A4450 Buck-Boost Controller with Integrated Buck MOSFET

Allegro MicroSystems features their A4450 buck-boost regulator positive output step-up/step-down DC-DC controller IC 20-pin QFN

Allegro's A4450 is an automotive power management IC that can implement either a buck or buck/boost regulator to efficiently convert automotive battery voltages into a tightly regulated voltage with seamless transition between the buck and boost modes.

It is ideal for automotive input environments where battery input voltage supplies can vary above and below the required output voltage and a single inductor / single stage conversion is desired. The PWM switching frequency range is 250 kHz to 2.4 MHz and frequency dithering and controlled switching transitions minimize EMI. The A4450 maintains excellent stability even when the input and output voltages are at nearly the same level as well as through line and load transient events.

Protection features include pulse-by-pulse current limit, hiccup mode short-circuit protection, LX short-circuit protection, missing freewheeling diode (buck diode at LX node in A4450) protection, and thermal shutdown. The enable input is compatible to a high-voltage battery level and a power-on reset output (NPOR) is integrated. The device is packaged in a 4 mm x 4 mm QFN which is ¡°wettable flank¡± and AEC-Q100 qualified.

Features and Benefits

• Automotive AEC-Q100 qualified

• Supply voltage from 3.0 V to 36 V, 40 V maximum

• Regulated output voltage range 3 V to 8 V at up to 1 A DC

• Adjustable PWM switching frequency: 250 kHz to 2.2 MHz

• Automotive-grade; facilitates system level certification

• Covers automotive stop / start, cold crank, double battery, and load dump conditions

• Provides regulated DC power for a variety of infotainment applications

• Avoids interference in AM frequency band and audible noise; high frequency reduces implementation size

• Improves EMC performance

• Can be used to sequence converter or initiate microcontroller reset and shutdown

• Enables switched battery operations

• Frequency dithering

• Negative power on reset (NPOR)

• High voltage rated enable (EN)

A4450 Buck-Boost Controller with Integrated Buck MOSFET

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