LM5143A-Q1 Series

Automotive, 3.5-V to 65-V low-IQ, dual output, stackable synchronous buck DC-DC controller

Catalog

Automotive, 3.5-V to 65-V low-IQ, dual output, stackable synchronous buck DC-DC controller

Part	Topology	Control Features	Package / Case	Supplier Device Package	Function	Output Phases	Operating Temperature [Max]	Operating Temperature [Min]	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Configuration	Clock Sync	Mounting Type	Number of Outputs	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Synchronous Rectifier	Output Type
Texas Instruments LM5143QRHARQ1	Buck	Current Limit Dead Time Control Enable Frequency Control Power Good Soft Start Tracking	40-VFQFN Exposed Pad	40-VQFN (6x6)	Step-Down	2	150 °C	-40 °C	100 kHz	2.2 MHz	Positive		Surface Mount Wettable Flank	2	65 V	3.5 V		Transistor Driver

Catalog

Automotive, 3.5-V to 65-V low-IQ, dual output, stackable synchronous buck DC-DC controller

Key Features

• AEC-Q100 qualified for automotive applications:Device temperature grade 1: –40°C to +125°C ambient operating temperatureFunctional 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 temperature3.3-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/VOUTratio60-ns tOFF(min)for low dropoutInherent protection features for robust designHiccup mode overcurrent protectionIndependent ENABLE and PGOOD functionsAdjustable output voltage soft startVCC, VDDA, and gate-drive UVLO protectionThermal shutdown protection with hysteresisOptimized for CISPR 25 class 5EMI 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 modesVQFN-40 package with wettable flank pinsCreate a custom design using the LM5143A-Q1 withWEBENCH Power DesignerAEC-Q100 qualified for automotive applications:Device temperature grade 1: –40°C to +125°C ambient operating temperatureFunctional 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 temperature3.3-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/VOUTratio60-ns tOFF(min)for low dropoutInherent protection features for robust designHiccup mode overcurrent protectionIndependent ENABLE and PGOOD functionsAdjustable output voltage soft startVCC, VDDA, and gate-drive UVLO protectionThermal shutdown protection with hysteresisOptimized for CISPR 25 class 5EMI 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 modesVQFN-40 package with wettable flank pinsCreate a custom design using the LM5143A-Q1 withWEBENCH Power Designer

Description

The LM5143A-Q1 is a 65-V DC/DC synchronous buck controller for high-current single or dual outputs. Deriving from a family of wide-VINrange 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 LM5143A-Q1 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 automotive systems. Power the LM5143A-Q1 from the output of the switching regulator or another available source for even lower input quiescent current and power loss. The LM5143A-Q1 is a 65-V DC/DC synchronous buck controller for high-current single or dual outputs. Deriving from a family of wide-VINrange 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 LM5143A-Q1 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 automotive systems. Power the LM5143A-Q1 from the output of the switching regulator or another available source for even lower input quiescent current and power loss.