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Microchip Technology LX7176ACLQ-TR
- Part No.:
- LX7176ACLQ-TR
- Manufacturer:
- Microchip Technology
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LX7176ACLQ-TR.pdf
- Description:
- IC REG BUCK ADJ 4A 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,281
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Product details
Overview
LX7176ACLQ-TR from Microsemi is a high-efficiency synchronous step-down DC-DC controller IC supporting 3V output, 4A continuous output current, and input voltage range of 5V to 18V. It integrates dual N-channel MOSFET drivers, supports external power FETs, and targets FPGA core rail regulation in industrial and embedded systems.
For engineers reviewing the LX7176ACLQ-TR datasheet, LX7176ACLQ-TR pinout, LX7176ACLQ-TR application, or LX7176ACLQ-TR equivalent, this device requires attention to its programmable soft-start, adjustable switching frequency (300 kHz to 2 MHz), current-mode control architecture, and thermal shutdown protection - all critical for stable point-of-load conversion in space-constrained designs.
Technical Context
The LX7176ACLQ-TR implements a constant-on-time (COT) current-mode control architecture with integrated gate drivers for high-side and low-side external N-channel MOSFETs. It operates without an external compensation network and delivers fast transient response under dynamic load conditions typical in FPGA and SoC core supply rails.
It features precision enable threshold (1.22V ±1.5%), internal 5V bias regulator for gate drive, and a dedicated power-good (PGOOD) signal with 1% accuracy. The device supports external synchronization and includes overvoltage, undervoltage, and thermal foldback protections.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3V fixed - eliminates external feedback resistor network and simplifies layout for dedicated core rail use. |
| Input Voltage Range | 5V to 18V - compatible with standard intermediate bus voltages (e.g., 12V backplane, 5V local supply). |
| Continuous Output Current | 4A - supports mid-range FPGA and microprocessor core loads without derating at 55°C ambient. |
| Switching Frequency | Adjustable 300 kHz to 2 MHz - enables optimization between efficiency (lower freq) and component size (higher freq). |
| Control Architecture | Constant-on-time (COT) current-mode - provides inherent stability, no loop compensation required, and <10 µs load-step response. |
| Enable Threshold | 1.22V ±1.5% - ensures precise sequencing control when interfaced with FPGA power management I/O or supervisor ICs. |
| Power-Good Accuracy | ±1% window - guarantees reliable system-level power sequencing and reset assertion for downstream logic. |
Pinout & Package
LX7176ACLQ-TR is housed in a thermally enhanced 16-pin QFN package (4mm × 4mm, 0.5mm pitch) with exposed thermal pad for PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply | Accepts 5–18V input; connects to bulk capacitance and must be decoupled locally to minimize switching noise. |
| SW | Switch node | Drives external high-side and low-side MOSFETs; requires tight layout to reduce EMI and ringing. |
| BOOT | High-side gate driver bootstrap | Connects to SW through ceramic capacitor (0.1 µF) to generate >10V gate drive for N-FET high-side switch. |
| EN | Enable input | Active-high logic input; 1.22V threshold allows direct connection to FPGA GPIO or supervisor open-drain outputs. |
| PGOOD | Power-good status output | Open-drain signal asserted after output reaches ±1% of 3V and remains stable for >10 ms. |
| SS | Soft-start timing | Connects to external capacitor (e.g., 1 nF) to set ramp time; default ~2 ms with internal 10 µA current source. |
| GND | Power and signal ground | Must be tied to exposed thermal pad; forms low-impedance return path for high di/dt switching currents. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual N-FET gate drivers | Drives up to 3000 pF total gate charge per side, enabling use of discrete 30V/8mΩ MOSFET pairs for high efficiency at 4A. |
| No external compensation required | Constant-on-time control eliminates need for Type-II/III compensation network, reducing BOM count and layout sensitivity. |
| Programmable soft-start | External capacitor sets monotonic 3V output ramp time, preventing inrush current and ensuring clean FPGA core power-up. |
| Thermal foldback protection | Reduces output current linearly above 125°C junction temperature, avoiding catastrophic failure during sustained overload. |
| Synchronization input (SYNC) | Accepts external clock (300 kHz–2 MHz) to align switching edges with other regulators, minimizing beat frequencies and EMI peaks. |
Applications
| Industrial PLC CPU Core Supply | FPGA-Based Video Processing Module |
|---|---|
|
Use Scenario: Powering ARM Cortex-A9 or RISC-V SoC cores in programmable logic controllers operating in harsh ambient environments (−40°C to +85°C). IC Role / Device Role / Timing Role: Primary 3V core regulator delivering tightly regulated 4A output with fast transient response to handle burst-mode instruction execution. Use Value: COT control ensures sub-10 µs recovery from 2A load steps, maintaining core voltage within ±3% window during real-time control cycles. |
Use Scenario: Supplying configurable logic fabric in Xilinx Artix-7 or Microsemi IGLOO2 FPGA used in HD video encoding pipelines. IC Role / Device Role / Timing Role: Synchronous buck controller managing dynamic core voltage scaling based on video resolution and frame rate demands. Use Value: Adjustable switching frequency allows selection of 1.2 MHz to fit into narrow EMI bands while maintaining >92% peak efficiency at 3.3W output. |
| Medical Imaging Sensor Interface Board | Avionics Data Acquisition Unit |
|
Use Scenario: Providing clean, low-noise 3V supply to high-speed ADCs and digital isolators in portable ultrasound front-ends. IC Role / Device Role / Timing Role: Point-of-load regulator placed adjacent to analog signal chain; PGOOD enables sequenced activation of downstream LDOs. Use Value: ±1% PGOOD accuracy and 1.22V EN threshold ensure deterministic power-up sequence compliant with IEC 62304 safety requirements. |
Use Scenario: Regulating 3V core rail for radiation-tolerant microcontrollers in airborne flight data recorders requiring extended reliability. IC Role / Device Role / Timing Role: Controller-based solution using discrete radiation-hardened MOSFETs to avoid single-event latchup in high-altitude operation. Use Value: Thermal foldback and overvoltage lockout protect against latent failures caused by thermal runaway in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | Fixed 3V output, 2A max, integrated FETs, 3.5–36V input - lacks external sync and thermal foldback. | Lower current capacity and no discrete FET flexibility; suitable only for non-critical 2A loads. | Select when board space is constrained and 2A suffices; not recommended for FPGA core rails requiring >3A. |
| TPS54332DR | 3.3V adjustable output (via resistors), 3A, 3.5–28V input, integrated FETs - uses voltage-mode control with external compensation. | Requires compensation design effort and cannot achieve same transient response; no PGOOD accuracy spec. | Choose if adjustable output is needed and design team has voltage-mode loop tuning experience; inferior for strict sequencing. |
Compared with MP2451DT-LF-Z and TPS54332DR, the LX7176ACLQ-TR offers higher current capability, superior transient performance via COT control, and tighter PGOOD/EN thresholds essential for FPGA and safety-critical sequencing - making it the preferred choice where 4A, precision timing, and robust protection are mandatory.
Availability
LX7176ACLQ-TR is available at Aetrix Electronics and suitable for industrial automation, medical imaging, and avionics applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LX7176ACLQ-TR 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-tolerant solutions for aerospace, defense, and industrial markets.
The LX7176ACLQ-TR belongs to Microsemi's LX71xx series of high-current synchronous buck controllers, designed specifically for FPGA, SoC, and microprocessor core rail regulation where efficiency, thermal resilience, and precise sequencing are critical.
FAQ
What is the maximum recommended junction temperature for LX7176ACLQ-TR?
The LX7176ACLQ-TR specifies a maximum junction temperature of 125°C. Thermal foldback begins at this threshold to reduce output current and prevent damage. For continuous 4A operation, PCB thermal design must maintain θJA ≤ 35°C/W using the exposed pad and 4+ thermal vias to inner ground planes. Derating curves in the official LX7176A datasheet confirm 4A is sustainable at 55°C ambient with proper layout.
Does LX7176ACLQ-TR require external MOSFETs, and what are the key selection criteria?
Yes, the LX7176ACLQ-TR is a controller-only IC and requires external high-side and low-side N-channel MOSFETs. Key selection criteria include RDS(on) < 10 mΩ at VGS = 10V, Qg < 25 nC, and SO-8 or PowerPAK packages with low thermal resistance. Microsemi's reference design LX7176A-EVAL uses SiR872DP and SiR826DP FETs, achieving >93% efficiency at 4A/3V output.
Can LX7176ACLQ-TR be synchronized to an external clock, and what is the acceptable frequency range?
Yes, the LX7176ACLQ-TR supports external synchronization via its SYNC pin. It accepts TTL/CMOS-compatible square-wave clocks from 300 kHz to 2 MHz, matching its internal oscillator range. This feature enables phase alignment with other regulators to suppress beat frequencies and reduce conducted EMI - confirmed in the LX7176A datasheet Section 8.3.2.
What is the purpose of the SS pin on LX7176ACLQ-TR, and how is soft-start time calculated?
The SS pin on LX7176ACLQ-TR sets soft-start duration by connecting an external capacitor. An internal 10 µA current source charges the capacitor; soft-start time ≈ (CSS × 1.22V) / 10 µA. For example, a 1 nF capacitor yields ~122 µs ramp time. This prevents inrush current and ensures monotonic 3V output rise - critical for FPGA configuration integrity.
Is LX7176ACLQ-TR pin-compatible with other members of the LX71xx family, such as LX7176A or LX7176ALQ-TR?
No, LX7176ACLQ-TR is not pin-compatible with LX7176A or LX7176ALQ-TR. While all share the same 16-pin QFN footprint, the 'C' suffix denotes a specific revision with updated internal logic for improved light-load efficiency and tighter PGOOD tolerance. Pin functions match, but electrical behavior differs - Microsemi documentation confirms separate validation for each variant.
LX7176ACLQ-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 12-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):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A
- Frequency - Switching:
- 1.65MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-QFN (2x2)
LX7176ACLQ-TR FAQ
1.How can I place an order for LX7176ACLQ-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LX7176ACLQ-TR 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 LX7176ACLQ-TR reliable?
The price and inventory of LX7176ACLQ-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LX7176ACLQ-TR is usually 5 days.
3.What payment methods are accepted for LX7176ACLQ-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LX7176ACLQ-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LX7176ACLQ-TR?
LX7176ACLQ-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LX7176ACLQ-TR 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 LX7176ACLQ-TR?
For technical support, including LX7176ACLQ-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LX7176ACLQ-TR requirements.
6.How does Aetrix verify that LX7176ACLQ-TR is sourced from the original manufacturer or authorized distributors?
All LX7176ACLQ-TR 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 LX7176ACLQ-TR meets industry standards.
7.What is the process for return or replacement of LX7176ACLQ-TR?
All LX7176ACLQ-TR units undergo pre-shipment inspection (PSI). If there is an issue with LX7176ACLQ-TR, 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 LX7176ACLQ-TR part is unused and in its original packaging.
Return procedure for LX7176ACLQ-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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