PQ07VZ5M2ZZH

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PQ07VZ5M2ZZH Application Field and Working Principle

PQ07VZ5M2ZZH is a high-performance low-dropout (LDO) linear voltage regulator. It is designed using bipolar technology in an SOT-23 package together with special circuit architecture, enabling it to operate with a low dropout voltage of just 350 mV and a high output current capability of up to 500 mA. This LDO is ideal for use with both low-dropout and low-power applications, such as portable electronic and telecommunications products due to its features, wide operating temperature and supply range.

Features

• Ultra low dropout (LDO): 350 mV at 500 mA
• Output current capability up to 500 mA
• Input voltage range: 1.2 V to 5.5 V
• Output voltage range: 1.0 V to 4.8 V
• Over-current protection
• TTL compatible enable input with internal pull-up
• Ceramic capacitors for optimal stability and performance
• Wide operating temperature range: -40°C to +125°C
• Small SOT-23 package
• High power supply rejection ratio (PSRR)

Working Principle

The PQ07VZ5M2ZZH employs a current activation technique to reduce the dropout voltage. This progressive current boost feature is implemented by a combination of two voltage sources (V1 and V2). When the input voltage is about 200 mV to 500 mV lower than the set output voltage, V1 is activated to start boosting the current. When the input voltage is lower than the output voltage, V2 is activated to further increase the current. This method yields a very low dropout voltage and hence a very high PSRR.

Furthermore, the PQ07VZ5M2ZZH is provided with an over-current protection circuit. As the current flowing through the output node increases, the voltage across the internal current sensing resistor rises, turning on the PMOS transistor and reducing the output current. As the input voltage is lowered, the output current is also decreased, further reducing the power consumption.

Applications

The PQ07VZ5M2ZZH is an ideal solution for a broad range of low-dropout and low-power applications, such as mobile systems, portable instrumentation and telecommunications products.

• Portable instrumentation
• Telecommunications
• PDAs
• Cordless phones
• Portable electronic
• Battery-powered equipment
• Digital still cameras
• Portable gaming devices

Conclusion

The PQ07VZ5M2ZZH is a high-performance linear voltage regulator, designed with special circuit architecture to achieve a low dropout voltage as low as 350 mV and to operate with a high output current capability up to 500 mA. It is suitable for use in low-dropout and low-power applications, such as portable instrumentation and telecommunications products due to its high PSRR and wide operating temperature range.

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