TPS40000DGQRG4

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The TPS40000DGQRG4 is a step-down DC-DC switching controller IC used to regulate the output voltage of DC/DC converters by controlling the duty cycle of a VMOS power switch. The device combines voltage loop regulation, current sensing, and correct control algorithm that allows minimum component count and low cost design for power supplies up to 2A.This step down controller is an advanced system-level analog controller for high-performance...

Application Field

TPS40000DGQRG4 is suitable for applications such as low-cost computing, as well as bSLI-compatible architectures in fixed-frequency, voltage-mode routers and switchers, and audio systems. Other applications include motherboard voltage regulation, computer power supplies, phone power management, chargers, adapters, and battery operated systems.

Working Principle

The TPS40000DGQRG4 works by adjusting the duty cycle of the VMOS power switch in order to regulate the output voltage. The device monitors the output voltage using its voltage loop, calibrates it to the desired voltage set by the external resistor divider, adjusts the VMOS power switch duty cycle, and then maintains the output voltage constant. When the input voltage is low, the device reduces the peak current-limit value to prevent overloading the supply while maintaining the desired output voltage. The device also implements an auto-restart function that automatically restarts the device after a current overload or short circuit event. In addition, the device includes a power good flag, allowing the system to detect when the output voltage is in regulation.

To achieve a high-performance solution, the device has three additional features: a “sleep” mode to reduce system power consumption in no-load conditions, a soft-start feature to reduce system inrush current, and over-voltage protection (OVP) to prevent damage to downstream components.The controller includes several parameters that can be programmed to optimize performance, including switching frequency, current-limit level, soft-start time, and OVP threshold.

The operational amplifier allows an external compensation network to be connected to optimize the behavior of the loop. The device also has analog and digital input pins to allow remote configuration and monitoring of the output voltage. These digital pins are compatible with the widely used I²C and SMBus communication protocols.

The TPS40000DGQRG4 is a robust controller optimized for low-cost and low-power DC-DC applications. With integrated features, the device minimizes the need for external components, allowing for high performance and low cost solutions.

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