Datasheet

LTC3852
5
3852f
TYPICAL PERFORMANCE CHARACTERISTICS
Load Step
Load Step
(Burst Mode Operation)
Load Step
(Forced Continuous Mode)
Load Step
(Pulse-Skipping Mode) Inductor Current at Light Load
Start-Up with Prebiased Output
at 0.5V
Effi ciency vs Output Current
and Mode
LOAD CURRENT (A)
0.01
40
EFFICIENCY(%)
60
80
0.1 1 10 100
3852 G02
20
0
100
CCM
PULSE-SKIPPING
Burst Mode OPERATION
FIGURE 16 CIRCUIT
I
LOAD
10A/DIV
1A TO 12A
V
OUT
100mV/DIV
AC-COUPLED
I
L
10A/DIV
20µs/DIVV
OUT
= 1.2V
V
IN1
= 3.3V
FIGURE 17 CIRCUIT
3852 G05
I
LOAD
10A/DIV
5A TO 15A
V
OUT
100mV/DIV
AC-COUPLED
I
L
10A/DIV
50µs/DIV
3852 G04
V
OUT
= 1.5V
V
IN1
= 3.3V
FIGURE 16 CIRCUIT
I
LOAD
10A/DIV
1A TO 12A
V
OUT
100mV/DIV
AC-
COUPLED
I
L
10A/DIV
20µs/DIVV
OUT
= 1.2V
V
IN1
= 3.3V
FIGURE 17 CIRCUIT
3852 G06
I
LOAD
10A/DIV
1A TO 12A
V
OUT
100mV/DIV
AC-
COUPLED
I
L
10A/DIV
20µs/DIVV
OUT
= 1.2V
V
IN1
= 3.3V
FIGURE 17 CIRCUIT
3852 G07
FORCED
CONTINOUS
MODE
5A/DIV
PULSE-
SKIPPING
MODE 5A/DIV
Burst Mode
OPERATION
5A/DIV
1µs/DIVV
OUT
= 1.5V
V
IN2
= 3.3V
I
LOAD
= 500mA
FIGURE 17 CIRCUIT
3852 G08
V
OUT
1V/DIV
V
FB
0.5V/DIV
0V
20ms/DIV
3852 G09
TRACK/SS
0.5V/DIV
FIGURE 16 CIRCUIT
Coincident Tracking with Master
Supply
Ratiometric Tracking with Master
Supply
V
MASTER
0.5V/DIV
V
OUT
2A LOAD
0.5V/DIV
100ms/DIV
3852 G10
FIGURE 16 CIRCUIT
0V
V
MASTER
0.5V/DIV
V
OUT
2A LOAD
0.5V/DIV
10ms/DIV
3852 G11
FIGURE 16 CIRCUIT
0V