1 Features

? AEC-Q100 qualified for automotive applications

– Device temperature grade 1: –40°C to +125°C

ambient operating temperature

? Functional Safety-Capable

– Documentation available to aid functional safety

system design

? 5.5-V to 36-V wide input voltage range

? Up to 5-A continuous (6-A peak) output current

? High efficiency greater than 90 enabled by 85-

mΩ integrated MOSFET switch

? Wide output voltage range: adjustable down to

1.22 V with 1.5 initial accuracy

? Internal compensation minimizes external part

count

? Fixed 400-kHz below MW band switching

frequency

? 13-μA typical shutdown supply current

? Improved line regulation and transient response by

input voltage feedforward

? System protected by overcurrent limiting,

overvoltage protection, and thermal shutdown

? –40°C to 150°C operating junction temperature

range

? Available in small thermally enhanced 8-pin SOIC

PowerPAD? integrated circuit package

2 Applications

? Infotainment and cluster

? Body electronics and lighting

? Battery chargers

3 Description

The LMR54450-Q1 and LMR54430-Q1 are highoutput-

current PWM converters that integrates a lowresistance,

high-side N-channel MOSFET. Integrated

features include a high-performance error amplifier

that provides tight voltage regulation accuracy under

transient conditions, an undervoltage-lockout circuit

to prevent start-up until the input voltage reaches

5.5-V, an internally set soft-start circuit to limit

inrush currents, and a voltage feedforward circuit

to improve the transient response. Using the EN

pin, shutdown supply current is reduced to 13

μA typically. Other features include an active-high

enable, overcurrent limiting, overvoltage protection,

and thermal shutdown. To reduce design complexity

and external component count, the feedback loop is

internally compensated.

LMR54450-Q1 and LMR54430-Q1 devices are

available in a thermally enhanced, 8-pin SOIC

PowerPAD integrated circuit package. TI provides

evaluation modules and software tool to aid in

achieving high-performance power supply designs to

meet aggressive equipment development cycles.