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LTC3856_15 Datasheet, PDF (6/40 Pages) Linear Technology – 2-Phase Synchronous Step-Down DC/DC Controller with Diffamp
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LTC3856
Typical Performance Characteristics
Load Step:
Burst Mode Operation
VBAT = 3.6V
ILOAD ICPO = 200µA
40A/DIV CCPO = 2.2ΩF
IL1
20A/DIV
IL2
20A/DIV
VOUT
200mV/DIV
100µs/DIV
VIN = 12V
VOUT = 1.5V
ILOAD = 1A TO 40A
3856 G01
Load Step:
Forced Continuous Mode
VBAT = 3.6V
ILOAD ICPO = 200µA
40A/DIV CCPO = 2.2ΩF
IL1
20A/DIV
IL2
20A/DIV
VOUT
200mV/DIV
100µs/DIV
VIN = 12V
VOUT = 1.5V
ILOAD = 1A TO 40A
3856 G02
Efficiency vs Output Current
and Mode
100
Burst Mode
90
OPERATION
80
70
60
50
Stage
Shedding
40
MODE
FORCED
CONTINUOUS
MODE
30
20
10
0
0.1
VIN = 12V
VOUT = 1.5V
1
10
LOAD CURRENT (A)
100
3856 G03
Stage Shedding Transition,
1-Phase to 2-Phase
VOUT
100mV/DIV
UNDERSHOOT
35mV
Inductor Current at Light Load
FORCED
CONTINUOUS
MODE, 5A/DIV
VBAT = 3.6V
ICPO = 200µA
CCPO = 2.2ΩF
Burst Mode
OPERATION, 5A/DIV
DCM OPERATION,
5A/DIV
VIN = 12V
VOUT = 1.5V
ILOAD = 400mA
1µs/DIV
3856 G04
Stage Shedding Transition,
2-Phase to 1-Phase
VOUT
100mV/DIV
OVERSHOOT
36mV
VSW1
10V/DIV
VSW2
10V/DIV
VIN = 12V
VOUT = 1.5V
10µs/DIV
3856 G05
VSW1
10V/DIV
VSW2
10V/DIV
VIN = 12V
VOUT = 1.5V
10µs/DIV
3856 G06
3856f

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