Texas Instruments LMR51440-Q1 Bedienungsanleitung

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LMR514x0-Q1 36V, 4A / 5A , Automotive, Synchronous Buck Converter With Low I

Q

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

•Supports automotive system requirements:

–Wide input voltage range: 4V to 36V

–4A or 5A continuous output current

–±1.0% tolerance voltage reference at room

temperature

–Minimum switching-on time: 75ns (typical)

–Low quiescent current: 25µA

–Adjustable frequency: 200kHz to 1MHz

–Frequency spread spectrum

–Protection features:

•Precision enable input

•Open-drain PGOOD

•V

IN

undervoltage lockout (UVLO)

•Cycle-by-cycle current limiting

•Short-circuit protection with hiccup mode

•Thermal shutdown

•Small design size and ease of use

–Integrated synchronous rectification

–Internal compensation for ease of use

–WSON-12 package

•PFM and FPWM options in pin-to-pin compatible

package

•Create a custom design using the LMR514x0-Q1

with the WEBENCH

®

Power Designer

2 Applications

•Automotive ADAS and body electronics

•Automotive infotainment and cluster: head unit,

media hub, USB charge, display

3 Description

The LMR514x0-Q1 is a wide-V

IN

, easy-to-use,

synchronous buck converter capable of driving up to

4A or 5A load current. With a wide input range of 4V

to 36V, the device is designed for a wide range of

industrial applications for power conditioning from an

unregulated source.

The LMR514x0-Q1 features adjustable switching

frequency from 200kHz to 1MHz with an external

resistor, which provides the flexibility to optimize either

efficiency or external component size. The device

has pulse frequency modulation (PFM version) to

realize high efficiency at light load, and forced pulse

width modulation (FPWM version) to achieve constant

frequency, and small output voltage ripple over the full

load range. Soft-start and compensation circuits are

implemented internally, which allows the device to be

used with minimum external components.

The device has built-in protection features, such as

cycle-by-cycle current limit, hiccup mode short-circuit

protection, and thermal shutdown in case of excessive

power dissipation. The LMR514x0-Q1 is available in a

WSON-12 package.

Device Information

PART

NUMBER

(1)

CURRENTPACKAGE

(2)

BODY SIZE

(NOM)

LMR51440-Q14A

DRR (WSON,

12)

3.00mm ×

3.00mm

LMR51450-Q15A

(1)See the Device Comparison Table.

(2)For more information, see Section 11.

Simplified Schematic

I

OUT

(A)

Efficiency(%)

0.0010.010.020.050.10.20.5123455

0

10

20

30

40

50

60

70

80

90

100

PFM,V

IN

=12V

PFM,V

IN

=24V

FPWM,V

IN

=12V

FPWM,V

IN

=24V

Efficiency vs Output Current V

OUT

= 5V, 400kHz

LMR51440-Q1, LMR51450-Q1

SLUSFM2 – AUGUST 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Produktspezifikationen