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LP2985-15YEQR Datasheet(PDF) 11 Page - Texas Instruments |
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LP2985-15YEQR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 15 page LP2985LV 150mA LOW NOISE, LOW DROPOUT REGULATOR WITH SHUTDOWN FOR OUTPUT VOLTAGES <2.3 V SLVS552 − OCTOBER 2004 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION ON/OFF operation The LP2985LV allows for a shutdown mode via the ON/OFF pin. Driving the pin LOW ( ≤0.3 V) turns the device OFF, conversely, a HIGH ( ≥1.6 V) turns the device ON. If the shutdown feature is not used, the ON/OFF pin should be connected to the input to ensure that the regulator is on at all times. For proper operation, do not leave the ON/OFF pin unconnected and apply a signal with a slew rate of ≥40 mV/µs. reverse input-output voltage There is an inherent diode present across the PNP pass element of the LP2985LV. VOUT VIN With the anode connected to the output, this diode is reverse biased during normal operation since the input voltage is higher than the output. However, if the output is pulled higher than the input for any reason, this diode will be forward biased and can cause a parasitic silicon-controlled rectifier (SCR) to latch, resulting in high current flowing from the output to the input. Thus, to prevent possible damage to the regulator in any application where the output may be pulled above the input, an external Schottky diode must be connected between the output and input. With the anode on output, this Schottky limits the reverse voltage across the output and input pins to 0.3 V, preventing the regulator’s internal diode from forward biasing. VOUT VIN Schottky LP2985LV |
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