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).