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LTC2927 Datasheet(PDF) 5 Page - Linear Technology |
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LTC2927 Datasheet(HTML) 5 Page - Linear Technology |
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5 / 16 page  LTC2927 5 2927fb 0.8V – + 0.2V 10μA 10μA – + 5 RAMPBUF 5 RAMP 2927 BD 5 VCC 5 GND 5 SDO 5 FB 5 ON 5 TRACK 1.23V – + VCC 2.5V VCC UVLO VCC 1x FU CTIO AL BLOCK DIAGRA TSOT/DFN Packages PI FU CTIO S GND (Pin 4/Pin 5): Device Ground. TRACK (Pin 5/Pin 4): Tracking Control Input. A resistive voltage divider between RAMPBUF and TRACK determines the tracking profile of the slave supply. TRACK servos to 0.8V, and the current supplied at TRACK is mirrored at FB. The TRACK pin is capable of supplying at least 1mA when VCC = 2.9V. Under short circuit conditions, the TRACK pin is capable of supplying up to 70mA. Do not connect to GND for extended periods. Limit the capacitance at the TRACK pin to less than 25pF. RAMPBUF (Pin 6/Pin 3): Ramp Buffer Output. Provides a low impedance buffered version of the signal on the RAMP pin. This buffered output drives the resistive volt- age divider that connects to the TRACK pin. Limit the capacitance at the RAMPBUF pin to less than 100pF. Float RAMPBUF if unused. RAMP (Pin 7/Pin 2): Ramp Buffer Input. The RAMP pin is the input to the voltage buffer whose output drives a resis- tive voltage divider connected to the TRACK pin. Connect this input to a capacitor to set the ramp voltage generated from internal 10μA pull-up or pull-down currents. RAMP can also be connected to an external ramping signal for tracking. Ground RAMP if unused. ON (Pin 8/Pin 1): On Control Input. The voltage level of the ON pin relative to its 1.23V threshold (with 75mV hysteresis) controls the tracking direction of the LTC2927. An active high causes a 10μA pull-up current to flow at the RAMP pin, which charges an external capacitor. An active low at the ON pin causes a 10μA pull-down cur- rent at the RAMP pin to discharge the external capacitor relative to GND. Exposed Pad (NA/Pin 9): Exposed pad may be left open or connected to device ground. |
Similar Part No. - LTC2927_15 |
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Similar Description - LTC2927_15 |
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