Texas Instruments LMR38025/LMR38025-Q1 Synchronous Buck Converter
Texas Instruments LMR38025/LMR38025-Q1 Synchronous Buck Converter is designed to regulate over a wide input voltage range, minimizing the use of external surge-suppression components. This converter operates at a 4.2V to 80V input voltage range with a 97% maximum duty cycle and a spread spectrum option for reduced peak emissions. The LMR38025/LMR38025-Q1 buck converter delivers up to 2.5A continuous output current, 200kHz to 2.2MHz adjustable switching frequency, and ultra-low 40µA operating quiescent current. This converter features a high-voltage enable-pin to facilitate the device by connecting it to the wide input-supply voltage or precise UVLO control across start-up and shutdown. The LMR38025/LMR38025-Q1 buck converter incorporates a power-good flag function with a built-in filter and delay. This power-good flag function properly indicates system status and eliminates the need for an external supervisor.
The LMR38025/LMR38025-Q1 buck converter also features a cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation. Typical applications include automotive inverter and motor control, automotive DC/DC converters, automotive battery management systems, and automotive 48V mild hybrid ECU bias supplies. The LMR38025-Q1 is AEC-Q100 grade 1 automotive qualified for automotive applications.
Features
- Configured for rugged automotive applications:
- 4.2V to 80V input voltage range
- 2.5A continuous output current
- 40µA ultra-low operating quiescent current
- 200kHz to 2.2MHz adjustable switching frequency range
- Frequency synchronization to an external clock
- 97% maximum duty cycle
- Supports start-up events with pre-biased 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
- Functional safety-capable:
- Documentation available to aid functional safety system design
- Optimized for low EMI requirements:
- Spread spectrum option for reduced peak emissions
- Low package parasitics facilitating CIPR25 class 5 compliance
- Documentation available to aid functional safety system design
Applications
- Automotive inverter and motor control
- Automotive DC/DC converters
- Automotive battery management system
- Automotive 48V mild hybrid ECU bias supplies
Datasheets
Functional Block Diagram
Related Evaluation Module
Texas Instruments LMR38025QEVM Evaluation Module
Uses an LMR38025SQDRRRQ1 synchronous buck converter with a wide duty-cycle range.
Additional Resource
Yayınlandı: 2024-01-10
| Güncellenmiş: 2025-05-06