PACKAGE REFERENCEVQFNP-40Confirm case, pinout and ordering suffix before purchase.

MANUFACTURER PART RECORD

LM5143QRWGRQ1

LM5143QRWGRQ1 is a Texas Instruments AEC-Q100 Grade 1 dual synchronous buck controller in 40-pin VQFNP (6x6mm) — for high-current automotive power stages: mild-hybrid DC-DC, server-style multiphase rails adapted for automotive, and high-power infotainment. A wide input range, dual interleaved channels delivering high output current, a high maximum junction temperature, and CISPR25 Class 5 EMI performance with spread spectrum. Heat evidence: the mild-hybrid board-net is the key enabler for its efficiency — dual-phase controllers that handle high-voltage transients are critical for next-generation power distribution. Selection advice: the dual-channel architecture suits 2-phase single-output or dual-output designs — for single-phase the LM5141-Q1 is simpler; the short minimum on-time handles high step-down ratios. AEC-Q100 Grade 1 qualified for the automotive temperature range. Parameters verified against Texas Instruments documentation.

Power ManagementDC-DC controllerVQFNP-40

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MPN: LM5143QRWGRQ1
Manufacturer: Texas Instruments
Family: DC-DC controller
Package: VQFNP-40
Manufacturer channel coverage: Checked by RFQ
Data last checked: Commercial check required
Required order checks: Suffix, package, date code, lot, source and traceability

PROCUREMENT DATA

Identity and sourcing requirements.

MANUFACTURER DATA REVIEW

Key technical specifications

Ordering-code highlights reviewed against official manufacturer documentation.

Function: Dual-channel synchronous buck controller · automotive (Q1); channels can be paralleled into a multiphase single output and two devices can be stacked
Input voltage range: 3.5 V to 65 V · Absolute maximum: 70 V at VIN and the SW pins, not an operating value
Output setpoints: Fixed 3.3 V (3.267 V to 3.33 V) or 5 V (4.95 V to 5.05 V), or adjustable 0.6 V to 55 V against the 0.6 V feedback threshold · set by FB/MODE strapping on the same silicon
Current-limit threshold: 73 mV typical · 66 mV to 80 mV, CS pin to VOUT
Switching frequency: 100 kHz to 2.2 MHz · resistor-programmed via RT (200 kHz / 220 kHz / 242 kHz min/typ/max at RT = 100 kΩ)
VCC regulation: 5 V typical · 4.7 V to 5.3 V at IVCC = 100 mA
Shutdown / standby current: Shutdown 3.3 µA typical / 7 µA maximum · at VIN = 12 V, VEN1 = VEN2 = 0 V; standby (VIN = 12 V, in regulation, no-load, not switching) 15 µA typical in ultra-low-IQ mode versus 24 µA typical in normal standby (channel 1)
Gate driver peak current: 3.25 A source / 4.25 A sink typical · high-side driver, source figure at VHB = 5 V
Power-good threshold: 92% typical · 90% to 94% of the regulation voltage, falling
Order-code package: VQFN (RWG), 40 pins · the only orderable in SNVSB29C, device marking LM5143, −40°C to 150°C junction
Manufacturer packing: Large tape and reel, 2,500 · packing quantity, not stock or MOQ

Source: TI SNVSB29C (Rev. C, June 2021) · §7.1 Absolute Maximum Ratings, §7.3 Recommended Operating Conditions, §7.5 Electrical Characteristics; Package Option Addendum · Reviewed 2026-10-30

Sourcing note

Confirm voltage, current, thermal design, package and packing suffix before purchase.

Before you request a quote

Keep the automotive grade separate
The Q…Q1 suffixes denote the automotive-grade part. A non-Q catalog LM5143 sibling exists and is listed by the datasheet only as another qualified version — do not substitute it for a Q1 requirement, or the reverse.
Confirm the strapping, not just the silicon
Fixed 3.3 V, fixed 5 V and adjustable operation come from the same device via FB/MODE strapping, and the channel mode sets single-output multiphase versus dual-output behaviour. State the board strapping the design uses so the delivered configuration matches.

Official documentation

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COMMON QUESTIONS

LM5143QRWGRQ1 FAQ

Is LM5143QRWGRQ1 automotive-qualified?

The LM5143QRWGRQ1 ordering code carries the manufacturer's automotive qualification marker. Qualification grade, temperature range and PPAP documentation depend on the exact lot offered, so state your automotive documentation requirements (PPAP level, AEC test reports) in the RFQ and we will confirm them against the offered lot before quotation.

What are the key specifications of LM5143QRWGRQ1?

From the verified technical profile: Function: Dual-channel synchronous buck controller · automotive (Q1); channels can be paralleled into a multiphase single output and two devices can be stacked; Input voltage range: 3.5 V to 65 V · Absolute maximum: 70 V at VIN and the SW pins, not an operating value; Output setpoints: Fixed 3.3 V (3.267 V to 3.33 V) or 5 V (4.95 V to 5.05 V), or adjustable 0.6 V to 55 V against the 0.6 V feedback threshold · set by FB/MODE strapping on the same silicon. These are the catalog-recorded values for LM5143QRWGRQ1 — always re-check them against the manufacturer datasheet revision quoted on your BOM before finalizing the design.