Allegro MicroSystems, LLC Announces Wide Input Voltage Inductorless Buck-boost Regulator

5V @50mA with operation down to 3.5Vin and harness short protection

August 29, 2017

A4480 Product Image

Allegro MicroSystems, LLC has announced the release of a new wide input 5 V output regulator designed to power automotive sensors and low power uControllers. It can also be used for non-automotive applications where the input voltage could be above or below 5 V.

Allegro’s A4480 incorporates a unique multi-mode charge pump pre-regulator, followed by a 5V LDO. This enables operation with input voltages from 3.5 to 28 V (with 40V protection), while maintaining a 5 V output voltage. Compared to traditional LDO solutions, the efficiency across input range is improved, and VIN < VOUT operation is enabled. Furthermore, as opposed to traditional switching solutions no inductor, diode, or external switching element is required in this simple, low component-count optimised solution.

The enable pin (ENB) is rated to operate at up to 40 V, so it can be connected directly to VIN (e.g., vehicle battery). The IC includes an open-drain Power OK (POK) output, and protection features include input undervoltage lockout (UVLO), foldback overcurrent protection, output under/overvoltage protections (UV/OVP), and thermal shutdown (TSD). In addition, the output is protected from a short-to-battery event, which is a critical feature when driving loads connected via a wiring harness.

The A4480KLJTR-T device is available in an 8-pin eSOIC package with exposed pad for enhanced thermal dissipation. It is lead (PB) free, with 100% matt tin leadframe plating.

Please click here to download a copy of the A4480 wide input voltage regulator datasheet.



Allegro MicroSystems is redefining the future of power and sensing technologies. From green energy to advanced mobility and motion control systems, our team is passionate about developing intelligent solutions that move the world forward and give our customers a competitive edge. With global engineering, manufacturing and support, Allegro is a trusted partner to both large enterprises and regional market leaders worldwide. Visit www.allegromicro.com.


Editorial Contact:

Nicole Bump
Senior Manager, Marketing Communication
Tel: (603) 314-1586
nbump@allegromicro.com
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