TPS40040DRBTG4

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TPS40040DRBTG4 is a highfrequency, POL high-performance DC/DC Synchronous Buck Controller designed for high efficiency, low noise, low component count and improved power density in distributed power systems. It is well-suited for high frequency, non-isolated DC/DC conversion. It enables the power supply design to be optimized for efficiency and ease of implementation by using two integrated power switches to drive two independent output banks.

The TPS40040DRBTG4 provides many features that address the needs of distributed power systems, such as adjustable pulse-skipping output voltage mode and adjustable phase-shift full-speed operation. Additional features include differential remote feedback connection, low-impedance ground sensing, fold-back current limit, open-loop output voltage latch mode and adjustable slew rate control. Furthermore, the TPS40040DRBTG4 includes flexible power management options that allow the designer to configure the power output and priority, either through software or hardware.

The standard four-terminal, dual output synchronous buck controller combines power device drivers, gate drivers, and control logic into a small, low-cost package and requires very low board space. The device is offered in TSSOP-16 and QFN-20 packages. When combined with power switches, the TPS40040DRBTG4 can provide up to 17A output with efficiency greater than 90%.

The TPS40040DRBTG4 is suitable for applications such as distributed CV/CC power supplies, voltage regulators in cellular base stations, high speed point of load (POL) converters for FPGAs, and low noise dc/dc conversion for DSPs, ASICs, and other power sensitive circuits.

Application Field

The TPS40040DRBTG4 is a robust, high frequency, POL high-performance DC/DC synchronous buck controller designed to optimize EMI and power efficiencies. The device is well-suited for high frequency, non-isolated DC/DC conversion.

Distributed Power Systems: The TPS40040DRBTG4 allows designers to optimize power supply design to be more efficient and cost-efficient by using two integrated power switches to drive two independent output banks. Common applications for distributed power systems include cellular base stations, FPGAs, DSPs, ASICs, and other power sensitive circuits.

Voltage Regulation: The device\'s adjustable pulse-skipping output voltage mode and adjustable phase-shift full-speed operation capabilities allow the device to be used for voltage regulation in high efficiency and low noise applications. The device also includes low-impedance ground sensing, fold-back current limit, and adjustable slew rate control for regulated performance.

Working Principle

The TPS40040DRBTG4 is a synchronous buck controller that drives two separate power switches in a synchronous configuration. The device contains logic that monitors the voltage across the output and synchronize the switching of the two power switches to regulate the output voltage of the converter. The output is regulated based on the reference voltage applied to the FB pin. The output voltage will be regulated within a few mV of the voltage set by the resistor divider connected to the FB pin.

The device contains an internal PLL that is used to synchronize the switching of the two power switches. The PLL amplifies the voltage signal from the VFB pin and uses this signal to generate a signal that is then compared to the signal from the oscillator. The PLL signal is then used to generate signals for both power switches based on the predetermined phase shift value set by the PH pin. The duty cycle of the power switches is determined by the voltage applied to the COMP pin.

The device can also be used in an open-loop output voltage latch mode. The open-loop output voltage latch mode sets the output voltage based on the voltage applied to the FB pin. The voltage applied to the VFB pin is compared to the voltage applied to the FB pin and the output voltage is adjusted accordingly. In this mode, the VREF pin is not used.

The TPS40040DRBTG4 also provides flexible power management options, allowing the designer to configure the power output and priority either through software or hardware. The device can be programmed to prioritize the current delivered to the primary load, or to limit the current drawn from the supply to the secondary load. In addition, the device enables the designer to employ dynamic voltage scaling, allowing the output voltage to be adjusted to best meet the power requirements of the application.

The TPS40040DRBTG4 is a low-cost, high-performance solution that is well-suited for high frequency, non-isolated DC/DC converter applications. The device combines power device drivers, gate drivers, and control logic into one, small, low-cost package, enabling designers to optimize their designs for efficiency, low noise, low component count, and improved power density.

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