Datasheet

LTC3853
6
3853fa
TYPICAL PERFORMANCE CHARACTERISTICS
Coincident Tracking
Prebiased Output at 2V
Maximum Current Sense Voltage vs
Feedback Voltage (Current Foldback)
Quiescent Current
vs Input Voltage Without EXTV
CC
Internal V
CC
Line Regulation
Current Sense Threshold
vs I
TH
Voltage
Maximum Current Sense Threshold
vs Common Mode Voltage
Maximum Current Sense
Threshold vs Duty Cycle
Tracking Up and Down
with External Ramp
50ms/DIV
V
OUT
1V/DIV
V
TK/SS
500mV/DIV
V
FB
500mV/DIV
3853 G08
10ms/DIVV
IN
= 12V
V
OUT1
= 3.3V
V
OUT2
= 2.5V
V
OUT3
= 1.8V
RUN1
2V/DIV
V
OUT1,2,3
1V/DIV
3853 G09
5ms/DIVV
IN
= 12V
V
OUT1
= 3.3V
V
OUT2
= 2.5V
V
OUT3
= 1.8V
TK/SS1
TK/SS2
TK/SS3
2V/DIV
V
OUT1,2,3
1V/DIV
3853 G10
INPUT VOLTAGE (V)
5
SUPPLY CURRENT (mA)
5.0
5.5
25
3853 G11
4.5
4.0
10
15
20
6.0
INPUT VOLTAGE (V)
0
4.75
5.00
5.25
20
3853 G12
4.50
4.25
5 10 15 25
4.00
3.75
3.50
INTERNAL V
CC
(V)
V
ITH
(V)
0
–40
V
SENSE
(mV)
–20
0
20
40
60
80
0.5 1 1.5 2
3853 G13
I
LIM
= INTV
CC
I
LIM
= GND
I
LIM
= FLOAT
V
SENSE
COMMON MODE VOLTAGE (V)
0
CURRENT SENSE THRESHOLD (mV)
30
40
50
3
5
20
10
0
1 2 4
60
70
80
3853 G14
I
LIM
= INTV
CC
I
LIM
= GND
I
LIM
= FLOAT
60
80
100
40
20
50
70
90
30
10
0
DUTY CYCLE (%)
0
CURRENT SENSE THRESHOLD (mV)
60
100
20 40 80
3853 G15
I
LIM
= INTV
CC
I
LIM
= GND
I
LIM
= FLOAT
FEEDBACK VOLTAGE (V)
0
MAXIMUM CURRENT SENSE VOLTAGE (mV)
40
50
60
0.8
3853 G16
30
20
0
0.2
0.4
0.6
0.1 0.9
0.3
0.5
0.7
10
80
70
I
LIM
= INTV
CC
I
LIM
= FLOAT
I
LIM
= GND