Datasheet

LTC3890-1
6
38901fb
TYPICAL PERFORMANCE CHARACTERISTICS
Total Input Supply Current
vs Input Voltage
EXTV
CC
Switchover and INTV
CC
Voltages vs Temperature
INTV
CC
Line Regulation
Maximum Current Sense Voltage
vs I
TH
Voltage
SENSE
–
Pin Input Bias Current
Maximum Current Sense
Threshold vs Duty Cycle
Foldback Current Limit Quiescent Current vs Temperature
INTV
CC
vs Load Current
DUTY CYCLE (%)
0
MAXIMUM CURRENT SENSE VOLTAGE (mV)
75
85
80
80
38901 G15
65
70
60
20
40
50
100
90
60
10
30
90
70
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (µA)
200
300
20 30 35 40 45 50 55 60 6515105 25
38901 G10
150
100
50
250
NO LOAD
300µA LOAD
V
OUT
= 3.3V
FIGURE 13 CIRCUIT
V
SENSE
COMMON MODE VOLTAGE (V)
0
SENSE
–
CURRENT (µA)
20
38901 G14
400
300
10 155 25
800
700
600
500
200
100
0
–100
TEMPERATURE (°C)
–75
QUIESCENT CURRENT (µA)
75
50250
38901 G17
60
50
–50 –25 75
45
30
40
35
80
70
65
55
100 125 150
V
IN
= 12V
LOAD CURRENT (mA)
0
INTV
CC
VOLTAGE (V)
5.25
40
38901 G18
4.50
20 60
4.00
5.50
5.00
4.75
4.25
80 100
EXTV
CC
= 5V
EXTV
CC
= 8.5V
EXTV
CC
= 0V
V
IN
= 12V
V
ITH
(V)
0
CURRENT SENSE THESHOLD (mV)
40
60
80
0.6 1.0
38901 G13
20
0
0.2 0.4
0.8 1.2 1.4
–20
–40
Burst Mode
OPERATION
PULSE-SKIPPING MODE
5% DUTY CYCLE
FORCED CONTINUOUS MODE
INPUT VOLTAGE (V)
3.0
INTV
CC
VOLTAGE (V)
4.0
4.5
5.5
20 30 35 40 45 50 55 60 6515100 5 25
38901 G12
3.5
5.0
I
LOAD
= 10mA
TEMPERATURE (°C)
–75
4.0
EXTV
CC
AND INTV
CC
VOLTAGE (V)
4.2
4.6
4.8
5.0
6.0
5.4
–25
25 50 75
100
38901 G11
4.4
5.6
5.8
5.2
–50
0
125
150
INTV
CC
EXTV
CC
RISING
EXTV
CC
FALLING
FEEDBACK VOLTAGE (MV)
0
MAXIMUM CURRENT SENSE VOLTAGE (mV)
40
60
800
38901 G16
20
0
200
400
500
80
30
50
10
70
600
100
300
700