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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 / 70 page  LM5148 80-V, Synchronous, Buck DC/DC Controller with Ultra-Low IQ and Dual Random Spread Spectrum 1 Features • Functional Safety-Capable – Documentation available to aid functional safety system design • Integrated EMI mitigation – Selectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bands – Optimized for CISPR 32 Class B requirements • Versatile synchronous buck DC/DC controller – Wide input voltage range of 3.5 V to 80 V – 1% accurate, fixed 3.3 V, 5 V, 12 V, or adjustable output from 0.8 V to 55 V – 150°C maximum junction temperature – Lossless DCR or shunt current sensing – Shutdown mode current of 2.3 µA – No-load sleep current of 9.5 µA – Internal soft-start ramp of 3 ms – Stackable up to two phases – Internal bootstrap diode • Switching frequency from 100 kHz to 2.2 MHz – SYNC in and SYNC out capability – Selectable PFM or FPWM modes • Inherent protection features for robust design – Internal hiccup mode overcurrent protection – ENABLE and PGOOD functions – VCC, VDDA, and gate-drive UVLO protection – Internal or external loop compensation – Thermal shutdown protection with hysteresis • Create a custom design using the LM5148 with WEBENCH® Power Designer 2 Applications • Building automation • Industrial transport • Power delivery • Test and measurement • Aerospace and defense 3 Description The LM5148 is a 80-V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM5148 can be set up in idual-phase mode (paralleled output) with accurate current sharing for high-current applications. It can operate at input voltages as low as 3.5 V, at nearly 100% duty cycle if needed. The LM5148 has a unique EMI reduction feature known as dual random spread spectrum (DRSS). Combining low-frequency triangular and high-frequency random modulations mitigates EMI disturbances across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests. Package Information PART NUMBER PACKAGE(1) BODY SIZE (NOM) LM5148 RGY (VQFN, 24) 3.50 mm × 5.50 mm (1) For all available packages, see the orderable addendum at the end of the data sheet V OUT = 5 V I OUT = 12 A * V OUT tracks VIN if VIN < 5.2 V PFM/SYNCIN AGND PGND ISNS+ CS LO SW HO CBOOT VIN EXTCOMP VCC PGOOD EN VCCX RT VDDA LM5148 FB R T C VDDA C VCC C BOOT C IN C O R S L O CNFG Q 1 Q 2 4 47 F 4 m 2.2 H 0.1 F * Tie to GND if not used 2.2 F V IN = 3.5 V...80 V 49.9 k 0.1 F VDDA R FB 24.9 k Typical Application Schematic CISPR 25 EMI Performance - 150 kHz to 30 MHz LM5148 SNVSC01 – FEBRUARY 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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