LTC2952CF datasheet(5/28 Pages) LINER

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LTC2952

2952f

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The greatest of V1, V2 or VS is the internal supply voltage (VMAX).

Note 3: All currents into pins are positive; all voltages are referenced to

GND unless otherwise noted.

Note 4: V2PREF_TH is the minimum voltage level at which V2 becomes the

preferential source of quiescent current when both of the ideal diodes are

off.

Note 5: VS is stepped from (V1 or V2) + 0.2V to (V1 or V2) – 0.2V to

trigger the event. The gate voltages are initially VG(OFF).

Note 6: VS is stepped from VX – 0.2V to VX + 0.2V to trigger the event.

Gate voltages are initially clamped at VG(ON).

Note 7: The Adjustable Turn-On and Turn-Off timer period is the adjustable

debounce period following the Internal Default-On and Default-Off timer

period respectively.

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

temperature range, otherwise speciﬁcations are at TA = 25°C. V1 = V2 = VS = 2.7V to 28V unless otherwise noted. (Notes 2, 3)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

µP Handshake Timing

t⎯IN⎯T(MIN)

⎯I⎯N⎯T Minimum Pulse Width

Minimum Measured Time

⎯P⎯B Rising to

⎯I⎯N⎯T Rising

●

250

µs

t⎯K⎯I⎯L⎯L(PW)

⎯K⎯I⎯L⎯L Minimum Pulse Width

Full Swing Pulse From 5V to 0V

●

150

500

µs

t⎯K⎯I⎯L⎯L,ON BLANK

⎯K⎯I⎯L⎯L ON Blanking (Note 9)

⎯K⎯I⎯L⎯L = 0V, Measured Time Between EN Rising

→ EN Falling

●

270

400

530

t⎯K⎯I⎯L⎯L, OFF WAIT

⎯K⎯I⎯L⎯L Wait Time (Note 10)

⎯K⎯I⎯L⎯L = 1V, C

OFFT = OPEN, Measured Time

Between

⎯I⎯N⎯T Falling → EN Falling

●

270

400

530

tEN, LOCKOUT

Enable Lockout Time (Note 11)

Measured Time Between EN Falling

→ EN

Rising

●

270

400

530

Note 8: The input current to the three-state WDE pin are the pull-up

and the pull-down current when the pin is either set to 3.3V or GND

respectively. In the Open state, the maximum pull-up or pull-down leakage

current permissible is 10µA.

Note 9: The Turn-On

⎯K⎯I⎯L⎯L Blanking Time is the waiting period immediately

following the EN pin switching high; at the end of this period the input

to the

⎯K⎯I⎯L⎯L needs to be high to indicate that the system has powered up

properly, otherwise the EN pin is immediately switched low.

Note 10: The

⎯K⎯I⎯L⎯L Wait Time during the power down process is the wait

period immediately following a valid turn-off command until the EN pin

switches low.

Note 11: The Enable Lockout Time is the minimum wait time between the

last falling edge and the next rising edge on the EN pin.

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