1 Features

• AEC-Q100-qualified for automotive applications:

– Temperature grade 1: –40°C to +125°C, TA

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Greater than 85% efficiency at 1mA

– 1.2μA total non-switching IQ at 13.5VIN, fixed

3.3VOUT

• Miniature design size and low component cost

– 2mm × 2mm HotRod™ package with wettable

flanks

– Internal compensation

• Optimized for ultra-low EMI requirements

– Spread spectrum reduces peak emissions

– Meets CISPR25 Class 5 standard

– Pin selectable FPWM mode for constant

frequency at light loads with MODE/SYNC pin

– FSW synchronization with MODE/SYNC pin

• Designed for automotive applications

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

– Supports 42V automotive load dump

– Supports 3VIN for automotive cold crank

– Adjustable up to 95% of VIN, 3.3V and 5V fixed

VOUT options available

• Designed for scalable power supplies

– 200kHz to 2.2MHz (RT pin) adjustable FSW

– Pin compatible with:

• LMR36506-Q1 (65V, 600mA)

• LMR36503-Q1 (65V, 30mA)

2 Applications

• Advanced driver assistance systems: radar ECU

• Infotainment and cluster: head unit, eCall

• Body electronics and lighting

3 Description

The LMR436x0-Q1 is the industry smallest 36V, 2A,

and 1A synchronous step-down DC/DC converters in

a 2mm × 2mm HotRod package. This easy-to-use

converter supports a wide input voltage range of 3.0V

to 36V with transients up to 42V.

The LMR43620-Q1 is specifically designed to

meet low standby power requirements for always

on, automotive applications. Auto mode enables

frequency foldback when operating at light loads,

allowing an unloaded current consumption of 1.5μA

at 13.5VIN and high light load efficiency. A seamless

transition between PWM and PFM modes along

with very low MOSFET ON resistances provide

exceptional efficiency across the entire load range.

The control architecture and feature set are designed

for an ultra-small design size. The device uses peak

current mode control to minimize output capacitance.

The LMR436x0-Q1 minimizes input filter size by using

dual random spread spectrum, a low-EMI HotRod

package, and an optimized pinout. The MODE/SYNC

and RT pin variants can be used to set or synchronize

the frequency between 200kHz and 2.2MHz to avoid

noise sensitive frequency bands.

The rich feature set of the LMR436x0-Q1 is designed

to simplify implementation for a wide range of

automotive end equipments.