LTC2954

3

2954f

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS



PB Input Current

●

●

●

–1

–3

–6

–9

±1

–12

–15

µA

µA

µA



PB Input Threshold



PB Falling

●

0.6

0.8

1

V



PB Open Circuit Voltage

1

1.6

2

V

EN/EN Lock Out Time (Note 5)

Enable Released → Enable Asserted

●

200

256

325

ms

EN/EN Leakage Current

●

●

±0.1

±1

µA

µA

EN/EN Voltage Output Low

●

0.11

0.4

V

Power On Timing Pin (ONT)

ONT Pull Up Current

●

–2.4

–3

–3.6

µA

ONT Pull Down Current

●

2.4

3

3.6

µA

Internal Turn On Debounce Time

ONT Pin Float, PB Falling → Enable Asserted

●

26

32

41

ms

●

9

11.5

13.5

ms

Power Down Timing Pin (PDT)

PDT Pull Up Current

●

–2.4

–3

–3.6

µA

PDT Pull Down Current

●

2.4

3

3.6

µA

Turn Off Interrupt Debounce Time



PB Falling → INT Falling

●

26

32

41

ms

Internal PB Power Down

DebounceTime (Note 4)

PDT Pin Float, PB Falling → Enable Released

●

52

64

82

ms

Additional Adjustable PB Power

Down Debounce Time

●

9

11.5

13.5

ms

Minimum INT Pulse Width



INT Asserted → INT Released

●

26

32

41

ms

Maximum INT Pulse Width

●

35

43.5

54.5

ms

µP Handshake Pins (INT, KILL)



INT Leakage Current

●

±1

µA



INT Output Voltage Low

●

0.11

0.4

V



KILL Input Threshold Voltage



KILL Falling

●

0.57

0.6

0.63

V



KILL Input Threshold Hysteresis

●

10

30

50

mV



KILL Leakage Current

●

±0.1

µA



KILL Minimum Pulse Width

●

30

µs



KILL Propagation Delay



KILL Falling → Enable Released

●

30

µs



KILL Turn On Blanking (Note 3)



KILL = Low, Enable Asserted → Enable Released

●

400

512

650

ms

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: 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

Note 4: To manually force an immediate release of the EN/EN pin, the push

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

ELECTRICAL CHARACTERISTICS