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LM5145 Datasheet(PDF) 1 Page - Texas Instruments |
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LM5145 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 60 page  LV5144 95-V, Synchronous, Buck DC/DC Controller With Wide Duty Cycle Range 1 Features • – Device temperature grade 1: –40°C to +125°C ambient temperature range • Versatile synchronous buck DC/DC controller – 6-V to 95-V wide input voltage range – 125°C maximum junction temperature – 0.8-V reference with ±1% feedback accuracy – 0.8-V to 60-V adjustable output voltage – 45-ns tON(min) for high VIN / VOUT ratio – 145-ns tOFF(min) for low dropout – Lossless RDS(on) or shunt current sensing – Optimized for CISPR 11 and CISPR 32 Class B EMI requirements • 100-kHz to 1-MHz switching frequency – SYNC in and SYNC out capability – Selectable diode emulation or FPWM • 7.5-V gate drivers for standard VTH MOSFETs – 14-ns adaptive dead-time control – 2.3-A source and 3.5-A 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 2 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 3 Description The LV5144 95-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 45 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 design cost. The LV5144 continues to operate during input voltage dips as low as 6 V, 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 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications. Package Information PART NUMBER PACKAGE(1) PACKAGE SIZE(2) LV5144 RGY (VQFN, 20) 4.50 mm × 3.50 mm (1) For all available packages, see the order able addendum at the end of the data sheet. (2) The package size (length × width) is nominal value and includes pine, where applicable. BST HO SW VCC PGND RT SS/TRK COMP FB AGND V IN V OUT LV5144 V OUT SYNC In GND PG SYNCOUT SYNCIN EN/UVLO VIN ILIM PGOOD SYNC Out LO L F C OUT Q 1 Q 2 C IN R ILIM C VCC C BST C SS R FB2 R FB1 R C2 C C2 C C1 R C1 C C3 R RT EN V IN Typical Application Circuit and Efficiency Performance, VOUT = 12 V, FSW = 400 kHz LV5144 SNVSCJ1 – AUGUST 2023 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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