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TPS76915 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS76915 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 16 page TPS76901, TPS76912, TPS76915, TPS76918, TPS76925 TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS SLVS203D – JUNE 1999 – REVISED APRIL 2000 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION The TPS769xx family of low-dropout (LDO) regulators have been optimized for use in battery-operated equipment. They feature extremely low dropout voltages, low quiescent current (17 µA nominally), and enable inputs to reduce supply currents to 1 µA when the regulators are turned off. device operation The TPS769xx uses a PMOS pass element to dramatically reduce both dropout voltage and supply current over more conventional PNP-pass-element LDO designs. The PMOS pass element is a voltage-controlled device and, unlike a PNP transistor, it does not require increased drive current as output current increases. Supply current in the TPS769xx is essentially constant from no load to maximum load. Current limiting and thermal protection prevent damage by excessive output current and/or power dissipation. The device switches into a constant-current mode at approximately 350 mA; further load reduces the output voltage instead of increasing the output current. The thermal protection shuts the regulator off if the junction temperature rises above approximately 165 °C. Recovery is automatic when the junction temperature drops approximately 25 °C below the high temperature trip point. The PMOS pass element includes a back gate diode that conducts reverse current when the input voltage level drops below the output voltage level. A voltage of 1.7 V or greater on the EN input will disable the TPS769xx internal circuitry, reducing the supply current to 1 µA. A voltage of less than 0.9 V on the EN input will enable the TPS769xx and will enable normal operation to resume. The EN input does not include any deliberate hysteresis, and it exhibits an actual switching threshold of approximately 1.5 V. A typical application circuit is shown in Figure 21. C1 1 µF † TPS76912, TPS76915, TPS76918, TPS76925, TPS76927, TPS76928, TPS76930, TPS76933, TPS76950 (fixed-voltage options). NC/FB OUT 1 3 IN EN GND 2 4 5 VI ESR = 0.2 Ω VO 4.7 µF + TPS769xx† Figure 21. Typical Application Circuit |
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