Datasheet

LTC3866
6
3866fb
INTV
CC
Line Regulation
Current Sense Threshold
vs ITH Voltage
Maximum Current Sense Threshold
vs Common Mode Voltage
Load Step
(Burst Mode
®
Operation)
Inductor Current at Light Load
Load Step
(Continuous Conduction Mode)
Prebiased Output at 1.2V
Load Step
(Pulse-Skipping Mode)
Tracking Up and Down with
TK/SS External Ramp
TYPICAL PERFORMANCE CHARACTERISTICS
I
LOAD
10A/DIV
1.5A TO 15A
V
OUT
100mV/DIV
AC-COUPLED
20µs/DIV
3866 G04
V
IN
= 12V
V
OUT
= 1.5V
FRONT PAGE CIRCUIT
I
L
10A/DIV
0A
0A
I
LOAD
10A/DIV
1.5A TO 15A
V
OUT
100mV/DIV
AC-COUPLED
20µs/DIV
3866 G05
V
IN
= 12V
V
OUT
= 1.5V
FRONT PAGE CIRCUIT
I
L
10A/DIV
0A
0A
I
LOAD
10A/DIV
1.5A TO 15A
V
OUT
100mV/DIV
AC-COUPLED
20µs/DIV
3866 G06
V
IN
= 12V
V
OUT
= 1.5V
FRONT PAGE CIRCUIT
I
L
10A/DIV
0A
0A
CONTINUOUS
CONDUCTION
MODE 5A/DIV
PULSE-SKIPPING
MODE
5A/DIV
10µs/DIV
3866 G07
V
IN
= 12V
V
OUT
= 1.5V
I
LOAD
= 300mA
Burst Mode
OPERATION
5A/DIV
0A
0A
0A
V
OUT
500mV/DIV
V
FB
500mV/DIV
500µs/DIV
3866 G08
V
IN
= 12V
V
OUT
= 1.5V
0V
0V
TRACK/SS 500mV/DIV
V
TK/SS
0.2V/DIV
V
OUT
0.5V/DIV
2.5ms/DIV
3866 G09
V
IN
= 12V
V
OUT
= 1.5V
1Ω LOAD
0V
V
TK/SS
V
OUT
INPUT VOLTAGE (V)
0
0
INTV
CC
VOLTAGE (V)
1
2
3
4
10 20
30
40
3866 G10
5
6
5 15
25
35
V
ITH
(V)
0
–10
CURRENT SENSE THRESHOLD (mV)
–5
5
10
15
40
25
0.5
1.0
1.25
3866 G11
0
30
35
20
0.25 0.75
1.5
1.75
2.0
I
LIM
= 0V
I
LIM
= 1/4 INTV
CC
I
LIM
= 1/2 INTV
CC
I
LIM
= 3/4 INTV
CC
I
LIM
= INTV
CC
V
SENSE
COMMON MODE VOLTAGE (V)
0
CURRENT SENSE THRESHOLD (mV)
20
30
4.0
3866 G12
10
0
1.0
2.0
3.0
0.5
1.5
2.5
3.5
40
15
25
5
35
I
LIM
= INTV
CC
I
LIM
= 0V
I
LIM
= 3/4 INTV
CC
I
LIM
= 1/4 INTV
CC
I
LIM
= 1/2 INTV
CC
T
A
= 25°C, unless otherwise noted.