LTC4266 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC4266

Quad IEEE 802.3at Power over Ethernet Controller

Linear Technology 

TYPICAL PERFORMANCE CHARACTERISTICS

LTC4266

ADC Noise Histogram

Current Readback in Slow Mode

300

VSENSEn – VEE = 110.4mV

250

200

ADC Integral Nonlinearity

Current Readback in Slow Mode

1.0

0.5

ADC Noise Histogram Port

Voltage Readback in Fast Mode

600

AGND – VOUTn = 48.3V

500

400

150

0

300

100

200

–0.5

50

100

0

6139 6141 6143 6145 6147

ADC OUTPUT

4266 G17

–1.0

0 50 100 150 200 250 300 350 400 450 500

CURRENT SENSE RESISTOR INPUT VOLTAGE (mV)

4266 G18

0

260

261 262 263 264

ADC OUTPUT

265

4266 G19

ADC Integral Nonlinearity

Voltage Readback in Fast Mode

1.0

0.5

ADC Noise Histogram Port

Voltage Readback in Slow Mode

600

AGND – VOUTn = 48.3V

500

400

ADC Integral Nonlinearity

Voltage Readback in Slow Mode

1.0

0.5

0

300

0

200

–0.5

–0.5

100

–1.0

0

10 20 30 40 50 60

PORT VOLTAGE (V)

4266 G20

0

8532

8533 8534 8535

ADC OUTPUT

8536

4266 G21

–1.0

0

10 20 30 40 50 60

PORT VOLTAGE (V)

4266 G22

INT and SDAOUT Pull Down Voltage

vs Load Current

3

2.5

2

1.5

1

0.5

0

0 5 10 15 20 25 30 35 40

LOAD CURRENT (mA)

4266 G23

MOSFET Gate Drive With Fast

Pull Down

GND

PORT

VOLTAGE

20V/DIV

VDD = 3.3V

VEE = –54V

VEE

GATE

VOLTAGE

10V/DIV VEE

50Ω

FAULT

PORT

APPLIED

CURRENT

500mA/DIV 0mA

FAST PULL DOWN

CURRENT LIMIT

50Ω FAULT REMOVED

100µs/DIV

4266 G24

4266fb

9

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