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LTC2950CDDB-2-TRPBF Datasheet(PDF) 3 Page - Linear Technology |
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LTC2950CDDB-2-TRPBF Datasheet(HTML) 3 Page - Linear Technology |
3 / 16 page LTC2950-1/LTC2950-2 3 295012fb The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 2.7V to 26.4V, unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Supply Voltage Range Steady State Operation ● 2.7 26.4 V IIN VIN Supply Current System Power On, VIN = 2.7V to 24V ● 612 μA VUVL VIN Undervoltage Lockout VIN Falling ● 2.2 2.3 2.4 V VUVL(HYST) VIN Undervoltage Lockout Hysteresis 50 300 600 mV Push Button Pin (PB) VPB(MIN, MAX) PB Voltage Range Single-Ended ● –1 26.4 V IPB PB Input Current 2.5V < VPB < 26.4V VPB = 1V VPB = 0.6V ● ● ● –1 –3 –6 –9 ±1 –12 –15 μA μA μA VPB(VTH) PB Input Threshold PB Falling ● 0.6 0.8 1 V VPB(VOC) PB Open Circuit Voltage IPB = –1μA 1 1.6 2 V Debounce Timing Pins (ONT, OFFT) IONT, OFFT(PU) ONT/OFFT Pull Up Current VONT, OFFT = 0V ● –2.4 –3 –3.6 μA IONT, OFFT(PD) ONT/OFFT Pull Down Current VONT, OFFT = 1.3V ● 2.4 3 3.6 μA tDB, On Internal Turn On Debounce Time ONT Pin Float, PB Falling → Enable Asserted ● 26 32 41 ms tONT Additional Adjustable Turn On Time CONT = 1500pF ● 9 11.5 13.5 ms tDB, Off Internal Turn Off Debounce Time OFFT Pin Float, PB Falling → INT Falling ● 26 32 41 ms tOFFT Additional Adjustable Turn Off Time COFFT = 1500pF ● 9 11.5 13.5 ms μP Handshake Pins (INT, KILL) IINT(LKG) INT Leakage Current VINT = 3V ● ±1 μA VINT(VOL) INT Output Voltage Low IINT = 3mA ● 0.11 0.4 V VKILL(TH) KILL Input Threshold Voltage KILL Falling ● 0.57 0.6 0.63 V VKILL(HYST) KILL Input Threshold Hysteresis 10 30 50 mV IKILL(LKG) KILL Leakage Current VKILL = 0.6V ±0.1 μA tKILL(PW) KILL Minimum Pulse Width ● 30 μs tKILL(PD) KILL Propagation Delay KILL Falling → Enable Released ● 30 μs tKILL, On Blank KILL Turn On Blanking (Note 3) KILL = Low, Enable Asserted → Enable Released ● 400 512 650 ms tKILL, Off Delay KILL Turn Off Delay (Note 4) KILL = High, INT Asserted → Enable Released ● 800 1024 1300 ms tEN/EN, Lock Out EN/EN Lock Out Time (Note 5) Enable Released → Enable Asserted ● 200 256 325 ms IEN/EN(LKG) EN/EN Leakage Current VEN/EN = 1V, Sink Current Off ● ±0.1 μA VEN/EN(VOL) EN/EN Voltage Output Low IEN/EN = 3mA ● 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 system power. This time delay does not include tDB, ON or tONT. 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 1024ms. This time delay does not include tDB, OFF or tOFFT. 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 time. This time delay does not include tDB, ON or tONT. |
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