Texas Instruments LM5148

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.

Features

Integrated EMI mitigationSelectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bandsOptimized for CISPR 32 Class B requirementsVersatile synchronous buck DC/DC controllerWide input voltage range of 3.5 V to 80 V1% accurate, fixed 3.3 V, 5 V, 12 V, or adjustable output from 0.8 V to 55 V150°C maximum junction temperatureLossless DCR or shunt current sensingShutdown mode current of 2.3 µANo-load sleep current of 9.5 µAInternal soft-start ramp of 3 msStackable up to two phasesInternal bootstrap diodeSwitching frequency from 100 kHz to 2.2 MHzSYNC in and SYNC out capabilitySelectable PFM or FPWM modesInherent protection features for robust designInternal hiccup mode overcurrent protectionENABLE and PGOOD functionsVCC, VDDA, and gate-drive UVLO protectionInternal or external loop compensationThermal shutdown protection with hysteresis

Typical applications

• Building automation
• Test and measurement
• Power delivery
• Aerospace and defense
• Industrial transport

More information

• Datasheet
• IC product information