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| LTC3865-1_15 Datasheet, PDF (6/38 Pages) Linear Technology – Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs | |||
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LTC3865/LTC3865-1
TYPICAL PERFORMANCE CHARACTERISTICS
Efï¬ciency vs Load Current
100
90
80
70
BURST
60
DCM CCM
50
40
30
20
10
0
0.01
VIN = 12V
VOUT = 1.5V
FIGURE 16 CIRCUIT
0.1
1
10
100
LOAD CURRENT (A)
3865 G23
Efï¬ciency vs Load Current
100
90
80
70
BURST
60
50
DCM
40
CCM
30
20
10
0
0.01
VIN = 12V
VOUT = 1.2V
FIGURE 16 CIRCUIT
0.1
1
10
100
LOAD CURRENT (A)
3865 G24
Efï¬ciency and Power Loss
vs Input Voltage
100 FIGURE 16 CIRCUIT
90
EFFICIENCY
80
70
60
POWER LOSS
50
40
30
20
0
10
20
INPUT VOLTAGE (V)
5
4
3
2
1
0
30
3865 G25
Load Step
(Burst Mode Operation)
VOUT
100mV/DIV
AC-
COUPLED
IL
5A/DIV
ILOAD
5A/DIV
500mA
TO 7A
VIN = 12V
40μs/DIV
VOUT = 1.5V
FIGURE 16 CIRCUIT
3865 G01
Load Step
(Forced Continuous Mode)
VOUT
100mV/DIV
AC-
COUPLED
IL
5A/DIV
ILOAD
5A/DIV
500mA
TO 7A
VIN = 12V
40μs/DIV
VOUT = 1.5V
FIGURE 16 CIRCUIT
Load Step
(Pulse-Skipping Mode)
VOUT
100mV/DIV
AC-
COUPLED
IL
5A/DIV
ILOAD
5A/DIV
500mA
TO 7A
3865 G02
VIN = 12V
40μs/DIV
VOUT = 1.5V
FIGURE 16 CIRCUIT
3865 G03
Inductor Current at Light Load
Prebiased Output at 1V
FORCED
CONTINUOUS
MODE
5A/DIV
Burst Mode
OPERATION
5A/DIV
PULSE-
SKIPPING MODE
5A/DIV
VIN = 12V
2μs/DIV
VOUT = 1.5V
ILOAD = 100mA
FIGURE 16 CIRCUIT
RUN
2V/DIV
VOUT = 1.5V
500mV/DIV
VTRACK/SS
1V/DIV
3865 G04
40ms/DIV
Coincident Tracking
RUN1
2V/DIV
3865 G05
VOUT1 = 1.5V
1Ω LOAD
500mV/DIV
VOUT2 = 1.2V
1Ω LOAD
500mV/DIV
40ms/DIV
3865 G06
3865fb
6
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