TPS78833DBVR

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1. Describe

TPS78825 and TPS78833 are very small (SOT-23) Package, low noise LDO, adjustable output Voltage is 2.5V and 3.3V, input voltage range The absolute maximum is 2.7 V to 13.5 V. These The device outputs 150 mA with a peak current of 350 mA (typical). TPS788xx series use SR pin for programming Slew rate of output voltage to control surge current. This is specifically for USB applications There is a place with a large load capacitance when starting. This TPS788xx devices use only 17 µA of quiescent current And only use 56 µVRMS of output voltage noise 10 µF output capacitor. The usual PNP pass transistor has been replaced with PMOS pass element. Because the PMOS pass element Appears as a low-value resistance, and the pressure difference is Very low, typically 150 mV at 150 mA load current, and It is proportional to the load current. TPS788xx also has sleep enable logic Mode turns off the regulator to reduce static electricity At TJ = 25°C, the current is 1 µA (typical).

2. Feature

    1. 150mA Low-Dropout Regulator

    2. Provide 2.5V, 3.3V voltage

    3. Programmable slew rate control

    4. The output noise is usually 56 µVRMS

    5. Only 17 µA quiescent current at 150 mA

    6. The quiescent current in standby mode is 1 µA

    7. The differential pressure at 150 mA is usually 150 mV (TPS78833)

    8. Overcurrent limit

    9. –40°C to 125°C operating junction temperature range

  10. 5-pin SOT-23 (DBV) package

3. Pin configuration

4. Pin description

5. External capacitor requirements

Although not required, a 0.047 µF or larger ceramic input bypass capacitor connected between IN and GND And close to TPS788xx, it is recommended to improve transient response and noise suppression. One If large, fast rise time load transients are expected, a higher value electrolytic input capacitor may be required And the device is a few inches away from the power source. Like all low dropout regulators, TPS788xx requires an output capacitor connected between OUT and GND To stabilize the internal control loop. The minimum recommended capacitance is 4.7 µF. ESR (equivalent The series resistance of the capacitor) should be between 0.2 Ω and 10 Ω. To ensure stability. Larger capacitance values less than 4.7 µF are acceptable and allow the use of smaller ESR values. Capacitors less than 4.7 µF are not recommended because they require careful selection of ESR to ensure stability. Solid tantalum electrolytic, aluminum electrolytic capacitors and multilayer ceramic capacitors are all suitable. Most commercially available 4.7 µF surface mount solid tantalum capacitors, including Sprague, Kemet, and Nichico devices, meet the above-mentioned ESR requirements. Multilayer ceramic capacitors may have a very small equivalent series resistance, so it may be necessary to add a low-value series resistance to ensure stability. External bypass capacitor, used together with internal resistance to form a low-pass filter, should be Low ESR ceramic capacitors. For example, the output voltage noise of TPS78833 is only 56 µVRMS, using a 0.01 µF ceramic bypass capacitor and a 10 µF ceramic output capacitor. Note that the output will start due to the RC time constant on the BYPASS pin which is determined by the internal 150kΩ resistor and the external capacitor.

6. Regulator protection

The TPS788xx PMOS pass transistor has a built-in reverse diode, when the input The voltage is lower than the output voltage. The current is conducted from the output to the input and is not limited internally. If extended reverse voltage operation is expected, external restrictions may be appropriate. TPS788xx has internal current limit and thermal protection functions. During normal operation, the TPS78833 limits the output current to approximately 350 mA. When the current limit is enabled, the output voltage will decrease linearly until the overcurrent condition ends. Although the current limit is designed to prevent serious equipment failure, care should be taken not to exceed the power dissipation rating of the package. If the device temperature exceeds approximately 165°C, the thermal protection circuit shuts it down. Once the equipment has cooled below approximately 140°C, the regulator operation resumes.