LM25148-Q1 Series

Automotive 42-V synchronous buck DC/DC controller with ultra-low IQ

Catalog

Automotive 42-V synchronous buck DC/DC controller with ultra-low IQ

Part	Supplier Device Package [y]	Supplier Device Package	Supplier Device Package [x]	Mounting Type	Number of Outputs	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Topology	Clock Sync	Package / Case	Function	Duty Cycle (Max) [Max]	Output Configuration	Operating Temperature [Min]	Operating Temperature [Max]	Output Phases	Frequency - Switching [Min]	Frequency - Switching [Max]	Synchronous Rectifier	Output Type	Control Features
Texas Instruments LM25148QRGYRQ1	3.5	24-VQFN	5.5	Surface Mount	1	42 V	3.5 V	Buck		24-VFQFN Exposed Pad	Step-Down	100 %	Positive	-40 °C	125 °C	1	100 kHz	2.2 MHz		Transistor Driver	Current Limit Dead Time Control Frequency Control Power Good Ramp Soft Start Sync

Catalog

Automotive 42-V synchronous buck DC/DC controller with ultra-low IQ

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 designIntegrated EMI mitigationSelectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bandsOptimized for CISPR 25 Class 5 requirementsVersatile synchronous buck DC/DC controllerWide input voltage range of 3.5V to 42V1% accurate, fixed 3.3V, 5V, 12V, or adjustable output from 0.8V to 36V150°C maximum junction temperatureShutdown mode current of 2.3µANo-load sleep current of 9.5µAInternal soft-start ramp of 3msStackable up to two phasesInternal bootstrap diodeSwitching frequency from 100kHz to 2.2MHzSYNC in and SYNC out capabilityInherent 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 hysteresisCreate a custom design using the LM25148-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 designIntegrated EMI mitigationSelectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bandsOptimized for CISPR 25 Class 5 requirementsVersatile synchronous buck DC/DC controllerWide input voltage range of 3.5V to 42V1% accurate, fixed 3.3V, 5V, 12V, or adjustable output from 0.8V to 36V150°C maximum junction temperatureShutdown mode current of 2.3µANo-load sleep current of 9.5µAInternal soft-start ramp of 3msStackable up to two phasesInternal bootstrap diodeSwitching frequency from 100kHz to 2.2MHzSYNC in and SYNC out capabilityInherent 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 hysteresisCreate a custom design using the LM25148-Q1 withWEBENCH Power Designer

Description

The LM25148-Q1 is a 42V, 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 LM25148-Q1 can be set up in dual-phase mode (paralleled output) with accurate current sharing for high-current applications. The device can operate at input voltages as low as 3.5V, at nearly 100% duty cycle if needed. The LM25148-Q1 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. Additional features of the LM25148-Q1 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator, internal 3ms soft-start time, and thermal shutdown protection with automatic recovery. The LM25148-Q1 is a 42V, 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 LM25148-Q1 can be set up in dual-phase mode (paralleled output) with accurate current sharing for high-current applications. The device can operate at input voltages as low as 3.5V, at nearly 100% duty cycle if needed. The LM25148-Q1 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. Additional features of the LM25148-Q1 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator, internal 3ms soft-start time, and thermal shutdown protection with automatic recovery.