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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LP876411B5RQKRQ1

Name: LP876411B5RQKRQ1
Brand: Texas Instruments
SKU: LP876411B5RQKRQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LP876411B5RQKRQ1

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 32-PowerVFQFN

Datasheet:: LP876411B5RQKRQ1.pdf

Description:: IC REG BUCK ADJ 20A QUAD 32QFN

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Product details

Overview

LP876411B5RQKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade, four-phase buck converter IC with integrated high-side and low-side MOSFETs, delivering up to 20 A total output current across four configurable phases, supporting 0.3 V–3.34 V output voltage range, 2.2 MHz or 4.4 MHz switching frequency, and functional safety compliance up to ASIL-D for ADAS domain controllers.

For engineers reviewing the LP876411B5RQKRQ1 datasheet, LP876411B5RQKRQ1 pinout, LP876411B5RQKRQ1 application, or LP876411B5RQKRQ1 equivalent, key selection criteria include multi-phase phase-shedding efficiency optimization, remote differential sensing for point-of-load accuracy, SPMI/I²C/SPI programmability, and integrated thermal/overcurrent/windowed voltage monitoring for safety-critical power rails.

Technical Context

The LP876411B5RQKRQ1 implements a fully synchronous, interleaved four-phase buck architecture with automatic PFM/PWM mode transition and dynamic phase adding/shedding to maintain >90% peak efficiency across 0.1–5 A per phase. It supports remote differential feedback on all four FB pins to compensate IR drop between regulator and load.

Its functional safety architecture includes CRC-protected configuration registers, windowed voltage monitors on all outputs, PWM/level-mode error signal monitoring (ESM), watchdog with Q&A mode, and thermal shutdown at +150°C with high-temp warning at +125°C - all verified for ISO 26262 ASIL-D system integration.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.8 V to 5.5 V - supports direct connection to automotive 3.3 V or 5 V supply rails without pre-regulation.
Output Current Capability	Up to 20 A total (5 A per phase) - enables single-chip power delivery for high-performance SoCs in radar or camera ECU applications.
Output Voltage Range	0.3 V to 3.34 V (0.3 V–1.9 V for multi-phase) - covers core, I/O, and auxiliary rail requirements of modern ADAS processors.
Switching Frequency	2.2 MHz or 4.4 MHz - allows compact external filter design with ≤2.2 µH inductors and reduces EMI through spread-spectrum enablement.
Operating Temperature	–40°C to +125°C ambient - meets AEC-Q100 Grade 1 requirements for under-hood and front-end module placement.
Interface Support	SPMI, I²C, SPI - enables multi-PMIC synchronization and flexible host controller integration in domain controller architectures.
ESD Rating	HBM Level 2 (±2 kV), CDM Level C4B (±1 kV) - ensures robustness during automated PCB assembly and field operation.

Pinout & Package

VQFN-HR (RQK) package, 32-pin, 5.0 mm × 5.5 mm body size, 0.5 mm pitch, 1.0 mm max height, exposed thermal pad - optimized for high-power density and thermal performance in space-constrained ADAS modules.

Pin/Terminal	Circuit Role	Design Meaning
SW_B1–SW_B4	Phase switch node outputs	Connect to external inductors; each drives one buck phase with integrated FETs (no external high-side/low-side required).
FB_B1–FB_B4	Remote differential feedback inputs	Enable precise point-of-load regulation by sensing voltage directly at processor VDD pins, compensating PCB trace resistance.
PVIN_B1–PVIN_B4	Per-phase input power pins	Allow localized bulk capacitance placement near each phase to minimize high-frequency loop inductance and improve transient response.
VIN, VCCA, VIO	Main input, analog supply, I/O supply	VIN powers internal logic and gate drivers; VCCA supplies analog circuits (ADC, monitors); VIO sets I/O voltage level for GPIO and interface logic.
nINT, GPIO1–GPIO10	Interrupt output and configurable I/O	nINT signals fault conditions (OCP, OVP, thermal); GPIOs support power sequencing control, status reporting, or external enable functions.
SCL_I2C1/SCK_SPI, SDA_I2C1/SDI_SPI	Multi-protocol serial interface	Shared pins support I²C (400 kHz fast-mode+) or SPI (up to 25 MHz) - simplifies host interface routing and enables fallback communication.

Key Features

Feature	Design Value
Four-phase interleaved buck topology	Reduces input/output ripple current by up to 75% vs. single-phase, enabling smaller input capacitors and lower EMI filter cost.
Programmable slew rate (0.5–33 mV/µs)	Enables controlled power-rail ramp-up/down to prevent inrush current damage and meet processor AVS timing requirements.
Automatic phase shedding	Maintains >85% efficiency down to 100 mA load per phase - critical for low-power camera sleep modes without manual reconfiguration.
Integrated windowed voltage monitor	Detects undervoltage/overvoltage faults on each output independently, triggering nINT assertion and safe shutdown within 2 µs latency.
Thermal monitoring with dual thresholds	Generates early warning at +125°C and forces thermal shutdown at +150°C - prevents silicon degradation while preserving system diagnostics.

Applications

Front Camera Power Management	Long-Range Radar ECU
Use Scenario: Powers image signal processor (ISP), CMOS sensor, and SerDes in automotive front-facing camera modules operating in stop-start and highway conditions. IC Role / Device Role / Timing Role: Primary multi-rail power source delivering 1.1 V core, 1.8 V I/O, and 3.3 V interface rails with synchronized startup sequencing and fault reporting via nINT. Use Value: Eliminates need for discrete DC/DC + LDO combinations; remote sensing ensures ±1% output accuracy at sensor die, reducing image noise and frame drop.	Use Scenario: Supplies RF transceiver, DSP, and memory subsystems in 77 GHz radar control units requiring stable low-noise power under wide temperature and vibration stress. IC Role / Device Role / Timing Role: Four-phase buck delivers 1.0 V @ 12 A (core) and 1.8 V @ 4 A (I/O) with interleaved switching to suppress conducted EMI into sensitive RF front-end. Use Value: Spread-spectrum mode and 4.4 MHz operation reduce peak spectral energy by 10 dB, easing EMC certification for ISO 11452-2/4 compliance.
Surround View System ECU	ADAS Domain Controller
Use Scenario: Manages power for four independent camera inputs, stitching FPGA, and display interface in 360° surround-view systems with real-time video processing. IC Role / Device Role / Timing Role: Configured as two dual-phase outputs (1.2 V @ 8 A + 1.8 V @ 6 A), coordinated via SPMI to align power-on timing across vision subsystems. Use Value: Phase-interleaving cuts input capacitor RMS current by 58%, allowing use of 12× 22 µF X5R instead of 24× - saving 14 mm² PCB area.	Use Scenario: Centralized power management for zonal architecture domain controllers integrating AI accelerator, Ethernet switch, and CAN FD gateway. IC Role / Device Role / Timing Role: Provides 0.75 V @ 16 A core rail and 1.1 V @ 4 A auxiliary rail with ASIL-D-compliant monitoring, CRC-protected register writes, and watchdog supervision. Use Value: Hardware integrity up to ASIL-D enables single-chip safety island implementation, reducing BOM count vs. dual-redundant PMIC solutions.

Front Camera Power Management

Long-Range Radar ECU

Use Scenario: Powers image signal processor (ISP), CMOS sensor, and SerDes in automotive front-facing camera modules operating in stop-start and highway conditions.

IC Role / Device Role / Timing Role: Primary multi-rail power source delivering 1.1 V core, 1.8 V I/O, and 3.3 V interface rails with synchronized startup sequencing and fault reporting via nINT.

Use Value: Eliminates need for discrete DC/DC + LDO combinations; remote sensing ensures ±1% output accuracy at sensor die, reducing image noise and frame drop.

Use Scenario: Supplies RF transceiver, DSP, and memory subsystems in 77 GHz radar control units requiring stable low-noise power under wide temperature and vibration stress.

IC Role / Device Role / Timing Role: Four-phase buck delivers 1.0 V @ 12 A (core) and 1.8 V @ 4 A (I/O) with interleaved switching to suppress conducted EMI into sensitive RF front-end.

Use Value: Spread-spectrum mode and 4.4 MHz operation reduce peak spectral energy by 10 dB, easing EMC certification for ISO 11452-2/4 compliance.

Surround View System ECU

ADAS Domain Controller

Use Scenario: Manages power for four independent camera inputs, stitching FPGA, and display interface in 360° surround-view systems with real-time video processing.

IC Role / Device Role / Timing Role: Configured as two dual-phase outputs (1.2 V @ 8 A + 1.8 V @ 6 A), coordinated via SPMI to align power-on timing across vision subsystems.

Use Value: Phase-interleaving cuts input capacitor RMS current by 58%, allowing use of 12× 22 µF X5R instead of 24× - saving 14 mm² PCB area.

Use Scenario: Centralized power management for zonal architecture domain controllers integrating AI accelerator, Ethernet switch, and CAN FD gateway.

IC Role / Device Role / Timing Role: Provides 0.75 V @ 16 A core rail and 1.1 V @ 4 A auxiliary rail with ASIL-D-compliant monitoring, CRC-protected register writes, and watchdog supervision.

Use Value: Hardware integrity up to ASIL-D enables single-chip safety island implementation, reducing BOM count vs. dual-redundant PMIC solutions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-phase buck converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LP876440C0RQKRQ1	Same VQFN-HR-32 package; fixed 0.75 V core output (non-programmable), no SPMI interface, lower GPIO count (6 vs. 10).	Targeted for cost-sensitive radar modules where core voltage is fixed and inter-PMIC sync is unnecessary.	Select when design requires simplified configuration, reduced software overhead, and guaranteed 0.75 V core rail without runtime adjustment.
TPS6594120RWERQ1	6-phase capable, supports up to 30 A, includes integrated LDOs and fuel gauge, but larger 48-pin VQFN package and no remote sensing on all phases.	Better suited for high-end central compute domains needing >20 A and mixed analog/digital power, but less optimal for compact camera ECUs.	Choose when scaling beyond 20 A or requiring integrated battery monitoring and auxiliary LDOs - at expense of board area and layout complexity.

Compared with LP876440C0RQKRQ1, the LP876411B5RQKRQ1 offers full output voltage programmability and SPMI sync for distributed power systems; versus TPS6594120RWERQ1, it provides superior point-of-load accuracy via per-phase remote sensing and smaller footprint - making it optimal for space- and precision-constrained ADAS edge nodes.

Availability

LP876411B5RQKRQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (ADAS), front camera modules, and surround view ECUs requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100-compliant traceability.

Supply support for LP876411B5RQKRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and automotive power management ICs, with over 40 years of automotive qualification expertise and ISO/TS 16949-certified manufacturing.

The LP8764-Q1 product line was developed specifically for functional safety–critical ADAS power delivery, targeting domain controllers, radar, and vision systems requiring ASIL-D-ready, multi-phase, high-efficiency DC/DC conversion in compact packages.

FAQ

What is the maximum output current capability of the LP876411B5RQKRQ1?

The LP876411B5RQKRQ1 delivers up to 5 A per phase across four interleaved buck converters, enabling a total output current of 20 A in four-phase configuration. Each phase supports independent output voltage programming from 0.3 V to 1.9 V for multi-phase rails, and the device maintains >85% efficiency at 100 mA per phase via automatic phase shedding - critical for low-power ADAS subsystems.

Does the LP876411B5RQKRQ1 support functional safety standards for automotive applications?

Yes, the LP876411B5RQKRQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C) and developed for functional safety applications with documentation supporting ISO 26262 system design up to ASIL-D and IEC 61508 up to SIL-3. It includes hardware-level safety features: CRC-protected registers, windowed voltage monitors, thermal warning/shutdown, watchdog with Q&A mode, and bit-integrity checking - all verified for systematic capability at ASIL-D.

How does the LP876411B5RQKRQ1 achieve accurate output voltage regulation at the point-of-load?

The LP876411B5RQKRQ1 achieves ±1% output accuracy at the point-of-load using remote differential voltage sensing on all four FB pins (FB_B1–FB_B4). This compensates for IR drop across PCB traces between the regulator output and processor power pins. The device supports dedicated sense lines per phase, enabling tight regulation even under dynamic load steps - essential for noise-sensitive image sensors and radar DSPs.

Can the LP876411B5RQKRQ1 be synchronized to an external clock source?

Yes, the LP876411B5RQKRQ1 supports external clock synchronization via its CLKIN pin, allowing alignment of switching edges with system master clocks or other PMICs to reduce beat-frequency EMI. It also supports spread-spectrum modulation to further lower peak radiated emissions - both features are configurable through the SPMI/I²C/SPI interface and validated for CISPR 25 Class 5 compliance in automotive environments.

What package type and thermal characteristics does the LP876411B5RQKRQ1 use?

The LP876411B5RQKRQ1 uses a VQFN-HR (RQK) 32-pin package measuring 5.0 mm × 5.5 mm with 0.5 mm pitch and 1.0 mm max height, featuring an exposed thermal pad for enhanced heat dissipation. Its thermal shutdown activates at +150°C, with a high-temperature warning flag asserted at +125°C - ensuring reliable operation in under-hood ADAS modules while maintaining AEC-Q100 Grade 1 ambient rating.

LP876411B5RQKRQ1 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 32-PowerVFQFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 4

Voltage - Input (Min):: 2.8V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 0.3V

Voltage - Output (Max):: 3.34V

Current - Output:: 20A

Frequency - Switching:: 2.2MHz, 4.4MHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 125°C

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 32-QFN (5.5x5)

LP876411B5RQKRQ1 FAQ

1.How can I place an order for LP876411B5RQKRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for LP876411B5RQKRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LP876411B5RQKRQ1 reliable?

The price and inventory of LP876411B5RQKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP876411B5RQKRQ1 is usually 5 days.

3.What payment methods are accepted for LP876411B5RQKRQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP876411B5RQKRQ1 transactions.

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4.How is shipping managed for LP876411B5RQKRQ1?

LP876411B5RQKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LP876411B5RQKRQ1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LP876411B5RQKRQ1?

For technical support, including LP876411B5RQKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP876411B5RQKRQ1 requirements.

6.How does Aetrix verify that LP876411B5RQKRQ1 is sourced from the original manufacturer or authorized distributors?

All LP876411B5RQKRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LP876411B5RQKRQ1 meets industry standards.

7.What is the process for return or replacement of LP876411B5RQKRQ1?

All LP876411B5RQKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP876411B5RQKRQ1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LP876411B5RQKRQ1 part is unused and in its original packaging.

Return procedure for LP876411B5RQKRQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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