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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  LM25139 42V, Synchronous Buck DC/DC Controller With Dual Random Spread Spectrum for Advanced EMI Mitigation 1 Features • Versatile synchronous buck DC/DC controller – 4V to 42V wide input voltage range – Fixed 3.3V, 5V or adjustable output voltage from 0.8V to 36V – –40°C to 150°C junction temperature range – Integrated high-current MOSFET gate drivers with 1.65A source and 2.4A sink capability – Lossless inductor DCR or shunt current sensing – 25ns tON(min) for high VIN to VOUT conversion – 80ns tOFF(min) for high duty-cycle applications – 10µA no-load sleep quiescent current – 2.3µA shutdown quiescent current • Optimized for CISPR 25 Class 5 EMI requirements – Dual Random Spread Spectrum (DRSS) with 5% or 10% frequency modulation – 100kHz to 3.2MHz switching frequency – Optional synchronization to an external clock – Selectable PFM or FPWM operation • Inherent protection features for robust design – Hiccup-mode overcurrent protection – Precision enable input and open-drain PGOOD indicator for sequencing and control – VCC and gate-drive UVLO protection – Fixed 3ms output voltage soft start – Thermal shutdown protection with hysteresis • 16-pin, 3mm × 3mm package with wettable flanks • Create a custom design using the LM25139 device with the WEBENCH® Power Designer 2 Applications • Personal electronics: computer peripherals • Industrial: 24V bus systems, power delivery • Enterprise systems: high-performance computing 3 Description The LM25139 is a 42V, synchronous, buck DC/DC controller with ultra-low IQ for single-output, high- current regulator circuits. Deriving from a family of wide-VIN range controllers, the device uses a peak current-mode control architecture for fast transient response, convenient loop compensation, and excellent load and line regulation performance. A high-side switch minimum on time of 25ns provides large step-down ratios, enabling the direct conversion from 12V and 24V inputs to low-voltage rails for reduced system design cost and complexity. The LM25139 continues to operate during input voltage dips as low as 4V, at nearly 100% duty cycle if needed, making the device an excellent choice for high-performance applications. The LM25139 comes in a thermally enhanced, 16- pin VQFN package with wettable flank pins and an exposed pad to aid in thermal dissipation. Package Information PART NUMBER PACKAGE(1) PACKAGE SIZE(2) LM25139 RGT (VQFN, 16) 3mm × 3mm (1) For more information, see Section 10. (2) The package size (length × width) is a nominal value and includes pins, where applicable. FPWM/SYNC AGND PGND VOUT ISNS LO SW HO CBOOT VIN COMP VCC PG EN RT LM25139 FB R RT R COMP C COMP C HF C VCC C BOOT C IN C OUT R S L O V IN = 4V...36V V OUT = 3.3V SYNC op onal Q 2 Q 1 VCC Typical Schematic Load Current (A) 0 1 2 3 4 5 6 7 8 9 10 11 12 75 80 85 90 95 100 Vin = 8V Vin = 12V Vin = 18V Typical Efficiency, VOUT = 3.3V, FSW = 440kHz LM25139 SLVSJ80 – OCTOBER 2025 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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