Texas Instruments LM5143

Description

The LM5143 is a 65-V DC/DC synchronous buck controller for high-current single or dual outputs. Deriving from a family of wide-VIN range controllers, the device uses an interleaved, stackable, peak current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with paralleled phases for higher output current. A high-side switch minimum on time of 65 ns provides large step-down ratios, enabling the direct conversion from 12-V, 24-V, or 48-V inputs to low-voltage rails for reduced system complexity and cost. The LM5143 continues to operate during input voltage dips as low as 3.5 V, at nearly 100% duty cycle if needed.The 15-µA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered systems. Power the LM5143 from the output of the switching regulator or another available source for even lower input quiescent current and power loss.

Features

Functional Safety-CapableDocumentation available to aid functional safety system designVersatile synchronous buck DC/DC controllerWide input voltage range of 3.5 V to 65 V1% accurate, fixed 3.3-V, 5-V, or adjustable outputs from 0.6 V to 55 V150°C maximum junction temperature4-µA typical shutdown mode current15-µA typical no-load standby currentTwo interleaved synchronous buck channelsDual channel or single-output multiphase65-ns tON(min) for high VIN/VOUT ratio60-ns tOFF(min) for low dropoutInherent protection features for robust designShunt or inductor DCR current sensingHiccup mode overcurrent protectionIndependent ENABLE and PGOOD functionsAdjustable output voltage soft startVCC, VDDA, and gate-drive UVLO protectionThermal shutdown protection with hysteresisOptimized for CISPR 11 and CISPR 32 class B conducted and radiatedEMI requirementsSlew-rate controlled adaptive gate driversSpread spectrum reduces peak emissions100-kHz to 2.2-MHz switching frequencySYNC in and SYNC out capabilitySelectable diode emulation or FPWM modes6-mm × 6-mm VQFN-40 packageCreate a custom design using the LM5143 with WEBENCH Power Designer

Typical applications

• Enterprise systems: high-performance computing
• Industrial: factory automation and control, robotics
• Communications systems: wireless infrastructure, remote radio unit (RRU)

More information

• Datasheet
• IC product information