Datasheet

LTC4218
5
4218ff
TYPICAL PERFORMANCE CHARACTERISTICS
I
DD
vs V
DD
INTV
CC
Load Regulation
UV Low-High Threshold
vs Temperature
UV Hysteresis vs Temperature
Timer Pull-Up Current
vs Temperature Current Limit Delay
Current Limit Threshold Foldback Current Limit Adjustment I
SET
Resistor vs Temperature
T
A
= 25°C, V
DD
= 12V unless otherwise noted.
V
DD
(V)
0
1.0
I
DD
(mA)
1.2
1.4
1.6
1.8
2.0
5 101520
4218 G01
25 30
–40°C
25°C
85°C
I
LOAD
(mA)
0
0
0.5
1.5
1.0
INTV
CC
(V)
3.5
2.0
2.5
3.0
4218 G02
–14–12–10–8–6–4–2
V
DD
= 5V
V
DD
= 3.3V
TEMPERATURE (°C)
–50
UV LOW-HIGH HRESHOLD (V)
1.234
1.232
1.230
1.228
1.226
–25 0 25
4218 G03
50 75 100
TEMPERATURE (°C)
–50
UV HYSTERESIS (V)
0.10
0.08
0.06
0.04
–25 0 25
4218 G04
50 75 100
TEMPERATURE (°C)
–50
TIMER PULL-UP CURRENT (μA)
–110
–105
–100
–95
–90
–25 0 25
4218 G05
50 75 100
CURRENT LIMIT SENSE VOLTAGE
(V
SENSE
+
– V
SENSE
–
) (mV)
CURRENT LIMIT PROPAGATION DELAY (μs)
1000
100
10
1
0.1
075
4218 G06
15 30 45 60
C
GATE
= 10nF
FB VOLTAGE (V)
0
0
CURRENT LIMIT SENSE VOLTAGE
(V
SENSE
+
– V
SENSE
–
) (mV)
4
8
2
6
10
12
14
16
0.2 0.4 0.6 0.8
4218 G07
1.0 1.2
R
SET
(Ω)
1k
CURRENT LIMIT SENSE VOLTAGE
(V
DD
– V
SENSE
) (mV)
10k 100k 1M
4218 G08
10M
0
4
8
2
6
10
12
14
16
TEMPERATURE (°C)
–50
R
ISET
(kΩ)
22
21
20
19
18
–25 0 25
4218 G09
50 75 100