LTC3856 LINER [Linear Technology], LTC3856 Datasheet - Page 6

• Manufacturer Part Number: LTC3856
• Description: 2-Phase Synchronous Step-Down DC/DC Controller with Diffamp
• Manufacturer: LINER [Linear Technology]

LTC3856
Typical perForMance characTerisTics

100mV/DIV
200mV/DIV
40A/DIV
20A/DIV
20A/DIV
10V/DIV
10V/DIV
I
V
V
V
V
LOAD
SW1
SW2
100
OUT
OUT
I
I
90
80
70
60
50
40
30
20
10
L1
L2
0
0.1
Load Step:
Burst Mode Operation
Efficiency vs Output Current
and Mode
Stage Shedding Transition,
1-Phase to 2-Phase
V
V
I
V
V
LOAD
V
I
C
IN
OUT
IN
OUT
CPO
BAT
CPO
= 12V
= 12V
Stage
Shedding
MODE
= 1.5V
= 1.5V
= 1A TO 40A
= 200µA
= 3.6V
= 2.2 F
Burst Mode
OPERATION
UNDERSHOOT
LOAD CURRENT (A)
1
35mV
100µs/DIV
10µs/DIV
FORCED
CONTINUOUS
MODE
10
V
V
IN
OUT
= 12V
= 1.5V
3856 G01
3856 G05
3856 G03
100
OPERATION, 5A/DIV
DCM OPERATION,
MODE, 5A/DIV
CONTINUOUS
200mV/DIV
100mV/DIV
Burst Mode
FORCED
10V/DIV
10V/DIV
40A/DIV
20A/DIV
20A/DIV
5A/DIV
V
V
I
V
V
LOAD
SW1
SW2
OUT
OUT
I
I
L1
L2
V
V
Load Step:
Forced Continuous Mode
V
V
I
Inductor Current at Light Load
Stage Shedding Transition,
2-Phase to 1-Phase
V
V
I
LOAD
LOAD
IN
OUT
V
I
C
IN
OUT
V
I
C
IN
OUT
CPO
CPO
BAT
CPO
BAT
CPO
= 12V
= 12V
= 12V
= 1.5V
= 1.5V
= 1.5V
= 200µA
= 1A TO 40A
= 3.6V
= 200µA
= 400mA
= 2.2 F
= 3.6V
= 2.2 F
OVERSHOOT
36mV
100µs/DIV
10µs/DIV
1µs/DIV
3856 G02
3856 G06
3856 G04
3856f