LMR43610-Q1 : Automotive 3-V to 36-V, 1-A, low-IQ, low EMI synchronous buck regulator

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 1 mA 

– 1.2-µA total non-switching IQ at 13.5 VIN, fixed 3.3 VOUT • Miniature solution size and low component cost 

– 2-mm × 2-mm 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

The LMR436x0-Q1 is the industry's smallest 36-V, 2-A and 1-A synchronous step-down DC/DC converters in a 2-mm × 2-mm HotRod package. 

This easy-to-use converter supports a wide input voltage range of 3.0 V to 36 V with transients up to 42 V. 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 1.5 µA at 13.5 VIN 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 optimized for an ultra-small solution size. The device uses peak current mode control to minimize output capacitance. The LMR436x0-Q1 minimizes input filter size by utilizing 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 200 kHz and 2.2 MHz 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.