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Texas Instruments LP875640RNFTQ1
- Part No.:
- LP875640RNFTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 26-PowerVFQFN
- Datasheet:
-
LP875640RNFTQ1.pdf
- Description:
- IC REG BUCK ADJ 16A QUAD 26VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:167
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Product details
Overview
LP875640RNFTQ1 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 serves as a multi-rail power management solution for infotainment processors, ADAS camera modules, and digital clusters requiring precise, sequenced, and monitored voltage regulation.
For engineers reviewing the LP875640RNFTQ1 datasheet, LP875640RNFTQ1 pinout, LP875640RNFTQ1 application, or LP875640RNFTQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed multiphase configuration limits, real-world efficiency vs. load curves, and two rigorously cross-checked alternative parts for automotive power design continuity.
Technical Context
The LP875640RNFTQ1 implements four fully independent synchronous buck regulators, each with dedicated VIN_Bx, SW_Bx, FB_Bx, and PGND_Bx connections-enabling true 4×1-phase operation without internal phase coupling. Its AUTO mode dynamically transitions between PWM and PFM based on load, while phase add/shed thresholds (e.g., IADD = 1 A for 1→2-phase) are configurable per rail via I²C registers.
It supports remote differential sensing on all feedback paths, programmable slew rates (0.47–10 mV/µs), and integrated current measurement (20 mA LSB, <10% accuracy >1 A). Protection includes overtemperature warning (115–135°C), thermal shutdown (140–160°C), OVP/UVLO on VANA, and per-phase forward/negative current limiting (ILIM FWD: 1.5–5 A; ILIM NEG: 1.6–2.4 A).
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 transient tolerance |
| Output Voltage Range | 0.6 V to 3.36 V in 5–20 mV steps - enables precise core and I/O rail regulation for SoCs and sensors |
| Max Output Current | 4 A per phase (16 A total) - scalable across four independent rails with no shared current path |
| Switching Frequency | 1.8–2.2 MHz (typ. 2 MHz) - allows compact 0.47 µH inductors and reduces EMI fundamental frequency |
| I²C Interface Speed | Up to 3.4 MHz (High-Speed mode) - enables fast register writes for dynamic voltage scaling and sequencing |
| Thermal Rating | Ambient: –40°C to +125°C; Junction: –40°C to +140°C - qualified for under-hood and dashboard mounting |
| Protection Features | Per-phase OCP, OTP, OVP/UVLO, PGOOD monitoring, and interrupt masking - eliminates need for external supervisors |
Pinout & Package
The LP875640RNFTQ1 is housed in a 26-pin VQFN-HR (RNF) package measuring 4.5 mm × 4.0 mm with exposed thermal pad. Pin assignment follows TI's standardized layout for the LP8756x-Q1 family, with dedicated power, feedback, switch, and control terminals per buck channel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_B0–VIN_B3 | Input power supply pins per buck channel | Must be externally tied together and locally bypassed - not internally connected; enables flexible input routing |
| SW_B0–SW_B3 | Buck high-side/low-side switch node per channel | Connects directly to external inductor; requires low-ESR ceramic output capacitors (10–22 µF/phase) |
| FB_B0–FB_B3 | Output voltage feedback (positive) per channel | Supports remote sensing to compensate PCB IR drop; also serves as negative feedback for adjacent channels in dual-rail configs |
| EN1–EN3 (GPIO1–3) | Configurable enable/control inputs | Programmable as buck enable signals or dual-voltage select GPIOs; internal pulldown (500 kΩ) |
| SCL / SDA | I²C serial interface clock/data | Supports standard (100 kHz), fast (400 kHz), fast+ (1 MHz), and high-speed (3.4 MHz) modes with Schmitt-trigger inputs |
| PGOOD | Open-drain power-good status output | Asserts after soft-start and voltage validation; threshold ±8–20 mV around final VOUT; debounced (4 µs–13 ms) |
| nINT | Open-drain interrupt output | Signals fault conditions (OCP, OTP, UVLO); maskable per event via I²C register; active-low, requires external pullup |
Key Features
| Feature | Design Value |
|---|---|
| Four independent 1-phase buck regulators | Enables discrete rail control for heterogeneous SoCs - e.g., separate cores, memory, I/O, and peripherals - with no inter-channel coupling |
| Programmable output voltage slew rate | 0.47–10 mV/µs range prevents inrush current and overshoot during startup/voltage change; critical for sensitive processor cores |
| Integrated current measurement | 20 mA LSB resolution, <10% error above 1 A - eliminates external sense resistors and associated board area/power loss |
| Automated phase add/shed logic | Configurable thresholds (e.g., 1 A → 2-phase, 2.4 A → 4-phase) maximize efficiency across 0–100% load without firmware intervention |
| Remote differential voltage sensing | Compensates for PCB trace resistance between regulator output and point-of-load - improves DC accuracy to ±2% (≥1 V) or ±20 mV (<1 V) |
Applications
| Infotainment Processor Power | Digital Instrument Cluster |
|---|---|
Use Scenario: Powers ARM-based application processors (e.g., TI Jacinto, NXP i.MX8) in head units with multiple voltage domains (core, GPU, DDR, I/O). IC Role / Device Role / Timing Role: Four independent buck regulators deliver tightly regulated, sequenced 0.8 V (core), 1.1 V (GPU), 1.2 V (DDR), and 3.3 V (I/O) rails with synchronized startup. Use Value: Eliminates need for four discrete PMICs; reduces BOM count by 60% and PCB area by 35% versus discrete solutions. |
Use Scenario: Supplies display controller, microcontroller, backlight LED driver, and CAN transceiver in automotive digital dashboards. IC Role / Device Role / Timing Role: Configured as four 1-phase rails: 1.2 V (MCU core), 3.3 V (CAN/LIN interface), 5 V (backlight boost input), and 1.8 V (LVDS serializer). Use Value: Meets AEC-Q100 Grade 1 requirements and supports cold-crank (2.8 V) operation without brownout - ensuring cluster uptime during engine start. |
| Radar Sensor Module Power | ADAS Camera Module Power |
Use Scenario: Provides clean, low-noise power to 77 GHz radar transceivers (e.g., TI AWR2944) and DSPs in front-end radar ECU designs. IC Role / Device Role / Timing Role: Delivers 1.0 V @ 3 A (RF core), 1.2 V @ 2 A (DSP), 1.8 V @ 1.5 A (interface), and 3.3 V @ 1 A (ADC bias) with <3 mVpp ripple in PWM mode. Use Value: 2 MHz switching avoids interference with radar IF bands; spread-spectrum mode further suppresses EMI peaks near critical frequencies. |
Use Scenario: Powers image sensor (e.g., Sony IMX415), ISP, MIPI PHY, and auto-focus actuator in surround-view and front ADAS cameras. IC Role / Device Role / Timing Role: Generates 1.2 V (sensor analog), 1.8 V (sensor digital), 2.8 V (ISP core), and 3.3 V (MIPI termination) with independent soft-start delays to prevent simultaneous inrush. Use Value: Programmable slew rate (0.47–10 mV/µs) ensures <±3% transient response during frame-rate changes - preserving image integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP875650RNFTQ1 | Two 2-phase outputs (8 A per rail); shares same pinout and register map but different phase grouping logic | Better suited for dual-high-current rails (e.g., CPU + GPU) rather than four medium-current rails | Select when system requires two heavy loads (>6 A each) instead of four balanced loads (~4 A each) |
| TPS65917B1ZWSRQ1 | Integrated LDOs, RTC, battery charger, and 3 buck converters (max 3 A each); QFN-64 package; lower integration density | Targets full-featured infotainment SoM power with battery backup and always-on capability | Choose when LDOs, fuel gauging, or RTC are required - not a drop-in replacement due to pin count and feature mismatch |
Compared with LP875640RNFTQ1, LP875650RNFTQ1 offers higher per-rail current but less flexibility for distributed loads, while TPS65917B1ZWSRQ1 adds system-level functions at the cost of buck channel count and footprint - making LP875640RNFTQ1 optimal for pure multi-rail buck scalability in space-constrained ADAS modules.
Availability
LP875640RNFTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera, and digital cluster applications requiring stable component supply, AEC-Q100 compliance, and long-term production support.
Supply support for LP875640RNFTQ1 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-grade power management ICs, with decades of automotive qualification expertise.
The LP8756x-Q1 product line was designed specifically for next-generation automotive domain controllers and ADAS ECUs, delivering high-efficiency, configurable multi-phase buck regulation with integrated diagnostics and functional safety support.
FAQ
What is the exact configuration of the LP875640RNFTQ1?
The LP875640RNFTQ1 is factory-configured for four independent 1-phase buck converter outputs - distinct from other variants like LP875650RNFTQ1 (two 2-phase) or LP875620RNFTQ1 (one 3-phase + one 1-phase). This configuration is fixed in silicon and cannot be reprogrammed to multi-phase groupings.
Does the LP875640RNFTQ1 support remote voltage sensing?
Yes, the LP875640RNFTQ1 supports true remote differential sensing on all four FB_Bx pins. Each feedback path can be wired to the point-of-load to compensate for PCB trace resistance, improving output voltage accuracy to ±2% (≥1 V) or ±20 mV (<1 V) under load.
What protection features are integrated into the LP875640RNFTQ1?
The LP875640RNFTQ1 integrates per-phase overcurrent protection (forward/negative limits), overtemperature warning (115–135°C) and shutdown (140–160°C), VANA overvoltage (5.6–6.1 V) and undervoltage lockout (2.51–2.75 V), and programmable PGOOD monitoring with ±8–20 mV thresholds.
Can the LP875640RNFTQ1 operate from a 2.8-V input during cold-crank conditions?
Yes, the LP875640RNFTQ1 operates across 2.8 V to 5.5 V input. At 2.8 V input, maximum output current per phase is reduced to 3 A (12 A total), maintaining regulation and protection functionality - meeting automotive cold-crank requirements without external boost circuitry.
How does the LP875640RNFTQ1 handle power sequencing across its four rails?
The LP875640RNFTQ1 supports programmable startup/shutdown delays and sequences via I²C registers. Sequencing can include EN1–EN3 GPIOs to control external regulators or reset lines, enabling precise timing alignment (e.g., core before I/O) without external timing components.
LP875640RNFTQ1 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)
LP875640RNFTQ1 FAQ
1.How can I place an order for LP875640RNFTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP875640RNFTQ1 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 LP875640RNFTQ1 reliable?
The price and inventory of LP875640RNFTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP875640RNFTQ1 is usually 5 days.
3.What payment methods are accepted for LP875640RNFTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP875640RNFTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP875640RNFTQ1?
LP875640RNFTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP875640RNFTQ1 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 LP875640RNFTQ1?
For technical support, including LP875640RNFTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP875640RNFTQ1 requirements.
6.How does Aetrix verify that LP875640RNFTQ1 is sourced from the original manufacturer or authorized distributors?
All LP875640RNFTQ1 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 LP875640RNFTQ1 meets industry standards.
7.What is the process for return or replacement of LP875640RNFTQ1?
All LP875640RNFTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP875640RNFTQ1, 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 LP875640RNFTQ1 part is unused and in its original packaging.
Return procedure for LP875640RNFTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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