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TPS76430DBVT Datasheet(PDF) 10 Page - Texas Instruments |
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TPS76430DBVT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 18 page TPS76425, TPS76427, TPS76428, TPS76430, TPS76433 LOW-POWER LOW-NOISE 150-mA LOW-DROPOUT LINEAR REGULATORS SLVS180B – MARCH 1999 – REVISED MAY 2001 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION The TPS764xx family of low-noise and low-dropout (LDO) regulators are optimized for use in battery-operated equipment. They feature extremely low noise (50 µV), low dropout voltages, low quiescent current (140 µA), and an enable input to reduce supply current to less than 2 µA when the regulator is turned off. device operation The TPS764xx 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 which, unlike a PNP transistor, does not require increased drive current as output current increases. Supply current in the TPS764xx 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 1 A; 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 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 diode that safely conducts reverse current when the input voltage level drops below the output voltage level. An internal resistor, in conjunction with external 0.01- µF bypass capacitor, creates a low-pass filter to further reduce the noise. The TPS764xx exhibits only 50 µV of output voltage noise using 0.01 µF bypass and 4.7-µF output capacitors. A logic low on the enable input, EN, shuts off the output and reduces the supply current to less than 2 µA. EN should be tied high in applications where the shutdown feature is not used. A typical application circuit is shown in Figure 19. C1 1 µF † TPS76425, TPS76427 TPS76430, TPS76433. BYPASS OUT 1 3 IN EN GND 2 4 5 VI CSR = 1 Ω VO 4.7 µF + TPS764xx† 0.01 µF + Figure 19. Typical Application Circuit |
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