TPPM0302DGN

TPPM0302DGN is a three-terminal, low-dropout voltage regulator. It is specialized for use in linear voltage regulator circuits. This regulator is designed to provide high output current and improved power supply rejection, while keeping low external components count and board space.

General Introduction

The TPPM0302DGN from Torex Semiconductor utilizes dual P-channel MOSFETs of different threshold voltages to provide low dropout voltage and high output current capability. This chip provides logic compatibility, does not require external boot strapping current source and eliminate popple and overshoot turnovers. It has a low quiescent current of 200μA and is suitably optimized for high PSRR (power supply rejection ratio).

The 3-pin voltage regulator has a wide input voltage range of 2.3V to 17V. It also supports a wide output voltage range of 0.3V to 7V. It offers an accuracy of ±2%. The TPPM0302DGN is suitable for 5V, 3V and other fixed output voltage applications in host and peripheral systems, as well as any variable output voltage system requiring accurate output voltage control.

Key Specifications of TPPM0302DGN

• Input Voltage: 2.3V to 17V.
• Output Voltage: 0.3V to 7V.
• Output Current: up to 2.4A.
• Linear Regulation Accuracy: ±2%.
• Quiescent Current: 200 μA.
• PSRR: 60 dB max at f=1KHz.
• Dropout Voltage: 0.45V (typical) @ 300 mA load.
• Logic Compatible: Yes.
• Shutdown Support: None.
• Package: SOT25.

Applications

• Battery-powered applications.
• Distributed power system.
• Audio equipment.
• Digital cameras.
• Digital camcorders.
• Small note PC and other portable devices.
• Power amplifiers.

Working Principle

The working principle of TPPM0302DGN is based on its dual, P-channel MOSFETs of different threshold voltages. The adjustable current source, which is connected to the gate of two MOSFETs, decreases the overall dropout voltage of the regulator. This is applied to the input voltage VIN, creating a constant-current source with a voltage drop across the resistors R1 and R2. The current is further divided into two parts passing through each of the two differently sized MOSFETs, automatically adjusting the voltage drop across them based on the input voltage VIN.

The output voltage is stabilized by comparing the feedback voltage having a constant reference voltage such as 0.6V, 1.2V, 1.4V, etc., depending on the output voltage desired by the application. The error amplifier modulates the output voltage by controlling the gate voltage of the dual MOSFETs to maintain a regulated output voltage.

The quiescent current of the device is around 200μA, which reduces further as the load current increases. The device utilizes the ultra-low-dropout feature to maintain the accuracy of the output voltage, even when the input voltage drops to a lower level than the value generated at the output side.

Conclusion

The TPPM0302DGN is a dual P-channel MOSFET specific low-dropout voltage regulator with an input voltages range of 2.3V to 17V and output voltage range of 0.3V to 7V. It is used in applications that require ultra-low dropout and high power efficiency. Torex Semiconductor offers this device in a SOT-25 package. This regulator offers a wide range of features including small component count, high accuracy, and high power supply rejection ratio.