LTC4292 datasheet(3/40 Pages) AD

3 / 40 page

LTC4291-1/LTC4292

Rev 0

For more information www.analog.com

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LTC4291IUF-1#PBF

LTC4291IUF-1#TRPBF

42911

24-Lead (4mm × 4mm) Plastic QFN

–40°C to 85°C

LTC4292IUJ#PBF

LTC4292IUJ#TRPBF

LTC4292UJ

40-Lead (6mm × 6mm) Plastic QFN

–40°C to 85°C

Contact the factory for parts specified with wider operating temperature ranges.

Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. AGNDP – VEE = 54V and VDD – DGND = 3.3V unless otherwise noted.

(Notes 3 and 4)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Main PoE Supply Voltage

AGNDP – VEE

For IEEE Type 3 Compliant Output

For IEEE Type 4 Compliant Output

Undervoltage Lock-Out

AGNDP – VEE

VDD

VDD Supply Voltage

VDD – DGND

3.0

3.3

3.6

Undervoltage Lock-Out

VDD – DGND

2.7

VCAP1

Internal Regulator Supply Voltage

VCAP1 – DGND

1.84

VCAP2

Internal Regulator Supply Voltage

VCAP2 – VEE

4.3

IEE

VEE Supply Current

(AGNDP – VEE) = 55V

REE

VEE Supply Resistance

(AGNDP – VEE) < 15V

kΩ

IDD

VDD Supply Current

(VDD – DGND) = 3.3V

Detection/Connection Check

Forced Current

First Point, AGNDP – VOUTnM = 9V

Second Point, AGNDP – VOUTnM = 3.5V

220

143

240

160

260

180

µA

Forced Voltage

AGNDP – VOUTnM, 5µA ≤ IOUTnM ≤ 500µA

First Point

Second Point

Detection/Connection Check Current

Compliance

AGNDP – VOUTnM = 0V

0.8

0.9

VOC

Detection/Connection Check Voltage

Compliance

AGNDP – VOUTnM, Open Port

10.4

Detection/Connection Check Voltage

Slew Rate

AGNDP – VOUTnM, CPORT = 0.15µF (Note 7)

0.01

V/µs

Min. Valid Signature Resistance

15.5

18.5

kΩ

Max. Valid Signature Resistance

27.5

29.7

kΩ

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