Datasheet

LTC4270/LTC4271
9
42701fc
802.3at I
LIM
Threshold
vs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
DC Disconnect Threshold
vs Temperature 802.3at Current Limit Foldback
INT and SDAOUT Pull Down
Voltage vs Load Current
MOSFET Gate Drive With Fast
Pull Down
802.3at I
CUT
Threshold
vs Temperature
TEMPERATURE (°C)
–40
204
V
LIM
(mV)
I
LIM
(mA)
216
212
208
220
816
864
848
832
880
40 60 80 100 120–20 0
42701 G09
20
PORT 1
REG 48h = C0h
R
SENSE
= 0.25Ω
TEMPERATURE (°C)
–40
152
V
CUT
(mV)
I
CUT
(mA)
162
164
160
158
156
154
166
608
648
640
632
624
616
664
656
40 60 80 100 120–20 0
42701 G10
20
PORT 1
REG 47h = E2h
R
SENSE
= 0.25Ω
TEMPERATURE (°C)
–40
1.25
V
MIN
(mV)
I
MIN
(mA)
2.00
2.25
1.75
1.50
2.50
5
8
7
6
10
9
40 60 80 100 120–20 0
42701 G11
20
PORT 1
REG 47h = E2h
R
SENSE
= 0.25Ω
V
OUTn
(V)
–54
0
I
LIM
(mA)
V
LIM
(mV)
600
500
800
700
400
300
200
100
900
0
125
100
75
50
25
225
200
175
150
–36 –27 –18 –9 0–45
42701 G12
PORT 1
REG 48h = C0h
R
SENSE
= 0.25Ω
100µs/DIV
GND
0mA
42701 G14
V
EE
V
EE
PORT
CURRENT
500mA/DIV
GATE
VOLTAGE
10V/DIV
PORT
VOLTAGE
20V/DIV
CURRENT LIMIT
50Ω FAULT REMOVED
50Ω
FAULT
APPLIED
V
DD
= 3.3V
V
EE
= –54V
FAST PULL DOWN
LOAD CURRENT (mA)
42701 G13
0 2010 30 40 50 60
3.0
2.5
2.0
1.5
1.0
0.5
0.0
PULLDOWN VOLTAGE (V)