TPS76138DBVT

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The TPS76138DBVT is a high PSRR, low dropout linear voltage regulator (LDO) with multiple fine-grained voltage settings. It provides up to 4 applications. Primarily designed to supply power to small devices that require low-voltage and low-power performance, such as digital still cameras and the sub mirror box of laser projection TV systems, the regulator operates from an input voltage of up to 15V, and an adjustable output voltage of 1.3V to 5.5V. Additionally, an LDO having a wide noise bandwidth from 150kHz to 1MHz is included, enabling smooth and stable supply voltage to the logic IC.

The TPS76138DBVT gains numerous advantages from its integrated features. This includes the ultra-low power consumption, (<1μA), compact package (SOT23-5), adjustable output voltage range of 1.3-5.5V, low dropout voltage (280mV -400mV), low noise (≤10μVRMS), fast transient response, and excellent PSRR of -75dB. Adding to that, the TPS76138DBVT is available in an ultra-small, low-profile (1.0mm) TSOT23-5L-3 package.

The TPS76138DBVT is primarily used in applications that require a minimum power consumption and high power supply rejection ratio. Examples of such applications involve low-power systems, digital still cameras, and sub mirror box of laser projection TV systems. For instance, it can be used to supply power to the logic circuitry of a camera, such as the image processor and CPU, while providing ultra-low noise to obtain excellent image quality. Additionally, the high PSRR isolates LDO noise from external noise sources, ensuring stable supply voltage to the system.

The TPS76138DBVT has multiple functions. It is capable not only of providing power, but also of controlling the system by monitoring and tracking the voltage accurate within ±1.5%, minimizing system-level power dissipation. The ON/OFF feature incorporates a logic-level enable pin, allowing for ON/OFF control without the need for external components. Moreover, the integrated thermal shutdown circuitry protects the device and system by shutting down the output upon overheating.

The operation of the TPS76138DBVT is based on the operating principle of linear voltage regulation. It relies on a voltage divider circuit to maintain the output current and voltage within specified limits. As the output voltage increases, the regulator diverts a fraction of the output current away from the load and sends it to the base of the pass transistor, allowing the output voltage to remain stable. The output voltage is adjusted using an external feedback voltage, which is generated by a ratio of two resistors. The input voltage is compared to the feedback voltage, and the difference is used to control the pass transistor. This ensures that the output voltage is tightly regulated and independent of the load conditions.

The TPS76138DBVT is a powerful, reliable, and energy-efficient linear voltage regulator with a wide range of applications. Its integrated functions and operational principle makes it ideal choice for small low power systems, digital still cameras, and sub mirror boxes of laser projection TV systems, where precise voltage regulation, low noise and power supply rejection are paramount.

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