LTC4411 datasheet(3/16 Pages) LINER

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LTC2951

2951f

The ● denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = 2.7V to 26.4V, unless otherwise noted. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Push Button Pin (⎯P⎯B)

V⎯P⎯B(MIN, MAX)

⎯P⎯B Voltage Range

Single-Ended

●

–1

26.4

I⎯P⎯B

⎯P⎯B Input Current

2.5V < V⎯P⎯B < 26.4V

V⎯P⎯B = 1V

V⎯P⎯B = 0.6V

●

–1

–3

–6

–9

±1

–12

–15

µA

V⎯P⎯B(VTH)

⎯P⎯B Input Threshold

⎯P⎯B Falling

●

0.6

0.8

V⎯P⎯B(VOC)

⎯P⎯B Open Circuit Voltage

I⎯P⎯B = –1µA

●

11.6

Timing Pins (KILLT, OFFT)

IKILLT, OFFT(PU)

KILLT/OFFT Pull Up Current

VKILLT, OFFT = 0V

●

–2.4

–3

–3.6

µA

IKILLT, OFFT(PD)

KILLT/OFFT Pull Down Current

VKILLT, OFFT = 1.3V

●

2.4

3.6

µA

tDB, ON

Turn On Debounce Time

⎯P⎯B Falling → Enable Asserted

●

100

128

163

tDB, OFF

Internal Turn Off Debounce Time

OFFT Pin Float, ⎯P⎯B Falling → ⎯I⎯N⎯T Falling

●

tOFFT

Additional Adjustable Turn Off Time COFFT = 1500pF

●

11.5

13.5

µP Handshake Pins (⎯I⎯N⎯T, ⎯K⎯I⎯L⎯L)

I⎯I⎯N⎯T(LKG)

⎯I⎯N⎯T Leakage Current

V⎯⎯⎯I⎯N⎯T = 3V

●

±1

µA

V⎯I⎯N⎯T(VOL)

⎯I⎯N⎯T Output Voltage Low

I⎯⎯⎯I⎯N⎯T = 3mA

●

0.11

0.4

V⎯K⎯I⎯L⎯L(TH)

⎯K⎯I⎯L⎯L Input Threshold Voltage

⎯K⎯I⎯L⎯L Falling

●

0.57

0.6

0.63

V⎯K⎯I⎯L⎯L(HYST)

⎯K⎯I⎯L⎯L Input Threshold Hysteresis

●

I⎯K⎯I⎯L⎯L(LKG)

⎯K⎯I⎯L⎯L Leakage Current

V⎯K⎯I⎯L⎯L = 0.6V

●

±0.1

µA

t⎯K⎯I⎯L⎯L(PW)

⎯K⎯I⎯L⎯L Minimum Pulse Width

●

µs

t⎯K⎯I⎯L⎯L(PD)

⎯K⎯I⎯L⎯L Propagation Delay

⎯K⎯I⎯L⎯L Falling → Enable Released

●

µs

t⎯K⎯I⎯L⎯L, ON BLANK

⎯K⎯I⎯L⎯L Turn On Blanking (Note 3)

⎯K⎯I⎯L⎯L = Low, Enable Asserted → Enable

Released

●

400

512

650

t⎯K⎯I⎯L⎯L, OFF DELAY

Internal ⎯K⎯I⎯L⎯L Turn Off Delay

(Note 4)

KILLT Pin Float, ⎯K⎯I⎯L⎯L = High, ⎯⎯I⎯⎯⎯N⎯⎯⎯T Asserted →

Enable Released

●

100

128

163

t⎯K⎯I⎯L⎯L, OFF DELAY,

ADDITIONAL

Additional Adjustable ⎯K⎯I⎯L⎯L Turn Off

Delay (Note 4)

CKILLT = 1500pF

●

11.5

13.5

tEN/⎯E⎯N, Lock Out

EN/⎯E⎯N Lock Out Time (Note 5)

Enable Released → Enable Asserted

●

200

256

325

IEN/⎯E⎯N(LKG)

EN/⎯E⎯N Leakage Current

VEN/⎯E⎯N = 1V, Sink Current Off

●

±0.1

µA

VEN/⎯E⎯N(VOL)

EN/⎯E⎯N Voltage Output Low

IEN/⎯E⎯N = 3mA

●

0.11

0.4

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: All currents into pins are positive; all voltages are referenced to

GND unless otherwise noted.

Note 3: The ⎯K⎯I⎯L⎯L turn on blanking timer period is the waiting period

immediately after the enable output is asserted. This blanking time allows

sufﬁcient time for the DC/DC converter and the µP to perform power up

tasks. The ⎯K⎯I⎯L⎯L and ⎯P⎯B inputs are ignored during this period. If ⎯K⎯I⎯L⎯L

remains low at the end of this time period, the enable output is released,

thus turning off system power. This time delay does not include tDB, ON.

Note 4: The internal ⎯K⎯I⎯L⎯L turn off delay (t⎯K⎯I⎯L⎯L, OFF DELAY) is the default

delay from the initiation of a power off sequence (⎯I⎯N⎯T falling, ⎯K⎯I⎯L⎯L = high),

to the release of the enable output. The additional, adjustable ⎯K⎯I⎯L⎯L turn

off delay (t⎯K⎯I⎯L⎯L, OFF DELAY, ADDITIONAL) uses an optional external capacitor

(CKILLT) to provide extra delay from ⎯I⎯N⎯T falling to the release of the enable

output. If the ⎯K⎯I⎯L⎯L input switches low at any time during ⎯K⎯I⎯L⎯L turn off

delay, enable is released, thus turning off system power.

Note 5: The enable lock out time is designed to allow an application to

properly power down such that the next power up sequence starts from a

consistent powered down conﬁguration. ⎯P⎯B is ignored during this lock out

time. This time delay does not include tDB, ON.

ELECTRICAL CHARACTERISTICS

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