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Texas Instruments LP87561IRNFTQ1
- Part No.:
- LP87561IRNFTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 26-PowerVFQFN
- Datasheet:
-
LP87561IRNFTQ1.pdf
- Description:
- IC REG BUCK ADJ 16A QUAD 26VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,108
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Product details
Overview
LP87561IRNFTQ1 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 16-A output (4 A per phase), supporting 0.6 V to 3.36 V programmable output voltage, 2 MHz fixed switching frequency, and I²C-controlled slew-rate (0.47–10 mV/µs). It delivers power to advanced driver-assistance systems (ADAS) processors requiring tight transient response and multiphase current sharing.
For engineers reviewing the LP87561IRNFTQ1 datasheet, LP87561IRNFTQ1 pinout, LP87561IRNFTQ1 application, or LP87561IRNFTQ1 equivalent, key selection criteria include its 4-phase-only topology, remote differential sensing capability for point-of-load accuracy, programmable phase-add/shed thresholds (IADD/ISHED), and automotive-grade thermal warning/shutdown behavior at 125°C/150°C.
Technical Context
The LP87561IRNFTQ1 implements automatic PWM-to-PFM mode transition with phase shedding (1→2→3→4 phases) based on load current thresholds (0.7 A, 1.5 A, 2.4 A), enabling >90% efficiency across 1 mA–16 A output range. Its internal PLL supports external clock synchronization (1–24 MHz) and spread-spectrum operation to reduce EMI in sensitive radar and camera modules.
It integrates four independent buck regulators with configurable GPIOs (EN1/EN2/EN3), interrupt masking, PGOOD programmability, and real-time load-current measurement (20.47 A full-scale, ±10% accuracy) without external sense resistors-critical for closed-loop power sequencing in infotainment SoCs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Fixed 4-phase, single-output rail (no 3+1/2+2/1+1+1+1 options) |
| Max Output Current | 16 A total (4 A per phase), limited by junction temperature and input voltage ≥3 V |
| Input Voltage Range | 2.8 V to 5.5 V - supports direct connection to automotive battery rail with cold-crank tolerance |
| Output Voltage Range | 0.6 V to 3.36 V in 5–20 mV steps - covers core, I/O, and memory rails of modern ADAS processors |
| Switching Frequency | 2 MHz ±10% - enables compact 0.47 µH inductors and <8 mVp-p ripple in 1-phase mode |
| I²C Interface Speed | Up to 3.4 MHz High-Speed mode - allows rapid dynamic voltage scaling during processor DVFS transitions |
| Thermal Protection | Die temperature warning at 125°C (configurable), shutdown at 150°C with 20°C hysteresis |
Pinout & Package
VQFN-HR (26-pin) package, 4.50 mm × 4.00 mm body size, exposed thermal pad for PCB-level heat dissipation (RθJB = 4.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW_B0–SW_B3 | Buck switch node (x4) | Connects to external inductor; each drives one phase of the 4-phase output |
| FB_B0–FB_B3 | Output voltage feedback (x4) | Remote differential sensing inputs - FB_Bx and complementary ground sense enable IR-drop compensation |
| VIN_B0–VIN_B3 | Phase input supply (x4) | Independent power pins - must be externally tied together and locally bypassed per TI layout guidelines |
| PGND_B01 / PGND_B23 | Power ground (2 nets) | Separate ground returns for BUCK0/BUCK1 and BUCK2/BUCK3 to minimize coupling between phases |
| EN1/EN2/EN3 | Configurable GPIO/enable (x3) | Supports hardware sequencing of external regulators or processor reset signals during startup/shutdown |
| SDA/SCL/nINT/CLKIN | I²C interface + clock sync | Enable register access, interrupt reporting, and external clock synchronization to reduce system EMI |
Key Features
| Feature | Design Value |
|---|---|
| 4-Phase Fixed Architecture | Dedicated 16-A rail with automatic phase interleaving - eliminates need for external phase controllers in high-current ADAS SoC supplies |
| Programmable Slew Rate | 0.47–10 mV/µs via register control - prevents overshoot during dynamic voltage scaling and reduces inrush stress on downstream capacitors |
| Integrated Current Sensing | 20.47 A full-scale, 20 mA LSB, <10% error - enables real-time load monitoring without adding sense resistors or PCB area |
| Automated Phase Management | Hardware-based phase add/shed at precise current thresholds (e.g., 2.4 A → enable 4th phase) - maximizes efficiency without firmware intervention |
| Automotive Safety Compliance | AEC-Q100 Grade 1 (–40°C to +125°C), HBM ±2 kV, CDM ±500 V - qualified for safety-critical cluster and radar applications |
Applications
| Automotive Digital Cluster | Radar Signal Processor Supply |
|---|---|
Use Scenario: Powers application processor and GPU in digital instrument clusters requiring fast voltage transitions during animation rendering. IC Role / Device Role / Timing Role: Primary 4-phase buck regulator delivering 1.1 V @ 12 A with <±40 mV transient deviation under 1-µs load steps. Use Value: Remote sensing and programmable slew rate maintain ±1% output accuracy despite PCB trace resistance, ensuring stable GPU operation during burst workloads. |
Use Scenario: Supplies 1.0 V core rail to millimeter-wave radar SoC with strict low-noise and fast transient requirements. IC Role / Device Role / Timing Role: Single-rail 4-phase converter operating at 2 MHz with spread-spectrum modulation to suppress switching noise near RF front-end. Use Value: Phase interleaving reduces input/output ripple by 4× versus single-phase, easing EMI filter design and meeting CISPR 25 Class 5 limits. |
| ADAS Camera Image Signal Processor | Automotive Infotainment Application Processor |
Use Scenario: Provides 0.85 V core voltage to ISP in surround-view camera module with thermal constraints in sealed housing. IC Role / Device Role / Timing Role: 4-phase buck with die-temperature monitoring triggers warning at 125°C and shutdown at 150°C before silicon damage. Use Value: Integrated thermal protection eliminates need for external sensor and reduces BOM count while meeting ISO 26262 ASIL-B functional safety goals. |
Use Scenario: Delivers 1.2 V @ 16 A to quad-core application processor in head-unit with coordinated power sequencing. IC Role / Device Role / Timing Role: Uses EN1/EN2/EN3 GPIOs to control external LDOs and assert processor reset, synchronized to VOUT ramp timing. Use Value: Hardware-based startup sequence ensures correct power-up order without software dependency - critical for boot reliability. |
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 |
|---|---|---|---|
| LP87562IRNFTQ1 | Configurable as 3-phase + 1-phase outputs (not 4-phase only); identical pinout and I²C register map | Supports mixed-rail systems (e.g., 1.0 V core + 3.3 V I/O) where LP87561IRNFTQ1's fixed 4-phase architecture is insufficient | Select LP87562IRNFTQ1 when dual independent rails are required; LP87561IRNFTQ1 remains optimal for single high-current rail |
| TPS65917B1RSLR | 7-channel PMIC with 3 buck converters (max 3 A each), no 4-phase capability; uses same VQFN-48 package but different pinout | Targets lower-power infotainment SoCs needing multiple independent rails rather than ultra-high-current single rail | Choose TPS65917B1RSLR for multi-rail, lower-current (<3 A/rail) designs; LP87561IRNFTQ1 is superior for >12 A single-rail ADAS loads |
Compared with LP87562IRNFTQ1 and TPS65917B1RSLR, the LP87561IRNFTQ1 uniquely delivers 16-A single-rail capability in a compact 4.5×4.0 mm package with hardware-managed phase control-making it the only option among the three qualified for high-current radar and digital cluster applications demanding minimal board space and maximum efficiency at full load.
Availability
LP87561IRNFTQ1 is available at Aetrix Electronics and suitable for automotive digital cluster, radar signal processor, and ADAS camera image signal processor applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LP87561IRNFTQ1 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 ICs and broad manufacturing scale.
The LP8756x-Q1 product line was designed specifically for automotive ADAS and infotainment platforms, addressing the need for high-efficiency, high-current, and functionally safe DC/DC conversion in space-constrained ECU modules.
FAQ
What is the maximum output current supported by the LP87561IRNFTQ1?
The LP87561IRNFTQ1 supports up to 16 A total output current in its fixed 4-phase configuration, with 4 A per phase. This rating assumes input voltage ≥3 V and proper thermal management - at 2.8 V ≤ VIN < 3 V, max output drops to 12 A due to reduced headroom. The device enforces forward current limits (1.5–5 A per phase) and thermal shutdown (150°C) to protect against overload conditions.
Does the LP87561IRNFTQ1 support external clock synchronization?
Yes, the LP87561IRNFTQ1 supports external clock synchronization via the CLKIN pin, accepting input frequencies from 1 MHz to 24 MHz with ±30% accuracy tolerance. When enabled, the internal PLL locks to the external clock, allowing system-wide timing alignment to reduce beat-frequency EMI - a critical feature for radar and camera modules co-located on the same PCB.
Can the LP87561IRNFTQ1 be used in non-automotive applications?
While the LP87561IRNFTQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient) and optimized for automotive use, its electrical specifications - including 2.8–5.5 V input, 0.6–3.36 V output, and 2 MHz switching - are technically valid for industrial or computing applications. However, TI does not guarantee non-automotive qualification, and users must validate reliability, ESD robustness, and thermal performance in their specific environment.
How does the LP87561IRNFTQ1 handle load transients?
The LP87561IRNFTQ1 achieves ±40 mV load-step response for 0.1–8 A transitions (1-µs edge) in 4-phase mode using hardware-based phase shedding/addition and adaptive loop compensation. Its remote differential sensing (FB_Bx + complementary ground sense) corrects for PCB IR drop, maintaining output regulation accuracy within ±2% even under dynamic loads typical of ADAS SoCs during frame processing bursts.
Is the LP87561IRNFTQ1 pin-compatible with other LP8756x-Q1 variants?
No, the LP87561IRNFTQ1 is not pin-compatible with LP87562–LP87565-Q1 despite sharing the same VQFN-HR-26 package. While pin count and footprint match, the internal routing of FB/VIN/SW pins differs across variants to support their distinct phase configurations (e.g., LP87562 uses separate FB paths for 3-phase + 1-phase rails). Interchanging them without layout revision will cause functional failure.
LP87561IRNFTQ1 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:
- 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
- Supplier Device Package:
- 26-VQFN-HR (4.5x4)
LP87561IRNFTQ1 FAQ
1.How can I place an order for LP87561IRNFTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP87561IRNFTQ1 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 LP87561IRNFTQ1 reliable?
The price and inventory of LP87561IRNFTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP87561IRNFTQ1 is usually 5 days.
3.What payment methods are accepted for LP87561IRNFTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP87561IRNFTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP87561IRNFTQ1?
LP87561IRNFTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP87561IRNFTQ1 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 LP87561IRNFTQ1?
For technical support, including LP87561IRNFTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP87561IRNFTQ1 requirements.
6.How does Aetrix verify that LP87561IRNFTQ1 is sourced from the original manufacturer or authorized distributors?
All LP87561IRNFTQ1 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 LP87561IRNFTQ1 meets industry standards.
7.What is the process for return or replacement of LP87561IRNFTQ1?
All LP87561IRNFTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP87561IRNFTQ1, 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 LP87561IRNFTQ1 part is unused and in its original packaging.
Return procedure for LP87561IRNFTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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