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Texas Instruments LMQ64480QRXARQ1
- Part No.:
- LMQ64480QRXARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 24-PowerTFQFN
- Datasheet:
-
LMQ64480QRXARQ1.pdf
- Description:
- IC REG BUCK ADJ/0.8V DL 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,946
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Product details
Overview
LMQ64480QRXARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter supporting dual 4A outputs or stackable 8A operation, with 3V–36V input range, 0.8V–20V adjustable output, and 50ns minimum on-time for high VIN/VOUT ratios - deployed in infotainment head units and ADAS power rails.
For engineers reviewing the LMQ64480QRXARQ1 datasheet, LMQ64480QRXARQ1 pinout, LMQ64480QRXARQ1 application, or LMQ64480QRXARQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed EMI mitigation features per CISPR 25 Class 5, and real-world dual-buck implementation constraints including wettable-flank QFN-24 thermal performance and dual-channel PGOOD timing.
Technical Context
The LMQ64480QRXARQ1 implements interleaved current-mode control with dual independent PWM channels, enabling precise current sharing across stacked phases and fast transient response under load steps up to 4A/µs. Its architecture supports phase synchronization via SYNC/SYNC_OUT pins and configurable FPWM or diode emulation mode via SYNC and MODE pins.
It integrates four 22nF VIN-to-GND bypass capacitors, symmetrical input pin layout with >1mm clearance, and Dual Random Spread Spectrum (±10% modulation) to meet CISPR 25 Class 5 conducted emissions without external filters. The bias pin enables self-powered operation, achieving 9µA no-load quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports automotive battery transients including cold-crank (down to 3V at near-100% duty cycle) and load dump. |
| Output Current (Dual) | 4A per channel - rated for continuous dual-output operation; stackable to 8A with matched-phase interleaving. |
| Switching Frequency | 100kHz to 2.2MHz - programmable via RT resistor; supports synchronization to external clock or multi-device phase alignment. |
| Min. On/Off Time | 50ns / 80ns - enables direct 12V→1.8V or 24V→3.3V conversion without intermediate stages. |
| Quiescent Current | 9µA typical no-load (dual output) - extends battery runtime in always-on automotive modules. |
| Feedback Accuracy | ±1% over –40°C to +125°C ambient - ensures stable rail regulation across full automotive temperature range. |
| EMI Compliance | CISPR 25 Class 5 - achieved with integrated capacitors, spread spectrum, and optimized HotRod QFN package. |
Pinout & Package
LMQ64480QRXARQ1 uses a 24-pin Enhanced HotRod™ QFN (RXA) package with wettable flanks (4.0mm × 5.0mm body), optimized for automated optical inspection and low thermal resistance (RθJA = 17°C/W on EVM).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 | Input supply inputs | Dual independent 3V–36V inputs; require low-impedance connection to respective PGND pins and local 22nF bypass caps. |
| SW1, SW2 | Power switching nodes | Connect directly to inductor high-side terminals; drive internal high-side NMOS and low-side synchronous rectifier. |
| PGND1–PGND4 | Power ground terminals | Four dedicated power ground pins minimize ground bounce; must be tied to common system ground plane with low-inductance paths. |
| FB1, FB2 | Output voltage feedback inputs | 0.8V reference threshold; support fixed 3.3V/5V (via resistor to VCC/AGND) or adjustable 0.8V–20V via resistive divider. |
| EN1, EN2 | Channel enable inputs | Active-high logic (1.375V threshold); independent control of each output; floating prohibited. |
| PG1, PG2 | Power-good open-drain outputs | Assert low when output deviates >5% from regulation; require external pull-up for system monitoring. |
| SYNC / SYNC_OUT | Multi-function sync interface | In dual output: SYNC selects FPWM/diode emulation; in single-output stack: SYNC_IN (primary) and SYNC_OUT (secondary) coordinate phase timing. |
| RT | Frequency programming input | Resistor to AGND sets switching frequency from 100kHz to 2.2MHz; enables EMI tuning and layout optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated EMI reduction | Four 22nF VIN-to-GND capacitors + symmetrical input pin layout + ±10% DRSS modulation - eliminates need for external EMI filter in CISPR 25 Class 5 designs. |
| Wettable-flank QFN package | RXA 24-pin VQFN-FCRLF with solderable side walls - enables 100% automated visual inspection (AVI) for automotive production traceability. |
| Stackable dual-output architecture | Interleaved current-mode control with phase-shifted switching - achieves accurate current sharing and reduced output ripple when stacking multiple LMQ64480QRXARQ1 devices. |
| Bias-powered ultra-low IQ | 9µA no-load quiescent current - enabled by biasing from regulated output rail, extending battery life in always-on vehicle modules. |
| Robust protection suite | Hiccup-mode overcurrent (6.2A HS peak limit), thermal shutdown (168°C), and precision PGOOD with hysteresis - ensures fail-safe operation in safety-critical ADAS subsystems. |
Applications
| Automotive Infotainment Head Unit | ADAS Camera Power Supply |
|---|---|
|
Use Scenario: Powering SoC core, DDR memory, and display interface in a 12V-powered automotive head unit requiring clean, low-noise 1.1V, 1.8V, and 3.3V rails. IC Role / Device Role / Timing Role: Dual-output buck regulator delivering independent 4A/4A outputs with synchronized switching to suppress beat frequencies and reduce conducted EMI. Use Value: Meets CISPR 25 Class 5 without ferrite beads or LC filters, reducing BOM cost and PCB area while maintaining <1% output accuracy across –40°C to +125°C. |
Use Scenario: Generating isolated 3.3V and 5V supplies for image sensor, ISP, and serializer in a rear-view camera module. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter operating in FPWM mode to ensure constant-frequency operation during low-light video capture with minimal noise coupling into analog signal paths. Use Value: 50ns tON(min) enables direct 12V→3.3V conversion, eliminating intermediate stages; wettable-flank package ensures reliable reflow in compact camera PCBs. |
| Body Control Module (BCM) Dual Rail | Automotive USB-C Charging Hub |
|
Use Scenario: Providing 5V for microcontroller and CAN transceiver, plus 3.3V for sensors and LIN interface in a centralized BCM. IC Role / Device Role / Timing Role: Dual-output buck with independent ENABLE/PGOOD per channel - allows sequenced power-up and fault isolation between subsystems. Use Value: 0.5µA shutdown current and 9µA no-load IQ extend sleep-mode battery life; hiccup-mode OCP prevents thermal runaway during short-circuit events. |
Use Scenario: Delivering 5V/3A and 9V/3A outputs for USB-C PD negotiation in a vehicle-mounted charging hub powered from 12V battery. IC Role / Device Role / Timing Role: Dual-output buck configured as primary-secondary stack (one device per rail) with SYNC-driven interleaving to reduce input capacitor RMS current. Use Value: Stackable architecture supports scalable 8A total output; integrated 22nF caps lower high-frequency impedance, improving transient response during PD voltage transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ61460QRJNRQ1 | Single 6A output, 3V–36V, 1.5MHz fixed frequency, no dual-output or stacking capability. | Suitable only for single-rail systems; lacks independent channel control, PGOOD per rail, and interleave synchronization. | Select when only one high-current rail is needed and board space is constrained - smaller 10-pin WQFN package but no dual-channel flexibility. |
| TPS546B24ARVFT | Single 24A digital multiphase controller (PMBus), requires external FETs, 4.5V–18V input, no integrated caps or wettable flanks. | Targets high-end ADAS domain controllers needing dynamic voltage scaling and telemetry; not qualified for AEC-Q100 Grade 1. | Choose for programmable VOUT, margining, and telemetry in non-safety-critical compute modules - adds design complexity but enables real-time monitoring. |
Compared with LMQ64480QRXARQ1, LMQ61460QRJNRQ1 offers higher single-rail current but no dual output or stacking, while TPS546B24ARVFT provides digital control and scalability at the cost of external components, larger footprint, and no AEC-Q100 Grade 1 qualification.
Availability
LMQ64480QRXARQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body electronics requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LMQ64480QRXARQ1 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 LMQ644xx-Q1 product line is designed specifically for high-density, low-EMI automotive power delivery - targeting infotainment, ADAS, and body electronics where AEC-Q100 Grade 1 reliability, stackable current capacity, and CISPR 25 compliance are mandatory.
FAQ
What is the maximum junction temperature rating for LMQ64480QRXARQ1?
The LMQ64480QRXARQ1 is rated for operation up to 150°C junction temperature, with thermal shutdown triggered at 168°C and 10°C hysteresis. This Grade 1 AEC-Q100 qualification ensures reliable function in under-hood and dashboard environments where ambient reaches +125°C.
Does LMQ64480QRXARQ1 support fixed 3.3V and 5V outputs without external resistors?
Yes, LMQ64480QRXARQ1 supports fixed 3.3V and 5V outputs via internal feedback configuration: connect FB1 or FB2 to AGND for 3.3V, or to VCC through a 10kΩ resistor for 5V. No external divider is required, simplifying layout for standard rails.
How does the wettable-flank package of LMQ64480QRXARQ1 improve manufacturing yield?
The RXA package's wettable flanks enable 100% automated visual inspection (AVI) post-reflow, verifying solder joint integrity on all 24 perimeter pads. This eliminates manual X-ray checks, reduces inspection time, and improves first-pass yield in high-reliability automotive assembly lines.
Can LMQ64480QRXARQ1 operate in forced PWM (FPWM) mode across all load conditions?
Yes, LMQ64480QRXARQ1 supports FPWM mode via the SYNC pin: tie SYNC to VCC to enforce continuous conduction regardless of load. This eliminates audible noise and ensures predictable EMI behavior - critical for camera and audio subsystems.
What is the minimum recommended output capacitance for stable operation of LMQ64480QRXARQ1?
TI recommends ≥22µF ceramic output capacitance per channel (e.g., two 10µF + one 2.2µF) with low ESR. The LMQ64480QRXARQ1's built-in compensation supports this range; insufficient capacitance may cause instability or excessive output voltage deviation during load transients.
LMQ64480QRXARQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMQ644xx-Q1
- Package/Case:
- 24-PowerTFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.8V (3.3V, 5V)
- Voltage - Output (Max):
- 20V
- Current - Output:
- 4A, 4A
- Frequency - Switching:
- 100kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 24-VQFN-FCRLF (4x5)
LMQ64480QRXARQ1 FAQ
1.How can I place an order for LMQ64480QRXARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMQ64480QRXARQ1 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 LMQ64480QRXARQ1 reliable?
The price and inventory of LMQ64480QRXARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMQ64480QRXARQ1 is usually 5 days.
3.What payment methods are accepted for LMQ64480QRXARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMQ64480QRXARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMQ64480QRXARQ1?
LMQ64480QRXARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMQ64480QRXARQ1 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 LMQ64480QRXARQ1?
For technical support, including LMQ64480QRXARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMQ64480QRXARQ1 requirements.
6.How does Aetrix verify that LMQ64480QRXARQ1 is sourced from the original manufacturer or authorized distributors?
All LMQ64480QRXARQ1 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 LMQ64480QRXARQ1 meets industry standards.
7.What is the process for return or replacement of LMQ64480QRXARQ1?
All LMQ64480QRXARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMQ64480QRXARQ1, 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 LMQ64480QRXARQ1 part is unused and in its original packaging.
Return procedure for LMQ64480QRXARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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