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LM5143-Q1

65V dual-channel synchronous buck controller

Uses external MOSFETs and inductors for dual outputs or a multiphase rail. It is not an integrated 40A module: current capability, thermals and transient margins depend on the complete power stage.

AutomotiveActiveExample package: VQFNP (RWG) · 40 pinVerified 2026-11-06

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5-second verdict

AutomotiveAEC-Q100 Grade 1

Temperature−40°C to +125°C (TA); +150°C max (TJ)

Functional safetyFunctional Safety-Capable

LifecycleActive

In one sentence: Qualification is grounded in this TI product's documentation; no grade is inferred from temperature. An ordering table may show junction or variant-specific limits, which must be distinguished from ambient conditions. TI explicitly lists Functional Safety-Capable. This is a device-documentation category, not system ASIL certification; assess the exact function, assumptions and safety manual.

Key specifications

Input range3.5–65 V

Channels2 interleaved synchronous buck channels

Adjustable output0.6–55 V; conversion constraints apply

Switching frequency100 kHz–2.2 MHz

Power stageExternal MOSFETs / inductors required

Low-IQ no-load mode (typical)15 µA: CH1 ultra-low-IQ standby only; see datasheet conditions

Orderable variants (OPNs)

The GPN is for selection; the full OPN is for ordering. These examples were observed on the verification date, not live stock. Variants may differ in package, temperature, gain/threshold and, for PMICs, NVM/sequencing. Distinguish TA from TJ in the exact datasheet.

OPN	Package	Temperature	Note
LM5143QRWGRQ1	VQFNP (RWG) · 40 pin	-40 to +150°C (TI OPN listing; verify TA/TJ)	Verify exact OPN, temperature definition and revision; not a stock claim.

LM5143QRWGRQ1-40 to +150°C (TI OPN listing; verify TA/TJ)

VQFNP (RWG) · 40 pinVerify exact OPN, temperature definition and revision; not a stock claim.

Official ordering page: https://www.ti.com/product/LM5143-Q1

Typical applications

Step-down from a protected 48V busDual-rail zone-controller power

FAQ

Does 65V eliminate load-dump protection?

No. Derive pin voltage from the OEM transient envelope, clamps and input filtering. Nominal bus voltage is not the worst case.

Why is no single output-current guarantee stated?

External switches, inductors, current sensing, PCB and cooling determine output capability; a selector-table current entry is not design validation.

How should I verify the LM5143-Q1 orderable?

The page lists 1 OPN examples from official material checked on 2026-11-06. Match package, function options and temperature definitions; obtain live price/stock from TI or authorized distributors.

Sources and verification

Related selection and design checks

All selection guides →What does TI Q1 mean →AEC-Q100 grades →Model Y TI BOM →

NuAxi is an independent semiconductor market-intelligence platform and is not affiliated with Texas Instruments. Information is for selection reference only and is not a design, certification or procurement guarantee; verify against TI's official datasheet, ordering page and terms.