Datasheet

LTC3863
6
3863f
For more information www.linear.com/3863
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-Circuit Protection V
IN
Line Transient Behavior
T
A
= 25°C, unless otherwise noted.
V
IN
= 12V
V
OUT
= –5V
I
LOAD2
= 1A TO 3.2A
FIGURE 7 CIRCUIT
I
L
1A/DIV
V
OUT
500mV/DIV
I
LOAD
1A/DIV
20ms/DIV
3863 G10
V
IN
= 12V
V
OUT
= –5V
I
LOAD2
= 1A TO SHORT-CIRCUIT
FIGURE 7 CIRCUIT
I
L
1A/DIV
V
OUT
5V/DIV
SHORT-
CIRCUIT
TRIGGER
500µs/DIV
FOLDBACK
3863 G11
SOFT-START
RECOVERY
C
OUT
DISCHARGE
V
IN
= 12V, SURGE TO 48V
V
OUT
= –5V
I
LOAD
= 500mA
FIGURE 7 CIRCUIT
GATE
20V/DIV
V
OUT
50mV/DIV
V
IN
20V/DIV
10ms/DIV
3863 G12
12V
48V
V
IN
(V)
0
110
I
VIN
(µA)
115
120
125
130
140
10
20 30 40
3863 G13
50 60
135
V
IN
= 12V
V
OUT
= –5V
I
LOAD
= 0A
FIGURE 7 CIRCUIT
V
IN
(V)
0
I
VIN
(µA)
900
3863 G14
800
700
20 40
10
30 50
1000
1100
850
750
950
1050
60
V
IN
= 12V
V
OUT
= –5V
I
LOAD
= 0A
FIGURE 7 CIRCUIT
V
IN
(V)
0
0
I
VIN
(µA)
5
10
15
20
30
10
20 30 40
3863 G15
50 60
25
V
IN
= 12V
FIGURE 7 CIRCUIT
V
IN
(V)
0
–1.0
NORMALIZED ∆V
OUT
(%)
–0.5
0
0.5
1.0
10 20 30 40
3863 G16
50 60
V
OUT
= –5V
I
LOAD
= 100mA
NOMALIZED AT V
IN
= 12V
FIGURE 7 CIRCUIT
PULSE-SKIPPING MODE
Burst Mode OPERATION
I
LOAD
(A)
–0.5
–1.0
NORMALIZED ∆V
OUT
(%)
–0.5
0
0.5
1.0
0 0.5 1.0 1.5
3863 G17
2.0 2.5
V
IN
= 12V, V
OUT
= –5V
I
LOAD
NORMALIZED AT I
LOAD
= 1A
FIGURE 7 CIRCUIT
PULSE-SKIPPING MODE
Burst Mode OPERATION
TEMPERATURE (°C)
–75
NORMALIZED ∆V
OUT
(%)
0.2
0.6
1.0
125
3963 G18
–0.2
–0.6
0
0.4
0.8
–0.4
–0.8
–1.0
–25
25
75
175
V
IN
= 12V, V
OUT
= –5V
I
LOAD
= 200mA
V
OUT
NOMALIZED TO T
A
= 25°C
FIGURE 7 CIRCUIT
PULSE-SKIPPING MODE
Burst Mode OPERATION