Datasheet

5
LTC3830/LTC3830-1
3830fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Maximum G1 Duty Cycle
vs Temperature
I
MAX
Sink Current
vs Temperature Output Overcurrent Protection
Output Current Limit Threshold
vs Temperature
Soft-Start Source Current
vs Temperature
Soft-Start Sink Current
vs (V
IFB
– V
IMAX
)
TEMPERATURE (°C)
–50
91
MAXIMUM G1 DUTY CYCLE (%)
92
94
95
96
50
100
3830 G11
93
0
–25
75 100
25 125
97
98
99
V
FB
= 0V
REFER TO FIGURE 3
TEMPERATURE (°C)
–50
I
MAX
SINK CURRENT (µA)
18
25
3830 G12
12
8
–25 0 50
6
4
20
16
14
10
75 100 125
OUTPUT CURRENT (A)
0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
3830 G13
2 4 6 8 10 12 14
OUTPUT VOLTAGE (V)
T
A
= 25°C
REFER TO FIGURE 12
R
IMAX
= 5k
TEMPERATURE (°C)
–50
0
OUTPUT CURRENT LIMIT (A)
4
2
6
8
10
16
12
0
50
75
3830 G14
14
–25
25
100
125
REFER TO FIGURE 12 AND NOTE 10 OF
THE ELECTRICAL CHARACTERISTICS
R
IMAX
= 5k
TEMPERATURE (°C)
–50
SOFT-START SOURCE CURRENT (µA)
–9
25
3830 G15
–12
–14
–25 0 50
–15
–16
–8
–10
–11
–13
75 100 125
V
IFB
– V
IMAX
(mV)
–150
SOFT-START SINK CURRENT (mA)
0.75
1.00
1.25
–75
–25
3830 G16
0.50
0.25
0
–125 –100 –50
1.50
1.75
2.00
0
T
A
= 25°C
Undervoltage Lockout Threshold
Voltage vs Temperature
V
CC
Operating Supply Current
vs Temperature
PV
CC
Supply Current
vs Oscillator Frequency
TEMPERATURE (°C)
–50
2.0
UNDERVOLTAGE LOCKOUT THRESHOLD VOLTAGE (V)
2.1
2.3
2.4
2.5
3.0
2.7
0
50
75
3830 G17
2.2
2.8
2.9
2.6
–25
25
100
125
TEMPERATURE (°C)
–50
V
CC
OPERATING SUPPLY CURRENT (mA)
0.8
1.4
1.5
1.6
0
50
75
3830 G18
0.6
1.2
1.0
0.7
1.3
0.5
0.4
1.1
0.9
–25
25
100
125
FREQSET FLOATING
OSCILLATOR FREQUENCY (kHz)
0
0
PV
CC
SUPPLY CURRENT (mA)
10
30
40
50
200
400
500
90
3830 G19
20
100 300
60
70
80
T
A
= 25°C
G1 AND G2 LOADED
WITH 6800pF,
PV
CC1,2
= 12V
G1 AND G2
LOADED
WITH 1000pF,
PV
CC1,2
= 5V
G1 AND G2
LOADED
WITH 6800pF,
PV
CC1,2
= 5V