A4450 Datasheet, PDF (1/34 Pages) Allegro MicroSystems – Buck-Boost Controller with Integrated Buck MOSFET

A4450
Buck-Boost Controller with Integrated Buck MOSFET
FEATURES AND BENEFITS
• Automotive AEC-Q100 qualified
• Wide operating range of 3 to 36 V_IN, 40 V_IN maximum,
covers automotive stop/start, cold crank, double battery,
and load dump
• Regulated output can range from 3 to 8 V at up to 1 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
PACKAGES:
20-pin 4 × 4 mm QFN (ES) with wettable flank
Not to scale
DESCRIPTION
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.
APPLICATIONS
• Infotainment
• Instrument Clusters
• Control Modules
VBAT
VIN
A4450-DS
VIN
VIN
AVIN
COMP
A4450
FSET /SYNC
SS
EN
BOOT
LX
LX
LG
FB
RNG
NPOR
GND
PGND
D1
Buck
Diode
Typical Application Diagram
D2 Boost
Diode
VOUT