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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LP87522ERNFTQ1

Name: LP87522ERNFTQ1
Brand: Texas Instruments
SKU: LP87522ERNFTQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LP87522ERNFTQ1

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 26-PowerVFQFN

Datasheet:: LP87522ERNFTQ1.pdf

Description:: IC REG BUCK ADJ 4A/9A DL 26VQFN

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Product details

Overview

LP87522ERNFTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive buck converter IC with four integrated MOSFETs, configured as one 3-phase and one 1-phase output delivering up to 9.0 A (VIN ≥3 V) and 4.0 A respectively. It operates from 2.8 V to 5.5 V input, supports 0.6 V–3.36 V programmable output voltage, and features 2 MHz switching frequency with spread-spectrum and phase interleaving for low EMI in infotainment and ADAS power rails.

For engineers reviewing the LP87522ERNFTQ1 datasheet, LP87522ERNFTQ1 pinout, LP87522ERNFTQ1 application, or LP87522ERNFTQ1 equivalent, this page delivers verified technical context, exact pin functions, confirmed multiphase configuration, real-world automotive use cases, and two validated alternative parts - all grounded in TI's SNVSB23 production data sheet.

Technical Context

The LP87522ERNFTQ1 implements a configurable quad-buck architecture where three phases (BUCK0–BUCK2) are grouped into a single 3-phase rail and BUCK3 operates independently as a 1-phase rail. Each phase integrates high-side (29–65 mΩ) and low-side (17–35 mΩ) FETs, enabling autonomous current balancing (<10% mismatch) and dynamic phase adding/shedding at defined load thresholds (e.g., 3 A add → 4-phase, 2.4 A shed ← 4-phase).

Control is executed via I²C interface (100 kHz–3.4 MHz), supporting programmable soft-start slew rates (0.47–10 mV/µs), PGOOD monitoring with ±40 mV threshold accuracy, and autonomous PWM↔PFM transition at 200 mA (PWM→PFM) and 600 mA (PFM→PWM). Remote differential sensing on FB_Bx pins compensates IR drop for precise point-of-load regulation.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.8 V to 5.5 V - supports direct connection to automotive battery (cold-crank tolerant down to 2.8 V)
Output Configuration	One 3-phase + one 1-phase rail - enables optimized power delivery for SoC core + I/O rails in radar or cluster systems
Max Output Current	9.0 A (3-phase, VIN ≥3 V) / 4.0 A (1-phase, VIN ≥3 V) - total 13 A combined, limited by thermal design and per-phase current limits
Switching Frequency	1.8–2.2 MHz (typ. 2 MHz) - allows compact 0.47 µH inductors and reduces EMI fundamental below 2.5 MHz
I²C Interface Speed	Up to 3.4 MHz (High-Speed mode) - enables fast register access for dynamic voltage scaling in processor power management
Thermal Protection	Die temperature warning at 115–135 °C (configurable), shutdown at 140–160 °C - ensures safe operation in under-hood environments
Efficiency Peak	≥90% at mid-load (e.g., 3–6 A, VOUT = 1.8 V, VIN = 3.7 V) - achieved via adaptive phase shedding and low RDS(ON) FETs

Pinout & Package

LP87522ERNFTQ1 uses a 26-pin VQFN-HR package (4.50 mm × 4.00 mm) with exposed thermal pad. Pin functions are electrically isolated per buck channel; VIN_Bx pins must be externally tied together and locally bypassed, while PGND_B01 and PGND_B23 provide separate power ground returns for phase groups.

Pin/Terminal	Circuit Role	Design Meaning
SW_B0–SW_B3	Buck switch node (x4)	Connects to external inductor; each drives one phase - SW_B0/B1/B2 form 3-phase leg, SW_B3 is standalone
FB_B0–FB_B3	Voltage feedback input (x4)	Remote sense inputs; FB_B1/FB_B3 double as negative feedback for adjacent rails to support differential sensing
VIN_B0–VIN_B3	Phase input supply (x4)	Independent power inputs - must be shorted externally and decoupled with ≥1.9 µF ceramic per pin
EN1/EN2/EN3	Configurable enable/GPIO (x3)	Programmable startup sequencing control; can trigger external regulators or processor reset signals
SDA/SCL	I²C bidirectional data/clock	Supports standard/fast/fast+/high-speed modes - enables real-time telemetry and dynamic reconfiguration
PGOOD	Power-good status output	Open-drain signal with programmable debounce (4 µs to 13 ms); asserts when all enabled rails meet ±2% regulation
nINT	Interrupt output	Active-low open-drain flag for fault events (OVP, UVLO, thermal warning, phase fault)
NRST	Hardware reset input	Asynchronous active-low reset with internal 650–1700 kΩ pulldown - ensures known state after cold start

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 front-end radar and digital cluster deployment
Multiphase flexibility	Fixed 3+1 phase mapping - eliminates need for external phase controllers while maintaining optimal current sharing across three phases
Load-current measurement	Integrated current sensing (20 mA LSB, <10% error >1 A) - removes external sense resistors and associated board area/power loss
Spread-spectrum & interleaving	Reduces peak EMI amplitude by >10 dB at fundamental frequency - meets CISPR-25 Class 5 requirements without added shielding
Programmable PGOOD	Adjustable overvoltage (39–64 mV) and undervoltage (–53 to –29 mV) thresholds - enables tight tolerance monitoring for safety-critical rails
Soft-start slew control	Configurable output ramp rate (0.47–10 mV/µs) - prevents in-rush current and overshoot during power-up of sensitive SoCs

Applications

Automotive Digital Cluster	Radar Signal Processor Power
Use Scenario: Powers application processor (e.g., TDA4VM) and GPU in digital instrument clusters with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Primary multi-rail PMIC delivering 1.2 V @ 6 A (3-phase) for CPU core and 3.3 V @ 2 A (1-phase) for I/O and display interface. Use Value: Phase interleaving reduces input ripple current by 60% vs. single-phase, lowering bulk capacitor stress and extending lifetime in high-temp dash environments.	Use Scenario: Supplies millimeter-wave radar SoC (e.g., AWR2944) requiring tightly regulated, low-noise 1.0 V and 1.8 V rails with fast transient response. IC Role / Device Role / Timing Role: Configured as 3-phase 1.0 V rail (for RF DSP cores) and 1-phase 1.8 V rail (for ADC and interface logic) with synchronized soft-start. Use Value: 1 µs load-step response (±40 mV) and remote sensing maintain <±1.5% output deviation during beam-forming bursts, ensuring ADC linearity.
ADAS Camera Module	Automotive Infotainment Head Unit
Use Scenario: Powers image signal processor (ISP) and high-speed MIPI interface in surround-view camera ECUs operating near engine compartments. IC Role / Device Role / Timing Role: 3-phase 1.1 V rail powers ISP core; 1-phase 2.8 V rail supplies MIPI PHY and lens actuator drivers. Use Value: Thermal warning at 125 °C triggers firmware throttling before shutdown, preserving video stream continuity during sustained 85 °C ambient operation.	Use Scenario: Manages power sequencing for multimedia SoC (e.g., i.MX8QXP), DDR memory, and audio codec in center-stack head units. IC Role / Device Role / Timing Role: Uses EN1/EN2/EN3 GPIOs to control external load switches and coordinate DDR VDD/VDDQ ramp timing with processor reset. Use Value: Programmable startup delays (200 µs soft-start + configurable GPIO timing) eliminate race conditions between SoC boot ROM and memory initialization.

Automotive Digital Cluster

Radar Signal Processor Power

Use Scenario: Powers application processor (e.g., TDA4VM) and GPU in digital instrument clusters with strict EMI and thermal constraints.

IC Role / Device Role / Timing Role: Primary multi-rail PMIC delivering 1.2 V @ 6 A (3-phase) for CPU core and 3.3 V @ 2 A (1-phase) for I/O and display interface.

Use Value: Phase interleaving reduces input ripple current by 60% vs. single-phase, lowering bulk capacitor stress and extending lifetime in high-temp dash environments.

Use Scenario: Supplies millimeter-wave radar SoC (e.g., AWR2944) requiring tightly regulated, low-noise 1.0 V and 1.8 V rails with fast transient response.

IC Role / Device Role / Timing Role: Configured as 3-phase 1.0 V rail (for RF DSP cores) and 1-phase 1.8 V rail (for ADC and interface logic) with synchronized soft-start.

Use Value: 1 µs load-step response (±40 mV) and remote sensing maintain <±1.5% output deviation during beam-forming bursts, ensuring ADC linearity.

ADAS Camera Module

Automotive Infotainment Head Unit

Use Scenario: Powers image signal processor (ISP) and high-speed MIPI interface in surround-view camera ECUs operating near engine compartments.

IC Role / Device Role / Timing Role: 3-phase 1.1 V rail powers ISP core; 1-phase 2.8 V rail supplies MIPI PHY and lens actuator drivers.

Use Value: Thermal warning at 125 °C triggers firmware throttling before shutdown, preserving video stream continuity during sustained 85 °C ambient operation.

Use Scenario: Manages power sequencing for multimedia SoC (e.g., i.MX8QXP), DDR memory, and audio codec in center-stack head units.

IC Role / Device Role / Timing Role: Uses EN1/EN2/EN3 GPIOs to control external load switches and coordinate DDR VDD/VDDQ ramp timing with processor reset.

Use Value: Programmable startup delays (200 µs soft-start + configurable GPIO timing) eliminate race conditions between SoC boot ROM and memory initialization.

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
LP87523ERNFTQ1	Configured as one 2-phase + two 1-phase outputs (vs. LP87522ERNFTQ1's 3+1) - different phase grouping and current distribution	Suitable for designs needing independent dual-core SoC rails (e.g., Cortex-A72 + Cortex-R5) plus auxiliary I/O rail	Select LP87523ERNFTQ1 when discrete 2-A rails are required instead of aggregated 9-A 3-phase rail
TPS65917B1ZWSR	Single-chip PMIC with 4 buck converters (max 3 A each), no multiphase capability, integrated LDOs and charger - different architecture and feature set	Targeted at lower-power infotainment (e.g., entry-level head units) without radar/cluster thermal or current demands	Choose TPS65917B1ZWSR only if system requires integrated battery charging and LDOs, and peak current ≤3 A/rail

Compared with LP87523ERNFTQ1 (2+1+1) and TPS65917B1ZWSR (four independent bucks), LP87522ERNFTQ1 uniquely delivers high-current 3-phase efficiency for compute-intensive automotive domains while retaining a dedicated 1-phase rail for flexible peripheral powering - making it optimal for radar and digital cluster where aggregate current and EMI control are critical.

Availability

LP87522ERNFTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS radar modules, and digital instrument cluster applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for LP87522ERNFTQ1 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 and embedded processing technologies, with deep expertise in automotive-grade power management ICs.

The LP8752x-Q1 product line was designed specifically for next-generation automotive processors - delivering high-efficiency, configurable multiphase buck conversion with integrated protection and diagnostics for radar, camera, cluster, and infotainment systems.

FAQ

What is the exact multiphase configuration supported by LP87522ERNFTQ1?

The LP87522ERNFTQ1 is factory-configured for one 3-phase output (using BUCK0–BUCK2) and one independent 1-phase output (BUCK3). This fixed 3+1 topology cannot be reconfigured to 4-phase or 2+2 - unlike the LP87521-Q1 or LP87525-Q1. The 3-phase rail supports up to 9.0 A (VIN ≥3 V), while the 1-phase rail supports up to 4.0 A under the same condition. This configuration is documented in TI's SNVSB23 device comparison table.

Does LP87522ERNFTQ1 support remote voltage sensing, and how is it implemented?

Yes, LP87522ERNFTQ1 supports remote differential voltage sensing via dedicated FB_Bx pins. For the 3-phase rail, FB_B0/FB_B1/FB_B2 connect to the respective phase outputs, while FB_B3 serves as the remote ground reference for the 3-phase group. For the 1-phase rail (BUCK3), FB_B3 is used as the positive feedback node. This arrangement compensates for PCB IR drop between the IC and point-of-load, improving DC regulation accuracy to ±2% across temperature and load - a key requirement for automotive SoC power rails.

What are the I²C timing limits and voltage level requirements for LP87522ERNFTQ1?

LP87522ERNFTQ1 supports I²C standard (100 kHz), fast (400 kHz), fast+ (1 MHz), and high-speed (3.4 MHz) modes. SCL/SDA require 1.65–1.95 V for 100 kHz–3.4 MHz operation or 3.1–3.6 V for 100 kHz–1 MHz. High-speed mode requires ≤100 pF bus capacitance and supports tLOW/tHIGH down to 160 ns. All timing parameters - including tSU;DAT (10 ns min), trDA (10–80 ns), and tfDA (10–80 ns) - are specified in Section 7.6 of the SNVSB23 datasheet and guaranteed across –40°C to +125°C.

How does LP87522ERNFTQ1 handle thermal protection, and what are the trip thresholds?

LP87522ERNFTQ1 provides two-tier thermal protection: die temperature warning (programmable at 115–135 °C) and thermal shutdown (140–160 °C), both with 20 °C hysteresis. Warning triggers the nINT pin and sets status bits for firmware response; shutdown forces all regulators off until temperature falls below hysteresis threshold. These thresholds are AEC-Q100 validated and measured at the die junction - not ambient - ensuring robust operation in under-hood environments where ambient reaches +105 °C.

Can LP87522ERNFTQ1 measure output current, and what is its accuracy?

Yes, LP87522ERNFTQ1 integrates per-phase current measurement with 20 mA LSB resolution and <10% accuracy for loads >1 A. Total current is reported as a 11-bit code (max 20.47 A). Measurement occurs in <45 µs (PFM mode) or 4 µs (PWM mode), with automatic mode switching during sampling. This eliminates external sense resistors and associated power loss - critical for high-efficiency automotive rails where every milliwatt counts. Accuracy is specified across –40°C to +140°C junction temperature.

LP87522ERNFTQ1 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:: 2

Voltage - Input (Min):: 2.8V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 3.36V

Current - Output:: 4A, 9A

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)

LP87522ERNFTQ1 FAQ

1.How can I place an order for LP87522ERNFTQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for LP87522ERNFTQ1 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 LP87522ERNFTQ1 reliable?

The price and inventory of LP87522ERNFTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP87522ERNFTQ1 is usually 5 days.

3.What payment methods are accepted for LP87522ERNFTQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP87522ERNFTQ1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LP87522ERNFTQ1?

LP87522ERNFTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LP87522ERNFTQ1 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 LP87522ERNFTQ1?

For technical support, including LP87522ERNFTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP87522ERNFTQ1 requirements.

6.How does Aetrix verify that LP87522ERNFTQ1 is sourced from the original manufacturer or authorized distributors?

All LP87522ERNFTQ1 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 LP87522ERNFTQ1 meets industry standards.

7.What is the process for return or replacement of LP87522ERNFTQ1?

All LP87522ERNFTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP87522ERNFTQ1, 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 LP87522ERNFTQ1 part is unused and in its original packaging.

Return procedure for LP87522ERNFTQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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