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Texas Instruments LP875761ARNFRQ1
- Part No.:
- LP875761ARNFRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 26-PowerVFQFN
- Datasheet:
-
LP875761ARNFRQ1.pdf
- Description:
- IC REG BUCK 1V 16A 26VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LP875761ARNFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive four-phase synchronous buck converter delivering 16 A total output (4 A per phase) at 1.0 V with 3 MHz switching frequency, integrated high- and low-side FETs, and differential remote voltage sensing - designed for processor core power in infotainment, cluster, radar, and camera modules.
For engineers reviewing the LP875761ARNFRQ1 datasheet, LP875761ARNFRQ1 pinout, LP875761ARNFRQ1 application, or LP875761ARNFRQ1 equivalent, key selection criteria include its forced-PWM 4-phase architecture, I²C programmability up to 3.4 MHz, ±10% current balancing, 3.23–4.4 mV/µs slew-rate control, and thermal warning/shutdown thresholds at 125°C/150°C.
Technical Context
The LP875761ARNFRQ1 implements a master-slave 4-phase interleaved architecture where BUCK0 controls timing across all phases, enabling 90° phase-shifted PWM operation that quadruples effective ripple frequency to 12 MHz and reduces input/output current ripple. It uses current-mode control with PI compensation, synchronous rectification, and average inductor current sensing per phase without external sense resistors.
Its digital control layer supports programmable startup/shutdown sequencing synchronized to EN1–EN3 (configurable as GPIOs), maskable interrupt generation via nINT, and PGOOD assertion with 7–13 ms deglitch delay. The device accepts external clock inputs from 1–24 MHz and supports spread-spectrum modulation to suppress EMI peaks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.0 V ±10 mV DC accuracy over line/load/temp, including reference, regulation, and process variation. |
| Max Output Current | 16 A total (4 A per phase), limited by ILIM FWD programmable range (1.5–5 A/phase) and thermal shutdown at 150°C junction. |
| Switching Frequency | 3 MHz ±10% (2.7–3.3 MHz) in forced-PWM mode; supports external clock sync from 1–24 MHz with 1-MHz step resolution. |
| Input Voltage Range | 2.8 V to 5.5 V on VIN_Bx pins; requires local bypassing as VIN_Bx pins are not internally connected. |
| Current Sensing | Integrated average load-current measurement per phase (20 mA LSB, <10% error, 4 µs update time), no external sense resistor needed. |
| Thermal Protection | Configurable die temperature warning at 115–147°C (two levels) and hard shutdown at 140–160°C with 20°C hysteresis. |
| I²C Interface Speed | Supports Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) modes with full timing compliance. |
Pinout & Package
VQFN-HR (26-pin) package, 4.50 mm × 4.00 mm body size, with exposed thermal pad (AGND-connected). Pin count and layout optimized for multiphase layout symmetry and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW_B0–SW_B3 | Buck switch node (x4) | High-frequency switching nodes connecting internal HS/LS FETs to external inductors; require low-inductance routing. |
| VIN_B0–VIN_B3 | Phase input supply (x4) | Independent power inputs per phase; must be externally tied together and locally bypassed to PGND_B01/PGND_B23. |
| FB_B0–FB_B3 | Differential feedback (x4) | Positive feedback inputs; FB_B1/FB_B3 also serve as negative feedback for adjacent phases to enable remote POL sensing. |
| EN1/EN2/EN3 | Programmable enable/GPIO (x3) | Multi-function pins supporting regulator enable, dual-voltage selection, or configurable GPIO (push-pull/open-drain). |
| SDA/SCL/nINT/PGOOD | I²C interface & status outputs | Open-drain nINT and PGOOD support pull-up to VANA; SDA/SCL tolerate 1.65–3.6 V logic levels with full-speed timing compliance. |
| CLKIN/NRST/VANA | External clock, reset, analog supply | CLKIN accepts 1–24 MHz external clock; NRST is active-low reset with internal 650–1150 kΩ pulldown; VANA powers analog/digital blocks and must tie to VIN_Bx node. |
Key Features
| Feature | Design Value |
|---|---|
| 4-Phase Interleaved Architecture | Reduces output ripple amplitude by ~75% vs single-phase and improves transient response (±18 mV load step at 4–12 A, 1 µs edge). |
| Differential Remote Voltage Sensing | Compensates IR drop between regulator output and point-of-load using FB_Bx pairs, maintaining ±10 mV regulation accuracy at POL. |
| Programmable Slew-Rate Control | 3.23–4.4 mV/µs fixed slew rate limits inrush current and output overshoot during startup (soft-start time: 200 µs to 0.35 V). |
| Integrated Current Limit & Monitoring | Per-phase forward current limit (1.5–5 A, ±8% accuracy ≥3 A) and real-time load-current readback (20.47 A full-scale, 20 mA LSB). |
| Automotive-Grade Protection Suite | Includes OVP/UVLO on VANA (5.6–6.1 V / 2.51–2.75 V), output short-circuit/overload detection, and thermal warning + shutdown with hysteresis. |
Applications
| Automotive Infotainment Power | Instrument Cluster SoC Supply |
|---|---|
Use Scenario: Powers application processors (e.g., TI Jacinto 7, NXP i.MX 8) in head-unit systems requiring stable 1-V core rails under dynamic CPU/GPU load changes. IC Role / Device Role / Timing Role: Primary 4-phase core voltage regulator with I²C-configurable sequencing, PGOOD monitoring, and thermal management. Use Value: Delivers 16 A with <±10 mV DC accuracy and ±18 mV transient deviation, enabling reliable operation of multi-core SoCs in wide ambient (-40°C to +125°C). |
Use Scenario: Supplies display controller and MCU cores in digital instrument clusters where EMI-sensitive analog gauges and CAN interfaces coexist. IC Role / Device Role / Timing Role: Low-noise, spread-spectrum-capable buck converter with 12 MHz effective ripple frequency minimizing conducted EMI into analog subsystems. Use Value: Phase interleaving and optional spread spectrum reduce peak EMI by >10 dB, easing CISPR-25 Class 5 compliance without added filtering. |
| Radar Processor Core Rail | ADAS Camera Image Sensor Supply |
Use Scenario: Provides clean, tightly regulated 1-V supply to millimeter-wave radar SoCs (e.g., TI AWR2944) operating in engine bay environments. IC Role / Device Role / Timing Role: Automotive-grade power manager with remote sensing, thermal warning at 125°C, and robust UVLO/OVP protection. Use Value: Maintains regulation accuracy despite PCB trace IR drop and survives 150°C junction shutdown, ensuring fail-safe radar operation during thermal stress. |
Use Scenario: Powers high-speed image signal processors (ISPs) and stacked DRAM in surround-view camera modules with strict noise and transient requirements. IC Role / Device Role / Timing Role: Fast-transient, low-ripple 4-phase regulator with programmable startup delay and GPIO-controlled reset sequencing for sensor/ISP synchronization. Use Value: 200 µs soft-start and 4.4 mV/µs slew rate prevent ISP brownout during power-on; GPIOs coordinate sensor initialization and lens actuator enable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65917B1RSLR | Single-chip PMIC with 3 buck converters (max 3 A each), no 4-phase interleaving; lower max current (9 A total), fixed 1.0-V output only on one rail. | Targeted at entry-level infotainment with lower SoC power; lacks remote sensing and programmable slew rate. | Select when system power demand ≤9 A and board space constraints favor integrated PMIC over dedicated 4-phase solution. |
| LM63645QRNXTQ1 | Single-phase 4.5-A buck with external FETs; requires 4x ICs + controllers for 16-A equivalent; no integrated current sensing or I²C interface. | Suitable for modular designs where thermal spreading across multiple packages is preferred; higher BOM count and layout complexity. | Select only if discrete FET control, independent phase tuning, or failure-isolation requirements outweigh integration benefits of LP875761ARNFRQ1. |
Compared with TPS65917B1RSLR and LM63645QRNXTQ1, the LP875761ARNFRQ1 delivers higher current density (16 A in one 4.5×4.0-mm package), superior transient performance via interleaving, and embedded diagnostics - making it optimal for high-performance automotive SoCs where space, EMI, and accuracy are critical.
Availability
LP875761ARNFRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS radar, and digital cluster applications requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LP875761ARNFRQ1 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 high-reliability IC design.
The LP875761ARNFRQ1 belongs to TI's LP87xx-Q1 automotive power management IC family, engineered specifically for low-voltage, high-current processor core rails in safety-critical ADAS and infotainment systems.
FAQ
What is the output voltage accuracy of the LP875761ARNFRQ1 under full operating conditions?
The LP875761ARNFRQ1 guarantees DC output voltage accuracy of 0.99 V to 1.01 V (±10 mV) across –40°C to +140°C junction temperature, 2.8–5.5 V input, and full 16-A load - including effects of voltage reference, line/load regulation, process variation, and temperature drift. This specification is validated in forced-PWM 4-phase mode with 3-MHz switching.
Does the LP875761ARNFRQ1 support external clock synchronization, and what frequency range is accepted?
Yes, the LP875761ARNFRQ1 supports external clock synchronization via the CLKIN pin, accepting nominal frequencies from 1 MHz to 24 MHz in 1-MHz steps. Clock detection includes 20-µs debounce and 1.8-µs missing-clock detection; valid clock-to-output switching occurs within 600 µs. This enables EMI reduction through deterministic frequency alignment with system clocks.
How does the LP875761ARNFRQ1 implement remote voltage sensing, and which pins are involved?
The LP875761ARNFRQ1 implements true differential remote sensing using FB_B0–FB_B3 pins: FB_B0/FB_B2 are positive inputs for BUCK0/BUCK2, while FB_B1/FB_B3 double as negative inputs for BUCK0/BUCK2 respectively. This allows Kelvin-style connection to the point-of-load, compensating for PCB trace IR drop and maintaining ±10-mV regulation accuracy at the SoC power pins.
What protection features are integrated into the LP875761ARNFRQ1, and how are they configured?
The LP875761ARNFRQ1 integrates overvoltage protection (OVP) and undervoltage lockout (UVLO) on VANA (5.6–6.1 V / 2.51–2.75 V), per-phase overcurrent limiting (1.5–5 A programmable), thermal warning (115–147°C) and shutdown (140–160°C), output short-circuit detection, and PGOOD monitoring with user-selectable deglitch delays (4 µs to 13 ms). All protections are hardware-based with register-configurable thresholds.
Can the EN1, EN2, and EN3 pins of the LP875761ARNFRQ1 be used as general-purpose I/Os, and what configurations are supported?
Yes, EN1, EN2, and EN3 on the LP875761ARNFRQ1 are fully configurable as GPIOs with programmable direction (input/output), drive type (push-pull or open-drain), and pull-up/down settings. They retain their native enable functionality but can alternatively control external regulators, load switches, or processor reset signals - all synchronized to the device's internal power sequencing engine.
LP875761ARNFRQ1 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- -
- Current - Output:
- 16A
- Frequency - Switching:
- 3MHz
- 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)
LP875761ARNFRQ1 FAQ
1.How can I place an order for LP875761ARNFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP875761ARNFRQ1 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 LP875761ARNFRQ1 reliable?
The price and inventory of LP875761ARNFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP875761ARNFRQ1 is usually 5 days.
3.What payment methods are accepted for LP875761ARNFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP875761ARNFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP875761ARNFRQ1?
LP875761ARNFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP875761ARNFRQ1 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 LP875761ARNFRQ1?
For technical support, including LP875761ARNFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP875761ARNFRQ1 requirements.
6.How does Aetrix verify that LP875761ARNFRQ1 is sourced from the original manufacturer or authorized distributors?
All LP875761ARNFRQ1 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 LP875761ARNFRQ1 meets industry standards.
7.What is the process for return or replacement of LP875761ARNFRQ1?
All LP875761ARNFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP875761ARNFRQ1, 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 LP875761ARNFRQ1 part is unused and in its original packaging.
Return procedure for LP875761ARNFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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