LM5143 Series

3.5-V to 65-V, dual-output, stackable, synchronous buck DC/DC controller with ultra-low IQ

Catalog

3.5-V to 65-V, dual-output, stackable, synchronous buck DC/DC controller with ultra-low IQ

Part	Number of Outputs	Package / Case	Control Features	Clock Sync	Function	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Phases	Operating Temperature [Max]	Operating Temperature [Min]	Mounting Type	Topology	Output Type	Duty Cycle (Max) [Max]	Synchronous Rectifier	Supplier Device Package	Output Configuration	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Frequency - Switching	Main Purpose	Current - Output	Voltage - Output	Voltage - Input [Min]	Voltage - Input [Max]	Utilized IC / Part	Regulator Topology	Supplied Contents	Outputs and Type	Outputs and Type	Board Type
Texas Instruments LM5143RHAR	2	40-VFQFN Exposed Pad	Current Limit Enable Frequency Control Phase Control Power Good Soft Start		Step-Down	100 kHz	2.2 MHz	2	150 °C	-40 °C	Surface Mount	Buck	Transistor Driver	100 %		40-VQFN (6x6)	Positive	65 V	3.5 V
Texas Instruments LM5143-Q1EVM-2100																				2.1 MHz	DC/DC Step Down	7 A	3.3 V 5 V	5.5 V	36 V	LM5143-Q1	Buck	Board(s)	2	Non-Isolated	Fully Populated

Catalog

3.5-V to 65-V, dual-output, stackable, synchronous buck DC/DC controller with ultra-low IQ

Key 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/VOUTratio60-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 withWEBENCH Power DesignerFunctional 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/VOUTratio60-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 withWEBENCH Power Designer

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-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 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. The LM5143 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 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.