LTC2953I Ver la hoja de datos (PDF) - Linear Technology
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LTC2953I Datasheet PDF : 20 Pages
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LTC2953
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 2.7V to 27V, unless otherwise noted (Note 2).
SYMBOL
IPFI(LKG)
IPFO(LKG)
IUVLO(LKG)
IVM(LKG)
IRST(LKG)
tPFI
tRST
tuv
PARAMETER
⎯P⎯F⎯I Leakage Current
⎯P⎯FO Leakage Current
UVLO Leakage Current
VM Input Leakage Current
⎯R⎯S⎯T Output Leakage Current
⎯P⎯F⎯I Delay to ⎯P⎯F⎯O
Reset Timeout Period
VM Under Voltage Detect to ⎯R⎯S⎯T
CONDITIONS
VPFI = 0.5V
VPFI = 27V
VPFO = 1V
VPFO = 40V
VUVLO = 0.5V
VUVLO = 27V
VM = 0.5V
VRST = 3V
VM Less Than VM(TH) By More Than 1%
MIN TYP MAX UNITS
●
2
±10
nA
±1
μA
●
2
±10
nA
±1
μA
●
2
±10
nA
±1
μA
●
2
±10
nA
●
±0.1
μA
● 40
100
200
μs
● 140
200
260
ms
250
μs
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 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.
Note 4: To manually force a release of the EN/⎯E⎯N pin, either ⎯P⎯B or UVLO
must be held low for at least tPD, Min (internal default power down timer) +
tPDT (adjustable by placing external capacitor at PDT pin).
Note 5: The ⎯K⎯I⎯L⎯L turn on blanking timer period (tKILL, ON BLANK) is the
waiting period immediately after 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, ⎯P⎯B and UVLO inputs are ignored during this
period. If ⎯K⎯I⎯L⎯L remains low at the end of this blanking period, the enable
output is released, thus turning off system power.
2953f
4
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