Texas Instruments LV5144 95V Synchronous Buck Controller
Texas Instruments LV5144 95V Synchronous Buck Controller regulates from a high input voltage source or an input rail subject to high-voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 45ns gives large step-down ratios, enabling the direct step-down conversion from a 48V nominal input to low-voltage rails for reduced system complexity and design cost. The Texas Instruments LV5144 continues to operate during input voltage dips as low as 6V, at nearly 100% duty cycle if needed, making an excellent choice for high-performance industrial controls, robotics, datacom, and RF applications.
Forced-PWM (FPWM) operation eliminates switching frequency variation to minimize EMI, while user-selectable diode emulation lowers current consumption at light-load conditions. The adjustable switching frequency as high as 1MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications.
Features
- Device temperature grade 1 (–40°C to +125°C ambient temperature range)
- Versatile synchronous buck DC/DC controller
- 6V to 95V wide input voltage range
- 125°C maximum junction temperature
- 0.8V reference with ±1% feedback accuracy
- 0.8V to 60V adjustable output voltage
- 45ns tON(min) for a high VIN/VOUT ratio
- 145ns tOFF(min) for low dropout
- Lossless RDS(on) or shunt current sensing
- Optimized for CISPR 11 and CISPR 32 Class B EMI requirements
- 100kHz to 1MHz switching frequency
- SYNC in and SYNC out capability
- Selectable diode emulation or FPWM
- 7.5V gate drivers for standard VTH MOSFETs
- 14ns adaptive dead-time control
- 2.3A source and 3.5A sink capability
- Inherent protection features for robust design
- Adjustable output voltage soft start
- Hiccup-mode overcurrent protection
- Input UVLO with hysteresis
- VCC and gate-drive UVLO protection
- Precision enable input and open-drain PGOOD indicator for sequencing and control
- Thermal shutdown protection with hysteresis
- 20-pin VQFN package with wettable flanks
Applications
- Wireless infrastructure, cloud computing
- Industrial motor drives, test and measurement
- Personal transport vehicle: electric bike
- Asset tracking and fleet management systems
- Non-isolated PoE, IP cameras
- Inverting buck-boost regulators
Functional Block Diagram
Related Development Tool
Texas Instruments LM5146-Q1-EVM12V Controller EVM
Designed to showcase the performance of the LM5146-Q1, a synchronous buck DC-DC buck controller.
Published: 2023-10-26
| Updated: 2023-11-02