LM5148 Series

3.5-V to 80-V, current mode synchronous buck controller

Catalog

3.5-V to 80-V, current mode synchronous buck controller

Part	Duty Cycle (Max) [Max]	Output Type	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Phases	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Number of Outputs	Output Configuration	Mounting Type	Package / Case	Supplier Device Package	Topology	Operating Temperature [Min]	Operating Temperature [Max]	Synchronous Rectifier	Function	Control Features	Clock Sync
Texas Instruments LM5148RGYR	100 %	Transistor Driver	100 kHz	2.2 MHz	1	3.5 V	80 V	1	Positive	Surface Mount	24-VFQFN Exposed Pad	24-VQFN (3.5x5.5)	Buck	-40 °C	125 ¯C		Step-Down	Current Limit Dead Time Control Enable Frequency Control Phase Control Power Good Ramp Soft Start

Catalog

3.5-V to 80-V, current mode synchronous buck controller

Key Features

• Functional 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 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 hysteresisCreate a custom design using the LM5148 withWEBENCH Power DesignerFunctional 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 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 hysteresisCreate a custom design using the LM5148 withWEBENCH Power Designer

Description

The LM5148 is a 80-V, ultra-low IQsynchronous 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. Additional features of the LM5148 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 3-ms soft-start time, and thermal shutdown protection with automatic recovery. The LM5148 controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package. The LM5148 is a 80-V, ultra-low IQsynchronous 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. Additional features of the LM5148 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 3-ms soft-start time, and thermal shutdown protection with automatic recovery. The LM5148 controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package.