A4450: Buck-Boost Controller with Integrated Buck MOSFET

The A4450 is a power management IC that can implement either a buck or buck-boost regulator to efficiently convert automotive battery voltages into a tightly regulated voltage. It includes control, diagnostics, and protection functions.

An enable input to the A4450 is compatible to a high-voltage battery level, (EN).

A diagnostic output from the A4450 includes a power-on reset output (NPOR) signal.

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 A4450 is most suitable for applications where the input voltage can vary from less than or greater than the regulated output voltage.

The A4450 is supplied in 4 × 4 mm QFN (suffix “ES”) with exposed power pad.

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• Automotive AEC-Q100 qualified
• Wide operating range of 3 to 36 VIN, 40 VIN maximum, covers automotive stop/start, cold crank, double battery, and load dump
• Regulated output can operate up to 2 A DC
• Adjustable PWM switching frequency: 250 kHz to 2.2 MHz
• PWM frequency can be synchronized to external clock: 250 kHz to 2.4 MHz
• Frequency dithering helps reduce EMI/EMC
• Undervoltage protection
• Pin-to-pin and pin-to-ground tolerant at every pin
• Thermal shutdown protection
• Operating junction temperature range −40°C to 150°C