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MAX1742-MAX1842 Datasheet(PDF) 7 Page - Maxim Integrated Products

Part # MAX1742-MAX1842
Description  1A/2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1742-MAX1842 Datasheet(HTML) 7 Page - Maxim Integrated Products

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


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