TPS40130DBTG4

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TPS40130DBTG4 is a synchronous buck converter designed as a voltage regulator. It regulates voltages by switch actions and its single output range is adjustable from 0.8V to 3.3V with ±2% accuracy. This switch controller has an outstanding feature that it operates with a minimum of external components due to on-chip termination resistors, internal oscillator and error amplifier. It also includes a wide operating temperature range up to 150°C. TPS40130DBTG4 is mainly used in portable and data storage applications like GPS systems, DVD/CD players and recorders, HDD, flash/pen drive, audio amplifiers, medical systems and instrumentation.

As a voltage regulator, TPS40130DBTG4 includes an integrated, high-gain error amplifier that processes the feedback from an external resistive divider. The error amplifier compares the output with the internal reference voltage set at 1.19V. The error amplifier output voltage is fed to the PWM comparator which acts as a comparator to compare the error amplifier output with a sawtooth waveform generated by the internal oscillator. If the error amplifier output voltage is higher than the sawtooth voltage, a logic high is applied to the PWM logic circuit, and then the PMOS on the high side is initiated. On the other hand, the NMOS on the low side is initiated if the error amplifier output voltage is lower than the sawtooth voltage. Thus, the buck switching actions are resulted by a combination of PWM and PFM techniques and the output voltage is regulated to the designed level.

The inductor of the voltage regulator is selected with respect to the maximum peak current of the output current, impedance, and frequency. Usually, higher frequency provides lower inductance, which helps to reduce the size of the inductor. By controlling the PWM shut-off voltage threshold, TPS40130DBTG4 enables power saving modes and reduces the input current in no load conditions. Also, the frequency of the internal oscillator can be ramped down in light loads to reduce the power consumption.

The TPS40130DBTG4 can also provide over voltage protection. By setting the VOV LEVEL pin, the TPS40130DBTG4 stops the switching operation if the voltage at FB pin exceeded the pre-set level. This protects the device from potential damage by over voltage. TPS40130DBTG4 also has an innovative feature of current path control (CPC), in which, if the current detector senses an output current overload, the device shuts down immediately to avoid excessive currents. This helps in improving the reliability of the system.

In summary, TPS40130DBTG4 is an excellent voltage regulator, which can provide high accuracy, wide operating temperature range and excellent power saving features with minimal number of external components. It has a wide application range in portable and data storage applications, making it an ideal choice for system designs.

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