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Texas Instruments LP875241SRNFRQ1
- Part No.:
- LP875241SRNFRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 26-PowerVFQFN
- Datasheet:
-
LP875241SRNFRQ1.pdf
- Description:
- IC REG BUCK PROG QUAD 26VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LP875241SRNFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive buck converter IC with four independent 1-phase DC/DC regulator cores, 2.8 V to 5.5 V input range, 0.6 V to 3.36 V programmable output voltage per rail, and up to 4.0 A per phase (10 A total). It delivers high efficiency across load ranges via automatic PWM/PFM mode switching and supports I²C interface up to 3.4 MHz for configuration and monitoring in infotainment and ADAS power systems.
For engineers reviewing the LP875241SRNFRQ1 datasheet, LP875241SRNFRQ1 pinout, LP875241SRNFRQ1 application, or LP875241SRNFRQ1 equivalent, key selection considerations include its four 1-phase configuration flexibility, integrated current sensing without external resistors, remote differential voltage sensing for point-of-load accuracy, and automotive-grade thermal warning/shutdown protection at 125°C ambient.
Technical Context
The LP875241SRNFRQ1 implements four fully independent synchronous buck regulators, each with dedicated VIN_Bx, SW_Bx, FB_Bx, and PGND_Bx connections-enabling true 1-phase-per-rail operation without internal phase coupling. Its AUTO mode dynamically selects PWM or PFM based on load, while phase adding/shedding is disabled (fixed 1-phase per rail), preserving rail isolation and simplifying layout for multi-rail SoC power domains.
Control is executed via a robust I²C interface supporting Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) modes, with programmable interrupt masking, PGOOD assertion thresholds, and GPIO-configurable EN1/EN2/EN3 pins that support both enable sequencing and dual-voltage level selection per rail. The device integrates high-side (29–65 mΩ) and low-side (17–35 mΩ) FETs per phase and supports external clock synchronization via CLKIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8 V to 5.5 V - supports wide automotive battery and LDO-preconditioned supply rails. |
| Output Voltage Range | 0.6 V to 3.36 V per rail - covers core, I/O, and interface voltages for modern processors and sensors. |
| Max Output Current | 4.0 A per phase (10 A total) - enables full utilization of all four rails simultaneously at rated load. |
| Switching Frequency | 1.8 MHz to 2.2 MHz (typ. 2 MHz) - allows compact 0.47 µH inductors and reduces EMI fundamental frequency. |
| I²C Speed Support | Up to 3.4 MHz - enables fast register writes during dynamic voltage scaling and real-time telemetry reads. |
| Thermal Rating | Ambient –40°C to +125°C (Grade 1), junction max 140°C - qualified for under-hood and display cluster environments. |
| Protection Features | OVP, UVLO, overtemperature warning (115–147°C), shutdown (140–160°C), short-circuit, and overload - ensures robust operation in safety-critical systems. |
Pinout & Package
The LP875241SRNFRQ1 is housed in a 26-pin VQFN-HR package (4.50 mm × 4.00 mm) with exposed thermal pad, optimized for automotive thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW_B0–SW_B3 | Buck switch node (x4) | Connects to external inductor; requires low-inductance layout to minimize switching loss and EMI. |
| FB_B0–FB_B3 | Output voltage feedback (x4) | Remote sense inputs enabling differential measurement to compensate PCB IR drop at point-of-load. |
| VIN_B0–VIN_B3 | Independent input supply (x4) | Not internally connected - must be externally tied together and locally bypassed for stable multi-rail operation. |
| EN1/EN2/EN3 | Configurable enable/GPIO (x3) | Supports rail sequencing, dual-voltage selection, or control of external devices like load switches or reset lines. |
| SDA/SCL | I²C bidirectional data/clock | Interface for full register access, telemetry readback, fault logging, and dynamic reconfiguration. |
| PGOOD | Power-good status output | Open-drain signal with programmable debounce (4 µs to 13 ms) for reliable system power sequencing. |
| nINT | Interrupt request output | Active-low, maskable interrupt for faults (OVP, thermal, PGOOD fail) or status events (rail ready). |
Key Features
| Feature | Design Value |
|---|---|
| Four independent 1-phase buck regulators | Enables isolated, individually configured power rails for heterogeneous SoCs without cross-regulator coupling. |
| Integrated current sensing | Eliminates need for external current-sense resistors - reduces BOM cost, board area, and thermal error sources. |
| Remote differential voltage sensing | Compensates for PCB trace resistance between regulator output and load, improving output voltage accuracy at point-of-load. |
| Programmable soft-start slew rate | Configurable output voltage ramp (0.47–10 mV/µs) minimizes inrush current and prevents overshoot during startup/voltage change. |
| Automated PWM/PFM transition | IPWM-PFM = 200 mA and IPFM-PWM = 600 mA thresholds maximize light-load efficiency without manual mode control. |
Applications
| Infotainment Processor Core Rail | Digital Camera Sensor I/O Rail |
|---|---|
Use Scenario: Powering ARM Cortex-A72/A76 CPU cores in automotive head units requiring dynamic voltage scaling and tight transient response. IC Role / Device Role / Timing Role: Four independent 1-phase buck regulators deliver isolated, sequenced, and independently adjustable voltages to CPU, GPU, memory, and I/O domains. Use Value: Achieves ±2% DC accuracy and ±40 mV transient deviation (0.1–8 A step) with 0.47 µH inductors, enabling reliable DVFS down to 0.6 V. | Use Scenario: Supplying dual-voltage I/O (1.8 V/3.3 V) and analog bias (2.8 V) to CMOS image sensors in surround-view or driver-monitoring cameras. IC Role / Device Role / Timing Role: Configures EN1/EN2 as GPIOs to toggle between two pre-programmed output voltages per rail, matching sensor mode requirements. Use Value: Eliminates external level shifters and voltage translators by delivering precise, software-selectable rail voltages directly from one IC. |
| Radar SoC Analog Front-End | ADAS Domain Controller Auxiliary Rails |
Use Scenario: Providing ultra-low-noise, tightly regulated analog supply (1.2 V, 1.8 V) to RF transceivers and ADCs in 77 GHz radar modules. IC Role / Device Role / Timing Role: Uses remote differential sensing on FB_Bx pins to maintain <±20 mV DC accuracy despite 50 mΩ PCB trace resistance to sensor die. Use Value: Reduces output ripple to 3–4 mVp-p in PWM mode, meeting stringent analog supply noise requirements without additional LDO post-regulation. | Use Scenario: Generating auxiliary voltages (1.0 V, 1.8 V, 3.3 V, 5.0 V) for PCIe switches, CAN transceivers, and Ethernet PHYs in centralized ADAS domain controllers. IC Role / Device Role / Timing Role: Leverages four independent rails with programmable PGOOD delay (4 µs–13 ms) to implement precise power-up sequencing across subsystems. Use Value: Ensures deterministic boot order and avoids bus contention or latch-up by aligning rail enable timing with processor reset and firmware initialization. |
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 |
|---|---|---|---|
| LP87525SRNFRQ1 | Two 2-phase outputs instead of four 1-phase; higher per-rail current (5 A/rail), shared inductor sets, no independent FB per phase. | Better suited for dual-high-current rails (e.g., CPU + GPU), less flexible for >2 isolated domains. | Select when system requires only two high-current rails and benefits from interleaved ripple reduction. |
| TPS65917B1ZWSR | Single-chip PMIC with 4 buck + 5 LDO + fuel gauge; fixed 1.8/3.3 V bucks, no remote sensing, lower max current (3 A/buck). | Targeted at entry-level infotainment with integrated power management, not high-performance radar or camera SoCs. | Select when BOM consolidation and integrated LDOs outweigh need for programmable voltage, remote sensing, and 4.0 A/rail capability. |
Compared with LP87525SRNFRQ1 and TPS65917B1ZWSR, the LP875241SRNFRQ1 uniquely provides four fully independent, remotely sensed 1-phase rails with 4.0 A capacity and 0.6 V–3.36 V programmability-making it optimal for complex, multi-domain automotive SoCs requiring rail isolation, precision regulation, and flexible sequencing.
Availability
LP875241SRNFRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS radar, and digital camera power applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LP875241SRNFRQ1 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 automotive qualification expertise and broad power management portfolio.
The LP8752x-Q1 product line was designed specifically for high-reliability automotive power management, targeting infotainment, digital cluster, radar, and camera systems requiring multi-rail, high-efficiency, and ASIL-ready DC/DC conversion.
FAQ
What is the maximum output current per rail for the LP875241SRNFRQ1?
The LP875241SRNFRQ1 supports up to 4.0 A per rail when configured in its default four 1-phase mode, with total device output capability of 10 A. This rating applies at VIN ≥ 3 V; at 2.8 V ≤ VIN < 3 V, the per-rail limit drops to 3.0 A. Each rail operates independently, and current limits are enforced per-phase via programmable forward current thresholds (1.5–5.0 A range).
Does the LP875241SRNFRQ1 support remote voltage sensing for improved accuracy?
Yes, the LP875241SRNFRQ1 supports remote differential voltage sensing on all four FB_Bx pins. Each feedback input can be configured to measure the voltage difference between the output and a remote ground point, compensating for IR drop across PCB traces. This feature maintains ±2% DC output accuracy even with up to 50 mΩ trace resistance between regulator and load.
Can the LP875241SRNFRQ1 operate with an external clock source?
Yes, the LP875241SRNFRQ1 accepts an external clock via the CLKIN pin, supporting nominal frequencies from 1 MHz to 24 MHz with ±30% tolerance. When enabled, the internal PLL synchronizes switching to the external clock, reducing EMI peak emissions and enabling deterministic timing alignment with system clocks in radar or camera applications.
How does the LP875241SRNFRQ1 handle power sequencing across its four rails?
The LP875241SRNFRQ1 supports programmable start-up and shutdown sequences synchronized to EN1/EN2/EN3 enable signals. Each rail's soft-start slew rate (0.47–10 mV/µs) and PGOOD assertion delay (4 µs–13 ms) are configurable via I²C registers, enabling precise inter-rail timing control without external timers or discrete logic.
Is the LP875241SRNFRQ1 qualified for automotive safety-critical applications?
Yes, the LP875241SRNFRQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), with HBM ESD Level 2 (±2 kV) and CDM Level C4B (±750 V on corner pins). It includes overtemperature warning (configurable 115–147°C), thermal shutdown (140–160°C), OVP, UVLO, and short-circuit protection-meeting functional safety requirements for ASIL-B capable systems when used per TI's safety manual.
LP875241SRNFRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LP8752x-Q1
- Package/Case:
- 26-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- 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:
- 4A, 4A, 4A, 4A
- 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)
LP875241SRNFRQ1 FAQ
1.How can I place an order for LP875241SRNFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP875241SRNFRQ1 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 LP875241SRNFRQ1 reliable?
The price and inventory of LP875241SRNFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP875241SRNFRQ1 is usually 5 days.
3.What payment methods are accepted for LP875241SRNFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP875241SRNFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP875241SRNFRQ1?
LP875241SRNFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP875241SRNFRQ1 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 LP875241SRNFRQ1?
For technical support, including LP875241SRNFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP875241SRNFRQ1 requirements.
6.How does Aetrix verify that LP875241SRNFRQ1 is sourced from the original manufacturer or authorized distributors?
All LP875241SRNFRQ1 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 LP875241SRNFRQ1 meets industry standards.
7.What is the process for return or replacement of LP875241SRNFRQ1?
All LP875241SRNFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP875241SRNFRQ1, 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 LP875241SRNFRQ1 part is unused and in its original packaging.
Return procedure for LP875241SRNFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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