LMR38025SQDRRRQ1

The LMR38025-Q1 synchronous buck converter is designed to regulate over a wide input voltage range, minimizing the need for external surge suppression components. The LMR38025-Q1 operates during input voltage dips as low as 4.2V, at nearly 100% duty cycle if needed, making the device an excellent choice for 48V battery automotive applications and MHEV/EV systems as the absolute maximum input voltage is 85V. The LMR38025-Q1 features a high voltage enable pin to enable the device by connecting the device to the wide input supply voltage or by having precise UVLO control across start-up and shutdown. The powergood flag, with built-in filtering and delay, offers a true indication of system status, eliminating the need for an external supervisor. The device incorporates pseudorandom spread spectrum option for minimal EMI. The switching frequency can be configured between 200kHz and 2.2MHz to avoid noise sensitive frequency bands. In addition, the frequency can be programmed through the RT pin for improved efficiency at low operating frequencies or by having a smaller design size at high operating frequencies. The device has built-in protection features such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation. The LMR38025-Q1 is qualified to automotive AEC-Q100 grade 1 and is available in a 12-pin WSON package.

Applications

• Automotive inverter and motor control
• Automotive DC/DC converters
• Automotive battery management system
• Automotive 48V mild hybrid ECU bias supplies

Key features

• AEC-Q100 qualified for automotive applications – Temperature grade 1: -40°C to +150°C, TJ
• Functional Safety-Capable Documentation available to aid functional safety system design
• Designed for Low EMI requirements
• Spread spectrum option for reduced peak emissions
• Low package parasitics facilitating CIPR25 class 5 compliance
• Configured for rugged automotive applications – 4.2V to 80V input voltage range
• 2.5A continuous output current
• Ultra-low 40μA operating quiescent current
• 200kHz to 2.2MHz adjustable switching frequency
• Frequency synchronization to external clock
• 97% maximum duty cycle
• Supports start-up events with prebiased output
• ±1.5% reference voltage tolerance over temperature
• Precision enable
• Easy to use with integrated compensation network enabling low BOM count
• Integrated synchronous rectification
• 12-pin WSON wettable flank with PowerPAD integrated circuit package
• PFM and forced PWM (FPWM) options