Quality Standards and Environmental Certifications

A4450: Buck-Boost Controller with Integrated Buck MOSFET

A4450 Product image

A4450 Datasheet
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Description

Top Features

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

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Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant 		Part Composition /
RoHS Data 		Comments Samples Check Stock
APEK4450KES-HF5V-MH DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep		 Check
Distributor Stock
APEK4450KES-HF8V-MH DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep		 Check
Distributor Stock
APEK4450KES-LF5V-MH DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep		 Check
Distributor Stock
APEK4450KES-LF8V-MH DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep		 Check
Distributor Stock
A4450KESTR-J 20-lead QFN -40°C to 150°C Yes View Data Contact your
local sales rep		 Check
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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

Packaging

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

Design Support Tools

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