
55
50
0.001 0.01
0.1
1
10
IOUT (A)
-0.4
0.001 0.01
0.1
1
10
OUTPUT CURRENT (A)
MAX1842
SWITCHING FREQUENCY
vs. OUTPUT CURRENT
1200
VIN = 5V, VOUT = 2.5V, L = 2.5μH
1000
800
MAX1842
STARTUP AND SHUTDOWN
MAX1842 toc16
IINPUT
0 1A/div
600
VIN = 3.3V, VOUT = 1.5V, L = 1.5μH
VSHDN
0 5V/div
400
VIN = 5V, VOUT = 1.5V, L = 2.5μH
VOUTPUT
0 1V/div
200
0
0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT CURRENT (A)
1ms/div
ROUT = 0.5Ω, RTOFF = 56kΩ
VIN = 3.3V, VOUT = 1.5V
VSS
0 2V/div
_______________________________________________________________________________________ 7
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