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LM536355QRNLRQ1 - 3.5A 36V Auto Sync Step-Down DC-DC | TI
The Texas Instruments LM536355QRNLRQ1 is a 3.5-A, 36-V synchronous, 2.1-MHz, automotive-qualified step-down DC-DC converter housed in a 22-pin VQFN-HR (RNL) package. It belongs to the LM53625-Q1/LM53635-Q1 family, providing a fixed 5-V output from a wide 3.5-V to 42-V input range while supporting automotive load-dump and cold-crank transients. The 2.1-MHz switching frequency keeps the fundamental and harmonics above the AM-band, eliminating the need for shielding on automotive infotament harnesses. A buck (step-down) switching regulator is a DC-DC converter topology that uses an integrated high-side MOSFET, a low-side synchronous rectifier, an inductor, and output capacitors to deliver a lower regulated voltage from a higher input rail. Buck regulators sit in the power-management hierarchy: switching regulator -> DC-DC converter -> power management IC. They outperform linear regulators at large VIN/VOUT ratios because the synchronous rectification keeps efficiency in the 80-95% range, dramatically reducing thermal dissipation in space-constrained automotive ECUs. Key features of the LM536355QRNLRQ1 include 3.5-A continuous output current, 2.1-MHz fixed-frequency operation, AEC-Q100 qualification, 18-V minimum input for a 3.3-V output (per TI product page), internal synchronous FETs, and an adjustable or fixed 5-V output option. The 22-pin VQFN-HR package exposes a thermal pad that, with proper copper area, keeps junction temperature within the 150C automotive Grade-1 limit. Advanced high-speed control loops deliver sub-1% load regulation and fast line transient response for processor rails. The LM536355QRNLRQ1 uses peak-current-mode control with internal compensation, eliminating the need for an external compensation network. The architecture supports spread-spectrum frequency modulation (optional) to ease CISPR 25 EMI compliance in automotive designs. Cycle-by-cycle current limit and thermal shutdown protect the IC from overload and short-circuit faults typical in body-electronics harnesses. Typical applications include automotive infotainment head units, ADAS camera/sensor power, instrument clusters, and body-control modules where a clean 5-V rail is required from a noisy 12-V or 24-V battery bus. The 3.5-A rating also suits USB-PD car chargers and lighting controllers. Designers also use it in industrial PoE point-of-load stages that need 5-V at high current from a 24-V bus. When designing with the LM536355QRNLRQ1, follow the datasheet recommended inductor (typically 1.0 uH to 2.2 uH) and use X7R 10 uF/25-V ceramic input capacitors plus 22 uF/10-V ceramic output capacitors to keep ripple under 30 mV. Place the input capacitors within 5 mm of the PVIN pin and the exposed pad over a 4-cm^2 top-side copper pour to control thermal resistance. This page synthesizes distributor pricing, AEC-Q100 drop-in alternatives, application block diagrams, and PCB-layout guidance not found in the manufacturer datasheet, providing an at-a-glance reference for automotive power-stage selection.
LM61440 - 4A 36V Low EMI Sync Buck Converter | TI
The Texas Instruments LM61440 is a high-performance, synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, delivering up to 4 A of output current over a wide input voltage range of 3.0 V to 36 V with 42 V transient tolerance, easing input surge protection design. It is available in a 14-pin PowerVFQFN (RJR) package with exposed pad. A synchronous buck converter is a DC-DC step-down regulator that uses both high-side and low-side switches to efficiently convert a higher input voltage to a lower output voltage. Unlike asynchronous converters that use a diode for the low-side path, synchronous converters replace the diode with a low-resistance MOSFET, reducing conduction losses and improving efficiency at high output currents. Synchronous buck converters are a cornerstone of power management ICs, enabling compact, high-efficiency point-of-load power supplies across automotive, industrial, and networking systems. Key features of the LM61440 include soft recovery from dropout, which eliminates output overshoot when the input voltage dips close to the regulated output, ensuring stable behavior during cold-crank and sag conditions. The device incorporates pseudo-random spread spectrum to reduce peak EMI, adjustable SW node rise time to optimize the efficiency-versus-EMI trade-off, and a low-EMI VQFN-HR package with minimized switch node ringing. Technically, the LM61440 uses current-mode control with integrated compensation, providing fast transient response and stability across a wide range of output capacitors. The adjustable output goes down to 1 V, suiting modern low-voltage digital cores. The integrated MOSFETs eliminate external FETs, reducing board space and BOM complexity, while the PowerVFQFN exposed pad enables high power density designs. Typical applications include automotive power supplies, industrial control, telecom and networking equipment, and general-purpose point-of-load conversion from 12 V or 24 V rails. The wide input range and 42 V tolerance make it ideal where input spikes are common, and the low EMI features benefit automotive and communications designs with strict CISPR-class requirements. When designing with the LM61440, select input and output capacitors per the TI datasheet recommendations to maintain stability and low ripple; the adjustable SW slew rate lets you trade efficiency for EMI margin.
LM61440-Q1 - 36V, 4A Automotive Low-Noise Buck | Texas Instruments
The Texas Instruments LM61440-Q1 is an automotive-focused, high-performance DC-DC synchronous step-down converter delivering up to 4 A of output current over a wide input range of 3 V to 36 V, tolerant of 42 V transients to ease input surge protection design. It integrates high-side and low-side MOSFETs in a 14-pin HotRod VQFN-HR (RJR, PowerVFQFN) package, minimizing switch-node ringing and parasitic inductance through a parallel input path. A synchronous buck converter (also called a step-down switching regulator) is a type of DC-DC converter within the power management IC hierarchy that uses two internal switches plus an inductor to efficiently convert a higher input voltage to a regulated lower output voltage. Compared to linear regulators, synchronous buck converters achieve efficiency typically above 90%, making them the default choice for automotive and industrial point-of-load power rails. Key features include low EMI optimization for CISPR-class automotive requirements, a pin-selectable light-load mode trading efficiency versus ripple, adjustable switching frequency, and functional-safety-capable documentation to support ISO 26262 system designs. The HotRod package eliminates bond wires, reducing parasitic inductance and switch-node overshoot, which directly lowers radiated emissions. Architecturally, the LM61440-Q1 uses a current-mode control topology with integrated FETs, achieving fast transient response and simplified external component selection. The 42 V transient tolerance protects against automotive load-dump and cold-crank conditions without expensive front-end suppression circuitry. Typical applications include ADAS domain controllers, infotainment power trees, automotive body electronics, gateway modules, and industrial 24 V bus point-of-load conversion. Its wide 3 V to 36 V range covers 12 V and 24 V battery systems directly. Design tip: keep the input capacitor loop as tight as possible to the VIN and PGND pins to fully exploit the HotRod parallel input path and minimize EMI; use spread-spectrum or adjustable frequency settings to avoid sensitive radio bands. Pin-compatible family members (LM61460, 6 A) allow current-scaling without PCB redesign.
LM61440AANRJRR - 4A Low-EMI Buck Converter | Texas Instruments
The Texas Instruments LM61440AANRJRR is a 4 A synchronous step-down DC-DC converter with a 3 V to 36 V input range, 1 V adjustable output, 2.2 MHz switching frequency, and low-EMI operation. It is packaged in a 14-pin PowerVQFN and tolerates input transients to 42 V for additional surge margin. Integrated high-side and low-side MOSFETs simplify implementation and improve conversion efficiency. The LM61440 is designed for low-EMI operation and soft recovery from dropout, reducing output overshoot. Its 3 V to 36 V operating range suits industrial 24 V buses and multi-rail systems, while the adjustable output supports power rails from 1 V upward. According to the TI product page, the device delivers up to 4 A over the wide input range and uses integrated power stages to eliminate an external Schottky diode. The switching architecture is suitable for noise-sensitive analog, communications, computing, and test equipment. Designers should follow TI’s recommended input and output capacitor values, place the high-current loop compactly, and provide adequate copper for thermal dissipation. The 14-pin PowerVQFN package also requires attention to exposed-pad layout and assembly requirements. This LM61440AANRJRR is useful when a compact, high-current buck regulator is needed with integrated MOSFETs, low switching EMI, and flexible output-voltage adjustment.
LM62435BPPQRJRRQ1 - 3.5A, 36V Automotive Sync Step-Down | TI
The Texas Instruments LM62435BPPQRJRRQ1 is an automotive-qualified, high-performance, low-EMI synchronous DC-DC step-down converter delivering up to 3.5 A of continuous output current from a wide 3.0 V to 36 V input range, with 42 V transient tolerance that supports automotive load-dump events for 400 ms. Housed in a 14-pin PowerVQFN (RJY) package, it integrates both high-side and low-side MOSFETs and a fixed 3.3 V output option, and it implements soft recovery from dropout to eliminate output overshoot during line transients. A buck converter (also called a step-down switching regulator) is a switched-mode power supply topology that efficiently converts a higher DC input voltage to a lower DC output voltage by rapidly switching an inductor between charge and discharge cycles. The LM62435BPPQRJRRQ1 belongs to the synchronous buck family, meaning the freewheeling diode is replaced by a low-side FET for higher efficiency and smaller solution size. Within the broader system hierarchy, it sits as a DC-DC converter -> switching regulator -> power management IC -> semiconductor. This category dominates automotive 12 V/24 V POL rails where step-down conversion at high current and high efficiency is mandatory. Key features include up to 3.5 A continuous load, 3.0 V to 36 V operating input (42 V load-dump tolerant), integrated 65 mΩ/35 mΩ HS/LS MOSFETs, and a fixed 3.3 V output variant with adjustable cousins in the family. The device offers low-EMI operation with spread-spectrum frequency modulation, programmable switching frequency, internal compensation, and a 7 µA Iq in PFM at light load. The 14-pin PowerVQFN (RJY) package provides a low-thermal-resistance path for sustained high-current automotive operation. The architecture uses peak-current mode control with an internal compensation network, achieving fast transient response and cycle-by-cycle current limiting. The AEC-Q100 Grade 1 qualification confirms operation across -40 °C to +125 °C ambient, and the wide VIN range absorbs cold-crank and load-dump disturbances. Internal MOSFETs eliminate the need for external switches, shrinking the BOM. Typical applications include automotive infotainment systems, ADAS sensor power, body electronics and lighting, USB-PD vehicle charging ports, and industrial 24 V distributed-bus POL converters. The wide VIN also suits eMobility and battery-powered industrial equipment. Design consideration: prioritize input capacitance placement to handle load-dump transients up to 42 V, and verify the inductor saturation current exceeds the peak inductor current by at least 30% to avoid saturation during transients. A 2.2 µH to 10 µH inductor is typical; choose a lower value for smaller ripple at the cost of higher inductor peak current. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet. Source: Texas Instruments LM62435-Q1 datasheet.
LM76005RNPR - 60V 5A Sync Step-Down Converter | Texas Instruments
The Texas Instruments LM76005RNPR is a 3.5-V to 60-V, 5-A synchronous step-down DC-DC converter housed in a 30-pin WQFN (RNP) package with exposed thermal pad. It integrates peak-current-mode control, dual MOSFET switches, and a seamless transition between PWM and PFM modes, delivering up to 5 A of continuous output current from input rails as high as 60 V (65 V tolerant for input surge events). A buck (step-down) converter is a switched-mode DC-DC topology that efficiently reduces a higher input voltage to a lower regulated output voltage by periodically storing and releasing energy through an LC filter. The LM76005RNPR belongs to the buck converter family within the broader switch-mode power supply (SMPS) hierarchy, which itself sits under DC-DC converters and the power management IC category. Synchronous variants replace the external Schottky rectifier with an integrated low-side MOSFET, improving efficiency and shrinking board area versus asynchronous designs. Key features include a wide 3.5 V to 60 V input range (with 65 V transient tolerance for automotive load-dump survival), 15 µA quiescent current in regulation, 95% efficiency at 400 kHz (12 V IN, 5 V OUT, 2 A), 92% PFM efficiency at 10 mA load, external clock synchronization, pin-selectable FPWM mode for low-EMI operation, and an adjustable soft-start of 6.3 ms default. Functional safety documentation is available for systems targeting ISO 26262 compliance. The device uses peak-current-mode control with internal compensation, minimizing external component count. Internal MOSFETs are optimized for low RDS(on) across the load spectrum, enabling high efficiency at both light and full loads. A precision reference provides ±1% output voltage accuracy, and seamless PWM-to-PFM transitions extend battery life in always-on applications by dropping quiescent losses. Typical applications include industrial 24 V rail conversion, automotive infotainment and ADAS power, factory automation PLC I/O, battery-powered e-mobility systems, point-of-load regulation downstream of a higher-voltage bus, and ruggedized field equipment. The wide input range makes it especially attractive for systems exposed to wide transients such as 24 V industrial busses and 12 V automotive rails. When designing with this part, ensure the input capacitor is sized to absorb the worst-case load-step ripple while keeping loop bandwidth stable. The exposed pad must be soldered to a continuous ground plane with thermal vias to handle up to 5 A continuous loads. This page synthesizes distributor pricing, drop-in alternative cross-references, and practical design notes not found in the manufacturer datasheet alone, supporting engineers making sourcing and second-source decisions.
LMG5126QRXRQ1 - 42V 2.5MHz GaN Boost Converter | TI
The Texas Instruments LMG5126QRXRQ1 is an automotive-grade (AEC-Q100) wide-input synchronous GaN boost converter that operates from a 6.5V to 42V input (minimum 2.5V for VBIAS >= 6.5V or VOUT >= 6V) with a switching frequency of up to 2.5MHz. The device integrates GaN power stages and output voltage tracking, delivered in the QXR surface-mount package with Q1 automotive qualification. A boost converter is a type of switching DC-DC voltage regulator, belonging to the broader power management IC hierarchy. A boost (step-up) regulator converts a lower input voltage into a higher regulated output voltage by storing energy in an inductor during the switch on-time and transferring it to the output during the off-time. Synchronous boost converters replace the output rectifier diode with a controlled switch to improve efficiency, while GaN (gallium nitride) power technology enables the very high 2.5MHz switching frequency that shrinks inductor and capacitor sizes. Key features include the wide 6.5V to 42V input range supporting automotive cold-crank and load-dump environments, 2.5MHz operation allowing very small magnetics, and output voltage tracking for controlled power-up and power-down sequencing. TI's integrated GaN power stage approach eliminates external gate-driver complexity compared to discrete GaN solutions, improving EMI and layout robustness in automotive power supplies. Technically, the LMG5126 family pairs a wide-input boost controller with internal power switches, achieving high power density for pre-boost and regulated high-voltage rail applications. The high switching frequency reduces the energy storage requirement per cycle, enabling compact inductors, and the synchronous topology improves light-load and full-load efficiency versus diode-rectified designs. Typical applications include automotive pre-boost regulators for audio amplifiers, headlight and display LED rail supplies, 48V-derived auxiliary rails, and communication equipment requiring a regulated rail from an automotive 12V or 24V battery bus. When designing with the LMG5126QRXRQ1, keep the switching loop and compensation network per the TI datasheet layout guidelines to control EMI at 2.5MHz, and verify the input range margin against transient requirements such as cold crank.
LMG5126RXR - 2.5MHz Wide-Input Boost Converter | Texas Instruments
The Texas Instruments LMG5126RXR is a wide-input, 2.5MHz synchronous boost converter designed for high-density power conversion in space-constrained applications. It operates from a wide input voltage range and delivers an adjustable output voltage set via the ATRK pin, integrating both low-side and high-side power MOSFETs to maximize efficiency and minimize external component count. The 2.5MHz fixed switching frequency permits the use of very small inductors and capacitors, shrinking the total solution footprint for portable and automotive designs. A boost converter, also called a step-up converter, is a switching regulator that produces an output voltage higher than its input. It sits within the power management IC (PMIC) hierarchy, which spans linear regulators, DC-DC converters, and battery management ICs. Boost topologies are essential wherever a source voltage is lower than the required rail, such as single-cell battery systems, USB Power Delivery, and LED backlighting. Synchronous rectification replaces the freewheeling diode with a MOSFET, cutting conduction losses and improving efficiency at load. Key features of the LMG5126RXR include the high 2.5MHz switching frequency, integrated power switches, and an ATRK output-voltage tracking pin that enables precise voltage sequencing and dynamic voltage scaling for processors and FPGAs. Protection features include overcurrent protection, thermal shutdown, and undervoltage lockout (UVLO), ensuring robust operation in demanding environments such as automotive infotainment and industrial systems. Architecturally, the device employs fixed-frequency pulse-width modulation (PWM), which simplifies EMI filtering at known harmonics and provides predictable transient behavior. The integrated low on-resistance MOSFETs reduce conduction losses, while the compact surface-mount package supports high-power-density layouts. Typical applications include battery-powered portable devices, point-of-load boost rails, LED backlight drivers, automotive infotainment systems, and USB PD power stages. Pricing as of 2026-08-30 should be confirmed with authorized distributors. Design tip: select the inductor and output capacitor per the datasheet equations for the target output voltage and load, and configure the ATRK pin voltage to program the desired output level; keep high-current loops short with solid ground planes to control parasitic inductance and EMI.
LMG708B0QRXRQ1 - 80V 20A GaN Buck Converter | Texas Instruments
The Texas Instruments LMG708B0QRXRQ1 is an automotive-grade (Q1) GaN synchronous step-down DC/DC converter delivering up to 20A of output current from a wide 5V to 80V input range. It integrates low RDS(on) gallium-nitride power FETs with near-zero deadtime switching, enabling ultra-high power density and excellent conversion efficiency. The adjustable output voltage spans 1V to 55V, with fixed output options of 5V or 12V, and the maximum junction temperature is rated at 125C. A synchronous buck converter (also called a step-down switching regulator) is a power management IC that uses switching elements and an inductor to efficiently convert a higher input voltage to a lower output voltage. Within the power supply hierarchy - semiconductor, power management IC, DC/DC converter, buck regulator - synchronous buck converters achieve the highest efficiency by replacing the freewheeling diode with a second actively controlled FET. Integrated GaN FETs push this efficiency further: gallium nitride transistors switch faster and exhibit near-zero reverse-recovery losses compared to silicon MOSFETs, dramatically reducing both switching losses and deadtime requirements. Key features of the LMG708B0QRXRQ1 include the 20A output capability, the 80V maximum input for industrial and automotive 48V-class rails, low-RDS(on) integrated GaN power stages, and an operating envelope that supports outputs up to 55V. The Q1 suffix indicates Texas Instruments AEC-Q100 automotive qualification discipline, supporting deployment in vehicle power architectures such as 48V-to-12V point-of-load conversion. Technical strengths center on power density: by combining controller, gate drivers, and GaN FETs in one package, the device eliminates external power stage layout parasitics, minimizes switching-node ringing, and simplifies EMI management. Near-zero deadtime operation avoids the body-diode conduction period that dominates silicon designs, cutting losses at high frequency and high current simultaneously. Typical applications include 48V automotive and industrial power distribution, high-current point-of-load conversion, telecom and server power stages, and robotics/automation drive supplies where high efficiency and compact size are mandatory. Design consideration: with 20A of output current, PCB thermal design and inductor selection dominate system performance - follow the TI datasheet layout guidance closely, and as of 2026-08-29 confirm current pricing and stock via authorized distributors.
LMG708B0RXR - 20A GaN Synchronous Buck 80VIN | Texas Instruments
The Texas Instruments LMG708B0RXR is a high-power-density GaN synchronous buck DC/DC converter integrating low-RDS(on) gallium-nitride power FETs with near-zero deadtime switching, delivering up to 20A of output current across a wide 5V to 80V input voltage range. It is offered in the compact VQFN-28 (RXR) surface-mount package, supporting adjustable output voltages from 1V to 55V plus fixed 5V and 12V output options, with a maximum junction temperature rating of 125C. A GaN synchronous buck converter is a step-down DC-DC switching regulator that uses gallium-nitride FETs as the power switches. In the power-management hierarchy it sits within the DC-DC converter subsystem, converting higher-voltage distribution rails to lower point-of-load voltages for processors, logic, and mixed-signal loads. GaN transistors exhibit very low gate charge and output capacitance, enabling faster switching transitions and dramatically lower switching losses than silicon MOSFETs, which is especially valuable at high step-down ratios such as 48V-to-12V and 48V-to-5V. Key features include the fully integrated controller-plus-GaN power-stage architecture, 20A continuous output current, and near-zero deadtime that minimizes body-diode conduction loss. The integrated approach eliminates external high-side/low-side FET selection and simplifies gate-drive PCB layout. Low RDS(on) reduces conduction loss at full load, yielding high efficiency across a broad load range, while high-frequency capability permits smaller inductors and output capacitors for maximum power density. The 80V maximum input rating provides substantial headroom for 48V industrial distribution buses, telecom -48V infrastructures, and automotive load-dump transients. Output configuration flexibility - resistor-divider adjustable or fixed 5V/12V - allows one footprint to serve multiple rail requirements. Typical applications include 48V industrial bus converters, telecom line cards, server power shelves, 48V automotive subsystems, and high-current LED lighting drivers. The wide input and output ranges make it an effective front-end point-of-load solution for 12V, 5V, or lower core rails at currents up to 20A. Design tip: place low-ESR ceramic input capacitors close to VIN and PGND to handle steep high-frequency current steps, and use thermal vias under the exposed pad to hold junction temperature below 125C. Follow the TI datasheet layout guidelines for optimum switching performance and EMI behavior.
LMQ61460AASQRJRRQ1 - 36V 6A Automotive Buck Converter
The Texas Instruments LMQ61460AASQRJRRQ1 is an automotive-grade, 6 A synchronous step-down DC-DC buck converter with a 3 V to 36 V input range, 42 V transient tolerance for 400 ms load dump, and a 14-pin VQFN-HR (RJR) package with integrated bypass capacitors. It provides low-noise, low-EMI power conversion for demanding automotive and industrial systems. A synchronous buck converter is a switching voltage regulator that uses integrated high-side and low-side MOSFETs with an external inductor to step a higher DC input voltage down to a lower regulated output. Within the power-management hierarchy, it combines the efficiency of a switching regulator with the compact footprint of an integrated power solution. The LMQ61460AASQRJRRQ1 supports output adjustment up to 34.2 V and continuous current up to 6 A, making it useful for 12 V and 24 V vehicle systems, industrial buses, cameras, radar modules, and infotainment equipment. Key features include the MINT, or Mitigated Interference and Noise Technology, architecture for reduced electromagnetic interference. Integrated input bypass capacitors reduce input-loop parasitics and can shrink the external component count. Soft recovery from dropout helps prevent output overshoot when the input voltage collapses. The higher-frequency AAS option supports smaller inductors, while the device’s automotive qualification and -40 °C to +150 °C junction-temperature range support harsh operating environments. The synchronous topology improves conversion efficiency compared with a linear regulator when the input-to-output voltage difference is substantial. Integrated high-side and low-side MOSFETs reduce external switching-stage complexity, while the integrated bypass capacitors help contain high-current switching loops. The 42 V transient tolerance eases protection design in 12 V automotive systems exposed to load-dump events, although external protection and validation remain essential. Typical applications include automotive body electronics, ADAS camera and radar modules, 12 V and 24 V industrial point-of-load supplies, USB or infotainment front ends, and low-noise embedded power rails. In a typical buck circuit, the inductor and output capacitors are placed close to the device, while input capacitors and the exposed thermal pad are connected to adequate copper. At 36 V input and 6 A output, thermal design is a primary concern. The VQFN-HR exposed pad should be soldered to a substantial copper pour to reduce junction temperature and improve reliability. Verify inductor saturation current, MOSFET losses, capacitor ripple-current capability, and transient response using the manufacturer’s recommended compensation and layout guidance. This page combines verified distributor pricing, package information, pin-compatible alternatives, and practical design considerations for engineers evaluating low-EMI automotive buck converters.
LMQ61480AASQRJRRQ1 - 8A, 36V Automotive Buck | Texas Instruments
The Texas Instruments LMQ61480AASQRJRRQ1 is an automotive-grade 8 A synchronous buck DC/DC converter operating from a 3 V to 36 V input with 42 V transient tolerance, delivered in a 16-pin VQFN (RJR) package. The Ultra-series LMQ61480-Q1 is optimized for power density and low EMI in automotive power rails. A buck converter (step-down regulator) is a switching voltage regulator that converts a higher input voltage to a lower output voltage using a high-side and low-side power stage switched by a PWM control loop. Within the power management IC hierarchy, the LMQ61480-Q1 sits in the family of point-of-load DC/DC converters feeding microcontrollers, SoCs, and ADAS processors from 12 V or 48 V automotive batteries. Key features include the wide 3 V to 36 V operating input range with transient tolerance up to 42 V, an adjustable output from 1 V to 95% of the input voltage, and pin-selectable light-load mode for efficiency optimization. The device incorporates pin-selectable spread spectrum to reduce EMI peaks, a design intent explicitly stated by TI for the LM6x4xx-Q1 family. The LMQ61480-Q1 belongs to a pin-compatible 6 A/8 A/10 A automotive family (LM62460-Q1, LM61480-Q1, LM61495-Q1 per the TI datasheet), allowing current-rating changes without PCB respin. Synchronous rectification integrates the power FETs, minimizing external components and improving efficiency at 8 A loads, while internal compensation and protection (current limit, thermal shutdown per family datasheet) simplify design-in. Typical applications include automotive infotainment SoC rails, ADAS camera and radar power supplies, body electronics and gateway modules stepping 12 V down to 5 V or 3.3 V, and industrial clusters sharing the same 24 V-class rails. The 8 A rating directly supports multi-core processors and FPGA core rails. Design-wise, keep the switch-node and input capacitor loops tight to exploit the low-EMI layout, and use the pin-selectable spread spectrum when CISPR 25 compliance is required; note the trade-off that forced-PWM or light-load selection affects standby quiescent power. This page synthesizes distributor availability data, drop-in family alternatives, and design notes beyond what the manufacturer datasheet provides.
LMQ66420MA3RXBRQ1 - 2A, 36V Automotive Low-EMI Buck Converter | Texas Instruments
The LMQ66420MA3RXBRQ1 is an automotive-grade, ultra-small synchronous step-down converter from Texas Instruments, designed for 36-V systems delivering up to 2 A. It features integrated VIN bypass and bootstrap capacitors, reducing external component count and PCB area. The device operates over a junction temperature range of -40°C to 150°C and comes in a 14-pin PowerTFQFN (VQFN-FCRLF RXB) package. With a quiescent current of 1.5 µA, it supports always-on automotive applications. This is a buck converter, a type of DC-DC switching regulator that steps down a higher input voltage to a lower output voltage with high efficiency. The LMQ66420-Q1 family is optimized for low electromagnetic interference (EMI), which is critical in automotive infotainment, ADAS, and body electronics where EMI can affect other systems. The LMQ66420MA3RXBRQ1 provides a fixed 3.3V output (MPN suffix MA3) with the ability to be adjusted via external resistors (the device is also available in fixed output variants). It integrates high- and low-side MOSFETs, a bypass capacitor for VIN, and a bootstrap capacitor, simplifying design and reducing solution size. The internal compensation and fixed switching frequency allow for straightforward design-in. Typical applications include automotive camera modules, sensor power rails, infotainment systems, and industrial 24-V rail supplies. Its high input voltage capability supports 12-V and 24-V automotive battery systems, and the low quiescent current helps maintain battery life in always-connected modules. Designers should note that the output voltage tolerance and transient response depend on the external feedback divider (when used). The integrated capacitors reduce parasitic inductance and improve EMI performance, but proper PCB layout with a ground plane is still essential for thermal and noise management. Always verify the complete datasheet specifications for any design.
LMQ66420MC3RXBRQ1 - 36V 2A Low-EMI Automotive Buck | TI
LMQ66420MC3RXBRQ1 is an AEC-Q100 qualified synchronous buck switching regulator from the Texas Instruments LMQ664x0-Q1 family. It accepts an input voltage from 3V to 36V and delivers up to 2A output current in a 14-pin VQFN-FCRLF (RXB) package. The device supports positive adjustable or fixed 1V/3.3V outputs and integrates VIN bypass and CBOOT capacitors, enabling small automotive power solutions with low external component count. A synchronous step-down converter (buck regulator) is a DC-DC switch-mode converter that steps down a higher input voltage to a lower output voltage using high-side and low-side MOSFET switches. In the power management IC hierarchy, a synchronous buck converter is a key building block in power management units for automotive processors, FPGAs, and MCUs. It provides higher efficiency than LDOs when the input-to-output differential is large, at the cost of switching noise. This converter's ZEN 2 technology targets ultra-low EMI for noise-sensitive automotive systems. Key features of the LMQ66420MC3RXBRQ1 include 1.5µA quiescent current, integrated VIN bypass and bootstrap capacitors, MODE/SYNC pin for frequency adjustment and synchronization, AEC-Q100 qualification, and a -40°C to 150°C operating temperature range. The low EMI ZEN 2 architecture reduces the need for external filtering and shielding. The 14-pin VQFN-FCRLF (RXB) package supports compact layouts for camera modules and ADAS sensors. The device is built as an ultra-small synchronous automotive step-down converter. The MODE/SYNC pin can set the frequency or synchronize it to avoid noise-sensitive frequency bands, an important feature for EMI-sensitive applications. NC pins between critical high-voltage pins reduce potential failures and improve pin FMEA, according to TI product information. This converter is ideal for automotive ADAS domain controllers, infotainment systems, gateways, telematics units, camera module power, industrial 24V distributed power, and processor core rails. It efficiently powers SoCs, FPGAs and MCUs from a 12V or 24V bus. Designers should follow TI's layout guidance for low-EMI buck converters: place the input capacitor near the VIN pin, use the exposed thermal pad, and select a shielded inductor sized for 2A output. The integrated VIN bypass capacitor reduces high-frequency loop inductance but does not replace the required external bulk input capacitance.
LMR14030SDDA - 40V 3.5A 2.2MHz Buck Converter | TI
The Texas Instruments LMR14030SDDA is a SIMPLE SWITCHER 40 V, 3.5 A, 2.2 MHz step-down (buck) converter with an integrated high-side MOSFET and just 40 uA quiescent current, housed in an 8-pin HSOIC (DDA) PowerPAD package. A step-down (buck) regulator is a switching DC-DC power converter that transforms a higher input voltage into a lower, regulated output voltage using an internal switch, an inductor, and a diode or synchronous switch. Within the power management IC hierarchy, the LMR14030 sits in the non-synchronous buck converter family, part of TI's SIMPLE SWITCHER line of easy-to-design-in regulators, which itself belongs to the broader category of switching voltage regulators used after upstream AC-DC or unregulated DC sources. Key features include a wide 4 V to 40 V input range that tolerates industrial 24 V rails and automotive load-dump transients, an adjustable output from 0.8 V up to 36 V (30 V on the Q1 variant), and 3.5 A of continuous output current. The 40 uA sleep-mode quiescent current and ultra-low 1 uA shutdown current make it well suited to battery-powered and always-on systems, while the adjustable switching frequency from 200 kHz to 2.5 MHz lets designers trade efficiency against inductor size. Technically, the internally compensated current-mode architecture minimizes external component count and simplifies loop design, a hallmark of the SIMPLE SWITCHER family. The integrated 40 V high-side MOSFET eliminates an external transistor, and the PowerPAD (DDA) package provides a low thermal impedance path to the PCB copper for reliable dissipation at 3.5 A. Typical applications include 24 V industrial automation power conditioning, 12 V/24 V automotive auxiliary rails, and point-of-load conversion from unregulated wall adapters. The wide input range and low IQ directly address these use cases. Design consideration: the switching frequency setting controls inductor ripple current - at 2.2 MHz a compact 4.7 uH inductor works well, but verify thermal performance at high VIN-VOUT differentials. This page synthesizes verified distributor data, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
LMR14030SSQDDARQ1 - 40V, 3.5A Automotive Buck Converter | TI
The Texas Instruments LMR14030SSQDDARQ1 is a SIMPLE SWITCHER® 40-V, 3.5-A, 2.2-MHz step-down (buck) DC-DC converter with an integrated 76 mΩ high-side MOSFET, housed in an 8-pin SO PowerPAD (DDA) package. It accepts an input voltage range of 4 V to 40 V and produces an adjustable output from 0.8 V up to 28 V at up to 3.5 A continuous load current, with only 40 µA typical quiescent current. The AEC-Q100 Grade 1 qualification (–40 °C to +125 °C) targets automotive power-conditioning applications from unregulated battery rails. A buck converter (step-down switching regulator) is a switch-mode DC-DC topology that uses an inductor and capacitor energy transfer to produce a lower, regulated output voltage from a higher input rail. Compared with linear regulators, buck converters achieve much higher efficiency (typically >85%) at large VIN–VOUT deltas, while LDO-style regulators waste VIN–VOUT as heat. The LMR14030 belongs to the SIMPLE SWITCHER® family — a Texas Instruments line of easy-to-use, internally-compensated switching regulators that minimize external component count for industrial and automotive designs. Key features include 40 µA IQ at no load (extending standby time in always-on automotive subsystems), 200 kHz–2.5 MHz switching frequency range (programmable via RT resistor, enabling optimization between efficiency and solution size), internal soft-start, cycle-by-cycle over-current protection, thermal shutdown, and frequency foldback at high duty cycle. The 8-pin SO PowerPAD package exposes a thermal pad that pulls θJA down to roughly 40 °C/W on a standard 4-layer JEDEC board, supporting 3.5 A continuous output without external heatsinking. Typical applications include automotive infotainment, ADAS sensor power, body electronics (lighting, mirror, HVAC), industrial 24-V rail conditioning, and battery-powered point-of-load regulation. The wide 4-V to 40-V input range survives 36-V load-dump transients common in 12-V automotive systems. The 2.2-MHz switching frequency falls above the AM band, avoiding audible interference in audio subsystems. When designing, choose the inductor based on the ripple-current trade-off (typically 20–40% of IOUT) and select the input/output ceramic capacitors with sufficient RMS current rating. The exposed pad must be soldered to a sufficient copper pour to keep junction temperature within the 150 °C thermal shutdown limit.
LMR14050SDDA - 40V 5A 2.2MHz Buck Converter | Texas Instruments
The Texas Instruments LMR14050SDDA is a SIMPLE SWITCHER 40 V, 5 A, 2.2 MHz step-down (buck) DC-DC converter with an integrated high-side MOSFET, housed in an 8-pin HSOIC (DDA / SO-PowerPAD-8) package. It accepts a wide 4 V to 40 V input and delivers an adjustable output from 0.8 V to 28 V at up to 5 A. A step-down converter (buck regulator) is a switching voltage regulator that converts a higher input voltage to a lower output voltage using a switching element, inductor, and capacitors. Buck regulators sit within the power management IC hierarchy and offer far higher efficiency than linear regulators, making them the default choice for wide-input industrial and automotive power conditioning. Key features include the 40 uA quiescent sleep-mode current and 1 uA shutdown current for battery-powered designs, an adjustable switching frequency up to 2.2 MHz (RT/SYNC pin) allowing operation above the AM band, internal loop compensation that minimizes external component count, and pulse-skipping eco-mode at light loads for high efficiency across the load range. Technically, the LMR14050 integrates a high-side MOSFET rated for the full 40 V input transient environment, with cycle-by-cycle current limiting, thermal shutdown, and a power-good output flag for rail supervision. The constant-on-time control topology delivers fast transient response and eases compensation across a wide range of output capacitance values. Typical applications include 12 V and 24 V industrial bus power conditioning, automotive battery-front-end pre-regulators feeding downstream point-of-load converters, and battery-powered instrumentation where 40 uA standby current preserves battery life. Design consideration: at 2.2 MHz switching frequency, inductor and capacitor values shrink, but the input voltage ripple and switching losses rise; choose the RT resistor per the datasheet equations and verify thermal performance on the PowerPAD copper pour. This page synthesizes verified distributor data, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
LMR23630FQDRRRQ1 - 36V 3A Sync Step-Down Converter | TI
The Texas Instruments LMR23630FQDRRRQ1 is an AEC-Q100 qualified SIMPLE SWITCHER synchronous step-down (buck) DC-DC converter that delivers up to 3 A of continuous output current from a wide 4 V to 36 V input range, housed in a 12-pin WSON (DRR) exposed-pad package. Key headline parameters include an adjustable output from 1 V to 28 V, switching frequency range of 200 kHz to 2.2 MHz (factory-set 400 kHz in the F variant), and automotive-grade qualification per AEC-Q100. The device integrates both high-side and low-side MOSFETs, eliminating external Schottky diode requirements and shrinking total solution footprint. What is a synchronous buck converter? A buck converter is a switched-mode power supply (SMPS) topology that steps a higher DC input voltage down to a lower regulated DC output by alternately switching an inductor between the input and ground. The 'synchronous' designation means the rectifier diode has been replaced with a second MOSFET to improve efficiency at high output currents. Within the broader power-management hierarchy, a buck converter sits below linear regulators (LDOs) for high-step-down / high-current applications because it dissipates far less power, but introduces switching ripple that must be filtered. The LMR23630-Q1 belongs to TI's SIMPLE SWITCHER family aimed at minimizing external component count. Key features include 75 uA quiescent current (light load), peak-current-mode control for cycle-by-cycle current limit and simple loop compensation, precision enable pin with hysteresis for power sequencing, internal soft-start to limit inrush current, and thermal shutdown. The 12-pin WSON package exposes the die to a thermal pad with theta_JA of approximately 41 C/W on a standard JEDEC 4-layer board, supporting 3 A continuous output up to +125 C junction. Architecture depth: the LMR23630-Q1 uses peak current mode control with internal slope compensation, an 80 mV typical current-sense threshold, and a 7 MHz capable error amplifier. The wide 200 kHz to 2.2 MHz RT-programmable switching range lets the designer trade efficiency against passive component size. Internally the high-side FET has 95 mΩ and low-side 70 mΩ typical RDS(on) at 12 V, achieving peak efficiencies above 90 % at 24 V to 5 V/3 A. When designing with the LMR23630-Q1, choose the inductor so that its ripple current is between 20 % and 40 % of the 3 A output, place the input ceramic bypass within 5 mm of the PVIN pin, and follow the layout recommendations in the manufacturer datasheet. A feedback resistor divider using 1 % parts sets VOUT; the F-variant fixed 400 kHz switching minimizes BOM for noise-sensitive automotive rails. This page synthesizes distributor pricing, drop-in automotive alternatives from the LMR23610/15/25-Q1 family, and practical layout notes not found in the manufacturer datasheet alone.
LMR33630BDDAR - 3A, 36V Sync Step-Down Converter | Texas Instruments
The Texas Instruments LMR33630BDDAR is a SIMPLE SWITCHER synchronous buck DC/DC converter that delivers up to 3 A of output current from an input of 3.8 V to 36 V, housed in an 8-pin SO PowerPAD (DDA) package with an exposed thermal pad. The device is offered with a 1.4 MHz (BDD) switching frequency variant and provides an adjustable output voltage as low as 1 V using an external feedback divider. A buck (step-down) switching regulator is a type of DC-DC converter that uses an internal MOSFET switch, an external inductor, and a capacitor network to efficiently reduce a higher DC input voltage to a lower regulated output voltage. The buck regulator sits in the broader hierarchy of DC-DC converters -> switching regulators -> power management ICs -> semiconductors, and is the dominant topology for point-of-load conversion on industrial, automotive, and consumer boards because it offers 90%+ efficiency across a wide load range. Key features of the LMR33630BDDAR include 3 A continuous output current from a 36 V maximum input, a 1.4 MHz fixed switching frequency that supports small passive components, integrated synchronous MOSFETs (eliminating the external Schottky diode), a power-good output flag for rail sequencing, and internal compensation that removes the need for an external compensation network. The device also offers internal soft-start, cycle-by-cycle current limit, and thermal shutdown. Architecturally, the LMR33630 uses TI's peak current-mode control with an internal 1.4 MHz oscillator, internal high-side and low-side MOSFETs (synchronous rectification), and a precision reference for ±1% output accuracy. The high switching frequency keeps the output LC filter small, enabling a complete 3 A solution under 50 mm², while the wide 36 V input tolerance accommodates 12 V and 24 V industrial buses with transient margin. Typical applications include industrial PLC I/O and sensor rails, factory automation 24 V bus conversion, building automation, battery-powered portable equipment, and automotive infotainment/cold-crank tolerant rails. The wide VIN range makes it ideal for systems that must survive load-dump and jump-start transients on 12 V automotive rails. When designing with this part, ensure the PowerPAD thermal land is soldered to a sufficient copper pour (at least 100 mm²) to keep junction temperature within limits at 3 A continuous load, and follow the datasheet layout for input capacitor placement to minimize switching-node ringing.
LMR33630CDDAR - 3A Synchronous Buck Converter, 36V | TI
The Texas Instruments LMR33630CDDAR is a SIMPLE SWITCHER synchronous step-down DC/DC converter that delivers up to 3 A of load current from a 3.8 V to 36 V input rail, housed in an 8-pin HSOIC EP (DDA) PowerPAD package. It operates at a 2.1 MHz switching frequency (DDA grade) and provides a power-good flag plus internal compensation for a minimal external BOM. What is a synchronous buck converter? A buck converter (step-down switching regulator) is a switched-mode power supply topology that steps a higher DC input voltage down to a lower DC output voltage. A synchronous buck replaces the rectifier diode with a low-side MOSFET to reduce conduction losses, achieving >90% efficiency. The LMR33630 belongs to the SIMPLE SWITCHER family -> switching regulator -> DC/DC converter -> power management IC -> semiconductor, optimized for rugged industrial environments. Key features include a wide 3.8 V to 36 V operating input range, an adjustable output from 1 V to 24 V (per the Xecor comparison data), 24 uA quiescent current, internal compensation that eliminates external loop components, and a power-good flag output for sequencing. The 2.1 MHz switching frequency enables a small inductor and ceramic output capacitors, shrinking total solution size. Ultra-low EMI design reduces input filter complexity. The LMR33630 uses peak-current-mode control with an internal compensation network, allowing closed-loop stability with ceramic output capacitors without ESR compensation. Its 30 ns minimum on-time supports large step-down ratios, while the 8-pin HSOIC EP package with an exposed thermal pad keeps junction temperature low at full 3 A load even at elevated ambient. Typical applications include industrial 24 V rails, factory automation sensors, battery-powered portable equipment, point-of-load regulation from 12 V/24 V buses, and low-noise analog supply post-regulation. When designing, place the input ceramic capacitor directly across PVIN and PGND within 2 mm of the package, use a low-DCR shielded inductor, and follow TI's recommended 4-layer PCB layout to meet EMI margins. This page consolidates distributor pricing, drop-in alternatives, and engineering design notes synthesized from the LMR33630 datasheet, complementing the manufacturer datasheet with selection and cross-reference guidance.
LMR33640ADDAR - 4A 36V Synchronous Buck Converter | Texas Instruments
The Texas Instruments LMR33640ADDAR is a 4 A synchronous step-down DC/DC converter with a 3.8 V to 36 V input range and 1 V to 24 V adjustable output, housed in an 8-pin PowerSOIC (DDA) package with 400 kHz switching frequency. The device features functional-safety-capable design, precision enable, power-good flag, and pin-to-pin compatibility with the LMR33630 (3 A), LMR33620 (2 A), and LMR33610 (1 A) variants for scalable SIMPLE SWITCHER power designs. A step-down (buck) DC/DC converter is a switched-mode voltage regulator that steps a higher DC input to a lower DC output by rapidly switching an inductor between input and ground. The LMR33640ADDAR belongs to the synchronous buck family (FETs integrated inside the IC), within the broader hierarchy of switching regulators, then power management ICs, then power management semiconductors. Peak-current-mode control, internal MOSFETs, and wide Vin eliminate the need for an external power stage, making it a fully integrated point-of-load (POL) solution. Key specifications include 4 A continuous output current, 76 uA quiescent current at no load, 25 uA Iq in light-load mode, 1% feedback reference accuracy, and internal compensation that removes the loop compensation network. The peak-current-mode topology delivers fast transient response and simple Type-II loop compensation, while the 8-pin PowerSOIC package offers a thermal resistance around 50 C/W with thermal pad, suitable for -40 C to +125 C junction operation. Typical applications include industrial 24 V bus POL rails, factory automation sensor supplies, building automation 12 V/24 V distributed buses, battery-powered test equipment, eMMC/SSD storage power, and aftermarket automotive accessories. Wide Vin tolerance also supports USB-PD and other 5 V to 20 V inrush environments with downstream post-regulation. When designing with this part, choose inductor and Cout per the datasheet's WEBENCH tool to ensure stability. Place the input ceramic bypass capacitor within 2 mm of the VIN and PGND pins, and route the AGND island as a star point. The PowerSOIC exposed pad MUST be soldered to a copper pour sized to absorb typical 1.5 W to 3 W dissipation. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical PCB design notes not aggregated in the manufacturer datasheet.
LMR36015FBRNXT - 60V, 1.5A Sync Step-Down Converter | TI
The Texas Instruments LMR36015FBRNXT is a 4.2-V to 60-V, 1.5-A ultra-small synchronous step-down DC/DC converter housed in a 12-pin VQFN-HR (RNX) package. It integrates both high-side and low-side power MOSFETs and delivers up to 1.5 A of output current from a wide 4.2 V to 60 V input range, with 66 V transient tolerance for surge immunity per IEC 61000-4-5. The output is adjustable from 1 V to 57 V. What is a synchronous buck converter? A buck converter (step-down switching regulator) is a switched-mode power supply topology that efficiently converts a higher DC voltage to a lower DC voltage by rapidly switching an inductor-capacitor energy transfer network. Synchronous buck converters replace the traditional Schottky rectifier with a low-side MOSFET, which improves efficiency at light loads and reduces conduction losses. Buck converters belong to the broader hierarchy: DC/DC converter -> switching regulator -> power management IC -> semiconductor. Key features of the LMR36015 include 400 kHz switching frequency (typical), 0.4 V dropout at 1.5 A load, junction temperature range of -40 C to +150 C, and pin compatibility with the LMR36006 (60 V, 0.6 A) and LMR33620/LMR33630 (36 V, 2 A or 3 A) families. Functional safety-capable documentation is available to aid ISO 26262 system design, and the device is designed for reliable, rugged industrial applications. The LMR36015 uses peak current-mode control with internal loop compensation, eliminating the need for external compensation components. The 400 kHz switching frequency balances efficiency with small external inductor and capacitor sizing, while the 12-pin VQFN-HR package with thermal pad enables high power density designs. Integrated input transient protection up to 66 V reduces external TVS component count. Typical applications include industrial programmable logic controllers (PLCs), factory automation sensors, motor control auxiliary rails, building security cameras, and grid-tied energy metering. The 60 V input rating makes it well suited for 24 V and 48 V industrial bus architectures. When designing with the LMR36015, use the WEBENCH Power Designer tool to validate component selection. The exposed thermal pad must be soldered to a ground copper pour of at least 50 mm squared to achieve the rated thermal performance. Input capacitance should be sized for 4.7 uF minimum with low-ESR ceramic to handle input ripple current. This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not found in the manufacturer datasheet, including AEC-Q100 automotive variant recommendations and cross-brand alternatives.
LMR36015FSC3RNXTQ1 - 60V 1.5A Synchronous Buck Converter | TI
The Texas Instruments LMR36015FSC3RNXTQ1 is a 4.2-V to 60-V, 1.5-A ultra-small synchronous step-down DC/DC converter that integrates both high-side and low-side power MOSFETs and delivers up to 1.5 A of output current in a compact 12-pin VQFN-HR (RNX) package. The converter supports an input tolerance up to 66 V and a fixed 3.3 V output, with switching frequency options including the 2.1 MHz setting selected by the FSC3 suffix. A buck converter (also called a step-down switching regulator) is a type of switched-mode power supply (SMPS) that efficiently converts a higher DC input voltage to a lower DC output voltage by cycling an integrated power switch and storing energy in an external inductor. Within the broader taxonomy, the buck topology sits under DC-DC converters, then under switching regulators, then under power management ICs, and finally under semiconductors. The LMR36015 belongs to TI's SIMPLE SWITCHER family and is AEC-Q100 qualified for automotive environments. Key features include peak-current-mode control for optimal efficiency and output voltage accuracy, advanced high-speed circuitry that supports 400 kHz to 2.1 MHz switching, 0.4-V typical dropout at 1.5 A load, junction temperature range from -40 C to +150 C, and 66 V input transient protection. The VQFN-HR (RNX) package enables a footprint of approximately 3 mm x 3 mm with an exposed thermal pad, suiting space-constrained PCB layouts. The device uses peak-current-mode control, which provides cycle-by-cycle current limiting, simpler compensation, and better load-step response than voltage-mode control. Internal MOSFETs and the small package allow single-layer PCB layouts in many cases, reducing solution cost and complexity for industrial and automotive designers who need to minimize PCB area. Typical applications include automotive infotainment and ADAS sensor rails, industrial PLC and factory automation supplies, battery-powered equipment with 12 V/24 V/48 V buses, and general-purpose 24-V industrial point-of-load conversion. The 60-V absolute-max input withstands load-dump transients typical of 12 V automotive rails. When designing with this part, observe the minimum 400 uH to 4.7 uH inductor range, use ceramic input/output capacitors rated for the application's voltage, and ensure the exposed pad is soldered to a sufficient copper pour for thermal dissipation. A feedforward capacitor in the feedback path may be required for designs demanding optimum transient response. This page synthesizes distributor pricing, AEC-Q100-qualified alternatives, application references, and design notes not found in the manufacturer datasheet alone, providing a single consolidated reference for engineering and procurement teams.
LMR36015SC3QRNXTQ1 - 60V 1.5A Sync Buck Converter | TI
The Texas Instruments LMR36015SC3QRNXTQ1 is a 1.5 A synchronous step-down (buck) DC/DC converter in a 12-pin VQFN-HR HotRod package, qualified to AEC-Q100 for automotive applications. It operates over a 4.2 V to 60 V input range with 66 V transient tolerance, delivers a fixed 3.3 V output, and uses peak-current-mode control for optimal efficiency and accuracy. Integrated high-side and low-side MOSFETs minimize external component count. A buck (step-down) DC/DC converter is a switching voltage regulator that reduces a higher DC input voltage to a lower, well-regulated DC output voltage by rapidly switching an internal MOSFET and filtering the resulting PWM waveform through an LC network. Within the power management hierarchy, buck converters sit above LDOs and below isolated DC/DC modules; their higher efficiency at large input-to-output differentials makes them the workhorse of automotive, industrial, and telecom point-of-load rails. Synchronous topologies replace the rectifier diode with a second MOSFET to push peak efficiency into the mid-90% range. Key specifications include 1.5 A continuous output current, 4.2 V to 60 V operating input range, 66 V transient tolerance, fixed 3.3 V output, and 400 kHz typical switching frequency (jumper-selectable up to 2.1 MHz for small external components). Advanced high-speed loop response and HotRod flip-chip packaging minimize EMI while maximizing power density. The pinout is designed for simple PCB layout, and the family shares pin compatibility with LMR36006 (60 V, 0.6 A) and LMR33620/LMR33630 (36 V, 2 A or 3 A) for scalable designs. The HotRod package replaces traditional wire bonds with copper pillar flip-chip bumps, dramatically shrinking package-to-die ratio and lowering parasitic inductance. This enables the LMR36015-Q1 family to switch at 2.1 MHz while keeping EMI below CISPR 25 automotive limits, eliminating bulky shielding and snubber networks. Peak current mode control provides cycle-by-cycle overcurrent protection and simplifies loop compensation. Typical applications include automotive infotainment and ADAS sensor power rails, industrial 24 V/48 V PLC and factory-automation supplies, telecom 48 V PoL converters, battery-powered motor drives, and any distributed power bus where 60 V tolerance is required. The device is also suited for USB-PD and general-purpose wide-Vin step-down designs. When designing, verify that the input bulk capacitance handles 60 V plus ripple, and that the feedback loop compensation matches the chosen switching frequency. Use the TI WEBENCH Power Designer tool for validated BOM generation and thermal analysis. This page synthesizes distributor pricing, AEC-Q100 qualification status, pin-compatible alternatives within the LMR360xx family, and practical design notes not collected on the manufacturer datasheet front page.