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Texas Instruments LP875640RNFRQ1
- Part No.:
- LP875640RNFRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 26-PowerVFQFN
- Datasheet:
-
LP875640RNFRQ1.pdf
- Description:
- IC REG BUCK ADJ 16A QUAD 26VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,361
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Product details
Overview
LP875640RNFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive buck converter IC configured for four independent 1-phase DC/DC outputs, each delivering up to 4 A (16 A total), with programmable output voltage (0.6–3.36 V), 2 MHz switching frequency, and I²C interface supporting up to 3.4 MHz. It powers infotainment SoCs and camera sensor rails in vehicles.
For engineers reviewing the LP875640RNFRQ1 datasheet, LP875640RNFRQ1 pinout, LP875640RNFRQ1 application, or LP875640RNFRQ1 equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade thermal and protection features, and real-world multiphase power sequencing use cases - all aligned to TI's SNVSB22 production data sheet.
Technical Context
The LP875640RNFRQ1 implements four fully independent synchronous buck regulators, each with dedicated VIN_Bx, SW_Bx, FB_Bx, and PGND_Bx connections, enabling isolated input filtering and point-of-load sensing per phase. Its AUTO mode dynamically transitions between PWM and PFM based on load, while phase shedding (e.g., 4→3 at 2.4 A) and adding (3→4 at 3 A) optimize efficiency across 0.1–16 A output range.
It supports remote differential voltage sensing per output, programmable slew rates (0.47–10 mV/µs), and integrated current measurement without external sense resistors. The device uses a 26-pin VQFN-HR (4.5 mm × 4.0 mm) package with dual ground planes (AGND and PGND_B01/PGND_B23) and separate analog (VANA) and digital power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Four independent 1-phase buck converters - enables discrete rail control for multi-voltage SoC subsystems (e.g., core, I/O, memory, PHY). |
| Max Output Current | 4 A per phase (16 A total) - supports high-current camera ISPs and radar MMICs without external parallelization. |
| Input Voltage Range | 2.8 V to 5.5 V - compatible with automotive 3.3 V and 5 V supply rails and battery transients down to 2.8 V. |
| Output Voltage Range | 0.6 V to 3.36 V in 5–20 mV steps - covers DDR3L, LPDDR4, ARM Cortex-A cores, and image sensor analog supplies. |
| Switching Frequency | 1.8–2.2 MHz (typ. 2 MHz) - allows compact 0.47 µH inductors and reduces EMI in crowded ADAS PCB layouts. |
| I²C Interface Speed | Up to 3.4 MHz (High-Speed mode) - enables fast dynamic voltage scaling (DVS) and real-time telemetry updates. |
| Thermal Rating | Ambient: –40°C to +125°C; Junction: up to +140°C - qualified for under-hood and dashboard-mounted infotainment modules. |
Pinout & Package
LP875640RNFRQ1 uses a 26-pin VQFN-HR package (4.50 mm × 4.00 mm, 0.35 mm pitch) with exposed thermal pad. Pin functions are validated per TI SNVSB22 Rev. March 2018.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB_B0–FB_B3 | Output voltage feedback (positive) | Per-phase remote sensing inputs - compensate IR drop to improve POL voltage accuracy ±0.4% at 1 V. |
| VIN_B0–VIN_B3 | Independent input power pins | Must be externally tied together and locally bypassed - prevents cross-regulator coupling during transient load steps. |
| SW_B0–SW_B3 | Buck switch node | Connects to external 0.47 µH inductor - high-side/low-side FET RDS(on) is 29–65 mΩ / 17–35 mΩ per phase. |
| EN1–EN3 | Configurable enable/GPIO | Three programmable digital I/Os - used for sequenced startup, external regulator control, or voltage-level selection. |
| SDA/SCL | I²C bidirectional data/clock | Supports 100 kHz–3.4 MHz - enables register access, fault logging, and real-time current monitoring (20 mA LSB). |
| PGOOD | Power-good status output | Open-drain signal with programmable debounce (4 µs–13 ms) - synchronizes processor boot with stable rail delivery. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), HBM ±2 kV, CDM ±500 V - certified for safety-critical cockpit electronics. |
| Per-phase current measurement | Integrated sensing (0–20.47 A range, <10% error, 20 mA resolution) - eliminates external sense resistors and layout area. |
| Programmable slew rate | 0.47–10 mV/µs (7 settings) - controls in-rush current and minimizes overshoot during voltage transitions. |
| Multiphase flexibility | Configurable as four 1-phase rails - supports heterogeneous SoC power domains requiring independent sequencing and monitoring. |
| Protection suite | OVP/UVP on VANA and each VOUT, overtemperature warning/shutdown (125°C/150°C), short-circuit and overload detection - ensures robust field operation. |
Applications
| ADAS Camera Module Power | Infotainment Application Processor |
|---|---|
|
Use Scenario: Dual-sensor front-facing camera system with ISP, MIPI CSI-2 interface, and low-light HDR processing. IC Role / Device Role / Timing Role: Four independent buck rails supply 1.1 V core, 1.8 V I/O, 3.3 V sensor bias, and 1.2 V MIPI PHY - each with individual enable, PGOOD, and current telemetry. Use Value: Eliminates need for four discrete PMICs; reduces BOM count by 60% and improves transient response via per-phase current limiting (1.5–5 A programmable). |
Use Scenario: Automotive head-unit running Android Automotive OS with quad-core ARM CPU, GPU, and display controller. IC Role / Device Role / Timing Role: Generates sequenced 0.85 V CPU, 1.1 V GPU, 1.8 V DDR I/O, and 3.3 V USB/PCIe rails using EN1–EN3 GPIOs and I²C-triggered soft-start. Use Value: Achieves <10 mV p-p ripple at 4 A/phase (PWM mode) and <2% DC accuracy - meets SoC voltage tolerance specs without external compensation. |
| Radar Signal Processor Rail | Digital Cluster Display Power |
|
Use Scenario: 77 GHz radar ECU with FPGA-based beamformer and ADC/DAC interfaces. IC Role / Device Role / Timing Role: Supplies 1.0 V FPGA core, 1.2 V transceiver, 2.5 V ADC reference, and 3.3 V CAN/LIN interface - each rail independently monitored for current and temperature. Use Value: Integrated current measurement enables real-time thermal derating; phase shedding maintains >85% efficiency at 0.5 A load per rail. |
Use Scenario: TFT-LCD instrument cluster with MCU, graphics accelerator, and touch controller. IC Role / Device Role / Timing Role: Delivers 1.2 V logic, 1.8 V memory, 3.3 V backlight driver, and 5 V USB-C PD negotiation - coordinated startup avoids brownout during cold crank. Use Value: Programmable PGOOD delay (4 µs–13 ms) aligns rail readiness with MCU reset timing; spread-spectrum mode reduces EMI near sensitive analog sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP875650RNFRQ1 | Two 2-phase outputs (8 A per rail); shares same pinout, I²C register map, and thermal specs. | Better suited for dual-high-current rails (e.g., CPU + GPU), not independent low-current rails. | Select when system requires two heavy loads instead of four light ones - no PCB change needed. |
| TPS65917B1ZWSRQ1 | Single-chip PMIC with 4 buck + 5 LDO + fuel gauge; larger 64-pin VQFN, higher quiescent current (12 µA vs 6.7 µA). | Integrates power, battery management, and audio; targets full-featured infotainment head units. | Choose when LDOs, charger, or fuel gauging are required - adds functionality but increases footprint and cost. |
Compared with LP875650RNFRQ1, LP875640RNFRQ1 offers finer-grained rail independence and lower standby current; versus TPS65917B1ZWSRQ1, it trades integration for smaller size, lower cost, and optimized efficiency in pure multi-buck applications.
Availability
LP875640RNFRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital cluster displays requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP875640RNFRQ1 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 decades of AEC-Q100 qualification expertise.
The LP8756x-Q1 product line was designed specifically for automotive SoC and sensor power delivery - emphasizing multiphase flexibility, functional safety support, and seamless integration into ASIL-B/C system architectures.
FAQ
What is the maximum output current per phase for LP875640RNFRQ1?
The LP875640RNFRQ1 supports up to 4 A per phase across all four buck regulators, with total output capability of 16 A. This rating assumes VIN ≥ 3 V; at 2.8 V ≤ VIN < 3 V, max per-phase current drops to 3 A. Each phase includes independent forward current limiting (1.5–5 A programmable) and negative current limiting (1.6–2.4 A), validated per TI SNVSB22 Section 7.5.
Does LP875640RNFRQ1 support remote voltage sensing?
Yes, LP875640RNFRQ1 supports remote differential voltage sensing on each FB_Bx pin - FB_B0 through FB_B3 serve as positive feedback inputs, and certain pins (e.g., FB_B1, FB_B3) can alternatively function as negative feedback for adjacent rails. This compensates for PCB IR drop and maintains ±0.4% output accuracy at the point-of-load, as specified in the electrical characteristics table.
What package type and dimensions does LP875640RNFRQ1 use?
LP875640RNFRQ1 uses the RNF package: a 26-pin VQFN-HR with 4.50 mm × 4.00 mm body size, 0.35 mm pin pitch, and exposed thermal pad. Thermal resistance values include RθJA = 34.6°C/W and RθJB = 4.7°C/W, enabling reliable operation at 140°C junction temperature in automotive under-hood environments.
Can LP875640RNFRQ1 operate with an external clock source?
Yes, LP875640RNFRQ1 accepts an external clock via the CLKIN pin, supporting nominal frequencies from 1 MHz to 24 MHz with ±30% tolerance. External clock synchronization reduces EMI and enables deterministic timing in synchronized multi-PMIC systems. When unused, CLKIN must be grounded - internal RC oscillator provides default 2 MHz operation.
How does LP875640RNFRQ1 handle power sequencing across its four outputs?
LP875640RNFRQ1 enables precise power sequencing using three configurable ENx pins (EN1–EN3) and I²C-controlled soft-start. Each buck rail's startup delay and slew rate are individually programmable; GPIOs can trigger external regulators or processor reset signals. Sequencing is synchronized to enable edges, ensuring correct ramp-up order (e.g., core before I/O) without external timing components.
LP875640RNFRQ1 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:
- 4
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 3.36V
- Current - Output:
- 16A
- 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)
LP875640RNFRQ1 FAQ
1.How can I place an order for LP875640RNFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP875640RNFRQ1 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 LP875640RNFRQ1 reliable?
The price and inventory of LP875640RNFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP875640RNFRQ1 is usually 5 days.
3.What payment methods are accepted for LP875640RNFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP875640RNFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP875640RNFRQ1?
LP875640RNFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP875640RNFRQ1 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 LP875640RNFRQ1?
For technical support, including LP875640RNFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP875640RNFRQ1 requirements.
6.How does Aetrix verify that LP875640RNFRQ1 is sourced from the original manufacturer or authorized distributors?
All LP875640RNFRQ1 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 LP875640RNFRQ1 meets industry standards.
7.What is the process for return or replacement of LP875640RNFRQ1?
All LP875640RNFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP875640RNFRQ1, 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 LP875640RNFRQ1 part is unused and in its original packaging.
Return procedure for LP875640RNFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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