Datasheet

LTC4274A/LTC4274C
8
4274acfc
TYPICAL PERFORMANCE CHARACTERISTICS
802.3af I
LIM
Threshold
vs Temperature
DC Disconnect Threshold
vs Temperature
Current Limit Foldback
ADC Noise Histogram
Current Readback in Fast Mode
ADC Integral Nonlinearity
Current Readback in Fast Mode
802.3at I
CUT
Threshold
vs Temperature
802.3af I
CUT
Threshold
vs Temperature
TEMPERATURE (°C)
–40
105.00
V
LIM
(mV)
I
LIM
(mA)
106.50
105.75
107.25
108.00
420
423
426
429
432
040
4274AC G10
80 120
V
DD
= 3.3V
V
EE
= –54V
R
SENSE
= 0.25
REG 48h = 80h
TEMPERATURE (°C)
–40
158
V
CUT
(mV)
I
CUT
(mA)
161
160
159
162
163
630
636
640
648
644
652
040
4274AC G11
80 120
V
DD
= 3.3V
V
EE
= –54V
R
SENSE
= 0.25
REG 47h = E2h
TEMPERATURE (°C)
–40
93.00
V
CUT
(mV)
I
CUT
(mA)
94.50
93.75
95.25
96.00
372
375
378
381
384
040
4274AC G12
80 120
V
DD
= 3.3V
V
EE
= –54V
R
SENSE
= 0.25
REG 47h = D4h
TEMPERATURE (°C)
–40
V
MIN
(mV)
I
MIN
(mV)
7.00
7.50
7.25
7.75
8.00
1.7500
1.8125
1.8750
1.9375
2.0000
040
4274AC G13
80 120
V
DD
= 3.3V
V
EE
= –54V
R
SENSE
= 0.25
REG 47h = E2h
V
OUTn
(V)
–54
0
I
LIM
(mA)
V
LIM
(mV)
900
800
700
600
500
400
300
200
100
0
225
200
175
150
125
100
75
50
25
–36–45
–27
4274AC G14
–18
–9 0
V
DD
= 3.3V
V
EE
= –54V
R
SENSE
= 0.25
REG 48h = C0h
ADC OUTPUT
191
0
B
IN
COUNT
400
350
300
250
200
150
100
50
193192
194
4274AC G15
195
196
V
SENSE
– V
EE
= 110.4mV
CURRENT SENSE RESISTOR INPUT VOLTAGE (mV)
0
ADC INTEGRAL NONLINEARITY (LSBs)
0
0.5
400
4274AC G16
–0.5
–1.0
100
200
250
500
1.0
300
50
150
450
350