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Texas Instruments LP876441B1RQKRQ1
- Part No.:
- LP876441B1RQKRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 32-PowerVFQFN
- Datasheet:
-
LP876441B1RQKRQ1.pdf
- Description:
- IC REG BUCK ADJ 20A QUAD 32QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP876441B1RQKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified four-phase buck converter IC with integrated FETs, delivering up to 20 A total output current (5 A per phase), 0.3 V–3.34 V programmable output voltage, and 2.2/4.4 MHz switching frequency - used in ADAS domain controllers for high-efficiency, safety-critical power delivery to SoCs and image sensors.
For engineers reviewing the LP876441B1RQKRQ1 datasheet, LP876441B1RQKRQ1 pinout, LP876441B1RQKRQ1 application, or LP876441B1RQKRQ1 equivalent, key selection criteria include ASIL-D functional safety support, SPMI/I²C/SPI configurability, remote differential sensing for multi-phase POL accuracy, and thermal/overcurrent/windowed voltage monitoring with CRC-protected registers.
Technical Context
The LP876441B1RQKRQ1 implements four synchronous buck converter cores configurable as 1–4 phases, supporting automatic PFM/PWM mode transition and dynamic phase shedding/addition to maximize efficiency across 0–20 A load range. Its control architecture includes windowed voltage monitors, PWM-level error signal monitoring (ESM), and a watchdog with selectable trigger/Q&A mode.
It integrates 10 configurable GPIOs, supports external clock synchronization and spread-spectrum modulation, and provides remote differential feedback for each phase to compensate IR drop between regulator and point-of-load - critical for sub-1% output voltage accuracy in radar and camera modules.
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 rails without pre-regulation. |
| Output Current | Up to 20 A total (5 A per phase) - enables single-chip power delivery for multi-core ADAS processors. |
| 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 vision SoCs. |
| Switching Frequency | 2.2 MHz or 4.4 MHz - allows compact external inductor/capacitor selection and avoids AM radio band interference. |
| Operating Temperature | –40°C to +125°C ambient - qualified for under-hood and ECU-mounted automotive applications. |
| Functional Safety | ASIL-D systematic capability & hardware integrity - enables use in ISO 26262-compliant safety architectures without additional safety mechanisms. |
| Interface | SPMI, I²C, SPI - enables multi-PMIC synchronization and flexible host controller integration in domain controllers. |
| ESD Rating | HBM Level 2 (±2 kV), CDM Level C4B (±1.5 kV) - meets automotive board-level ESD robustness requirements. |
Pinout & Package
VQFN-HR (RQK) package, 32-pin, 5.5 mm × 5.0 mm body size, 1.0 mm max height, exposed thermal pad, RoHS-compliant NiPdAu/Sn lead finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW_B1–SW_B4 | High-side switch node outputs | Connect to external inductors for each buck phase; requires low-inductance layout for EMI and efficiency. |
| PVIN_B1–PVIN_B4 | Phase input voltage supplies | Independent input pins per phase allow localized bulk capacitance and noise isolation between phases. |
| FB_B1–FB_B4 | Remote differential feedback inputs | Enable Kelvin sensing at point-of-load to maintain ±0.5% output regulation despite PCB trace resistance. |
| VIN | Main input supply | Supplies internal LDOs and logic circuitry; decoupled separately from PVIN paths. |
| VCCA | Analog reference supply | Provides clean bias for ADCs, comparators, and monitoring circuits; must be filtered independently. |
| nINT | Interrupt output | Active-low open-drain signal indicating fault conditions (OVP, UVLO, thermal warning, register CRC error). |
| SCL_I2C1/SCK_SPI | Serial interface clock | Dual-function pin supporting I²C clock or SPI clock - selected via configuration register at power-up. |
| SDA_I2C1/SDI_SPI | Serial interface data | Dual-function pin supporting I²C data or SPI data-in - mode determined by interface initialization sequence. |
| GPIO1–GPIO10 | Configurable general-purpose I/O | Programmable as inputs, outputs, or peripheral functions (e.g., enable signals, status indicators, reset controls). |
| GNDs | Power and analog ground planes | Multiple dedicated GND pins reduce ground bounce and improve noise immunity in high-dI/dt multi-phase operation. |
Key Features
| Feature | Design Value |
|---|---|
| Four-phase buck architecture with phase shedding | Maintains >85% efficiency from 100 mA to 20 A load, eliminating need for discrete phase management logic. |
| ASIL-D functional safety compliance | Includes CRC on configuration registers and NVM, thermal shutdown, windowed voltage monitoring, and watchdog - reduces system-level FMEDA effort. |
| Remote differential voltage sensing per phase | Compensates for up to 50 mΩ PCB trace resistance, enabling ±0.5% output accuracy at point-of-load without external compensation networks. |
| Multi-interface support (SPMI/I²C/SPI) | Enables seamless integration into TI Jacinto™-based domain controllers and interoperability with existing SPMI PMIC ecosystems. |
| Spread-spectrum and external sync capability | Reduces peak EMI by >10 dB and allows deterministic timing alignment across multiple converters in radar/camera fusion systems. |
| Configurable slew rate (0.5–33 mV/µs) | Prevents inrush current during power-up and enables controlled sequencing with companion devices like LP87524. |
Applications
| Front Camera Power Supply | Long-Range Radar ECU |
|---|---|
Use Scenario: Powers 5–8 MP image sensor, ISP, and MIPI PHY in automotive front-facing camera module. IC Role / Device Role / Timing Role: Primary multi-rail power source delivering 0.85 V core, 1.1 V memory, and 1.8 V I/O with precise sequencing and dynamic voltage scaling. Use Value: Four-phase interleaving reduces output ripple to <15 mVpp, minimizing sensor noise and enabling <60 dB SNR in low-light imaging. |
Use Scenario: Supplies RF transceiver, DSP, and ADC in 77 GHz radar processing unit mounted near front bumper. IC Role / Device Role / Timing Role: High-current, low-noise power stage with thermal monitoring and fault reporting for mission-critical radar operation. Use Value: ASIL-D monitoring ensures immediate shutdown on overtemperature (>125°C) or overcurrent (>5.5 A/phase), preventing false positives in object detection. |
| Surround View System ECU | ADAS Domain Controller |
Use Scenario: Powers four independent camera SoCs (front/rear/left/right) and Ethernet switch in 360° surround-view processing unit. IC Role / Device Role / Timing Role: Configured as four independent 1-phase converters, each powering one camera subsystem with isolated feedback and enable control. Use Value: Independent GPIO control enables staggered power-up sequencing, limiting inrush current to <3 A peak and avoiding 12 V battery droop. |
Use Scenario: Provides core, GPU, and memory rails for centralized ADAS domain controller running perception, planning, and vehicle control software. IC Role / Device Role / Timing Role: Four-phase 20 A output powers 16 nm SoC with dynamic DVFS, synchronized via SPMI to companion LP87524 for auxiliary rails. Use Value: Remote sensing and 0.5 mV/µs–33 mV/µs slew-rate control ensure stable 0.75 V core rail during 2 GHz CPU burst loads with <2% transient deviation. |
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 |
|---|---|---|---|
| LP87524B1RQKRQ1 | 4-phase, 16 A max, fixed 0.3–1.52 V output range, no SPMI, only I²C/SPI | Lacks ASIL-D documentation and windowed voltage monitoring; limited to ASIL-B systems | Choose when functional safety certification is not required and lower max current suffices. |
| TPS659412ARSLRQ1 | 6-channel PMIC with 2x 4-A buck + 4x LDOs; no multi-phase buck; 0.5–3.3 V output; I²C-only | Integrated LDOs simplify BOM but lack phase-interleaved ripple reduction and remote sensing | Choose when mixed-rail (buck + LDO) consolidation outweighs ripple performance and POL accuracy needs. |
Compared with LP876441B1RQKRQ1, LP87524B1RQKRQ1 offers lower cost and footprint but omits ASIL-D support and remote sensing, while TPS659412ARSLRQ1 trades multi-phase efficiency for integrated LDO flexibility - making LP876441B1RQKRQ1 optimal for high-current, safety-critical, low-ripple ADAS power nodes.
Availability
LP876441B1RQKRQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (ADAS), front camera modules, and long-range radar ECUs requiring stable component supply, automotive-grade lifecycle assurance, and functional safety-compliant sourcing.
Supply support for LP876441B1RQKRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive power management and functional safety solutions.
The LP8764-Q1 product line was designed specifically for safety-critical automotive power delivery - targeting ADAS domain controllers, radar, and vision systems requiring ASIL-D compliance, high efficiency, and multi-phase scalability.
FAQ
What is the maximum output current capability of the LP876441B1RQKRQ1?
The LP876441B1RQKRQ1 delivers up to 5 A per phase across four phases, supporting a total output current of 20 A in 4-phase configuration. Each phase operates independently with its own SW node, PVIN, and FB input, allowing full utilization of thermal and electrical headroom. The device maintains this rating within its –40°C to +125°C ambient operating range and under AEC-Q100 Grade 1 conditions.
Does the LP876441B1RQKRQ1 support functional safety certification for ASIL-D systems?
Yes, the LP876441B1RQKRQ1 is developed for functional safety applications with documented systematic capability and hardware integrity up to ASIL-D per ISO 26262. It includes windowed voltage monitoring, overcurrent detection, thermal shutdown with warning, watchdog timer with Q&A mode, and CRC protection on configuration registers and non-volatile memory - all verified and supported by TI's functional safety documentation package.
How does remote differential sensing work on the LP876441B1RQKRQ1?
The LP876441B1RQKRQ1 provides dedicated FB_B1–FB_B4 pins for remote differential voltage sensing on each phase. These inputs measure voltage directly at the point-of-load (e.g., SoC VDD pin), compensating for IR drop across PCB traces. This enables ±0.5% output voltage accuracy regardless of trace resistance up to 50 mΩ, which is essential for stable operation of low-voltage, high-current processor cores in ADAS applications.
Which serial interfaces does the LP876441B1RQKRQ1 support for configuration and monitoring?
The LP876441B1RQKRQ1 supports three serial interfaces: SPMI (Scalable Platform Management Interface), I²C, and SPI. SPMI enables multi-PMIC synchronization in complex domain controllers; I²C and SPI provide backward compatibility and flexibility for host MCU integration. Interface selection is determined at power-up via strap pins or register configuration, and all interfaces support full read/write access to all control and status registers.
What package type and thermal characteristics does the LP876441B1RQKRQ1 use?
The LP876441B1RQKRQ1 uses a VQFN-HR (RQK) package: 32-pin, 5.5 mm × 5.0 mm body, 1.0 mm max height, with an exposed thermal pad. It has an MSL Level-2-260°C-1 year rating and NiPdAu/Sn lead finish. Thermal resistance (θJA) is 32°C/W typical on a 2-layer board with 1-in² 2-oz copper pour under the exposed pad, enabling reliable operation at full 20 A load in automotive under-hood environments.
LP876441B1RQKRQ1 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-QFN (5.5x5)
LP876441B1RQKRQ1 FAQ
1.How can I place an order for LP876441B1RQKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP876441B1RQKRQ1 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 LP876441B1RQKRQ1 reliable?
The price and inventory of LP876441B1RQKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP876441B1RQKRQ1 is usually 5 days.
3.What payment methods are accepted for LP876441B1RQKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP876441B1RQKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP876441B1RQKRQ1?
LP876441B1RQKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP876441B1RQKRQ1 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 LP876441B1RQKRQ1?
For technical support, including LP876441B1RQKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP876441B1RQKRQ1 requirements.
6.How does Aetrix verify that LP876441B1RQKRQ1 is sourced from the original manufacturer or authorized distributors?
All LP876441B1RQKRQ1 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 LP876441B1RQKRQ1 meets industry standards.
7.What is the process for return or replacement of LP876441B1RQKRQ1?
All LP876441B1RQKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP876441B1RQKRQ1, 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 LP876441B1RQKRQ1 part is unused and in its original packaging.
Return procedure for LP876441B1RQKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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