Datasheet

LTC4268-1
6
42681fc
INPUT VOLTAGE (V)
0
0
INPUT CURRENT (mA)
0.1
0.2
0.3
0.4
0.5
–2
–4 –6 –8
42681 G01
–10
T
A
= 25°C
INPUT VOLTAGE (V)
0
0
INPUT CURRENT (mA)
20
40
60
80
100
–10
–20 –30
*OPTIONAL CLASS 5 CURRENT
–40
42681 G02
–50 –60
T
A
= 25°C
CLASS 5*
CLASS 4
CLASS 3
CLASS 2
CLASS 1
CLASS 0
INPUT VOLTAGE (V)
–12
9.0
INPUT CURRENT (mA)
9.5
10.5
11.0
11.5
–14
–16
42681 G03
10.0
–18
–20 –22
12.0
85°C
–40°C
CLASS 1 OPERATION
INPUT VOLTAGE (V)
–1
22
V1:
V2:
SIGNATURE RESISTANCE (kΩ)
23
25
26
27
–3
–5
42681 G04
24
–7
–9
–6 –10
–2 –4
–8
28
RESISTANCE =
DIODES: DF1501S
T
A
= 25°C
=
∆V
∆I
V2 – V1
I
2
– I
1
IEEE UPPER LIMIT
IEEE LOWER LIMIT
LTC4268-1 + 2 DIODES
LTC4268-1 ONLY
INPUT
VOLTAGE
10V/DIV
CLASS
CURRENT
20mA/DIV
TIME (10µs/DIV)
42681 G05
T
A
= 25°C
JUNCTION TEMPERATURE (°C)
–50
0
RESISTANCE (Ω)
0.2
0.4
0.6
0.8
1.0
–25
0 25 50
42681 G06
75 100
INPUT CURRENT (mA)
0
V
PWRGD_OUT
– V
PORTN
(V)
2
3
8
42681 G07
1
0
2
4
6
10
4
T
A
= 25°C
INPUT CURRENT (mA)
0
0
PWRGD – V
NEG
(V)
0.4
1.0
0.5
1
42681 G08
0.2
0.8
0.6
1.5
2
T
A
= 25°C
GND – V
NEG
= 4V
INPUT VOLTAGE (V)
–40
200
CURRENT LIMIT (mA)
400
600
800
–40°C
–40°C
85°C
85°C
–45 –50
42681 G09
–55 –60
HIGH CURRENT MODE
LOW CURRENT MODE
Typical perForMance characTerisTics
Input Current vs Input Voltage
25k Detection Range Input Current vs Input Voltage Input Current vs Input Voltage
Signature Resistance
vs Input Voltage Class Operation vs Time On Resistance vs Temperature
Active Low PWRGD: Output Low
Voltage vs Current
Active High PWRGD: Output Low
Voltage vs Current Current Limit vs Input Voltage