TPS7A1901DRBR IC

TPS7A1901DRBR Description

The TPS7A19 is a low-dropout linear regulator with a large input voltage range (VIN) of up to 40 V and a maximum output current (IOUT) of 450 mA. (LDO). This voltage regulator is the best choice for converting many input voltage rails into a low-voltage supply. A simple surge protection circuit, the TPS7A19, provides a well-regulated voltage rail and keeps regulation even when there are voltage transients.

The TPS7A19 is perfect for always-on or battery-powered applications because it uses just 15 A of quiescent current (IQ) at light loads. Thermal shutdown and overcurrent protection are integrated into the TPS7A19. The power good output (PG), which indicates that the output voltage is within specification, on the TPS7A19 has a delay that can be adjusted. This function is very useful for power-rail sequencing. This LDO is placed in a small, 8-pin SON package that is 3 mm by 3 mm in size and thermally enhanced.

TPS7A1901DRBR Features

● 4 to 40 volts is a large input voltage range.

● 1.5 V to 18 V of adjustable output voltage.

● Current output: 450 mA.

● 15 A is a low quiescent current (IQ).

● Low Dropout Voltage @ 400 mA: 450 mV (max).

● With the programmable delay, power supply.

● Overcurrent Protection and Thermal Shutdown.

Applications

● Power Tools.

● Motor Drives.

● Access Control Systems.

● Test and Measurement.

Detailed Description

The TPS7A19 combines the capabilities of an LDO and a power good enabler. When VOUT exceeds VT, the power good pin becomes active (PG). The time it takes for the PG pin to fall low after being held high depends on the value of an external capacitor connected to the DELAY pin.

Feature Description

● Enable Pin (EN)

Pin 0 (enable) can withstand excessive voltage. The LDO is enabled as soon as the EN input is given a logic high, and the gadget begins functioning. Connecting this input to the IN pin enables self-bias functionality.

● Regulated Output Pin (OUT)

The output pin labeled “OUT” provides the specified voltage to the circuit. An inbuilt current limiter safeguards the output. The LDO has a soft start function built into it, which regulates the starting current through the pass element. When the LDO loses regulation, the output follows the input less a voltage drop proportional to the load current. Input voltage below the UVLO threshold causes the LDO to stop off until it reaches the minimum start-up voltage.

● Power-Good Pin (PG)

A pull-up resistor from the regulated power supply is connected externally to the power good pin, making it an output. Low output is maintained until the power good delay has elapsed and the regulated VOUT has risen above 91.6% of the desired level. After a brief deglitch time of around 180 s, the output low is asserted when the regulated output falls below the 89.6% level (typical).

● Delay Timer Pin (DELAY)

The temporal delay before the PG pin is asserted high can be adjusted with an external capacitor connected to the DELAY pin. If the output voltage is below the threshold value, an internal comparator will not be tripped while the continuous current charges an external capacitor. A 325 s delay is activated by default if this pin is open (typical).

● Undervoltage Shutdown

The internal Undervoltage shutdown threshold is fixed within the TPS7A19 device family. If the VIN input voltage falls below the VIN UVLO threshold, the device will shut down automatically to prevent damage. In the event of a low input supply voltage, this activation prevents the regulator from becoming latched in a state where it cannot be recovered. In the event of a negative transient that causes the input voltage to drop below the UVLO threshold and then recover, the regulator will shut down and power back up, just as it would during a normal power-up sequence when the input voltage is higher than the needed levels.

● Thermal Shutdown

For safety against overheating, the TPS7A19 includes a thermal shutdown (TSD) circuit. The junction temperature must remain below the TSD trip point for normal operation to continue indefinitely. The output is cut if the junction temperature rises above the TSD trip point. The output reactivates when the junction temperature drops below the TSD trip point minus the TSD hysteresis value. Once the junction temperature reaches about 175 degrees Celsius, thermal protection turns off the output to protect the device. The output circuitry activates when the junction temperature drops to about 150 degrees Celsius.

The on/off status of the thermal protection circuit depends on factors such as power dissipation, thermal resistance, and the surrounding temperature. To prevent the regulator from overheating and breaking, it cycles on and off to maintain a safe operating temperature. The TPS7A19’s built-in protection circuitry is there to keep things from becoming too hot, but it shouldn’t be relied on in place of a good heat sink. The reliability of the TPS7A19 device decreases as it is repeatedly forced into thermal shutdown.

Device Functional Modes

● Operation with VIN < 4 V

Input voltages higher than 4 V are required for the devices to function. Input voltages lower than the true UVLO voltage render the devices inoperable.

● Operation with EN Control

There is a maximum of 1.7 V on the rising edge of enable. The device enables when the input voltage is larger than UVLO rising voltage and EN pin is kept above 1.7 V. Minimum enabling falling edge voltage is 0.4 V. The EN pin becomes inactive when set to a less than 0.4 V voltage. In this condition, the quiescent current is diminished.

● Power Supply Recommendations

The input voltage for the gadget can be anything from 4 V to 40 V. This input source requires strict control. An electrolytic capacitor with a value of 47 F and a ceramic bypass capacitor should be added at the input if the input supply is more than a few inches away from the TPS7A19 device.

Conclusion

In conclusion, the TPS7A19 is a fantastic choice for many applications thanks to its low quiescent current, high output current, and wide input voltage range. Power-good output and a programmable delay complement its built-in thermal shutdown and overcurrent protection, expanding the device’s safety margins and customization options. The compact size makes it a good choice for designs with limited room for other components. In conclusion, the TPS7A19 is a dependable and effective method of producing low-voltage supplies from multiple-rail inputs. ICRFQ is a trusted supplier of top-quality products and offers excellent customer service. Upgrade your power system today with the TPS7A19 from ICRFQ for high-quality and dependable components.

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