Datasheet
LTC3864
6
3864f
TYPICAL PERFORMANCE CHARACTERISTICS
Burst Mode Input Current Over
Input Voltage (No Load)
Pulse-Skipping Mode Input
Current Over Input Voltage
(No Load)
Shutdown Current Over Input
Voltage
Output Regulation Over Input
Voltage
Output Regulation Over Load
Current
Output Regulation Over
Temperature
Overcurrent Protection Short-Ciruit Protection V
IN
Line Transient Behavior
T
A
= 25°C, unless otherwise noted.
V
IN
= 12V, V
OUT
= 5V
FIGURE 8 CIRCUIT
V
OUT
500mV/DIV
I
L
1A/DIV
I
LOAD
1A/DIV
1A 1A
20ms/DIV
3864 G10
3.2A
V
OUT
DROOPS DUE TO
REACHING CURRENT LIMIT
V
IN
= 12V, V
OUT
= 5V
FIGURE 8 CIRCUIT
I
L
2A/DIV
V
OUT
5V/DIV
SHORT-
CIRCUIT
TRIGGER
500µs/DIV
3864 G11
SHORT-CIRCUIT REGION
SOFT RECOVERY
FROM SHORT
V
IN
(V)
0
30
I
VIN
(µA)
35
55
50
45
40
60
65
70
10
20 30 40
3864 G13
50 60
V
IN
= 12V, V
OUT
= 5V
I
LOAD
= 0A
FIGURE 8 CIRCUIT
V
IN
(V)
0
700
I
VIN
(µA)
850
800
750
900
950
10
20 30 40
3864 G14
50 60
V
IN
= 12V, V
OUT
= 5V
I
LOAD
= 0A
FIGURE 8 CIRCUIT
V
IN
(V)
0
0
I
VIN
(µA)
15
10
5
20
25
10
20 30 40
3864 G15
50 60
FIGURE 8 CIRCUIT
V
IN
= 12V, SURGE TO 48V
V
OUT
= 5V
I
LOAD
= 200mA, FIGURE 8 CIRCUIT
V
OUT
50mV/DIV
GATE
20V/DIV
V
IN
20V/DIV
2ms/DIV
3864 G12
V
IN
(V)
0
–0.010
NORMALIZED ∆V
OUT
(%)
0
–0.005
0.005
0.010
10
20 30 40
3864 G16
50 60
V
OUT
= 5V
I
LOAD
= 200mA
V
OUT
NORMALIZED AT V
IN
= 12V
FIGURE 8 CIRCUIT
Burst Mode OPERATION
PULSE-SKIPPING
I
LOAD
(A)
–0.5
–0.010
NORMALIZED ∆V
OUT
(%)
0
–0.005
0.005
0.010
0
0.5 1 1.5
3864 G17
2 2.5
V
IN
= 12V, V
OUT
= 5V
I
LOAD
NORMALIZED AT I
LOAD
= 1A
FIGURE 8 CIRCUIT
Burst Mode OPERATION
PULSE-SKIPPING
TEMPERATURE
(°C)
–75
–1.0
NORMALIZED ∆V
OUT
(%)
0
1.0
0.8
0.6
0.4
0.2
–0.2
–0.4
–0.6
–0.8
–25
25 75 125
3864 G18
175
V
IN
= 12V, V
OUT
= 5V
I
LOAD
= 200mA
V
OUT
NORMALIZED TO T
A
= 25°C
FIGURE 8 CIRCUIT
Burst Mode OPERATION
PULSE-SKIPPING