A4450: Buck-Boost Controller with Integrated Buck MOSFET

Description

Top Features

Packaging

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.

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

Typical Applications

Allegro 20-Pin 4mmx4mm QFN ES with wettable flank package

The A4450 is supplied in a 20 pin 4 × 4 mm QFN (suffix “ES”) package with a wettable flank and exposed power pad.

ES Package Documentation

Documentation and Resources

Design Support Tools

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Document Type	Document Name
Simulation Tool	A4450 Design Tool

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