TPS61028DRCR

TPS61028DRCR is a synchronous buck converter unit, specifically designed for providing power supply solutions for mega-pixel image sensors and other low power applications in the digital camera market. It is part of a family of voltage buck converters within TI’s Advanced Power Management Platform that includes general purpose switching regulators. This DC-DC converter is available in a 1.5 mm x 1.5 mm, 10-pin Thin MLP package, which incurs minimal additional board space requirement and still allows it to provide stable and efficient power supply in high current applications.

Applications

The TPS61028DRCR is specifically tailored for medium and high current applications, making it an ideal selection for mega-pixel image sensors and other low-power application in the digital camera market. It is a 3.2 V to 0.8 V step down converter designed to provide a regulated supply from a single Li-ion battery ranging from 3.2 V to 8.4 V. The device is capable of delivering output current up to 4A, this makes it well suited for large loads like image sensors, processors, FPGA’s, DSPs, RF transceivers and thumb drives.

Working Principle

The TPS61028DRCR synchronous buck converter is a high-efficiency, low-dropout voltage regulator which uses a buck topology. This topology is based on the principle of continuous voltage control by continuously adjusting the duty-cycle of the pass transistor controlling the output current. This is achieved by PWM modulating the output voltage through a Pulse Width Modulator (PWM) control logic. The PWM controller includes a voltage feedback loop that regulates the output voltage over given temperature and load variations.

The PWM control of the TPS61028DRCR can be adjusted by changing the reference frequency through the FSEL pin which can range from 200 kHz to 1 MHz. This feature makes it ideal for low noise sensitive applications, allowing the user to select an appropriate frequency for the signal to suppress EMI and reduce noise. The TPS61028DRCR also offers protection against ESD (electro-static discharge) via a UVLO (Under Voltage Lock Out) that puts the switching regulator into a low current, low output voltage state when the the input supply drops below a certain threshold. This ensures that any interference, such as ESD, does not damage the device.

The TPS61028DRCR includes an on-chip Power Good (PG) signal which is used to alert the digital load that regulated output voltage is within the voltage accuracy range. PG signal is asserted when the regulated output voltage is within 8% of the programmed output voltage limit. This is useful when there are multiple supplies that need to be monitored. In addition, the device also offers a Sleep Mode function, which is activated by bringing the SLEEP pin to a logic low state. This puts the switching regulator into a low current mode, enabling it to enter a low power sleep mode thereby conserving battery life.

Conclusion

The TPS61028DRCR is a high performance integrated solution for power management in mobile applications. It provides excellent efficiency, low drop out voltage and wide input and output voltage range, which makes it an ideal choice for powering image sensors and other low-power applications in the digital camera market. It also offers excellent protection for any external interference and a sleep mode for conserving battery power. With its compact size, the TPS61028DRCR is a great solution for low-profile applications.