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LTC2927CDDB Datasheet(PDF) 4 Page - Linear Technology |
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LTC2927CDDB Datasheet(HTML) 4 Page - Linear Technology |
4 / 16 page LTC2927 4 2927fb PIN FUNCTIONS VCC (V) 0 0.0 0.2 0.4 0.6 0.8 1.0 1234 2927 G0 5 ISDO = 5mA ISDO = 10μA 2.5 3.0 3.5 4.0 4.5 6.0 5.5 5.0 VCC (V) 10 20 30 40 50 60 2927 G07 VTRACK = 0V ITRACK (mA) 1 0 1 2 3 4 5 234 2927 G0 5 ERROR = • VTRACK 0.8V –1 IFB ITRACK Tracking Cell Error vs ITRACK VSDO(OL) vs VCC VCC (Pin 1/Pin 8): Supply Voltage Input. Operating range is from 2.9V to 5.5V. An undervoltage lockout asserts SDO until VCC > 2.5V. VCC should be bypassed to GND with a 0.1μF capacitor. SDO (Pin 2/Pin 7): Slave Supply Shutdown Output. SDO is an open-drain output that holds the shutdown (RUN/SS) pin of the slave supply low until the VCC pin is pulled above 2.5V, and the ON pin is pulled above 1.23V, or RAMP is above 200mV. SDO is pulled low again when both RAMP < 200mV and ON < 1.23V. If the slave supply is capable of operating with an input supply that is lower than the LTC2927’s minimum operating voltage of 2.9V, the SDO pin can be used to hold off the slave supply. Tie the SDO pin to GND if unused. FB (Pin 3/Pin 6): Feedback Control Output. FB pulls up on the feedback node of the slave supply. Tracking is achieved by mirroring the current from TRACK into FB. A resistive divider connecting RAMPBUF and TRACK will force the output voltage of the slave supply to track RAMP. To prevent damage to the slave supply, the FB pin will not force the slave’s feedback node above 2.3V. In addition, the LTC2927 will not actively sink current from this node, even when it is unpowered. TSOT/DFN Packages MAX ITRACK vs VCC TYPICAL PERFOR A CE CHARACTERISTICS TEMPERATURE (°C) –50 10 18 16 14 12 20 22 24 26 28 –25 0 25 50 2927 G05 75 100 TEMPERATURE (°C) –50 1.210 1.215 1.220 1.225 1.230 1.235 1.240 –25 0 25 50 2927 G04 75 100 TEMPERATURE (°C) –50 40 45 50 55 60 65 70 –25 0 25 50 2927 G06 75 100 VRAMPBUF(OL) vs Temperature VRAMPBUF(OH) vs Temperature VON(TH) vs Temperature |
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