TPS79628DCQ

TPS79628DCQ Application Field and Working Principle

The TPS79628DCQ is a DC/DC step-down integrated circuit (IC) from Texas Instruments. It is part of their TPS79xx family of low-cost and high-efficiency, fixed-frequency, synchronous-mode step-down regulators. The TPS79628DCQ is designed for use in portable, online and offline applications, including mobile phones, automotive systems, storage systems and other consumer electronic products.

The TPS79628DCQ integrates a high-side and low-side MOSFETs in a single package in order to provide a complete 1.2 A step-down DC/DC converter. The device has a wide operating voltage of 8 V to 28 V and operates at a constant frequency of 2.25 MHz, allowing the use of small, inexpensive external components. The device can deliver up to 1.2 A at an output voltage of 1.2 V, while maintaining excellent line and load transient response.

Features

• Wide input voltage range: 8 V – 28 V
• Output voltage range: 0.6 V – 3.3 V
• Output current: 1.2 A
• Ultra-low quiescent current: 15 μA
• High efficiency: Up to 96%
• Fast transient response
• Soft-start/pre-bias start-up
• Fixed-frequency 2.25 MHz switching frequency
• Over-current protection
• Thermal shutdown protection

How It Works

The TPS79628DCQ is a synchronous buck converter. The device steps down a higher input voltage to a desired output voltage. It consists of two external switches (a low-side N-channel MOSFET and a high-side N-channel MOSFET) and one power converter (the inductor). The high-side and low-side MOSFETs are turned on and off by a control circuit in order to generate a controlled output voltage from the input voltage.

When the switch is turned on, current begins to flow through the inductor and the output voltage is being generated. When the switch is turned off, the current continues to flow through the inductor but is no longer being supplied with energy from the input source. This is where the ESR of the output capacitor comes into play. The capacitor helps to maintain the output voltage by supplying current to the output load.

In order to regulate the output voltage, the TPS79628DCQ implements a pulse-width modulation (PWM) control system. In this system, the control circuit turns the switch on and off at regular intervals. The duty cycle of the PWM signal is adjusted in order to regulate the output voltage. The switch is cycled faster at a high duty cycle and slower at a low duty cycle.

Benefits of TPS79628DCQ

The TPS79628DCQ offers a number of benefits to a wide range of applications. Its low quiescent current of 15 μA makes it ideal for portable battery-powered systems. Its small size and integration of the high-side and low-side MOSFETs makes it suitable for use in limited space applications, such as automotive systems and mobile phones. Its high efficiency of up to 96% and wide operating voltage of 8 V to 28 V make it ideal for use in online and offline applications. Finally, its fast transient response and over-current protection make it suitable for use in high-performance computing applications.

Conclusion

The TPS79628DCQ is a highly integrated step-down DC/DC converter designed for use in portable, online and offline applications. It provides an ideal solution for applications that require a small, low-cost and high-efficiency regulator. It is capable of delivering up to 1.2 A of output current at an output voltage of 1.2 V, while offering excellent line and load transient response. The device is also well-suited for use in automotive systems and mobile phones, due to its low quiescent current and small size.