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LTM8021EV-PBF Datasheet(PDF) 10 Page - Linear Technology |
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LTM8021EV-PBF Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page LTM8021 10 8021fb APPLICATIONS INFORMATION Figure 2. To Soft-Start the LTM8021, Add a Resisitor and Capacitor to the RUN/SS Pin Soft-Start The RUN/SS pin can be used to soft-start the LTM8021, reducing the maximum input current during start-up. The RUN/SS pin is driven through an external RC filter to create a voltage ramp at this pin. Figure 2 shows the soft-start circuit. By choosing a large RC time constant, the peak start-up current can be reduced to the current that is required to regulate the output, with no overshoot. Choose the value of the resistor so that it can supply 80μA when the RUN/SS pin reaches 2V. Figure 3. The Input Diode Prevents a Shorted Input from Discharging a Backup Battery Tied to the Output. It Also Protects the Circuit from a Reversed Input. The LTM8021 Runs Only When the Input is Present VOUT VIN RUN/SS BIAS GND LTM8021 8021 F03 VOUT RADJ COUT RT VIN 4V TO 36V CIN Shorted Input Protection Care needs to be taken in systems where the output will be held high when the input to the LTM8021 is absent. This may occur in battery charging applications or in battery backup systems where a battery or some other supply is diode ORed with the LTM8021’s output. If the VIN pin is allowed to float and the RUN/SS pin is held high (either by a logic signal or because it is tied to VIN), then the LTM8021’s internal circuitry will pull its quiescent current through its internal power switch. This is fine if your system can tolerate a few milliamps in this state. If the RUN/SS pin is grounded, the internal power switch current will drop to essentially zero. However, if the VIN pin is grounded while the output is held high, then parasitic diodes inside the LTM8021 can pull large currents from the output through the internal power switch and the VIN pin. Figure 3 shows a circuit that will run only when the input voltage is present and that protects against a shorted or reversed input. 8021 F02 RUN/SS GND 0.22μF RUN 15k |
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