Datasheet
LTC3867
7
3867f
Current Sense Threshold
vs I
TH
Voltage
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown (RUN) Threshold
vs Temperature
Regulated Feedback Voltage
vs Temperature
Oscillator Frequency
vs Temperature
UVLO Threshold (INTV
CC
)
vs Temperature
Oscillator Frequency
vs Input 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)
V
SENSE
COMMON MODE VOLTAGE (V)
0
CURRENT SENSE THRESHOLD (mV)
60
70
80
6 10
3867 G10
50
40
2 4
8 12 14
30
20
I
LIM
= INTV
CC
I
LIM
= 3.7V
I
LIM
= 1.5V
I
LIM
= FLOAT
I
LIM
= GND
FEEDBACK VOLTAGE (V)
0
80
70
60
50
40
30
20
10
300 500
3867 G12
100 200
400 600
MAXIMUM CURRENT SENSE VOLTAGE (mV)
I
LIM
= INTV
CC
I
LIM
= 3.7V
I
LIM
= 1.5V
I
LIM
= FLOAT
I
LIM
= GND
INPUT VOLTAGE (V)
5
FREQUENCY (kHz)
615
20
3867 G18
600
590
10 15 25
585
580
620
610
605
595
30 35 40
I
TH
VOLTAGE (V)
0
V
SENSE
(mV)
30
45
60
1.5
3867 G09
15
0
0.5 1
0.25 1.75
0.75 1.25 2
–15
–30
75
I
LIM
= INTV
CC
I
LIM
= GND
I
LIM
= 3.7V
I
LIM
= FLOAT
I
LIM
= 1.5V
DUTY CYCLE (%)
20
MAX V
SENSE
(mV)
40
60
80
30
50
70
20 40 60 80
3867 G11
100100 30 50 70 90
I
LIM
= INTV
CC
I
LIM
= 3.7V
I
LIM
= 1.5V
I
LIM
= FLOAT
I
LIM
= GND
TEMPERATURE (°C)
–50
RUN PIN VOLTAGE (V)
1.20
1.25
1.30
25 75
OFF
ON
3867 G14
1.15
1.10
–25 0
50 100 125
1.05
1.00
TEMPERATURE (°C)
–50
V
FB (V)
0.602
0.604
0.606
25 75
3867 G15
0.600
0.598
–25 0
50 100 125
0.596
0.594
TEMPERATURE (°C)
–50 –25
3.00
UVLO THRESHOLD (V)
3.50
4.25
0
50
75
3867 G16
3.25
4.00
3.75
25
100
125
RISING
FALLING
TEMPERATURE (°C)
–50
FREQUENCY (kHz)
620
640
660
25 75
3867 G17
600
580
–25 0
50 100 125
560
540