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LTC3859 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3859
Description  Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller
PDF  40 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3859 Datasheet(HTML) 6 Page - Linear Technology

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LTC3859
6
3859f
TYPICAL PERFORMANCE CHARACTERISTICS
Load Step (Buck)
Burst Mode Operation
Load Step (Buck)
Forced Continuous Mode
Load Step (Buck)
Pulse-Skipping Mode
Inductor Current at Light Load
(Buck)
Soft Start-Up
Buck Regulated Feedback Voltage
vs Temperature
Efficiency and Power Loss
vs Output Current (Buck)
Efficiency
vs Output Current (Buck)
Efficiency vs Input Voltage (Buck)
OUTPUT CURRENT (A)
0.0001
100
90
70
50
30
10
80
60
40
20
0
10000
100
1
1000
10
0.1
110
0.01
3859 G01
0.1
0.001
FIGURE 12 CIRCUIT
VIN = 10V, VOUT = 5V
CCM EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
BURST LOSS
BURST EFFICIENCY
CCM LOSS
PULSE-SKIPPING
LOSS
OUTPUT CURRENT (A)
0.0001
100
90
70
50
30
10
80
60
40
20
0
110
0.01
3859 G02
0.1
0.001
VIN = 10V
VIN = 20V
FIGURE 12 CIRCUIT
INPUT VOLTAGE (V)
0
100
99
97
95
93
98
96
94
92
20
25
30
35
40
10
3859 G03
15
5
FIGURE 12 CIRCUIT
VOUT = 5V
ILOAD = 4A
50μs/DIV
VOUT
100mV/DIV
AC-COUPLED
IL
2A//DIV
VIN = 12V
VOUT = 5V
FIGURE 12 CIRCUIT
3859 G04
50μs/DIV
VOUT
100mV/DIV
AC-COUPLED
IL
2A//DIV
VIN = 12V
VOUT = 5V
FIGURE 12 CIRCUIT
3859 G05
50μs/DIV
VOUT
100mV/DIV
AC-COUPLED
IL
2A//DIV
VIN = 12V
VOUT = 5V
FIGURE 12 CIRCUIT
3859 G06
2μs/DIV
FORCED
CONTINUOUS
MODE
Burst Mode
OPERATION
1A/DIV
PULSE-
SKIPPING
MODE
VIN = 10V
VOUT = 5V
ILOAD = 1mA
FIGURE 12 CIRCUIT
3859 G07
2ms/DIV
VOUT2
2V/DIV
VOUT1
2V/DIV
3859 G08
FIGURE 12 CIRCUIT
TEMPERATURE (°C)
–45
808
806
802
798
794
804
800
796
792
30
55
80
105
130
–20
3859 G09
5



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