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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 / 62 page  LM5145-Q1 Automotive 75-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range 1 Features • AEC-Q100 qualified for automotive applications: – Device temperature grade 1: –40°C to +125°C ambient temperature range • Functional Safety-Capable – Documentation available to aid functional safety system design • Versatile synchronous buck DC/DC controller – Wide input voltage range of 5.5 V to 75 V – 150°C maximum junction temperature – 0.8-V reference with ±1% feedback accuracy – Adjustable output voltage from 0.8 V to 60 V – 40-ns tON(min) for high VIN / VOUT ratio – 140-ns tOFF(min) for low dropout – Lossless RDS(on) or shunt current sensing – Optimized for CISPR 25 Class 5 requirements • Switching frequency from 100 kHz to 1 MHz – 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 • Create a custom design using the LM5145-Q1 with WEBENCH® Power Designer 2 Applications • High-power automotive DC/DC regulator • Automotive motor drives, ADAS • HEV/EV powertrain systems • Body electronics and lighting • Infotainment and cluster 3 Description The LM5145-Q1 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-Q1 continues to operate during input voltage dips as low as 5.5 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-power automotive DC/DC regulators, automotive motor drives, and HEV/EV power compliant to LV-148. 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. Device Information PART NUMBER PACKAGE(1) BODY SIZE (NOM) LM5145-Q1 VQFN (20) 4.50 mm × 3.50 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Application Circuit and Efficiency Performance, VOUT = 12 V, FSW = 400 kHz LM5145-Q1 SNVSBU9 – JUNE 2021 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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