Exact device and ordering identity
LM5148QRGYRQ1 is an automotive LM5148-Q1 synchronous buck controller supplied in the RGY 24-pin VQFN variant. It controls external power MOSFETs; the 80 V controller VIN capability does not mean the IC integrates an 80 V power module or magnetics. The Q1 ordering suffix and exact RGY footprint are part of the engineering and automotive procurement identity.
Operating and control considerations
TI specifies a 3.5–80 V input range, 100 kHz–2.2 MHz switching-frequency choices and selectable dual-random spread-spectrum operation to help manage EMI. Low shutdown and sleep currents are operating-mode figures, not estimates of converter efficiency under load. The controller can be configured for up to two phases, but correct power-stage synchronization, external components, compensation and MOSFET ratings remain application responsibilities.
Package, sourcing and engineering trade-offs
Selection against another automotive buck controller should compare switching node limits, the RGY package’s high-voltage pad spacing, supported gate drivers, selected frequency and CISPR system results. A different package in the same family can alter board creepage or assembly constraints. Confirm actual output rail targets and whether dual-phase operation is needed before approving an alternative or requesting exact QRGYRQ1 quantities.
Manufacturer-verified selection specifications
| Selection parameter | TI-verified value | Engineering condition |
|---|---|---|
| Vin | Wide input voltage range of 3.5V to 80V | Refer to exact manufacturer operating conditions |
| Shutdown current | 2.3 µA typical VIN shutdown current (EN = 0 V) | Refer to exact manufacturer operating conditions |
| Sleep current | 9.5 µA typical no-load sleep current (3.3 V output, PFM, not switching) | Refer to exact manufacturer operating conditions |
| Soft start | Internal soft-start ramp of 3ms | Refer to exact manufacturer operating conditions |
| Switching frequency | Switching frequency from 100kHz to 2.2MHz | Refer to exact manufacturer operating conditions |
| Dual phase | Stackable up to two phases | Refer to exact manufacturer operating conditions |
| Emi | dual random spread spectrum (DRSS) | Refer to exact manufacturer operating conditions |
| Catalog package | VQFN-24(3.5×5.5) | Match exact TI mechanical drawing before footprint or replacement approval |
For a simpler integrated-inductor power module that removes external power MOSFET selection, compare TPSM65630SVCGR, a 3 A buck module with a 3–65 V input range. This LM5148-Q1 instead controls external synchronous MOSFETs for a 3.5–80 V input design; it provides flexibility for higher-current or custom switching stages but requires a separate power inductor and careful gate-drive layout. This is an architecture comparison, not component interchangeability.
Procurement and datasheet
Request a quotation for LM5148QRGYRQ1 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.
