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Texas Instruments LP875651RNFRQ1
- Part No.:
- LP875651RNFRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 26-PowerVFQFN
- Datasheet:
-
LP875651RNFRQ1.pdf
- Description:
- IC REG BUCK ADJ 8A/8A DL 26VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,717
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Product details
Overview
LP875651RNFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive buck converter IC with two independent 2-phase DC/DC outputs, delivering up to 8 A per output (16 A total), 0.6 V–3.36 V programmable output voltage, 2 MHz fixed switching frequency, and I²C interface supporting up to 3.4 MHz. It serves as a multi-rail power management solution for radar and camera domain controllers requiring precise sequencing, remote sensing, and dynamic phase control.
For engineers reviewing the LP875651RNFRQ1 datasheet, LP875651RNFRQ1 pinout, LP875651RNFRQ1 application, or LP875651RNFRQ1 equivalent, key selection criteria include its dual 2-phase configuration, integrated high-side/low-side FETs (RDS(on) = 29/17 mΩ typ), programmable slew rate (0.47–10 mV/µs), PGOOD monitoring with ±14 mV threshold, and automotive-grade thermal protection (140°C shutdown).
Technical Context
The LP875651RNFRQ1 implements four synchronous buck cores configured exclusively as two independent 2-phase outputs-enabling balanced current sharing, interleaved operation, and reduced input/output ripple. Each 2-phase rail supports remote differential voltage sensing (FBBx pairs) to compensate for PCB IR drop at point-of-load.
Its digital control architecture uses AUTO mode PWM/PFM transition (600 mA PFM→PWM, 200 mA PWM→PFM), programmable phase add/shed thresholds (e.g., 1→2-phase at 1 A), and I²C-configurable registers for voltage, slew rate, sequencing, and interrupt masking-without requiring external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8 V to 5.5 V - supports direct connection to automotive battery rails with cold-crank tolerance down to 2.8 V. |
| Output Configuration | Two independent 2-phase buck outputs - enables dual high-current rails (e.g., 1.2 V @ 8 A + 1.8 V @ 8 A) with phase interleaving for lower EMI. |
| Max Output Current | 8 A per 2-phase rail (16 A total) - sustained delivery with thermal derating above 125°C ambient per AEC-Q100 Grade 1 spec. |
| Switching Frequency | 2 MHz (±10%) - allows use of compact 0.47 µH inductors and reduces audible noise in vehicle cabin environments. |
| Output Voltage Accuracy | ±2% (≥1 V) or ±20 mV (<1 V) in PWM mode - ensures stable core voltage for ADAS SoCs under load and line transients. |
| I²C Interface Speed | Up to 3.4 MHz (High-Speed mode) - enables fast register writes for dynamic voltage scaling during radar frame transitions. |
| Thermal Protection | 140°C junction shutdown with 20°C hysteresis - prevents latch-up during sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
VQFN-HR (RNF) 26-pin package, 4.50 mm × 4.00 mm body, 0.35 mm pitch, with exposed thermal pad (AGND-connected) for enhanced thermal dissipation in automotive under-hood applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW_B0, SW_B1, SW_B2, SW_B3 | Buck switch node (x4) | Connects to external inductor; each pair (B0/B1, B2/B3) forms one 2-phase output stage with interleaved timing. |
| FB_B0–FB_B3 | Feedback input (x4) | Differential sense inputs - FB_B0/FB_B1 for rail 0, FB_B2/FB_B3 for rail 1 - enable remote sensing to correct for PCB voltage drop. |
| VIN_B0–VIN_B3 | Input power (x4) | Independent input pins per phase - must be externally tied together and locally bypassed to minimize high-frequency noise coupling. |
| EN1, EN2, EN3 | Configurable GPIO/enable (x3) | Programmable as enable signals for buck rails or GPIOs to sequence external LDOs, load switches, or processor reset lines. |
| SDA, SCL | I²C bidirectional data/clock | Support standard/fast/fast+/high-speed modes - requires external 10 kΩ pull-ups to VANA for reliable communication in noisy automotive environments. |
| PGOOD | Power-good open-drain output | Asserts after soft-start and voltage regulation; threshold ±14 mV around final VOUT - used for system-level power sequencing validation. |
| nINT | Interrupt request output | Active-low open-drain signal indicating fault conditions (OVP, UVLO, thermal warning) - maskable via I²C register. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable multi-phase topology | Fixed dual-2-phase mode - eliminates need for external phase controllers while maintaining optimal current balance and ripple cancellation. |
| Programmable output slew rate | 0.47–10 mV/µs range - minimizes inrush current and output overshoot during startup/voltage transitions critical for sensitive image sensors. |
| Integrated current measurement | 20.47 A full-scale range, 20 mA LSB - enables real-time load monitoring without external sense resistors, reducing BOM cost and board area. |
| Spread-spectrum & phase interleaving | Reduces peak EMI amplitude by spreading energy across frequency band and canceling ripple harmonics between phases. |
| Automotive safety features | AEC-Q100 Grade 1 qualified, HBM ±2 kV / CDM ±500 V ESD, thermal warning (115–147°C), and overvoltage/undervoltage lockout on all rails. |
Applications
| Radar Processing Unit Power | ADAS Camera Module Power |
|---|---|
Use Scenario: Supplies core voltage (1.0 V) and I/O voltage (1.8 V) to 77 GHz radar SoCs in front-end modules operating in engine bay environments. IC Role / Device Role / Timing Role: Dual 2-phase buck regulator providing tightly regulated, low-noise, sequenced power with remote sensing to compensate for long PCB traces. Use Value: Maintains <±2% output accuracy across –40°C to +125°C ambient and 2.8–5.5 V input, ensuring deterministic radar processing timing and ADC reference stability. |
Use Scenario: Powers high-resolution CMOS image sensor and ISP in surround-view camera systems mounted behind grilles or bumpers. IC Role / Device Role / Timing Role: Delivers 1.2 V @ 8 A and 2.8 V @ 4 A with programmable slew rate to prevent image artifacts during rapid scene changes. Use Value: Achieves <3 mVp-p ripple in 4-phase mode and supports dynamic voltage scaling via I²C to reduce power during idle frames. |
| Automotive Domain Controller Power | Centralized ADAS Gateway Power |
Use Scenario: Provides multiple voltage rails to heterogeneous compute clusters (CPU, GPU, NPU) in zonal architecture domain controllers. IC Role / Device Role / Timing Role: Two independent 2-phase regulators synchronized via external CLKIN to minimize beat frequencies and simplify EMI filtering. Use Value: Enables precise power-on sequencing (via ENx GPIOs) and fault reporting (nINT) to meet ASIL-B functional safety requirements. |
Use Scenario: Supplies power to Ethernet AVB switch, CAN FD transceivers, and security MCU in centralized gateway ECUs. IC Role / Device Role / Timing Role: Generates isolated 3.3 V and 1.8 V rails with PGOOD monitoring and thermal warning to support fail-safe shutdown protocols. Use Value: Integrates overtemperature warning (115–147°C configurable) and shutdown (140°C) to prevent thermal runaway in sealed metal housings. |
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 |
|---|---|---|---|
| LP875621RNFRQ1 | One 3-phase + one 1-phase output (12 A + 4 A); different phase allocation and current balancing logic. | Suitable for asymmetric loads (e.g., main SoC + auxiliary peripheral), not dual symmetric rails. | Select when system requires non-matching current capability per rail and accepts higher ripple on 1-phase output. |
| LP875641RNFRQ1 | Four independent 1-phase outputs (4 × 4 A); no phase interleaving or current sharing between rails. | Optimized for distributed low-power rails (e.g., multiple sensors, SerDes, memory), not high-current dual-domain supplies. | Choose when flexibility in per-rail voltage programming outweighs ripple and efficiency benefits of multiphase operation. |
Compared with LP875621RNFRQ1 and LP875641RNFRQ1, the LP875651RNFRQ1 uniquely delivers matched 8 A/8 A dual 2-phase capability-providing superior ripple cancellation, thermal distribution, and efficiency at mid-to-high load for radar/camera domain controllers where rail symmetry and EMI control are critical.
Availability
LP875651RNFRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS radar, and camera power applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LP875651RNFRQ1 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 electronics, with decades of experience in high-reliability power management ICs.
The LP8756x-Q1 product line was designed specifically for automotive ADAS and infotainment systems, integrating multi-phase buck conversion, I²C configurability, and AEC-Q100 safety features into compact packages for space-constrained ECUs.
FAQ
What is the exact multi-phase configuration supported by the LP875651RNFRQ1?
The LP875651RNFRQ1 is factory-configured for two independent 2-phase buck outputs-meaning it operates exclusively as two separate 2-phase rails (e.g., BUCK0+BUCK1 as Rail A, BUCK2+BUCK3 as Rail B). It does not support 4-phase, 3+1-phase, or 1-phase-per-rail modes. This fixed topology ensures optimal current sharing and ripple cancellation for dual high-current applications like radar and camera processors.
Does the LP875651RNFRQ1 require external current-sense resistors for load monitoring?
No, the LP875651RNFRQ1 integrates on-die current measurement circuitry with 20 mA LSB resolution and up to 20.47 A full-scale range. It reports real-time output current via I²C register reads without needing external sense resistors-reducing BOM cost, board area, and power loss associated with discrete sensing.
How does the LP875651RNFRQ1 handle thermal management in automotive environments?
The LP875651RNFRQ1 includes programmable thermal warning (115–147°C) and hard thermal shutdown at 140°C (with 20°C hysteresis). Its VQFN-HR package features an exposed thermal pad tied to AGND, enabling efficient heat transfer to the PCB. Combined with junction temperature monitoring via I²C, it supports predictive thermal throttling in radar and camera ECUs operating under hood temperatures up to +125°C ambient.
Can the LP875651RNFRQ1 synchronize its switching clock to an external source?
Yes, the LP875651RNFRQ1 accepts an external clock on the CLKIN pin (1–24 MHz nominal) to synchronize switching across multiple devices or to avoid beat frequencies with other system clocks. Clock detection includes 1.8 µs missing-clock timeout and 20 µs debounce, ensuring robust operation in electrically noisy automotive domains.
What is the purpose of the FB_Bx pin pairing (e.g., FB_B0/FB_B1) on the LP875651RNFRQ1?
Each pair of FB pins (FB_B0/FB_B1 for Rail 0; FB_B2/FB_B3 for Rail 1) enables true remote differential voltage sensing. The IC measures the voltage difference between the positive feedback pin (e.g., FB_B0) and the negative feedback pin (e.g., FB_B1), compensating for IR drop across PCB traces between the regulator output and point-of-load-critical for maintaining ±2% accuracy at high currents in ADAS modules.
LP875651RNFRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 26-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 3.36V
- Current - Output:
- 8A, 8A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 26-VQFN-HR (4.5x4)
LP875651RNFRQ1 FAQ
1.How can I place an order for LP875651RNFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP875651RNFRQ1 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 LP875651RNFRQ1 reliable?
The price and inventory of LP875651RNFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP875651RNFRQ1 is usually 5 days.
3.What payment methods are accepted for LP875651RNFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP875651RNFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP875651RNFRQ1?
LP875651RNFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP875651RNFRQ1 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 LP875651RNFRQ1?
For technical support, including LP875651RNFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP875651RNFRQ1 requirements.
6.How does Aetrix verify that LP875651RNFRQ1 is sourced from the original manufacturer or authorized distributors?
All LP875651RNFRQ1 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 LP875651RNFRQ1 meets industry standards.
7.What is the process for return or replacement of LP875651RNFRQ1?
All LP875651RNFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP875651RNFRQ1, 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 LP875651RNFRQ1 part is unused and in its original packaging.
Return procedure for LP875651RNFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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