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LTC3865 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3865
Description  Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3865 Datasheet(HTML) 6 Page - Linear Technology

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LTC3865/LTC3865-1

3865f
Load Step
(Burst Mode Operation)
Load Step
(Forced Continuous Mode)
Load Step
(Pulse-Skipping Mode)
Inductor Current at Light Load
Prebiased Output at 1V
Coincident Tracking
VOUT
100mV/DIV
AC-
COUPLED
ILOAD
5A/DIV
500mA
TO 7A
IL
5A/DIV
40µs/DIV
VIN = 12V
VOUT = 1.5V
FIGURE 16 CIRCUIT
3865 G01
VOUT
100mV/DIV
AC-
COUPLED
ILOAD
5A/DIV
500mA
TO 7A
IL
5A/DIV
40µs/DIV
3865 G02
VIN = 12V
VOUT = 1.5V
FIGURE 16 CIRCUIT
VOUT
100mV/DIV
AC-
COUPLED
ILOAD
5A/DIV
500mA
TO 7A
IL
5A/DIV
40µs/DIV
3865 G03
VIN = 12V
VOUT = 1.5V
FIGURE 16 CIRCUIT
RUN
2V/DIV
VTRACK/SS
1V/DIV
VOUT = 1.5V
500mV/DIV
40ms/DIV
3865 G05
FORCED
CONTINUOUS
MODE
5A/DIV
PULSE-
SKIPPING MODE
5A/DIV
Burst Mode
OPERATION
5A/DIV
2µs/DIV
VIN = 12V
VOUT = 1.5V
ILOAD = 100mA
FIGURE 16 CIRCUIT
3865 G04
RUN1
2V/DIV
40ms/DIV
3865 G06
VOUT2 = 1.2V
1 LOAD
500mV/DIV
VOUT1 = 1.5V
1 LOAD
500mV/DIV
Typical perForMance characTerisTics
Efficiency vs Load Current
Efficiency vs Load Current
Efficiency and Power Loss
vs Input Voltage
LOAD CURRENT (A)
30
90
100
20
10
80
50
70
60
40
0.01
1
10
100
3865 G23
0
0.1
VIN = 12V
VOUT = 1.5V
FIGURE 16 CIRCUIT
BURST
DCM
CCM
LOAD CURRENT (A)
30
90
100
20
10
80
50
70
60
40
0.01
1
10
100
3865 G24
0
0.1
VIN = 12V
VOUT = 1.2V
FIGURE 16 CIRCUIT
BURST
DCM
CCM
INPUT VOLTAGE (V)
0
50
60
70
3865 G25
40
30
20
10
20
80
90
100
3
2
1
0
4
5
30
EFFICIENCY
POWER LOSS
FIGURE 16 CIRCUIT


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