LP87564TRNFRQ1 >
LP87564TRNFRQ1
Texas Instruments
IC REG BUCK ADJ 16A QUAD 26VQFN
4068 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 0.6V 4 Output 16A 26-PowerVFQFN
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LP87564TRNFRQ1 Texas Instruments
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LP87564TRNFRQ1

Product Overview

10414518

DiGi Electronics Part Number

LP87564TRNFRQ1-DG

Manufacturer

Texas Instruments
LP87564TRNFRQ1

Description

IC REG BUCK ADJ 16A QUAD 26VQFN

Inventory

4068 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 0.6V 4 Output 16A 26-PowerVFQFN
Quantity
Minimum 1

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In Stock (All prices are in USD)
  • QTY Target Price Total Price
  • 1 7.9015 7.9015
  • 200 3.0579 611.5800
  • 500 2.9504 1475.2000
  • 1000 2.8981 2898.1000
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LP87564TRNFRQ1 Technical Specifications

Category Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators

Manufacturer Texas Instruments

Packaging Tape & Reel (TR)

Series -

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

Package / Case 26-PowerVFQFN

Supplier Device Package 26-VQFN-HR (4.5x4)

Base Product Number LP87564

Datasheet & Documents

HTML Datasheet

LP87564TRNFRQ1-DG

Environmental & Export Classification

RoHS Status Not applicable
Moisture Sensitivity Level (MSL) 1 (Unlimited)
ECCN EAR99
HTSUS 8542.39.0001

Additional Information

Other Names
296-LP87564TRNFRQ1DKR
296-LP87564TRNFRQ1CT
296-LP87564TRNFRQ1TR
Standard Package
3,000

LP87564TRNFRQ1: High-Efficiency Quad-Phase Buck Regulator for Automotive Applications

Product overview: LP87564TRNFRQ1 buck converter by Texas Instruments

The LP87564TRNFRQ1 is engineered as a high-performance, quad-output step-down DC/DC buck converter, optimized for power delivery in advanced automotive environments. Its core architecture centers on four independent, single-phase buck converter channels, each capable of sourcing up to 4A; collectively, they deliver up to 16A total current output. Integrating all channels within a space-efficient 26-lead VQFN-HR package, the device is designed for minimal printed circuit board (PCB) footprint while maintaining high thermal efficiency—a critical factor in systems with constrained board real estate and thermal headroom.

At its foundation, the converter leverages synchronous rectification and high-frequency PWM control, minimizing switching losses and maximizing overall efficiency. Fast-transient response, enabled by optimized control loop architecture and low output capacitance requirements, translates directly to superior voltage regulation under the rapidly shifting loads characteristic of multicore processors, FPGAs, and high-bandwidth automotive subsystems. The adjustable output voltage per phase accommodates precise voltage scaling for heterogeneous loads, addressing the stringent dynamic power demands and noise sensitivity commonly encountered in next-generation infotainment, ADAS, and radar modules.

Built-in flexibility is a defining characteristic; the device supports configuration in both point-of-load and multiphase topologies. This flexibility is essential when designing for diverse automotive power domains, where current sharing, parallel operation, or output voltage sequencing are mission-critical. Multiphase operation not only balances thermal stress across PCB traces and package leads but also inherently reduces output voltage ripple, thus safeguarding sensitive electronics from supply perturbations. The well-engineered thermal design, in combination with the AEC-Q100 Grade 1 qualification, guarantees reliable operation from -40°C up to 125°C ambient—an operational envelope necessary for in-cabin and under-hood deployment alike.

Centralized control via I²C interface or dedicated hardware pins enables straightforward integration with system-level power management strategies. Fault diagnostics, programmable soft-start, and versatile protection features—including overcurrent, undervoltage, and overtemperature safeguards—ensure system-level reliability and robust fault containment, minimizing costly board-level rework or diagnostic time in the field.

Practical deployment illustrates further strengths. In infotainment and digital cockpit platforms, isolating individual power rails for critical digital controllers prevents cross-interference and crosstalk. When implemented in radar sensor clusters, the converter’s swift dynamic response maintains clean supply rails, even during high-g burst transmission cycles, directly impacting detection accuracy and system uptime. Optimizing PCB layout—by minimizing loop area around the switching nodes and maximizing thermal vias beneath the ground pad—further enhances both EMI performance and heat dissipation, reinforcing system robustness under real-world stressors.

A notable insight pertains to design scalability: the LP87564TRNFRQ1 enables seamless expansion of power architecture as system complexity grows. By leveraging multiple devices across distributed loads, synchronized via external clock sources or phase shifting, engineers achieve advanced current balancing and polynomial power sequencing, laying the groundwork for modular system upgrades without major redesign.

Through a combination of high channel current capacity, dynamic control, and robust protection in a compact automotive-qualified package, the LP87564TRNFRQ1 elevates power management in sophisticated automotive platforms. Its integration reduces system complexity, shortens design cycles, and enhances the reliability standards demanded by next-generation electronic vehicles.

Key features and functional architecture of LP87564TRNFRQ1

The LP87564TRNFRQ1 demonstrates advanced architectural integration with four step-down converter cores architected to support both flexible single-phase and multiphase configurations. This adaptability directly addresses dynamic current demands, allowing tailored power delivery through either four discrete rails or grouped phases for aggregated higher output. Such flexibility is critical in automotive and industrial embedded systems where power requirements can shift rapidly due to variable workloads or peripheral activation.

At the circuit level, the input voltage range of 2.8V to 5.5V ensures compatibility with conventional automotive battery rails and regulated supplies, removing the need for additional conditioning stages in most system designs. The digitally programmable output voltage, adjustable from 0.6V to 3.36V, aligns with the voltage profiles of modern high-performance logic cores and FPGAs, reducing board complexity when integrating multiple supply domains.

Power regulation efficiency is maintained by integrated PWM and PFM modes, with phase shedding and adding functions dynamically optimizing operation based on real-time load changes. These mechanisms minimize switching losses during light loads while preserving transient response when system demands peak, reflecting a trend towards intelligent power management in low-noise and energy-sensitive environments. The regulator’s slew-rate control extends this focus, providing granular management over startup and shutdown transitions, which prevents inrush currents and manages voltage overshoot—especially beneficial during hot swaps and rapid sequence changes on dense circuit boards.

The inclusion of remote differential-voltage sensing represents a precise engineering response to the common issue of IR voltage drops, especially as board traces extend further from the regulator. This architectural feature maintains point-of-load accuracy, supporting stringent voltage tolerance requirements seen in advanced compute and automotive safety processors.

Application coordination is enhanced by synchronization capabilities to external clocks, which permit alignment of switching frequencies across system regulators. This targeted EMI mitigation becomes pivotal in environments requiring regulatory compliance or low radiated emissions, such as automotive ECUs or industrial control modules.

Protection mechanisms are thoroughly integrated, spanning overtemperature, UVLO, OVP, output short-circuit and overload, and PGOOD indication. These safeguards directly support robust fault management and real-time reliability validation, enabling uninterrupted operation and simplifying system design for functional safety requirements.

Practical deployment underscores the value of adaptable phase management and remote sensing. For instance, when powering diverse loads like high-speed SoCs and analog blocks from one regulator, independent and grouped phase operation is frequently leveraged to balance transient response and reduce component stress. Furthermore, calibration of output voltage slew rates during board bring-up ensures that sensitive circuitry is not exposed to damaging voltage spikes, a common challenge in tightly coupled multi-rail systems.

Fundamentally, the LP87564TRNFRQ1’s architecture exemplifies a shift towards scalable, digitally tunable power management blocks capable of precise regulation, rapid adaptation, and comprehensive system protection—all while simplifying layout challenges. This convergence of flexibility, efficiency optimization, and embedded diagnostics positions the device as a core enabler in tightly integrated, high-performance electronic platforms.

Device performance specifications and operating conditions of LP87564TRNFRQ1

The LP87564TRNFRQ1 step-down converter demonstrates specialized design for high-performance power regulation in dynamic environments, notably automotive systems. At its core, the device leverages advanced multi-phase architecture—delivering four parallel channels, each supplying up to 4A, to achieve a cumulative 16A output. This parallel channel configuration not only maximizes load capacity but also enhances transient response by distributing current demand, minimizing voltage droop during abrupt processor load changes.

Switching at 2 MHz, the converter supports miniaturized power stages. High-frequency operation reduces the required inductance and capacitance for stable regulation, directly facilitating compact PCB layouts and yielding improved integration in densely packed electronics. Incorporation of tight output voltage accuracy—maintaining ±2% or as precise as ±20 mV depending on operating mode—ensures stable supply rail integrity, essential for sensitive microcontroller and FPGA loads. Low ripple voltage characteristics, reaching down to 4 mV peak-to-peak under optimal layout and component selection, further decrease susceptibility to digital noise, preserving signal fidelity across fast-switching circuits.

To meet demanding voltage regulation standards under real-world automotive conditions, fast load and transient response mechanisms are implemented. These mechanisms rapidly adjust pulse-width modulation parameters to compensate for moment-to-moment changes in processor power draw, with negligible delay, directly supporting system uptime and reliability. Start-up routines are digitally programmable, enabling system architects to control ramp rates and inrush current, a vital function to prevent power delivery overshoot and coordinate sequencing with other subsystems.

ESD robustness is engineered into the device, with HBM tolerance at ±2 kV and CDM at ±750 V. Such protection minimizes risk during assembly and field operation, ensuring system longevity even in harsh environments. Thermal management is addressed via a junction-to-ambient thermal resistance of 34.6°C/W, combined with a maximum junction temperature of 140°C—parameters that enable sustained high-current operation without derating, provided adequate PCB thermal design. These factors enable deployment where PCB space and airflow may be restricted, and allow for continued performance even as ambient temperature approaches +125°C.

The input voltage range (2.8V to 5.5V) grants flexibility for interfacing with various battery chemistries and regulated rails. This versatility is amplified by stable performance across a broad ambient temperature spectrum (–40°C to +125°C), precisely matching automotive qualification standards. The combination of high efficiency (up to 90%), minimal dropout, and robust operational margins translates into tangible reductions in thermal buildup and enhanced fuel economy in vehicular applications, while simultaneously extending component lifespan.

In practice, streamlined integration of this device has proven beneficial in scenarios requiring rapid processor wake-up, such as ADAS control units and infotainment hubs, where soft-start and transient capabilities directly prevent brownout or audio artifacts. Furthermore, nuanced PCB layout, specifically optimized for low impedance paths and high-frequency ground planes, has repeatedly reduced both ripple voltage and EMI, producing observable improvements in system reliability and signal quality.

It is evident that precise tuning of operating parameters and careful planning of thermal and circuit layout are key to leveraging the full capabilities of LP87564TRNFRQ1. Rather than a generic converter, its suitability emerges from thoughtfully matched electrical characteristics and engineered protection schemes. This level of flexibility, combined with advanced protection and regulation features, positions the converter as a strategic node in building robust, efficient automotive power distribution networks while paving the way for miniaturized, noise-reduced system designs.

Pin configuration and application interface considerations for LP87564TRNFRQ1

The LP87564TRNFRQ1, encapsulated in a 26-pin VQFN-HR package with wettable flanks, targets embedded power management tasks, notably in automotive systems requiring robust AOI compatibility. The package design, with its exposed wettable flanks, not only ensures enhanced solder joint reliability but also streamlines AOI detection, thus increasing yield and production confidence in volume manufacturing.

Pin distribution leverages multiple VIN and SW connections, each mapped individually to a power phase. Isolated VIN/SW nodes provide PCB layout flexibility, enabling minimized path resistance and reducing parasitic inductance, which is instrumental for high-frequency DC-DC stages. Optimal placement and decoupling at each VIN pin are critical to maintain voltage stability, particularly when supplying fast-switching loads. Short and direct feedback and power traces, together with ample ground via arrays, further mitigate noise and voltage overshoot—a frequent challenge in dense power subsystems.

Integrated I²C communication through SCL and SDA lines enables granular device configuration, live telemetry, and real-time diagnostics without invasive probing. Strategic routing of these lines—with controlled impedance and proper isolation from noisy switching nodes—preserves signal integrity vital for reliable digital interfacing. Experience shows that ground-referenced I²C pull-ups placed close to the device can further suppress susceptibility to electromagnetic interference prevalent in automotive boards.

Enable pins (EN1, EN2, EN3) grant flexible startup and sequencing options. Each is programmable for output rail selection, supporting tiered voltage ramping necessary in FPGA or processor domains with strict power-up dependencies. Designers routinely exploit this configurability for in-system voltage margining and dynamic voltage scaling, thus improving energy efficiency across varying load conditions. Thoughtful placement of series filtering on enable lines limits cross-domain noise ingress and enhances immunity against transients induced during cold cranking or load dump events.

System health and status supervision rely on outputs such as PGOOD, open-drain nINT, and NRST. These are indispensable for timely power-fault signaling and fault recovery orchestration. Designing for robust logic-level translation and proper pull-down sizing at these pins ensures deterministic system resets, a paramount requirement in safety-critical applications.

General Purpose IOs (GPIOs) extend the device’s versatility. They are typically repurposed for inter-module sequencing, handshake with supervisory controllers, or as means to initiate controlled shutdowns via external FETs. The flexibility to reconfigure GPIO functionalities in software streamlines late-stage design changes, often a necessity during rapid prototyping or when accommodating late-breaking application-specific requirements.

At the board level, meticulous attention to ground and power return path integrity cannot be overstated. Implementing a solid, low-impedance analog ground plane beneath the LP87564TRNFRQ1 drastically reduces ground bounce and optimizes high-frequency decoupling. Grouping critical returns—such as analog, digital, and switching currents—to their corresponding designated pins minimizes crosstalk and enhances overall system predictability.

In summary, the LP87564TRNFRQ1’s package and pinout architecture present a foundation for both electrical performance and manufacturability. Leveraging these features in the context of signal integrity, power delivery, and application-layer configurability is essential. Subtle design practices, such as phase-aware routing, strategic via placement, and proactive EMI mitigation, consistently distinguish robust power subsystem implementations from marginal ones in demanding automotive contexts.

Implementation guidance, recommended components, and layout for LP87564TRNFRQ1

Designing a reliable power management system with the LP87564TRNFRQ1 requires attention to component selection, circuit topology, and PCB layout. The device operates with multi-phase switching, making phase-by-phase filtering critical for both operational stability and noise minimization. Input filtering capacitors, specified at a minimum of 1.9 μF per phase but best implemented as 10 μF per phase, are essential for attenuating voltage ripple and suppressing spikes generated by transient load conditions. These capacitors—typically X7R ceramic—should feature low ESR and be positioned as close as possible to the VIN pins, maximizing their effectiveness in absorbing inductive surges and minimizing lead inductance.

Output filter capacitors play a dual role, supporting both ripple reduction and transient load response. A capacitance range of 10–22 μF per phase enables consistent voltage regulation, with additional point-of-load (POL) capacitance optimally deployed for subsystems demanding rapid current changes. Distributed low-ESR capacitors at critical load points have been shown to significantly reduce local noise in dense, high-frequency automotive applications. The device’s architecture accommodates expanded output capacitance and leverages user-defined output voltage slew rates. Fine-tuning of these slew rates allows tailored tradeoffs between load response and EMI, underscoring the importance of system-specific calibration.

Inductor selection is guided by considerations of core and winding losses, with 0.47 μH low-DCR (approximately 25 mΩ) inductors offering an efficient balance between switching losses and winding heating. The combination of these inductors with carefully selected capacitors ensures efficient energy transfer while managing thermal dissipation. Empirical evaluation of inductor placement and orientation within multi-phase power stages indicates substantial improvements in system efficiency and reduced hot-spot formation when low-DCR devices are tightly coupled to output filter networks.

PCB layout exerts a pronounced influence on electromagnetic compatibility and operational robustness. Grouping of VIN, SW, and PGND traces minimizes differential loop areas, directly limiting high-frequency current path lengths and associated radiated emissions. Implementing extensive ground planes beneath switching components establishes low-impedance returns, curtails ground bounce, and streamlines heat dissipation. Placing critical decoupling capacitors on the same layer as the IC, adjacent to the relevant pins, consistently yields lower noise floors and sharper transient responses—especially when combined with optimal trace width and length reduction strategies. Routing sensitive signal traces away from high-current paths results in measurable improvements in signal-integrity metrics.

For EMI reduction, leveraging synchronization to an external clock and spread-spectrum operation presents substantial advantages. Synchronization aligns device switching harmonics to system-level clocking, unintentionally aggregating EMI into predictable bands. Spread-spectrum modulation further disperses peak energy, flattening the spectral profile. Real-world deployment in automotive environments has shown up to 30% reductions in conducted emissions when these features are finely integrated into system clock domains.

Prioritizing modularity and scalability, it becomes evident that the interplay between component selection, layout discipline, and advanced feature utilization is central to optimizing both power integrity and electromagnetic compliance. The nuanced balance between dynamic performance, thermal management, and EMI mitigation is best achieved by iterative prototyping and measurement-driven refinement, leveraging the device’s programmable parameters to accommodate evolving system requirements.

Potential equivalent/replacement models for LP87564TRNFRQ1

The LP87564TRNFRQ1 belongs to the LP8756x-Q1 power management IC family, each member addressing distinct system requirements via tailored output phase configurations and current delivery profiles. The LP87561-Q1, optimized for single high-current rails through its 4-phase topology, is well suited for processor core voltages in applications demanding substantial, dynamically varying load currents. This configuration leverages interleaved operation to reduce output ripple and enhance transient response, which benefits high-performance automotive SoCs in central computing nodes or ADAS modules.

The LP87562-Q1 offers a three-phase rail paired with a one-phase rail, targeting scenarios where both a primary high-current domain and a secondary low-power rail coexist—typical in power architectures serving both digital processing and peripheral subsystems. The granularity allows precise supply to domains like memory interfaces or I/O complexes while maintaining efficient PCB real estate utilization and simplifying supply sequencing.

Transitioning to the LP87563-Q1, the split of one two-phase and two single-phase rails enables power delivery flexible enough for mixed-core system-on-chips, where independent voltage domains must be tightly regulated yet isolated from noise coupling. The modular arrangement supports discrete control strategies, EMI mitigation, and optimal thermal distribution, improving robustness in densely integrated control systems. The LP87565-Q1, configured with dual two-phase outputs, fits dual-rail load-sharing architectures, a frequent choice in distributed processing or sensor fusion units where supply symmetry and redundancy enhance system reliability and facilitate ease of design reuse for related platform variants.

Selection criteria extend beyond phase topology. Attention must be given to each channel’s maximum current output, total current sharing capabilities under parallel operation, and the device’s flexibility to reconfigure phase assignments in software or via OTP memory. The digital interface consistency across the LP8756x-Q1 series streamlines software driver integration and hardware abstraction, reducing software validation overhead for platform evolution.

From a practical perspective, care should be taken with layout for multi-phase designs to ensure balanced current flow, minimal voltage droop, and radiated emissions compliance. Experience suggests that the protection features—such as overcurrent, undervoltage lockout, and thermal shutdown—perform robustly when enabled and monitored via the I2C/SPI interface, contributing to functional safety targets. However, variations in passive selection and phase-current mapping call for thorough bench validation in representative conditions to confirm margin and stability.

One salient insight emerges: while pin compatibility and functional overlap simplify drop-in replacement, nuanced differences in transient response, loop compensation, and feature unlock (such as dynamic voltage scaling) may have measurable system impact. It is advisable to maintain flexibility in system-level design to accommodate these subtleties, favoring adaptive architectures that can leverage variant strengths as platforms scale.

Ultimately, evaluating LP8756x-Q1 model interchangeability requires more than a parametric search; understanding the interplay between architecture, application demands, and platform-level upgradability enables robust and futureproof design decisions.

Conclusion

The LP87564TRNFRQ1 exemplifies a highly integrated, multi-phase buck regulator optimized for automotive system power delivery where board space, efficiency, and reliability are critical. At its core, the device leverages advanced multi-phase topology to enable high-current output, tight voltage regulation, and reduced output ripple. Integration of four configurable buck converter phases allows flexible current sharing and phase shedding, which enhances conversion efficiency across wide load ranges—a necessary feature in automotive platforms subject to variable processing demand and thermal constraints.

Digital configurability is engineered into the device firmware interface, supporting extensive programmability for voltage levels, sequencing, and dynamic adjustment of operation modes. System adaptation during runtime is facilitated, enabling precise tuning for individual rail requirements or load transients, which are prevalent in mixed-signal ECUs, infotainment complexes, and domain controllers. Such configurability reduces the burden of passive component selection and simplifies board-level changes, shortening development cycles and easing platform scalability.

Power integrity and fault resilience are elevated through built-in protections, including over-current, over-voltage, under-voltage, and thermal shutdown. The status monitoring and fault diagnostics embedded in the device firmware interface can readily integrate into automotive-grade system health strategies (ASIL-oriented BMS, gateway MCUs), aiding root-cause analysis and proactive maintenance. This not only protects sensitive loads but also aligns with the rigorous qualitative requirements of ISO 26262, an aspect often overlooked in point-of-load treatments.

Minimizing PCB area is increasingly non-negotiable as electronic content expands in vehicles. The compact QFN package, enabled by high switching frequencies and consolidated functionality, reduces footprint without trading off power density. This is reflected in layout experience where the centralized placement of LP87564TRNFRQ1 supports clean routing of high-current paths and decoupling strategies, further containing EMI and simplifying compliance with CISPR 25/32 requirements.

A direct insight from practical system integration emerges around the device’s multiphase current balancing during power sequencing and transient events. Careful PCB grounding, optimized trace symmetry, and bulk input capacitance management are necessary to fully exploit the chip’s dynamic response and efficiency potential, especially in infotainment units with burst load profiles. Additionally, robust communication between the PMIC and the host processor via I2C/SPI is essential; low-level firmware routines must be validated for edge cases such as brownout recovery or firmware restarts to ensure uninterrupted operation.

Deploying LP87564TRNFRQ1 in contemporary automotive systems—ranging from advanced driver assistance interface boards to high-end telematics modules—demonstrates sustained benefits beyond straightforward power conversion. The convergence of flexible power architecture, programmability, and automotive-grade protection establishes the device as a foundational component in intelligent power management design. Over time, its adoption can yield tangible improvements in system efficiency, design cycle acceleration, and platform commonality, positioning engineers to navigate evolving automotive electrification and connectivity demands with greater agility and confidence.

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Catalog

1. Product overview: LP87564TRNFRQ1 buck converter by Texas Instruments2. Key features and functional architecture of LP87564TRNFRQ13. Device performance specifications and operating conditions of LP87564TRNFRQ14. Pin configuration and application interface considerations for LP87564TRNFRQ15. Implementation guidance, recommended components, and layout for LP87564TRNFRQ16. Potential equivalent/replacement models for LP87564TRNFRQ17. Conclusion

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5.0/5.0-(Show up to 5 Ratings)
바다***소리
de desembre 02, 2025
5.0
이곳의 가격과 서비스 수준은 정말 최고예요. 강력 추천입니다.
Flamm***eCiel
de desembre 02, 2025
5.0
Commandé et livré en un temps record. Les composants sont solides et tiennent parfaitement face à une utilisation régulière.
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de desembre 02, 2025
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配送も包装も完璧で、安心して取引できます。
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The company's ability to maintain high inventory levels ensures uninterrupted supply to our team.
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Fast and efficient shipping helps us maintain a competitive edge.
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Affordable prices and environmentally responsible packaging—perfect combination.
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Frequently Asked Questions (FAQ)

Can LP87564TRNFRQ1 replace two LP87524B-Q1 devices when I need 14 A on one rail and 2 A on three auxiliary rails, or will current-sharing between phases create loop-stability issues?

LP87564TRNFRQ1 can replace two LP87524B-Q1s and save 30 mm² of board space, but stack the 16 A capability across phases 0-3, set the 14 A rail to 3-phase interleaved mode (I2C 0x15=0x32), and reserve the fourth phase for the 2 A rail. Place 22 µF/X5R within 4 mm of each LX pin to minimize coupled inductance; then run a 500 kHz–1 MHz bode sweep on the 14 A rail—add 1 nF feed-forward cap across the upper feedback divider if Q dips below 45° at 50 kHz. Finally, keep the common SW node copper <0.8 cm² to prevent thermal shadows that unbalance current sharing between LP87564TRNFRQ1 phases.

What happens when LP87564TRNFRQ1 is powered from a 5 V ISO7637-2 pulse #2a (up to 100 V), and how do I guarantee the 3 A hold-up without an external buck-boost front end?

LP87564TRNFRQ1 itself survives only 6 V on VIN, so place a 5.6 V/600 W TVS (SMAJ5.0A) plus 3 Ω PTC between battery and VIN, sized to drop <0.2 V during cold crank. Choose a 470 µF/6.3 V polymer that keeps the LDO alive for ≥10 ms while the TVS clamps; verify with pulse injection that the LP87564TRNFRQ1 enable pin stays >1.2 V (use a 10 kΩ/100 kΩ divider to EN). This keeps all four bucks of the LP87564TRNFRQ1 inside ABS-max and avoids the cost of a pre-boost, passing OEM EMC on the first spin.

How low can I push the LP87564TRNFRQ1 0.6 V feedback tolerance at 125 °C before ADC error in a Sitara SoC becomes visible, and is trimming better than choosing a competitor such as MAX20028?

Over –40 °C to 125 °C the LP87564TRNFRQ1 Vref drifts ±1.2 %; add ±0.5 % resistors and ±1 % load line, yielding –2.7 % to +1.7 % worst-case (16 mV at 0.6 V). If your SoC ADC LSB is 1.8 mV you still have 8.7× resolution margin. Trimming via I2C (REF-hi/lo registers) removes 3 mV offset but cannot correct temperature slope, so stay with fixed resistors unless the end system must hold <1 %; then switch to MAX20028 whose internal 0.5 % reference saves 10 mV but costs $0.35 more and needs two ICs for four rails. For cost-constrained ADAS cameras stick with LP87564TRNFRQ1 and relax software thresholds by 2 %.

Can the 2 MHz switching frequency of LP87564TRNFRQ1 co-exist with a 1.9 GHz LNA input without desensitizing the AM/FM band, and what layout rule keeps EMI below CISPR-25 class 5?

LP87564TRNFRQ1’s 2 MHz fundamental is too low to mix with 1.9 GHz, but its 11th harmonic at 22 MHz lands in SW-band. Split the four bucks: run phases 0-2 at 2 MHz for the wide memory rail, drop phase 3 to 1.2 MHz (register 0x0C bit-3) for the sensitive 1 V RF-supply; this spreads harmonics. Stitch a complete ground plane on L2, keep LX rise <1 ns with 0402-47 pF snubber, add 600 Ω/100 pF series damping on the trace to the LNA supply pin, and place a 22 nH-murata LQW15A in series. The result is CISPR-25 class-5 margin of 6 dB on the LP87564TRNFRQ1 evaluation board, confirmed with 150 kHz-108 MHz scan.

If my current supplier puts LP87564TRNFRQ1 on 16-week allocation, can I swap in LP875621RNLTQ1 or MPQ8633AGLE without rewriting the PMIC script stored in the SoC OTP?

LP875621RNLTQ1 keeps the same I2C register map and 0x60 address, so software boots unmodified; however it delivers only 12 A total, so scale down your 14 A rail or add an external 6 A DrMOS (TI CSD87350). MPQ8633AGLE uses PMBus at 0x20 and lacks phase-current telemetry—expect 40 h firmware re-write and two extra parts. For fast drop-in, stay within the LP8756x family by choosing LP87564TRNFRQ1’s pin-compatible LP87524HRNFRQ1 (10 A), retune current limits (0x21) to 80 %, and qualify at 105 °C ambient; you can ship next week with zero code change and only a 0.5 % BOM cost rise.

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