LTC4263 datasheet(5/28 Pages) LINER

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LTC4274

4274fa

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Timing Characteristics

tDET

Detection Time

Beginning to End of Detection (Note 7)

270

290

310

tDETDLY

Detection Delay

From PD Connected to Port to Detection

Complete (Note 7)

300

470

tCLE1

First Class Event Duration

(Note 7)

tME1

First Mark Event Duration

(Notes 7, 11)

6.8

8.6

10.3

tCLE2

Second Class Event Duration

(Note 7)

tME2

Second Mark Event Duration

(Note 7)

tCLE3

Third Class Event Duration

CPORT = 0.6μF (Note 7)

0.1

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

Fault Delay

From ICUT Fault to Next Detect

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

tSTART1 = 0, tSTART0 = 0 (Notes 7, 12)

62.5

tLIM, tICUT

Maximum Current Limit Duration After Port

Start-Up

tICUT1 = 0, tICUT0 = 0 (Notes 7, 12)

62.5

Maximum Current Limit Duty Cycle

(Note 7)

5.8

6.3

6.7

tMPS

Maintain Power Signature (MPS) Pulse Width

Sensitivity

Current Pulse Width to Reset Disconnect

Timer (Notes 7, 8)

1.6

3.6

tDIS

Maintain Power Signature (MPS) Dropout

Time

tconf [1:0] = 00b (Notes 5, 12)

320

350

380

tMSD

Masked Shut Down Delay

(Note 7)

6.5

μs

tSHDN

Port Shut Down Delay

(Note 7)

6.5

μs

I2C Watchdog Timer Duration

1.5

Minimum Pulse Width for Masked Shut

Down

(Note 7)

3μs

Minimum Pulse Width for SHDN

(Note 7)

3μs

Minimum Pulse Width for RESET

(Note 7)

4.5

μs

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating

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

otherwise noted. (Notes 3, 4)

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