Automotive Compliant 3.5A Synchronous Buck Converters for Point of Load (POL) Applications

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ByDinesh Kumar 0

Automotive Compliant 3.5A Synchronous Buck Converters from Diodes Incorporated

Diodes Incorporated has introduced AP64350Q, AP64351Q, and AP64352Q, a series of automotive-compliant, 3.5A, Synchronous buck converters that combine a low quiescent current with a wide input voltage range of 3.8V to 40V point of load (POL) applications. The AP6435xQ provides high-efficiency step-down DC-DC conversion with the help of the fully integrated 75mΩ high-side power MOSFET and 45mΩ low-side power MOSFET. AP6435xQ’s gate drive/bootstrap design allows it to operate in low dropout (LDO) mode, allowing near 100% duty cycle.

The devices enter to pulse frequency modulation (PFM) to increase the efficiency when the load current tends to become zero, this will result in a quiescent current of just 22μA. The devices also include a frequency spread spectrum (FSS) with a switching frequency jitter of ±6% and a proprietary gate driver scheme, this reduces high frequency radiated EMI noise caused by MOSFET switching.

The AP64350Q and AP64352Q have an adjustable switching frequency (100kHz - 2.2MHz) and it can be synchronized to an external clock. This feature provides design flexibility to deliver a choice of low frequency with extremely high efficiency, or high frequency for a small form factor solution when the switching frequency is outside the AM band.

The AP64351Q and AP64352Q have programmable soft-start, which reduces inrush currents, whereas the AP64350Q and AP64351Q have external compensation to optimize loop response. Know more about the AP64350Q, AP64351Q, and AP64352Q, visit the official website of Diodes incorporated.

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