LTC3855_15 Datasheet, PDF (6/44 Pages) Linear Technology – Dual, Multiphase Synchronous DC/DC Controller with Differential Remote Sense

LTC3855
Typical Performance Characteristics
Load Step
(Burst Mode Operation)
I_LOAD
5A/DIV
300mA TO 5A
I_L
5A/DIV
V_OUT
100mV/DIV
AC-COUPLED
V_IN = 12V
V_OUT = 1.8V
50µs/DIV
3855 G01
Load Step
(Forced Continuous Mode)
I_LOAD
5A/DIV
300mA TO 5A
I_L
5A/DIV
V_OUT
100mV/DIV
AC-COUPLED
V_IN = 12V
V_OUT = 1.8V
50µs/DIV
3855 G02
Load Step
(Pulse-Skipping Mode)
I_LOAD
5A/DIV
300mA TO 5A
I_L
5A/DIV
V_OUT
100mV/DIV
AC-COUPLED
V_IN = 12V
V_OUT = 1.8V
50µs/DIV
3855 G03
Inductor Current at Light Load
FORCED
CONTINUOUS MODE
5A/DIV
Burst Mode
OPERATION
5A/DIV
PULSE-SKIPPING
MODE
5A/DIV
V_IN = 12V
V_OUT = 1.8V
I_LOAD = 400mA
1µs/DIV
3855 G04
Prebiased Output at 2V
V_OUT
2V/DIV
V_FB
500mV/DIV
TK/SS
500mV/DIV
V_IN = 12V
V_OUT = 3.3V
2ms/DIV
3855 G05

Coincident Tracking
RUN
2V/DIV
V_OUT1
V_OUT1
V_OUT2
1V/DIV
5ms/DIV
V_OUT1 = 1.8V, 1.5Ω LOAD
V_OUT2 = 1.2V, 1Ω LOAD
V_OUT2
3855 G06
3855f