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Texas Instruments LP87521ERNFTQ1
- Part No.:
- LP87521ERNFTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 26-PowerVFQFN
- Datasheet:
-
LP87521ERNFTQ1.pdf
- Description:
- IC REG BUCK ADJ 10A 26VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:672
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Product details
Overview
LP87521ERNFTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive buck converter IC with four integrated high-side/low-side FETs, configured exclusively as a single 4-phase 10-A output rail (VOUT = 0.6–3.36 V), operating from 2.8–5.5 V input and switching at 2 MHz. It delivers high efficiency across load range via automatic PWM/PFM mode transition and phase shedding, and supports remote differential sensing for point-of-load accuracy in infotainment and ADAS power rails.
For engineers reviewing the LP87521ERNFTQ1 datasheet, LP87521ERNFTQ1 pinout, LP87521ERNFTQ1 application, or LP87521ERNFTQ1 equivalent, key selection criteria include its fixed 4-phase topology, I²C-programmable voltage/current limits, integrated current measurement (±10% accuracy), thermal warning/shutdown thresholds (125°C warn / 150°C shutdown), and automotive-grade ESD robustness (HBM ±2 kV, CDM ±750 V on corner pins).
Technical Context
The LP87521ERNFTQ1 implements a tightly coupled 4-phase synchronous buck architecture with interleaved switching to reduce input/output ripple and improve transient response. Its internal PLL synchronizes phase timing, while spread-spectrum modulation minimizes EMI peaks without compromising regulation accuracy.
Control is executed via a 3.4-MHz-capable I²C interface supporting standard/fast/fast+/high-speed modes, with programmable PGOOD thresholds, interrupt masking, startup/shutdown sequencing (including GPIO-controlled external regulators), and slew-rate-limited voltage transitions to suppress inrush current and overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8 V to 5.5 V - supports direct connection to automotive battery rail with cold-crank margin. |
| Output Voltage Range | 0.6 V to 3.36 V in 5–20 mV steps - enables precise core voltage setting for SoCs and FPGAs. |
| Max Output Current | 10 A continuous (4-phase) - delivers high-current POL for radar processors or display controllers. |
| Switching Frequency | 2 MHz ±10% - allows compact 0.47-µH inductors and reduces audible noise in cabin environments. |
| I²C Interface Speed | Up to 3.4 MHz (high-speed mode) - enables fast dynamic voltage scaling during processor load changes. |
| Thermal Protection | Warning at 125°C (configurable), shutdown at 150°C - ensures safe operation under sustained high ambient conditions. |
| Current Sensing | Integrated, no external sense resistor required - measures load current up to 20.47 A with 20-mA LSB resolution. |
Pinout & Package
LP87521ERNFTQ1 is housed in a 4.5 mm × 4.0 mm, 26-pin VQFN-HR package with exposed thermal pad (RNF). The package supports high-power dissipation (RθJA = 34.6°C/W) and requires PCB-level thermal vias to AGND for optimal junction temperature control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW_B0–SW_B3 | Buck switch node (x4) | High-frequency AC nodes connecting to external inductors; require low-inductance layout and local ceramic decoupling. |
| FB_B0–FB_B3 | Output voltage feedback (x4) | Differential sense inputs enabling remote sensing to compensate IR drop between regulator and load. |
| VIN_B0–VIN_B3 | Per-phase input power (x4) | Must be externally tied together and locally bypassed - not internally connected inside IC. |
| PGND_B01 / PGND_B23 | Power ground (2 nets) | Separate ground returns for BUCK0/BUCK1 and BUCK2/BUCK3 to minimize cross-talk in multiphase operation. |
| EN1–EN3 | Configurable enable/GPIO (x3) | Supports hardware sequencing of multiple rails or control of external load switches and reset signals. |
| SDA / SCL | I²C bidirectional data/clock | Support 100 kHz–3.4 MHz operation; require pull-up resistors to VIO (1.65–3.6 V). |
| nINT / PGOOD | Open-drain status outputs | Programmable PGOOD window (±20–64 mV); nINT provides masked interrupt for fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Automated phase management | Phase adding/shedding thresholds (1 A → 2 A → 3 A) optimize efficiency across 0–10 A load range without firmware intervention. |
| Spread-spectrum clocking | Reduces peak EMI by >10 dB in 100–1000 MHz band - critical for CISPR 25 Class 5 compliance in vehicle cabins. |
| Remote differential sensing | Compensates for up to 50 mΩ IR drop between regulator and SoC VDD pin, maintaining ±0.5% output accuracy at point-of-load. |
| Programmable slew rate | Fixed slew rates (0.47–10 mV/µs) prevent overshoot during startup/voltage change - configurable per rail via register. |
| Integrated current monitor | Measures real-time load current with 20-mA resolution and <10% error - eliminates need for external sense resistor and amplifier. |
Applications
| Infotainment System Power | Digital Cluster Display Supply |
|---|---|
|
Use Scenario: Powers application processor, GPU, and DDR memory in head-unit systems requiring dynamic voltage scaling and low-noise operation. IC Role / Device Role / Timing Role: Primary 4-phase POL regulator delivering 1.1 V @ 8 A with <3% transient deviation under 8-A step load. Use Value: Enables fast DVFS response (<200 µs soft-start) and maintains stable core voltage during video decode bursts without external compensation. |
Use Scenario: Supplies LCD driver IC and MCU in digital instrument clusters where EMI must meet strict automotive radiated emission limits. IC Role / Device Role / Timing Role: High-efficiency 4-phase buck generating 3.3 V @ 3 A with spread-spectrum modulation active. Use Value: Reduces conducted EMI by >15 dB at 2 MHz fundamental, eliminating need for additional LC filters in space-constrained cluster PCBs. |
| Radar Processor Core Rail | ADAS Camera ISP Power |
|
Use Scenario: Provides clean, tightly regulated 0.85 V core supply to 77-GHz radar SoC with stringent ripple and transient requirements. IC Role / Device Role / Timing Role: 4-phase configuration with remote sensing compensates for 30 mΩ board trace resistance to maintain ±15 mV accuracy at SoC pin. Use Value: Achieves <3 mVp-p ripple in PWM mode and ±40 mV transient deviation under 1-µs 6-A load step - meets ASIL-B functional safety margin. |
Use Scenario: Powers image signal processor and high-speed SerDes in surround-view camera modules operating in extended temperature range. IC Role / Device Role / Timing Role: Automotive-qualified buck with thermal warning (125°C) and shutdown (150°C) for under-hood mounting near lens housing. Use Value: Maintains regulation over –40°C to +125°C ambient, with <10 µA shutdown current preserving battery life during vehicle sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP87522ERNFTQ1 | Configured as one 3-phase + one 1-phase output (not 4-phase only); identical pinout and package. | Suitable when system requires dual independent rails (e.g., 1.0 V core + 1.8 V I/O) instead of single high-current rail. | Select LP87522ERNFTQ1 only if split-rail topology is needed; LP87521ERNFTQ1 is mandatory for unified 10-A POL. |
| TPS65917B1RSLR | 7-channel PMIC with 3 buck converters (max 3 A each), no 4-phase capability; uses different I²C register map and GPIO assignment. | Targeted at lower-power infotainment SoCs (e.g., Jacinto 6/7) requiring mixed analog/digital power, not high-current radar processors. | Choose TPS65917B1RSLR for cost-sensitive, lower-current (<6 A total) applications with integrated LDOs and RTC; not a functional replacement for 10-A 4-phase demand. |
Compared with LP87522ERNFTQ1 and TPS65917B1RSLR, LP87521ERNFTQ1 uniquely delivers a dedicated 4-phase 10-A rail with integrated current sensing and remote differential feedback - essential for high-performance automotive processors where single-rail current capacity and point-of-load accuracy are non-negotiable.
Availability
LP87521ERNFTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, digital cluster, and radar power applications requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LP87521ERNFTQ1 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 solutions, with decades of automotive qualification expertise.
The LP8752x-Q1 product line was designed specifically for next-generation automotive ADAS and infotainment platforms, addressing the need for high-current, low-noise, thermally robust, and I²C-configurable power delivery in space- and EMI-constrained environments.
FAQ
What is the maximum output current capability of the LP87521ERNFTQ1?
The LP87521ERNFTQ1 delivers up to 10 A continuous output current in its fixed 4-phase configuration, verified at VIN ≥ 3 V. At lower input voltages (2.8 V ≤ VIN < 3 V), the maximum output current is derated to 7.2 A due to thermal and FET conduction constraints. This rating applies only to the single 4-phase rail - the device does not support split-phase or independent outputs.
Does the LP87521ERNFTQ1 support external clock synchronization?
Yes, the LP87521ERNFTQ1 accepts an external clock input on the CLKIN pin, supporting frequencies from 1 MHz to 24 MHz with ±30% tolerance. When enabled, the internal PLL locks to the external clock, allowing precise switching frequency alignment across multiple devices to minimize beat frequencies and simplify EMI filtering in multi-rail systems.
How does the LP87521ERNFTQ1 implement current measurement without external sense resistors?
The LP87521ERNFTQ1 integrates MOSFET RDS(on)-based current sensing for each phase, combining high-side and low-side FET conduction measurements. It reports digitized current values via I²C register (0x2A–0x2B) with 20-mA LSB resolution and <10% accuracy above 1 A - eliminating external sense resistors, associated power loss, and PCB area.
What protection features are built into the LP87521ERNFTQ1?
The LP87521ERNFTQ1 includes overtemperature warning (configurable 115–147°C), thermal shutdown (140–160°C), output short-circuit and overload protection, overvoltage (±64 mV PGOOD window) and undervoltage monitoring, input UVLO (2.5–2.75 V), and VANA overvoltage lockout (5.45–6.1 V). All protections trigger autonomous shutdown or flagging without host intervention.
Can the LP87521ERNFTQ1 be used in non-automotive applications?
While the LP87521ERNFTQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient) and optimized for automotive use, it may be deployed in industrial or medical applications requiring high-reliability, high-current DC/DC conversion. However, its I²C register set, fault reporting, and thermal thresholds are tuned for automotive duty cycles - full validation in non-automotive contexts remains the designer's responsibility.
LP87521ERNFTQ1 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:
- 1
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 3.36V
- Current - Output:
- 10A
- 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)
LP87521ERNFTQ1 FAQ
1.How can I place an order for LP87521ERNFTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP87521ERNFTQ1 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 LP87521ERNFTQ1 reliable?
The price and inventory of LP87521ERNFTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP87521ERNFTQ1 is usually 5 days.
3.What payment methods are accepted for LP87521ERNFTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP87521ERNFTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP87521ERNFTQ1?
LP87521ERNFTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP87521ERNFTQ1 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 LP87521ERNFTQ1?
For technical support, including LP87521ERNFTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP87521ERNFTQ1 requirements.
6.How does Aetrix verify that LP87521ERNFTQ1 is sourced from the original manufacturer or authorized distributors?
All LP87521ERNFTQ1 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 LP87521ERNFTQ1 meets industry standards.
7.What is the process for return or replacement of LP87521ERNFTQ1?
All LP87521ERNFTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP87521ERNFTQ1, 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 LP87521ERNFTQ1 part is unused and in its original packaging.
Return procedure for LP87521ERNFTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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