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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 t_ON(min) for a high V_IN/V_OUT ratio
- 145ns t_OFF(min) for low dropout
- Lossless R_DS(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 V_TH 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
- V_CC 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

Texas Instruments LV5144 95V Synchronous Buck Controller

Features

Applications

Functional Block Diagram

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