PT5105A

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DC DC converters are electrical components that convert a direct current (DC) input voltage to a DC output voltage. The PT5105A is a four-channel adjustable linear DC-DC converter which accurately regulates the output voltage of 0.60V to 5.50V. It has a wide input voltage range of 4.5V to 23V and is comprised of internal MOSFETs, a voltage reference, and an internal comparator. The device includes short-circuit protection, thermal shutdown, and undervoltage lockout. The PT5105A provides a high-efficiency 2MHz switching frequency, a low quiescent current and high-precision voltage regulation.

Application Field

The PT5105A is ideal for powering small, low-power electronic devices that require a regulated DC output. It can be used in USB Type-C charging ports, portable audio players, automotive infotainment systems, digital cameras, reference voltage circuit, smart phone, laptop computer, and tablet PC applications.

Working Principle

The PT5105A operates as a step down converter, regulating the output voltage by regulating the on-time of an internal N-channel power switch. The on-time is governed by comparing the feedback input to the internal reference voltage. The internal switch is operated in a switching mode at a frequency determined by a ramp signal. The ramp signal is generated by an internal oscillator and is used to keep a constant on-time ratio between the high and the low pulse. By changing the resistance at the frequency setting pin, the frequency of oscillator can be varied to meet the desired output current.

When the input voltage is higher than the targeted output voltage, the switch is closed and the current is conducted from the input to the output. The switch is then opened to complete the switching cycle, and the pulses of the output current harmonically combined together, allowing the output voltage to be converted from one level to another. The on-time and duty cycle of the output current are adjusted until it reaches the targeted level of output voltage.

The PT5105A features a low ripple, adjustable output current limit and soft-start, adjustable slew rate, Under Voltage Lockout (UVLO), and Thermal Shutdown (TSD) protection. The device also features a typical efficiency of 96%, and a low quiescent current of 45µA. It also features a low minimum load current of 5mA.

Conclusion

The PT5105A is a four-channel adjustable linear DC-DC converter that is capable of accurately regulating the output voltage from 0.60V to 5.50V and has a wide input voltage range of 4.5V to 23V. It is ideal for powering small, low-power electronic devices that require a regulated DC output, and is capable of providing high levels of precision voltage regulation and efficiency. The PT5105A features low ripple, adjustable output current limit and soft-start, adjustable slew rate, Under Voltage Lockout (UVLO), and Thermal Shutdown (TSD) protection.

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