LM5148RGYR.pdf
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The LM5148RGYR is a versatile synchronous buck controller featuring programmable soft-start, advanced protection features, precision regulation and low EMI switching. The following summarizes the essential engineering points when evaluating this controller.
LM5148 supports 3.5 V to 65 V input, making it suitable for automotive battery systems, industrial buses, 48 V telecom lines and high-voltage DC rails. It uses synchronous rectification to maintain efficiency across a wide load range.
High-accuracy reference and error amplifier ensure tight output regulation. Programmable switching frequency (100 kHz–1 MHz) enables trade-offs between efficiency and solution size. External compensation allows fine control of transient response.
Integrated features include cycle-by-cycle current limit, UVLO, hiccup-mode OCP, thermal shutdown and short-circuit protection. These protections greatly enhance system robustness in harsh industrial and automotive conditions.
The adjustable switching frequency, optional spread-spectrum mode and optimized gate drive help designers meet CISPR-25 and automotive EMI compliance. LM5148 is ideal for noise-sensitive designs.
Synchronous operation, low-loss gate drivers and optimized dead-time management yield excellent efficiency under both light and full-load conditions. External MOSFET selection allows scalability for higher current or thermal constraints.
Provided in a compact VQFN-24 (RGY) package with thermal pad. Careful layout of the power loop, gate drive traces and exposed pad improves EMI, efficiency and thermal operation.
| Input Voltage Range | 3.5 V – 65 V |
|---|---|
| Topology | Non-isolated synchronous buck controller |
| Switching Frequency | 100 kHz – 1 MHz, programmable |
| Output Voltage | Adjustable (refer to feedback divider) |
| Protection Features | OCP, UVLO, OV, thermal shutdown, short-circuit protection, hiccup restart |
| Gate Drive | High-side & low-side MOSFET drivers |
| Package | VQFN-24 (RGY), exposed pad |
| Operating Temperature | −40 °C to +125 °C |
The 24-pin VQFN package includes the following primary pin groups:
• VIN / VCC – Controller supply inputs • DRVH / DRVL – High-side and low-side MOSFET gate drivers • SW – Switch node sense • CS – Current-sense input • FB – Output voltage feedback • RT – Switching frequency programming • COMP – Loop compensation • EN – Enable/UVLO setting • EPAD – Thermal pad for heat spreading
LM5148RGYR uses the VQFN-24 (RGY) package with an exposed thermal pad. The package is optimized for compact DC-DC power stages and supports efficient thermal transfer into the PCB for high-power designs.
PCB layout should follow TI recommendations for:
• Minimizing high-di/dt loop area
• Proper placement of input/output capacitors
• Short, low-impedance gate drive routing
• Large copper area for EPAD heat spreading
Battery-powered ECUs, infotainment systems, camera modules and distributed power rails benefiting from the 65 V wide-input capability.
PLCs, factory automation, motor drivers, sensor gateways and industrial bus converters requiring robust transient performance.
Used in 24 V/48 V front-end systems, PoE devices, base stations and distributed point-of-load architectures.
Suitable for high-efficiency step-down rails supplying FPGAs, processors, DSP cores and mixed-signal subsystems.
Devices similar to LM5148RGYR include other high-voltage synchronous buck controllers from Texas Instruments, Analog Devices, onsemi and Microchip. Engineers usually compare operating voltage, MOSFET drive strength, control architecture and protection features.
Texas Instruments (TI) is a global leader in analog and power management ICs, offering strong long-term supply support and extensive documentation for industrial and automotive markets.
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