LTC4267 datasheet(6/32 Pages) LINER

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LTC4270/LTC4271

42701fb

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

XIO

VOLX

XIO Digital Output Low

VXIOn – VEE, IXIOn = 5mA

0.7

VOHX

XIO Digital Output High

VXIOn – VEE, IXIOn = 100µA

3.5

XIO Digital Input Low Voltage

VXIOn – VEE

0.8

XIO Digital Input High Voltage

VXIOn – VEE

3.4

Internal Pull Up to CAP2

XIO0, XIO1

kΩ

PSE Timing Characteristics

tDET

Detection Time

Beginning To End of Detection (Note 7)

220

tCLE

Class Event Duration

(Note 7)

tCLEON

Class Event Turn On Duration

CPORT = 0.6µF (Note 7)

0.1

tME

Mark Event Duration

(Note 7, Note 11)

8.6

tMEL

Last Mark Event Duration

(Note 7, Note 11)

tPON

Power On Delay in AUTO Pin Mode From End of Valid Detect to Application of Power to Port

(Note 7)

Turn-On Rise Time

(AGND – VOUT): 10% to 90% of (AGND - VEE) CPORT =

0.15µF (Note 7)

µs

Turn-On Ramp Rate

CPORT = 0.15µF (Note 7)

V/µs

tTOCL

Turn-On Class Transition

CPORT = 0.15µF (Note 7)

0.1

tED

Fault Delay

From ICUT or ILIM Fault to Next Detect

(Note 7)

1.0

1.1

Midspan Mode Detection Backoff

RPORT = 15.5kΩ (Note 7)

2.3

2.5

2.7

Power Removal Detection Delay

From Power Removal After tDIS to Next Detect (Note 7)

1.0

1.3

2.5

tSTART

Maximum Current Limit Duration

During Port Start-Up

(Note 7)

tCUT

Maximum Overcurrent Duration

After Port Start-Up

(Note 7)

Maximum Overcurrent Duty Cycle (Note 7)

5.8

6.3

6.7

tLIM

Maximum Current Limit Duration

After Port Start-Up – tLIM Enabled

tLIM = 1 (Note 7, Note 12)

Maximum Current Limit Duration

After Port Start-Up – tLIM as tCUT

tLIM = 0 (Note 7, Note 12)

tMPS

Maintain Power Signature (MPS)

Pulse Width Sensitivity

Current Pulse Width to Reset Disconnect Timer (Note 7,

Note 8)

1.6

3.6

tDIS

Maintain Power Signature (MPS)

Dropout Time

(Note 7, Note 5)

320

350

380

tMSD

Masked Shut Down Delay

(Note 7)

6.5

µs

I2C Watchdog Timer Duration

(Note 7)

1.5

Minimum Pulse Width for Masked

Shut Down

(Note 7)

µs

Minimum Pulse Width for RESET

(Note 7)

4.5

µs

electricAl chArActeristics The

denotes the specifications which apply over the full operating

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

(Notes 3 & 4)

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