MAX1742 Просмотр технического описания (PDF) - Maxim Integrated
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производитель
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
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
MAX1742
EFFICIENCY vs. OUTPUT CURRENT
(VIN = 5.0V, L = 6.0μH)
100
95
VOUT = 2.5V, RTOFF = 47kΩ, f = 926kHz
90 VOUT = 1.8V, RTOFF = 75kΩ,
85 f = 833kHz
80
75
70
65
60
55
50
0.001
VOUT = 1.5V, RTOFF = 100kΩ, f = 692kHz
0.01
0.1
1
OUTPUT CURRENT (A)
MAX1742
EFFICIENCY vs. OUTPUT CURRENT
(VIN = 3.3V, L = 3.9μH)
100
95 VOUT = 2.5V, RTOFF = 36kΩ, f = 456kHz
90
85
80
75
70
VOUT = 1.8V, RTOFF = 43kΩ, f = 869kHz
65
60
55
VOUT = 1.5V, RTOFF = 56kΩ, f = 833kHz
50
0.001
0.01
0.1
1
OUTPUT CURRENT (A)
MAX1742
EFFICIENCY vs.OUTPUT CURRENT
(fPWM = 270kHz)
100
95
VIN = 5V, VOUT = 1.8V,
L = 15μH, RTOFF = 240kΩ
90
85
80
75
70
65
60
VIN = 3.3V, VOUT = 1.8V,
L = 10μH, RTOFF = 160kΩ
55
50
0.001
0.01
0.1
1
OUTPUT CURRENT (A)
MAX1742
NORMALIZED OUTPUT ERROR
vs. OUTPUT CURRENT
0.5
0.4
0.3
0.2 VIN = 5V, VOUT = 1.5V, L = 6μH
0.1
0
-0.1
-0.2
VIN = 3.3V, VOUT = 1.5V
-0.3
-0.4
-0.5
0.001
0.01
0.1
1
OUTPUT CURRENT (A)
MAX1742
SWITCHING FREQUENCY
vs. OUTPUT CURRENT
1100
1000
VIN = 5V, VOUT = 2.5V, L = 6μH
900
800
700
600
500
400
VIN = 5V, VOUT = 1.5V, L = 6μH
300
200
VIN = 3.3V, VOUT = 1.5V, L = 3.9μH
100
0
0
0.2 0.4 0.6 0.8 1.0
OUTPUT CURRENT (A)
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