TPS40200HD

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The Texas Instruments TPS40200HD is a high current, low side field effect transistor (FET) switch dc-dc controller that is designed to drive an N-channel MOSFET from an input voltage source. The device is ideal for applications that require very low current-limit for power sharing or current-foldback protection. It features an adjustable current limit, over-temperature protection, protective shutdown, and well-matched synergy with TI\'s power management integrated circuits (PMICs).

Overview

The TPS40200HD is a high-current, high-efficiency, dual-output, low-side NFET switch dc-dc controller designed to provide a wide output voltage range, higher current levels, and improved regulation accuracy compared to traditional DRV solutions. With its low gate drive current, the device is well suited for use in high-current, high-voltage applications, such as point-of-load (POL) architectures and distributed power architectures, where a lower gate driver cost is desired. It features an adjustable current limit, as well as over-temperature and protective shutdown protection.

The device has an integrated current-sense amplifier, which allows for low-gate charge output control and accurate current limit control. The pre-biased NFET gate drive outputs are capable of driving both low- and high-side NFET devices. The device can also be used in applications that require switching devices with large source-drain impedances, such as LDO voltage regulators.

Application Field

The TPS40200HD is ideal for use in automotive and industrial applications that require current folding and power sharing, such as multiphase synchronous rectification DC-DC converters. It is also suitable for automotive and industrial applications that require robust over-current protection. Additionally, the TPS40200HD is well suited for use in POL and high-current, high-voltage applications, such as strobe lighting, memory modules, and flash memory.

The device can also be used to implement over-current protection in a wide range of applications, such as: notebook AC adapters; dc-dc converters; processor core rails; integrated graphic controllers (IGPs); and field-programmable gate array (FPGA) modules.

Working Principle

The main operating principle of the TI TPS40200HD is an integrated current-sense amplifier and low-side NFET gate driver approach. The presence of the NFET output limits the maximum current that can be sourced or sunk and allows the device to be used in applications that require current-fold or power sharing. The current-sense amplifier is used to detect the output current and control the NFET gate voltage. The output current is determined by setting the resistance of the external current sensing resistor and is then monitored by the internal current-sense amplifier.

When the output current reaches the programmed limit, the current-sense amplifier removes the bias from the NFET gate and disables the channel. The current-sense amplifier also provides temperature protection. When the temperature of the device reaches the programmed value, the NFET gate drive is removed, disabling the channel until the device temperature returns to a safe level.

The TPS40200HD also features integrated protective shut-down circuitry which is activated upon detection of an over-current or over-temperature event. This circuitry can be used to protect the system from possible malfunctions and ensure device longevity. Additionally, the device can be used in multi-phase synchronous rectification initatives, such as multi-phase dc-dc converters, where current-fold or power-sharing of the phases is desired.

Conclusion

The Texas Instruments TPS40200HD is a versatile, high-current, low side NFET switch dc-dc controller that offers excellent performance and high efficiency. The integrated current-sense amplifier allows for current folding and power sharing, as well as over-current and over-temperature protection. The device is well suited for use in automotive and industrial applications that require high current-level, high gate-voltage drive, and wide output voltage range.

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