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TPS76033DBVTG4 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS76033DBVTG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 16 page TPS76030, TPS76032, TPS76033, TPS76038, TPS76050 LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS SLVS144D – JULY 1998 – REVISED MAY 2001 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION 1 3 5 TPS760xx IN EN OUT 2 CI = 1 µF Co = 2.2 µF GND Figure 17. TPS760xx Typical Application over current protection The over current protection circuit forces the TPS760xx into a constant current output mode when the load is excessive or the output is shorted to ground. Normal operation resumes when the fault condition is removed. An overload or short circuit may also activate the over temperature protection if the fault condition persists. over temperature protection The thermal protection system shuts the TPS760xx down when the junction temperature exceeds 160 °C. The device recovers and operates normally when the temperature drops below 155 °C. input capacitor A 0.047 µF or larger ceramic decoupling capacitor with short leads connected between IN and GND is recommended. The decoupling capacitor may be omitted if there is a 1 µF or larger electrolytic capacitor connected between IN and GND and located reasonably close to the TPS760xx. However, the small ceramic device is desirable even when the larger capacitor is present, if there is a lot of high frequency noise present in the system. output capacitor Like all low dropout regulators, the TPS760xx requires an output capacitor connected between OUT and GND to stabilize the internal control loop. The minimum recommended capacitance value is 2.2 µF and the ESR (equivalent series resistance) must be between 0.1 Ω and 20 Ω. Capacitor values of 2.5-µF or larger are acceptable, provided the ESR is less than 20 Ω. Solid tantalum electrolytic, aluminum electrolytic, and multilayer ceramic capacitors are all suitable, provided they meet the requirements described above. Most of the commercially available 2.2- µF surface-mount solid-tantalum capacitors, including devices from Sprague, Kemet, and Nichicon, meet the ESR requirements stated above. Multilayer ceramic capacitors should have minimum values of 2.5 µF over the full operating temperature range of the equipment. enable (EN) A logic zero on the enable input shuts the TPS760xx off and reduces the supply current to less than 1 µA. Pulling the enable input high causes normal operation to resume. If the enable feature is not used, EN should be connected to IN to keep the regulator on all of the time. The EN input must not be left floating. reverse current path The power transistor used in the TPS760xx has an inherent diode connected between IN and OUT as shown in the functional block diagram. This diode conducts current from the OUT terminal to the IN terminal whenever IN is lower than OUT by a diode drop. This condition does not damage the TPS760xx, provided the current is limited to 100 mA. |
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