LM5145 Series
75V Synchronous Buck Controller With Wide Input Voltage and Duty Cycle Ranges
Manufacturer: Texas Instruments
Catalog
75V Synchronous Buck Controller With Wide Input Voltage and Duty Cycle Ranges
Key Features
• Versatile synchronous buck DC/DC controllerWide input voltage range of 6 V to 75 V0.8-V reference with ±1% feedback accuracyAdjustable output voltage from 0.8 V to 60 V40-ns tON(min)for high VIN/ VOUTratio140-ns tOFF(min)for low dropoutOptimized for CISPR 32 requirementsSwitching frequency from 100 kHz to 1 MHzSYNC In and SYNC Out capabilitySelectable diode emulation or FPWM7.5-V gate drivers for standard VTHMOSFETs14-ns adaptive dead-time control2.3-A source and 3.5-A sink capabilityLow-side soft start for prebiased start-upFast line and load transient responseVoltage-mode control with line feedforwardHigh gain-bandwidth error amplifierInherent protection features for robust designAdjustable output voltage soft startHiccup-mode overcurrent protectionInput UVLO with hysteresisVCC and gate-drive UVLO protectionPrecision enable input and open-drain PGOOD indicator for sequencing and controlThermal shutdown protection with hysteresis20-pin VQFN package with wettable flanksCreate a custom design using the LM5145 withWEBENCH Power DesignerVersatile synchronous buck DC/DC controllerWide input voltage range of 6 V to 75 V0.8-V reference with ±1% feedback accuracyAdjustable output voltage from 0.8 V to 60 V40-ns tON(min)for high VIN/ VOUTratio140-ns tOFF(min)for low dropoutOptimized for CISPR 32 requirementsSwitching frequency from 100 kHz to 1 MHzSYNC In and SYNC Out capabilitySelectable diode emulation or FPWM7.5-V gate drivers for standard VTHMOSFETs14-ns adaptive dead-time control2.3-A source and 3.5-A sink capabilityLow-side soft start for prebiased start-upFast line and load transient responseVoltage-mode control with line feedforwardHigh gain-bandwidth error amplifierInherent protection features for robust designAdjustable output voltage soft startHiccup-mode overcurrent protectionInput UVLO with hysteresisVCC and gate-drive UVLO protectionPrecision enable input and open-drain PGOOD indicator for sequencing and controlThermal shutdown protection with hysteresis20-pin VQFN package with wettable flanksCreate a custom design using the LM5145 withWEBENCH Power Designer
Description
AI
The LM5145 75-V synchronous buck controller regulates from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns gives large step-down ratios, enabling the direct step-down conversion from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5145 continues to operate during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance industrial control, robotic, datacom, and RF power 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 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications.
The LM5145 75-V synchronous buck controller regulates from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns gives large step-down ratios, enabling the direct step-down conversion from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5145 continues to operate during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance industrial control, robotic, datacom, and RF power 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 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications.
