Datasheet

LTC3850/LTC3850-1
7
38501fc
TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Current
vs Input Voltage without EXTV
CC
INTV
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
Maximum Current Sense Voltage vs
Feedback Voltage (Current Foldback)
TK/SS Pull-Up Current
vs Temperature
Tracking Up and Down
with External Ramp
10ms/DIV
V
OUT1
3.3V
3Ω LOAD
1V/DIV
V
OUT2
1.8V
1.5Ω LOAD
1V/DIV
TK/SS1
TK/SS2
2V/DIV
38501 G10
INPUT VOLTAGE (V)
5
SUPPLY CURRENT (mA)
2
3
25
38501 G11
1
0
10
15
20
5
4
INPUT VOLTAGE (V)
INTV
CC
VOLTAGE (V)
38501 G12
4.75
5.00
5.25
4.50
4.25
4.00
3.75
3.50
0 20
5 10 15 25
V
ITH
(V)
0
–40
V
SENSE
(mV)
–20
0
20
40
60
80
0.5 1 1.5 2
38501 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
38501 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
38501 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
38501 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
TEMPERATURE (°C)
–50
2.00
1.75
1.50
1.25
1.00
25 75
38501 G17
–25 0
50 100
TK/SS CURRENT (µA)