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LTC4274AIUHF-3#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
LTC4274A/LTC4274C
7
4274acfd
For more information www.linear.com/LTC4274A
TYPICAL PERFORMANCE CHARACTERISTICS
Power-On Sequence in
AUTO Pin Mode
Powering Up into a 180µF Load
802.3af Classification in
AUTO Pin Mode
2-Event Classification in
AUTO Pin Mode
Classification Transient Response
to 40mA Load Step
Classification Current Compliance
V
DD
Supply Current vs Voltage V
EE
Supply Current vs Voltage
802.3at I
LIM
Threshold
vs Temperature
100ms/DIV
–70
–60
PORT VOLTAGE (V)
10
0
–10
–20
–30
–40
–50
4274AC G01
V
DD
= 3.3V
V
EE
= –54V
FORCED CURRENT DETECTION
FORCED VOLTAGE
DETECTION
802.3af
CLASSIFICATION
POWER ON
GND
V
EE
5ms/DIV
GND
0mA
4274AC G02
V
EE
V
EE
GATE
VOLTAGE
10V/DIV
PORT
CURRENT
200 mA/DIV
PORT
VOLTAGE
20V/DIV
FOLDBACK
FET ON
425mA
CURRENT LIMIT
LOAD
FULLY
CHARGED
V
DD
= 3.3V
V
EE
= –54V
5ms/DIV
V
EE
–18.4
PORT
10V/DIV
V
DD
= 3.3V
V
EE
= –55V
PD IS CLASS 1
10ms/DIV
V
EE
–17.6
PORT
VOLTAGE
10V/DIV
GND
4274AC G04
V
DD
= 3.3V
V
EE
= –55V
PD IS CLASS 4
1ST CLASS EVENT
2ND CLASS EVENT
50µs/DIV
40mA
0mA
4274AC G05
–20V
PORT
VOLTAGE
1V/DIV
PORT
CURRENT
20mA/DIV
V
DD
= 3.3V
V
EE
= –54V
CLASSIFICATION CURRENT (mA)
–20
CLASSIFICATION VOLTAGE (V)
–18
–16
–14
–12
–10
–8
–6
–4
–2
0
0 10 20 30
4274AC G06
40 50 60
70
V
DD
= 3.3V
V
EE
= –54V
T
A
= 25°C
V
DD
SUPPLY VOLTAGE (V)
2.7
0.8
I
DD
SUPPLY CURRENT (mA)
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
2.9 3.1 3.3 3.5
4274AC G07
3.7 3.9 4.1
4.3
85°C
25°C
–40°C
V
EE
SUPPLY VOLTAGE (V)
–60
2.0
I
EE
SUPPLY CURRENT (mA)
2.1
2.2
2.3
2.4
–55 –50 –45 –40
4274AC G08
–35 –30 –25
–20
85°C
25°C
–40°C
TEMPERATURE (°C)
–40
210
V
LIM
(mV)
I
LIM
(mA)
211
213
212
214
215
840
844
852
848
856
860
0 40
4274AC G09
–80 120
V
DD
= 3.3V
V
EE
= –54V
R
SENSE
= 0.25Ω
REG 48h = C0h
LTC4274A/LTC4274C
8
4274acfd
For more information www.linear.com/LTC4274A
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
0 40
4274AC G10
80 120
V
DD
= 3.3V
V
EE
= –54V
R
SENSE
= 0.25Ω
REG 48h = 80h
TEMPERATURE (°C)
–40
158
V
CUT
(mV)
I
CUT
(mA)
161
160
159
162
163
630
636
640
648
644
652
0 40
4274AC G11
80 120
V
DD
= 3.3V
V
EE
= –54V
R
SENSE
= 0.25Ω
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
0 40
4274AC G12
80 120
V
DD
= 3.3V
V
EE
= –54V
R
SENSE
= 0.25Ω
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
0 40
4274AC G13
80 120
V
DD
= 3.3V
V
EE
= –54V
R
SENSE
= 0.25Ω
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
= 0.25Ω
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
LTC4274A/LTC4274C
9
4274acfd
For more information www.linear.com/LTC4274A
TYPICAL PERFORMANCE CHARACTERISTICS
ADC Noise Histogram
Current Readback in Slow Mode
ADC Integral Nonlinearity
Current Readback in Slow Mode
ADC Noise Histogram Port
Voltage Readback in Fast Mode
ADC Integral Nonlinearity
Voltage Readback in Fast Mode
ADC Noise Histogram Port
Voltage Readback in Slow Mode
ADC Integral Nonlinearity
Voltage Readback in Slow Mode
INT and SDAOUT Pull-Down Voltage
vs Load Current
MOSFET Gate Drive with Fast
Pull-Down
ADC OUTPUT
0
B
IN
COUNT
300
250
200
150
100
50
6139
6141
4274AC G17
6143 6145
6147
V
SENSE
– V
EE
= 110.4mV
CURRENT SENSE RESISTOR INPUT VOLTAGE (mV)
0
ADC INTEGRAL NONLINEARITY (LSBs)
0
0.5
400
4274AC G18
–0.5
–1.0
100
200
250
500
1.0
300
50
150
450
350
ADC OUTPUT
260
0
B
IN
COUNT
600
500
400
300
200
100
262261
263
4274AC G19
264 265
AGND – V
OUT
= 48.3V
PORT VOLTAGE (V)
0
ADC INTEGRAL NONLINEARITY (LSBs)
0
0.5
50
4274AC G20
–0.5
–1.0
20
30
60
1.0
40
10
ADC OUTPUT
8532
0
B
IN
COUNT
600
500
400
300
200
100
85348533
8535
4274AC G21
8536
AGND – V
OUT
= 48.3V
PORT VOLTAGE (V)
0
ADC INTEGRAL NONLINEARITY (LSBs)
0
0.5
50
4274AC G22
–0.5
–1.0
20
30
60
1.0
40
10
LOAD CURRENT (mA)
0
0
PULL-DOWN VOLTAGE (V)
3
2.5
2
1.5
1
0.5
105
15
4274AC G23
20 25 30 35
40
100µs/DIV
GND
0mA
4274AC G24
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
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

LTC4274AIUHF-3#TRPBF

Mfr. #:
Buy LTC4274AIUHF-3#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Power Switch ICs - POE / LAN LTPoE++ 70W Single PSE Controller
Lifecycle:
New from this manufacturer.
Delivery:
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