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LTC2923IMS Datasheet(PDF) 10 Page - Linear Technology |
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LTC2923IMS Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  LTC2923 10 2923fa APPLICATIO S I FOR ATIO Shutdown Output In some applications it might be necessary to control the shutdown or RUN/SS pins of the slave supplies using the 12-lead LTC2923CDE or LTC2923IDE. The LTC2923 may not be able to supply the rated 1mA of current from the FB1 and FB2 pins when VCC is below 2.9V. If the slave power supplies are capable of operating at low input voltages, use the open-drain SDO output to drive the SHDN or RUN/SS pins of the slave supplies (see Figure 7). This will hold the slave supplies’ outputs low until the ON pin is above 1.23V, VCC is above the 2.6V undervoltage lockout condition and there are no short-circuit faults latched. It pulls low again when the ON pin is pulled below 1.23V and the RAMP pin is below about 100mV. When two supplies must have their RUN/SS or SHDN pins controlled indepen- dently, tie a Schottky diode between each pin and the SDO output (see Figure 8). Status Output The STATUS pin provides an indication that the supplies are finished ramping up. This pin is an open-drain output that pulls low until the GATE has been fully charged. Since the GATE pin drives the gate of the external FET, or the RAMP pin directly when no FET is used, the supplies are completely ramped up when the GATE pin is fully charged. It will go low again when the GATE pin is pulled low, either because of a short-circuit fault or because the ON pin has been pulled low. Q1 CGATE 10nF 0.1µF 10Ω RSTATUS 10k VCC VIN VIN VIN RONB 138k VIN 3.3V RTB1 16.5k RTB2 887k RFA1 35.7k 1.8V 3.3V RFB1 16.5k RTA2 412k RTA1 13k RONA 100k RAMPBUF TRACK1 TRACK2 FB1 GATE LTC2923 GND 2923 F07 RAMP RFA2 412k 2.5V RFB2 887k DC/DC IN FB = 1.235V OUT DC/DC IN FB = 0.8V RUN/SS RUN/SS OUT FB2 SDO STATUS ON Q1 CGATE 10nF RSTATUS 10k VCC VIN VIN VIN RONB 138k VIN 3.3V RTB1 16.5k RTB2 887k RFA1 35.7k 1.8V 3.3V RFB1 16.5k RTA2 412k RTA1 13k RONA 100k RAMPBUF TRACK1 TRACK2 FB1 GATE LTC2923 GND 2923 F08 RAMP RFA2 412k 2.5V RFB2 887k DC/DC IN FB = 1.235V OUT DC/DC IN FB = 0.8V RUN/SS RUN/SS OUT FB2 SDO STATUS ON 0.1µF 10Ω Figure 7 Figure 8 |
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