LTC2950-1/LTC2950-2

3

295012fb

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage Range

Steady State Operation

●

2.7

26.4

V

●

612

μA

●

2.2

2.3

2.4

V

Hysteresis

50

300

600

mV

Push Button Pin (PB)

PB Voltage Range

Single-Ended

●

–1

26.4

V

PB Input Current

●

●

●

–1

–3

–6

–9

±1

–12

–15

μA

μA

μA

PB Input Threshold

PB Falling

●

0.6

0.8

1

V

PB Open Circuit Voltage

1

1.6

2

V

Debounce Timing Pins (ONT, OFFT)

ONT/OFFT Pull Up Current

●

–2.4

–3

–3.6

μA

ONT/OFFT Pull Down Current

●

2.4

3

3.6

μA

Internal Turn On Debounce Time

ONT Pin Float, PB Falling

→ Enable Asserted

●

26

32

41

ms

●

9

11.5

13.5

ms

Internal Turn Off Debounce Time

OFFT Pin Float, PB Falling

→ INT Falling

●

26

32

41

ms

●

9

11.5

13.5

ms

μP Handshake Pins (INT, KILL)

INT Leakage Current

●

±1

μA

INT Output Voltage Low

●

0.11

0.4

V

KILL Input Threshold Voltage

KILL Falling

●

0.57

0.6

0.63

V

KILL Input Threshold Hysteresis

10

30

50

mV

KILL Leakage Current

±0.1

μA

KILL Minimum Pulse Width

●

30

μs

KILL Propagation Delay

KILL Falling → Enable Released

●

30

μs

KILL Turn On Blanking (Note 3)

KILL = Low, Enable Asserted → Enable Released

●

400

512

650

ms

KILL Turn Off Delay (Note 4)

KILL = High, INT Asserted → Enable Released

●

800

1024

1300

ms

EN/EN Lock Out Time (Note 5)

Enable Released

→ Enable Asserted

●

200

256

325

ms

EN/EN Leakage Current

●

±0.1

μA

EN/EN Voltage Output Low

●

0.11

0.4

V

ELECTRICAL CHARACTERISTICS

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 KILL 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 KILL and PB inputs are ignored during this period. If KILL remains low

at the end of this time period, the enable output is released, thus turning off

Note 4: The KILL turn off delay is the maximum delay from the initiation

of a shutdown sequence (INT falling), to the release of the enable output.

If the KILL input switches low at any time during this period, enable is

released, thus turning off system power. This time is internally fixed at

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. PB is ignored during this lock out