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LTC3890IUH Datasheet(PDF) 5 Page - Linear Technology

Part # LTC3890IUH
Description  60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3890IUH Datasheet(HTML) 5 Page - Linear Technology

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LTC3890
5
3890f
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency and Power Loss vs
Output Current
Efficiency vs Output Current
Load Step
Burst Mode Operation
Load Step
Forced Continuous Mode
Load Step
Pulse-Skipping Mode
Inductor Current at Light Load
Soft Start-Up
Tracking Start-Up
Efficiency vs Input Voltage
OUTPUT CURRENT (A)
FIGURE 13 CIRCUIT
0
70
100
1
0.1
0.01
0.001
0.0001
10
3890 G01
50
40
30
20
1
10
100
1000
10000
0.1
10
60
80
90
VIN = 12V
VOUT = 3.3V
BURST EFFICIENCY
CCM LOSS
PULSE-SKIPPING
LOSS
BURST LOSS
CCM EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
OUTPUT CURRENT (A)
0
70
100
1
0.1
0.01
0.001
0.0001
10
3890 G02
50
40
30
20
10
60
80
90
VOUT = 8.5V
VOUT = 3.3V
VIN = 12V
Burst Mode OPERATION
FIGURE 13 CIRCUIT
INPUT VOLTAGE (V)
80
94
100
20
30 35 40 45 50 55 60
15
10
5
025
3890 G03
90
88
86
84
82
92
96
98
VOUT1 = 3.3V
VOUT2 = 8.5V
ILOAD = 2A
FIGURE 13 CIRCUIT
VIN = 12V
VOUT = 3.3V
FIGURE 13 CIRCUIT
50μs/DIV
3890 G04
VOUT
100mV/DIV
AC-
COUPLED
IL
2A/DIV
VIN = 12V
VOUT = 3.3V
FIGURE 13 CIRCUIT
50μs/DIV
3890 G05
VOUT
100mV/DIV
AC-
COUPLED
IL
2A/DIV
VIN = 12V
VOUT = 3.3V
FIGURE 13 CIRCUIT
50μs/DIV
3890 G06
VOUT
100mV/DIV
AC-
COUPLED
IL
2A/DIV
VIN = 12V
VOUT = 3.3V
ILOAD = 200μA
5μs/DIV
3890 G07
FORCED
CONTINUOUS
MODE
PULSE-SKIPPING
MODE
Burst Mode
OPERATION
1A/DIV
FIGURE 13 CIRCUIT
2ms/DIV
3890 G08
VOUT2
2V/DIV
VOUT1
2V/DIV
FIGURE 13 CIRCUIT
2ms/DIV
3890 G09
VOUT2
2V/DIV
VOUT1
2V/DIV


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