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Texas Instruments LMQ61460AFSQRJRRQ1
- Part No.:
- LMQ61460AFSQRJRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
LMQ61460AFSQRJRRQ1.pdf
- Description:
- IC REG BUCK ADJ 6A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,600
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Product details
Overview
LMQ61460AFSQRJRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 6A output current across a 3V–36V input range, featuring FPWM mode operation, integrated MOSFETs, and MINT 2 EMI mitigation architecture. It supports 42V load dump, achieves 0.4V dropout at 4A, and delivers 95% efficiency at 4A/5V with 400kHz switching.
For engineers reviewing the LMQ61460AFSQRJRRQ1 datasheet, LMQ61460AFSQRJRRQ1 pinout, LMQ61460AFSQRJRRQ1 application, or LMQ61460AFSQRJRRQ1 equivalent, key selection considerations include FPWM-only operation (no auto-mode), adjustable SW rise time via RBOOT, CISPR25 Class 5 compliance, 14-pin VQFN-HR package with wettable flanks, and functional safety documentation support.
Technical Context
The LMQ61460AFSQRJRRQ1 implements peak-current-mode control with fixed-frequency FPWM operation-no frequency foldback or PFM transitions. Its MINT 2 architecture integrates bypass capacitors, pseudo-random spread spectrum (±2% span), parallel VIN paths (VIN1/VIN2), and adjustable SW node rise time via external RBOOT resistor to suppress conducted and radiated emissions.
It features dual power grounds (PGND1/PGND2), internal 3.3V VCC LDO, BIAS pin for external bias supply, and precision enable/sync input supporting both UVLO programming and external clock synchronization. Thermal shutdown triggers at 158°C–180°C with 10°C hysteresis, and junction temperature is rated from –40°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V continuous; withstands 42V load dump for 400ms-enables direct battery connection without external TVS. |
| Output Current | Up to 6A DC; high-side RDS(on) = 41mΩ (typ), low-side RDS(on) = 21mΩ (typ)-minimizes conduction loss in compact layouts. |
| Switching Frequency | Adjustable 200kHz–2.2MHz via RT pin or external sync signal-supports AM-band avoidance and size-optimized designs. |
| EMI Performance | CISPR25 Class 5 compliant; MINT 2 architecture includes spread spectrum, internal bypass caps, and HotRod™ package-reduces need for shielding or ferrites. |
| Quiescent Current | 7µA (typ) at no load, 13.5VIN, 3.3VOUT-suitable for always-on automotive modules with strict standby power budgets. |
| Dropout Voltage | 0.4V (typ) at 4A, 3.3VOUT-maintains regulation during cold-crank transients down to 3.95VIN. |
| Operating Temp | –40°C to +150°C junction temperature (AEC-Q100 Grade 1)-validated for under-hood and infotainment applications. |
Pinout & Package
The LMQ61460AFSQRJRRQ1 is housed in a 14-pin VQFN-HR (RJR) package measuring 4.0mm × 3.5mm with wettable flanks for automated optical inspection. The thermally enhanced exposed pad improves thermal dissipation in high-power automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS | External bias supply input | Connects to output voltage rail to improve light-load efficiency; optional 0.1–1µF capacitor to AGND enhances noise immunity. |
| VCC | Internal LDO output | 3.3V regulated supply for internal circuitry; requires 1µF capacitor to AGND-no external loading permitted. |
| AGND | Analog reference ground | Reference for FB and VCC; must be connected to both PGND1 and PGND2 on PCB to minimize ground bounce. |
| FB | Feedback voltage input | Senses output voltage; connects directly to divider tap for adjustable outputs or factory-set 3.3V/5V options. |
| PGOOD | Open-drain power-good status | Signals regulation status (high = OK); active-low fault indication with 92–96.5% undervoltage and 105–110% overvoltage thresholds. |
| RT | Frequency setting input | Resistor-to-ground (5.76kΩ–66.5kΩ) sets switching frequency from 200kHz to 2.2MHz-enables precise EMI band placement. |
| EN/SYNC | Enable & synchronization input | Logic-level enable with 1.263V threshold; also accepts external clock (200kHz–2.2MHz) for forced PWM synchronization. |
| VIN1 / VIN2 | Dual input power pins | Parallel high-current paths reduce parasitic inductance; each requires local high-quality bypass capacitors to respective PGND. |
| PGND1 / PGND2 | Power ground terminals | Separate low-side MOSFET return paths; low-impedance interconnection between them minimizes ground loop noise. |
| SW | Switch node output | Drives external inductor; rise time adjustable via RBOOT–CBOOT network-critical for optimizing EMI vs. efficiency trade-off. |
| RBOOT | SW rise time control | Resistor between RBOOT and CBOOT sets SW edge rate; 0Ω gives fastest rise (~2.15ns), 100Ω slows it (~2.7ns). |
| CBOOT | High-side gate driver supply | Connected to SW via 100nF capacitor; internal diode charges it from VCC-ensures robust high-side drive during duty cycles. |
Key Features
| Feature | Design Value |
|---|---|
| FPWM-only operation | Eliminates PFM mode transitions-ensures constant switching frequency for predictable EMI and timing-critical systems. |
| MINT 2 EMI architecture | Integrates spread spectrum, internal bypass caps, parallel VIN paths, and adjustable SW rise time-meets CISPR25 Class 5 without external filters. |
| HotRod™ VQFN-HR package | Minimizes switch-node ringing and parasitic inductance-reduces radiated emissions and improves layout robustness. |
| 42V load dump tolerance | Withstands automotive transients per ISO 7637-2 Pulse 5a-enables direct connection to 12V/24V battery rails without upstream protection. |
| Functional safety support | Documentation available for ISO 26262 ASIL-B system integration-including FIT data, failure modes, and diagnostic coverage analysis. |
Applications
| Automotive Infotainment Head Unit Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC, display interface, and USB-C PD controller in centralized head unit with stringent EMI limits near AM/FM receivers. IC Role / Device Role / Timing Role: Primary 5V/3.3V step-down regulator delivering stable 6A output; operates at 2.1MHz to avoid AM band interference. Use Value: MINT 2 architecture eliminates need for metal shielding; FPWM ensures deterministic noise profile compatible with RF-sensitive subsystems. | Use Scenario: Supplies image sensor, ISP, and serializer in front-facing ADAS camera exposed to engine bay temperature extremes. IC Role / Device Role / Timing Role: High-reliability 3.3V buck converter with 150°C junction rating and soft-dropout recovery during cold-crank events. Use Value: 0.4V dropout at 4A maintains regulation down to 3.95VIN; AEC-Q100 Grade 1 qualification ensures lifetime reliability in harsh thermal environments. |
| Body Control Module (BCM) Core Rail | Automotive USB Charging Port |
Use Scenario: Generates 5V core rail for microcontroller, CAN transceivers, and LIN interfaces in door module or seat control unit. IC Role / Device Role / Timing Role: Always-on power source with 7µA quiescent current; supports wake-up via EN pin with programmable UVLO. Use Value: Ultra-low IQ extends battery life during vehicle sleep mode; dual VIN/PGND pins simplify high-current PCB routing in space-constrained modules. | Use Scenario: Delivers 5V@3A to USB-A/USB-C ports in center console with minimal board area and no audible noise. IC Role / Device Role / Timing Role: Compact 4mm×3.5mm buck converter operating at 2.2MHz-enables use of 1µH inductors and ceramic capacitors only. Use Value: Small solution size meets tight mechanical envelopes; FPWM mode prevents inductor coil whine common in PFM-based chargers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ61460AASQRJRRQ1 | Auto-mode (PWM/PFM hybrid) instead of FPWM-only; 7µA IQ same, but light-load efficiency optimized via frequency foldback. | Better suited for battery-backed modules requiring lowest possible standby power across wide load range. | Select LMQ61460AASQRJRRQ1 when variable-frequency operation is acceptable and ultra-low IQ at µA loads is critical. |
| LM61460QRJRRQ1 | Non-MINT version; lacks spread spectrum, internal bypass caps, and RBOOT-adjustable rise time-higher EMI, no CISPR25 Class 5 compliance. | Acceptable for non-EMI-sensitive body electronics where cost is prioritized over certification requirements. | Select LM61460QRJRRQ1 only if CISPR25 Class 5 is not required and layout-level EMI filtering is feasible. |
Compared with LMQ61460AASQRJRRQ1, the LMQ61460AFSQRJRRQ1 trades light-load adaptability for deterministic EMI behavior; versus LM61460QRJRRQ1, it adds certified low-noise operation at minor BOM cost-making it optimal for RF-dense infotainment and ADAS domains.
Availability
LMQ61460AFSQRJRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera power, body control modules, and USB charging applications requiring stable component supply, AEC-Q100 qualification, and CISPR25 Class 5 compliance.
Supply support for LMQ61460AFSQRJRRQ1 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, embedded processing, and automotive-grade power management ICs with decades of automotive qualification expertise.
The LMQ61460-Q1 product line was designed specifically for demanding automotive power conversion-emphasizing EMI robustness, thermal resilience, functional safety readiness, and seamless integration into ASIL-B systems.
FAQ
What distinguishes LMQ61460AFSQRJRRQ1 from the LMQ61460AASQRJRRQ1 variant?
The LMQ61460AFSQRJRRQ1 operates exclusively in forced PWM (FPWM) mode, ensuring constant switching frequency for predictable EMI and timing-critical applications. In contrast, the LMQ61460AASQRJRRQ1 uses Auto-mode with automatic PWM-to-PFM transition at light loads, achieving slightly lower quiescent current under dynamic load conditions. Both share identical pinout, package, and MINT 2 EMI features-but LMQ61460AFSQRJRRQ1 is selected when frequency stability outweighs ultra-low-IQ optimization.
Does LMQ61460AFSQRJRRQ1 support external clock synchronization?
Yes, the LMQ61460AFSQRJRRQ1 supports external clock synchronization via its EN/SYNC pin. When driven with a clean square wave (200kHz–2.2MHz), the device locks its switching frequency to the external source and operates in forced PWM mode-disabling PFM behavior. This capability enables system-level timing alignment across multiple converters and simplifies EMI mitigation in multi-rail automotive ECUs.
What is the purpose of the RBOOT pin on LMQ61460AFSQRJRRQ1?
The RBOOT pin on LMQ61460AFSQRJRRQ1 controls the rise time of the SW node by adjusting the gate drive strength of the high-side MOSFET. Connected between RBOOT and CBOOT via a resistor (0Ω–open), it allows designers to fine-tune EMI performance versus efficiency: lower resistance yields faster rise time (~2.15ns) and higher efficiency, while higher resistance slows the edge (~2.7ns) to reduce high-frequency spectral content-critical for meeting CISPR25 Class 5 limits.
Can LMQ61460AFSQRJRRQ1 operate with input voltage below 3.0V after startup?
No-LMQ61460AFSQRJRRQ1 requires a minimum input voltage of 3.0V to maintain full functionality after startup. While it starts up at 3.95V (due to internal UVLO hysteresis), operation below 3.0V is outside the recommended operating conditions. At VIN < 3.0V, regulation cannot be guaranteed, and parameters such as dropout voltage, efficiency, and PGOOD accuracy are not specified. For cold-crank scenarios, ensure system design maintains VIN ≥ 3.0V during transient dips.
Is LMQ61460AFSQRJRRQ1 qualified for ASIL-B functional safety applications?
The LMQ61460AFSQRJRRQ1 is functional safety-capable with documentation available to support ISO 26262 ASIL-B system development-including FIT rate data, failure mode analysis, and diagnostic coverage guidance. However, it is not ASIL-B certified as a standalone component; safety mechanisms must be implemented at the system level. Texas Instruments provides safety manuals and FMEDA reports to aid architects in qualifying the LMQ61460AFSQRJRRQ1 within their specific automotive safety architecture.
LMQ61460AFSQRJRRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-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):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 34.2V
- Current - Output:
- 6A
- Frequency - Switching:
- 200kHz ~ 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:
- 14-VQFN-HR (4x3.5)
LMQ61460AFSQRJRRQ1 FAQ
1.How can I place an order for LMQ61460AFSQRJRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMQ61460AFSQRJRRQ1 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 LMQ61460AFSQRJRRQ1 reliable?
The price and inventory of LMQ61460AFSQRJRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMQ61460AFSQRJRRQ1 is usually 5 days.
3.What payment methods are accepted for LMQ61460AFSQRJRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMQ61460AFSQRJRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMQ61460AFSQRJRRQ1?
LMQ61460AFSQRJRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMQ61460AFSQRJRRQ1 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 LMQ61460AFSQRJRRQ1?
For technical support, including LMQ61460AFSQRJRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMQ61460AFSQRJRRQ1 requirements.
6.How does Aetrix verify that LMQ61460AFSQRJRRQ1 is sourced from the original manufacturer or authorized distributors?
All LMQ61460AFSQRJRRQ1 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 LMQ61460AFSQRJRRQ1 meets industry standards.
7.What is the process for return or replacement of LMQ61460AFSQRJRRQ1?
All LMQ61460AFSQRJRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMQ61460AFSQRJRRQ1, 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 LMQ61460AFSQRJRRQ1 part is unused and in its original packaging.
Return procedure for LMQ61460AFSQRJRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMQ61460AFSQRJRRQ1 Tags
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