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1 Features

? AEC-Q100 qualified for automotive applications:

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

? Functional Safety-Compliant

– Developed for functional safety applications

– Documentation available to aid ISO 26262

system design planned

– Systematic capability up to ASIL D

– Hardware capability up to ASIL C

– Analog built-in-self-test at start-up

– Redundant and fast (0.35μs) VOUT monitor

– Excellent pin FMEA and pin spacing

? Wide input voltage range: 3V to 70V

? 1% accurate, VOUT from 0.8V to 60V

? Optimized for low EMI requirements

– Facilitates CISPR 25 Class 5 compliance

– Pin-configurable dual-random spread spectrum

and slew-rate control reduce peak emissions

– Enhanced HotRod? QFN package with

symmetrical pinout

– Switching frequency from 300kHz to 2.2MHz

– Pin-configurable AUTO or FPWM operation

? Low minimum on time: 36ns (typical)

– Enables 36V to 3.3V conversion at 2.1MHz

? High-efficiency power conversion

– > 95% peak efficiency, 12VIN to 5VOUT, 400kHz

– No-load input current: 3.5μA

? High power density

– Internal compensation, OCP, and TSD

– 4.5mm × 4.5mm eQFN-26 with wettable flanks

– ΘJA = 18°C/W (EVM)

? VIN to PGND pin clearance: 1.1mm

2 Applications

? Advanced Driver Assistance Systems (ADAS)

? Automotive infotainment and cluster

? Hybrid, electric, and powertrain systems

3 Description

The LM686x0-Q1 are a family of stackable,

automotive buck converters designed for high

efficiency, high power density, and ultra-low

electromagnetic interference (EMI). The converters

operate over a wide input voltage range of 3V to 70V

simplifying input surge protection design.

The low EMI operation is enabled with minimized loop

inductance, internal bypass capacitors, pin-selectable

SW node slew-rate control and dual-random spread

spectrum (DRSS).

The current-mode control architecture with 36ns

minimum on-time allows high conversion ratios at high

frequencies, easy loop compensation, fast transient

response, and excellent load and line regulation. Up

to two converters can be set up in an interleaved

mode (paralleled outputs) with accurate current

sharing for supporting output current up to 16A.

The LM686x0-Q1 buck converters are specifically

intended for functional safety relevant applications.

An array of safety features including ABIST at

start-up, redundant and fast VOUT monitor, feedback

path failure detection, redundant temperature sensor,

thermal shutdown, and current limit significantly

reduces residual failure-in-time (FIT).