TPS7A8012DRBT

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The PMIC voltage regulator is an essential component of any electrical system as it ensures that the voltage stays within the safe limits. The TPS7A8012DRBT is a very popular linear voltage regulator specifically designed to provide ultra-low dropout voltage and excellent ripple rejection with limited external component count.

Key Features

• Ultra low dropout voltage: 0.9 V at 125 mA
• Input voltage range: 1.5 V to 5.5 V
• Internal reference voltage: 0.9 V at 10 μA
• Output voltage accuracy: ± 0.5%
• Operating temperature range: - 40°C to 85° C
• Ripple rejection: 100 dB at 1 kHz
• Output current: 125 mA
• Low quiescent current: 7.8 mA @ 125 mA

Application Fields

The TPS7A8012DRBT is an ideal choice for portable applications that require very low dropout and high ripple rejection. It can be used for powering microcontrollers, DSPs, ASICs, LCD displays, LEDs and other control circuits. It can also be used in automotive, computer, industrial, communications, consumer and instrumentation applications.

Working Principle

The TPS7A8012DRBT is a low-dropout (LDO) linear regulator that works by controlling an internal pass device MOSFET. It consists of an input voltage (Vin) pin, a feedback voltage (Vfb) pin and an output voltage (Vout) pin. The internal reference voltage (Vref) of 0.9 V is compared to the input voltage (Vin). If Vin is greater than Vref, the pass device turns on and allows current to flow through it. The current is limited to a maximum of 125 mA. The output voltage is determined by the feedback voltage (Vfb) which is compared to the reference voltage (Vref). This feedback loop maintains the output voltage at the desired level. The current flowing through the pass device creates a voltage drop across it, causing the output voltage to be lower than the input voltage (Vin). By offsetting the Vfb, the output voltage can be adjusted to the desired value.

Conclusion

The TPS7A8012DRBT is a very popular linear voltage regulator that delivers ultra-low dropout voltage and excellent ripple rejection. It is ideal for a wide range of applications such as powering microcontrollers, DSPs, ASICs, LCD displays, LEDs, etc. It is also suitable for automotive, computer, industrial, communications, consumer and instrumentation applications. The working principle explains how it works by controlling an internal pass device MOSFET and comparing the feedback voltage to the reference voltage to adjust the output voltage.

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