UC2902DTR Integrated Circuits (ICs)

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UC2902DTR Application Field and Working Principle

UC2902DTR is a low drop-out voltage regulator designed for use in applications requiring a regulated voltage supply. It is a three terminal device which offers space savings and freedom from back-biasing of the power supply line circuitry in a wide range of voltage requirements in digital and mixed-signal systems. The device operates in a voltage range of 2.0V up to 17V and is rated for output current of up to 10A.

UC2902DTR’s primary application field is in applications requiring greater current level than can be supplied by linear regulators, especially in portable devices, systems with small form factor, or other applications where tight power budget is required. It is well suited for low power RF and wireless communications systems, computer systems for energy efficiency and high performance data processing, portable medical instruments, and other power sensitive applications.

Working with UC2902DTR is simple and easy. The IC offers on-board precision 5V reference, which provides 1% output current accuracy. It also contains low noise, high-accuracy error amplifier, and protective circuitry against out of range input voltage and current, a PWM oscillator synchronized to an external clock, and thermal protection for over-current operation. The regulation loop can be controlled by an external VBIAS input, which can be used to adjust the output voltage. An EN pin is also available which enables/disables the regulator. With these features, UC2902DTR provides accurate and robust voltage regulation even in the most challenging environments.

UC2902DTR’s working principle is based on a switched capacitor voltage/current converter (SC-VCC). This converter uses a capacitor on the output side to store energy and generates a regulated output voltage by controlling the current provided by the input side. The amount of energy stored in the output capacitor and the voltage across it can be adjusted by varying the duty cycle (or switching frequency) of the input side switch. The IC has an internal comparator and latch, which compare the feedback and reference voltage, to control the output voltage, and an external voltage divider attached to the VBIAS pin, which can be used to adjust the output voltage.

The UC2902DTR is also capable of delivering extremely low output current. This can be achieved by reducing the reference voltage together with the low noise and jitter-free pulse-width modulator circuitry. The low output current feature enables the device to run efficiently at low current and power levels, to further enhance the energy efficiency.

In summary, the UC2902DTR is an ideal solution for a wide range of applications requiring low drop-out voltage regulation, and it is especially suitable for those where space is limited. Thanks to its wide range of features, UC2902DTR will enable higher performance and longer battery life for a variety of digital and mixed-signal systems.

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