LTC3863 Datasheet, PDF (6/36 Pages) Linear Technology – 60V Low IQ Inverting DC/DC Controller Wide Operating VIN Range: 3.5V to 60V

LTC3863
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Overcurrent Protection
I_LOAD
1A/DIV
I_L
1A/DIV
V_OUT
500mV/DIV
V_IN = 12V
20ms/DIV
V_OUT = –5V
I_LOAD2 = 1A TO 3.2A
FIGURE 7 CIRCUIT
3863 G10
Short-Circuit Protection
SHORT-
CIRCUIT
TRIGGER
V_OUT
5V/DIV
I_L
1A/DIV
FOLDBACK
C_OUT DISCHARGE
SOFT-START
RECOVERY
V_IN = 12V
500µs/DIV
V_OUT = –5V
I_LOAD2 = 1A TO SHORT-CIRCUIT
FIGURE 7 CIRCUIT
3863 G11
V_IN Line Transient Behavior
V_IN
20V/DIV
48V
12V
GATE
20V/DIV
V_OUT
50mV/DIV
10ms/DIV
V_IN = 12V, SURGE TO 48V
V_OUT = –5V
I_LOAD = 500mA
FIGURE 7 CIRCUIT
3863 G12
Burst Mode Input Current Over
Input Voltage (No Load)
140
V_IN = 12V
V_OUT = –5V
135
I_LOAD = 0A
FIGURE 7 CIRCUIT
130
125
120
115
110
0
10 20 30 40
V_IN (V)
50 60
3863 G13
Output Regulation Over Input
Voltage
1.0
V_OUT = –5V
I_LOAD = 100mA
NOMALIZED AT V_IN = 12V
0.5 ^{FIGURE 7 CIRCUIT}
0
–0.5
PULSE-SKIPPING MODE
Burst Mode OPERATION
–1.0
0 10 20 30 40 50 60
V_IN (V)
3863 G16
Pulse-Skipping Mode Input
Current Over Input Voltage
(No Load)
1100
1050
1000
V_IN = 12V
V_OUT = –5V
I_LOAD = 0A
FIGURE 7 CIRCUIT
950
900
850
800
750
700
0
10 20 30 40 50 60
V_IN (V)
3863 G14
Output Regulation Over Load
Current
1.0
V_IN = 12V, V_OUT = –5V
I_LOAD NORMALIZED AT I_LOAD = 1A
FIGURE 7 CIRCUIT
0.5
0
–0.5
–1.0
–0.5 0
PULSE-SKIPPING MODE
Burst Mode OPERATION
0.5 1.0 1.5
I_LOAD (A)
2.0 2.5
3863 G17
Shutdown Current Over Input
Voltage
30
V_IN = 12V
FIGURE 7 CIRCUIT
25
20
15
10
5
0
0 10 20 30 40 50 60
V_IN (V)
3863 G15
Output Regulation Over
Temperature
1.0
V_IN = 12V, V_OUT = –5V
0.8 I_LOAD = 200mA
0.6
V_OUT NOMALIZED TO T_A = 25°C
FIGURE 7 CIRCUIT
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–75
PULSE-SKIPPING MODE
Burst Mode OPERATION
–25
25
75 125 175
TEMPERATURE (°C)
3963 G18
3863f
6
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