LTC3890
Typical perForMance characTerisTics
Total Input Supply Current
vs Input Voltage
EXTVCC Switchover and INTVCC
Voltages vs Temperature
INTVCC Line Regulation
300
250
200
150
100
6.0
5.8
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
5.5
5.0
V
= 3.3V
OUT
FIGURE 13 CIRCUIT
INTV
CC
300µA LOAD
4.5
4.0
3.5
3.0
EXTV RISING
CC
EXTV FALLING
CC
NO LOAD
50
0
I
= 10mA
LOAD
–75
–25
0
25 50 75 100 125 150
–50
5
10 15 20 25 30 35 40 45 50 55 60 65
0
5
10 15 20 25 30 35 40 45 50 55 60 65
INPUT VOLTAGE (V)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
3890 G10
3890 G11
3890 G12
Maximum Current Sense Voltage
vs ITH Voltage
Maximum Current Sense
Threshold vs Duty Cycle
SENSE– Pin Input Bias Current
80
60
40
20
800
700
600
500
400
300
200
100
0
80
70
5% DUTY CYCLE
I
= FLOAT
LIM
PULSE-SKIPPING MODE
60
50
Burst Mode
OPERATION
I
= INTV
CC
LIM
I
= GND
= INTV
LIM
40
30
20
0
–20
–40
I
LIM
CC
I
= GND
LIM
I
= FLOAT
LIM
FORCED CONTINUOUS MODE
–100
0.8
(V)
1.2
1.4
0
10 20 30 40 50 60 70 80 90 100
0
0.2
0.4 0.6
1.0
5
10
15
25
0
20
V
DUTY CYCLE (%)
ITH
V
SENSE
COMMON MODE VOLTAGE (V)
3890 G13
3890 G15
3890 G14
Foldback Current Limit
Quiescent Current vs Temperature
INTVCC vs Load Current
80
75
70
65
60
55
50
45
40
35
30
80
70
60
50
40
30
20
10
0
5.50
5.25
5.00
V
= 12V
V
= 12V
IN
IN
I
= FLOAT
LIM
EXTV = 0V
CC
I
= INTV
LIM
CC
EXTV = 8.5V
CC
4.75
4.50
4.25
4.00
EXTV = 5V
CC
I
= GND
LIM
–50 –25
75 100 125 150
TEMPERATURE (°C)
–75
0
25 50
0
100 200 300 400 500 600 700 800
FEEDBACK VOLTAGE (MV)
3890 G16
20
60
LOAD CURRENT (mA)
80
100
0
40
3890 G17
3890 G18
3890fb
6
Linear Systems [ Linear Systems ]
