LX1673-03CPW

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The LX1673-03CPW is a low-noise, 3-phase synchronous, high-current, dc-dc regulator controller that combines a typical buck converter with a low-dropout linear regulator. It is one of the most powerful controllers in its class with features such as adjustable output voltage and over-current protection. The LX1673-03CPW is typically used in high-end and application-specific applications such as industrial systems, robotics, aircraft, and medical systems. It is also used in telecommunications, power supply, automotive, and many other applications.

The controller integrates three independent buck regulated outputs designed to provide exceptional current capability and a low-noise clock input that allows for synchronization to an external source.

The operating principle of the LX1673-03CPW is based on a Pulse Width Modulation (PWM) structure. The integrated clock generator synchronizes the main power switch to a 70MIPS clock and provides an adjustable switching frequency. The switching frequency helps minimize the output voltage ripple and provide improved transient output voltage tracking. The controller requires the use of an external clock for synchronized operation.

The LX1673-03CPW features two error amplifiers for tracking regulation, two power transistors for paralleled synchronous buck operation, two over-current comparators, an adjustable reference voltage for an additional low dropout linear supply, and a short circuit/over temperature protection.

The LX1673-03CPW has an adjustable output voltage range of 0.8V-5V. It is capable of driving external power MOSFETs with a current up to 15A. Furthermore, the LX1673-03CPW has a fast response time and excellent transient response.

In terms of performance, the controller features a typical operating temperature of -55°C to 125°C, a typical voltage accuracy of 0.5%, a minimum current limit of 0.1 A, a minimum tracking of 25mV, a peak current limit of 45A, and efficiency up to 95%.

In conclusion, the LX1673-03CPW is a low-noise, 3-phase synchronous, high-current, dc-dc regulator controller that offers adjustable output voltage, over-current protection, excellent current and voltage capability, excellent transient response, and adjustable switching frequency.

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