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TPS79733-EP Datasheet(PDF) 9 Page - Texas Instruments |
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TPS79733-EP Datasheet(HTML) 9 Page - Texas Instruments |
9 / 16 page www.ti.com TPS79718 VIN VOUT PG GND 0.47 µF 1.8 V VCC RESET MSP430 or Equivalent VSS 0.1 µF + − TPS79718-EP, TPS79730-EP, TPS79733-EP SGLS348A – AUGUST 2006 – REVISED OCTOBER 2007 Regulator Protection The TPS797xx PMOS-pass transistor has a built-in back diode that conducts reverse current when the input voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting might be appropriate. The TPS797xx features internal current limiting. During normal operation, the TPS797xx limits output current to approximately 190 mA. When current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. Take care not to exceed the power dissipation ratings of the package. Microcontroller Application One application for which this device is particularly suited is providing a regulated input voltage and power good (PG) supervisory signal to low-power devices such as mixed-signal microcontrollers. The quiescent or ground current of the TPS797xx family is typically 1.2 µA even at full load; therefore, the reduction in battery life by including the TPS797xx in the system is negligible. The primary benefits of using the TPS797xx to power low power digital devices include: • Regulated output voltage that protects the device from battery droop and noise on the line (e.g., switch bounce) • Smooth, monotonic power up • PG signal for controlled device RESET • Potential to use an existing 5-V power rail to power a 3.3 V or lower device • Potential to provide separate digital and analog power and ground supplies for a system with only one power source Figure 15 shows an application in which the TPS79718 is used to power Texas Instruments MSP430 mixed signal microcontroller. Figure 15. MSP430 Microcontroller Powered by the TPS79718 Regulator Minimal board space is needed to accommodate the DCK (SC70/SOT-323) packaged TPS79718, the 0.1 µF output capacitor, the 0.47 µF input capacitor, and the pullup resistor on the PG pin. Copyright © 2006–2007, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): TPS79718-EP TPS79730-EP TPS79733-EP |
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