Exact device and ordering identity
LV5144RGYR is a high-input-voltage synchronous buck-controller IC in a 20-terminal RGY VQFN wettable-flank package. It drives external MOSFETs to make a regulated DC rail from 48 V industrial distribution or other high-voltage sources, rather than integrating a high-current power stage. This architecture lets engineers choose switches and inductors for their own current requirements. The RGY footprint and programmable control connections must match the exact board; a standard eight-pin buck regulator cannot replace the LV5144 controller without power-stage redesign.
Operating and control considerations
The original TI data sheet specifies normal 6–95 V VIN and adjustable 0.8–60 V output capability under defined topology and component limits. A 45 ns minimum high-side on-time supports high step-down ratios while 145 ns minimum off-time helps large duty-cycle operation at low VIN. These timing numbers must be combined with switching frequency, MOSFET gate charge and the required VOUT/VIN ratio; they are not a promise of zero-dropout conversion. Configurable RDS(on) or shunt current sensing affects efficiency, layout and accuracy. Frequency synchronization, forced PWM, diode emulation and thermal/protection functions are source-defined features requiring external circuit design.
Package, sourcing and engineering trade-offs
Relevant replacement criteria are the 95 V input ceiling, external N-MOSFET gate-drive ratings, pin-by-pin 20-contact routing, feedback compensation, current-sense method, current-limit polarity and wettable-flank soldering. For an RFQ include LV5144RGYR, VIN surge envelope, VOUT, load power, switching frequency and MOSFET/inductor selection. Compare TI documentation to the exact orderable package before presenting any other high-voltage buck controller as a substitute.
Manufacturer-verified selection specifications
| Selection parameter | TI-verified value | Engineering condition |
|---|---|---|
| Vin | 6-V to 95-V wide input voltage range | Refer to exact manufacturer operating conditions |
| Vout | 0.8-V to 60-V adjustable output voltage | Refer to exact manufacturer operating conditions |
| Min on | 45-ns tON(min) for high VIN / VOUT ratio | Refer to exact manufacturer operating conditions |
| Min off | 145-ns tOFF(min) for low dropout | Refer to exact manufacturer operating conditions |
| Freq | 100-kHz to 1-MHz switching frequency | Refer to exact manufacturer operating conditions |
| Current sense | Lossless RDS(on) or shunt current sensing | Refer to exact manufacturer operating conditions |
| Package | 20-pin VQFN package with wettable flanks | Use original mechanical drawing |
| Catalog package | VQFN-20-EP(3.5×4.5) | Match exact TI mechanical drawing before footprint or replacement approval |
Procurement and datasheet
Request a quotation for LV5144RGYR using the complete orderable number, target quantity and package requirement. Stock, pricing and delivery timing require a direct RFQ confirmation; no on-page availability or price is promised. Source-listed alternative candidates, where present, are for engineering evaluation and do not establish drop-in compatibility.
