Texas Instruments LMR36503-Q1 Handleiding

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LMR36503-Q1 3-V to 65-V, 0.3-A Synchronous Buck Converter Optimized for Size and

Light Load Efficiency

1 Features

•AEC-Q100-qualified for automotive applications:

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

T

A

•Functional Safety-Capable

–Documentation available to aid functional safety

system design

•>70% efficiency at 5 mA

–4 µA I

Q

(switching) at 24 V

IN

to 3.3 V

OUT

(fixed

output option)

•Miniature solution size and low component cost

–2-mm × 2-mm HotRod

™

package with wettable

flanks

–Internal compensation

•Designed for automotive applications:

–Junction temperature range –40°C to +150°C

–Pseudo-random spread spectrum compatible

with CISPR 25 EMI standard

–Wide input voltage range: 3.0 V (falling

threshold) to 65 V

–Adjustable, 3.3-V and 5-V fixed output voltage

options available

–Synchronizable with MODE/SYNC pin variant

–Adjustable F

SW

: 200 kHz to 2.2 MHz with RT

pin variant

–Pin compatible with LMR36506-Q1 (65 V, 600

mA)

2 Applications

•Advanced driver assistance systems (ADAS)

•Body electronics and lighting

•Infotainment and cluster

3 Description

The LMR36503-Q1 is the industry's smallest 65 V,

0.3 A synchronous step-down DC/DC converter in

2-mm x 2-mm HotRod

™

package. This easy-to-use

converter can handle input voltage transients up to

70 V, provide excellent EMI performance and support

fixed 3.3 V, 5 V and other adjustable output voltages.

The LMR36503-Q1 uses peak current mode control

architecture with internal compensation and maintains

stable operation with minimal output capacitance.

The wide input operating range of the LMR36503-

Q1 helps it remain functional during a deep input

voltage sag condition, making it an excellent choice

for automotive applications withstanding severe cold

crank start impulses. The PGOOD flag in the

LMR36503-Q1 provides precise indication of the

output voltage status, eliminating the requirement for

an external supervisor. A seamless transition from

FPWM to PFM, with an ultra-low standby quiescent

current allows the LMR36503-Q1 to support much

higher system efficiency at low output loads. The

MODE/SYNC pin variant helps to synchronize the

LMR36503-Q1 to an external clock. With the right

resistor selection, the LMR36503-Q1 RT pin variant

can also be externally programmed to any desired

switching frequency of operation. The rich feature

set of the LMR36503-Q1 is designed to simplify

implementation for a wide range of automotive end

equipments.

Device Information

PART NUMBERPACKAGE

(1)

BODY SIZE (NOM)

LMR36503-Q1VQFN-HR (9)2.00 mm × 2.00 mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

V

IN

VIN

EN/

UVLO

BOOT

SW

FB

GND

V

OUT

C

BOOT

L

IND

C

IN

C

OUT

R

FBT

R

FBB

VCC

PGOOD

C

VCC

MODE/

SYNC

Simplified Schematic

Load Current (A)

Efficiency (%)

0

10

20

30

40

50

60

70

80

90

100

10P100P1m10m100m

LMR3

V

IN

= 8V

V

IN

= 13.5V

V

IN

= 24V

V

IN

= 48V

Efficiency versus Output Current V

OUT

= 3.3 V

(Fixed), 2.2 MHz

LMR36503-Q1

SNVSBB5B – SEPTEMBER 2019 – REVISED SEPTEMBER 2020

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.

Product specificaties