LT3667HUDD

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LT3667HUDD Application Field and Working Principle

The LT3667HUDD is an adjustable, high-efficiency, dual-phase synchronous step-down power module (PMIC) featuring low-voltage operation, adjustable operating frequency and other advanced features. The voltage regulator is ideal for a wide range of applications including point-of-load (POL) DC/DC conversion, battery-operated systems, and industrial and automotive applications.

Power Module Features

• Wide input voltage range of 4.5V to 36V.
• Low-voltage operation of 2.5V gate drive and 1.2V logic supply.
• Dual-phase, independently adjustable operating frequency.
• Dual-phase, independently adjustable output current limit.
• Four-level voltage accuracy of +/- 0.8%, 1.2% for the 0.4V mode.
• Over-temperature and thermal shutdown protection to protect the PMIC from excessive power dissipation.
• Active EMI filtering, including sensing on the output node and common-mode filtering.
• Integrated output capacitor discharge path to reduce output noise and output slew rate.

Application Fields

The LT3667HUDD power module is well-suited for DC/DC conversion, battery-operated systems, industrial and automotive applications such as laptops, tablets, and other handheld devices. It is also suitable for applications that require precision voltage regulation such as LED backlighting systems, regulation of battery charger output, and use in high-precision current sensing circuits. The low-voltage operation, adjustable operating frequency, and high-accuracy output voltage make this PMIC ideal for applications where multiple power rails are required.

Working Principle

The LT3667HUDD is a dual-phase synchronous step-down power module featuring low-voltage operation and adjustable operating frequency. The LT3667HUDD employs two independent synchronous step-down converters each with its own operating frequency and voltage feedback path for precise voltage regulation. The dual-phase operation allows for higher efficiency and lower output noise than its single-phase counterpart. The control architecture of the LT3667HUDD significantly reduces the system cost and allows for a wide range of voltage regulation, ranging from 0.4V to maximum input voltage. Over-temperature and thermal shutdown protection are also included to protect the PMIC from excessive power dissipation.

The LT3667HUDD includes several other advanced features that enable higher efficiency and improved regulation accuracy. An active EMI filter allows the system architect to customize the external filter components for compliance with industry standards or enhance noise performance in extreme conditions such as high line noise or packed circuit boards. The integrated output capacitor discharge path reduces output noise and output slew rate for improved system stability and noise immunity.

Conclusion

The LT3667HUDD is a high-efficiency, adjustable, dual-phase synchronous step-down power module (PMIC) featuring low-voltage operation, adjustable operating frequency and other advanced features. It is ideal for a wide range of applications including point-of-load (POL) DC/DC conversion, battery-operated systems, and industrial and automotive applications. The dual-phase synchronous step-down converters and the active EMI filter enable the PMIC to provide an efficient and reliable voltage regulation performance in a wide range of application conditions. The low-voltage operation, adjustable operating frequency, and high-accuracy output voltage make this PMIC an ideal choice for applications requiring multiple power rails.

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