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Texas Instruments LMQ62440BPPQRJRRQ1
- Part No.:
- LMQ62440BPPQRJRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
LMQ62440BPPQRJRRQ1.pdf
- Description:
- IC REG BUCK 3.3V 4A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,791
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Product details
Overview
LMQ62440BPPQRJRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 4 A at fixed 3.3 V output, operating from 3 V to 36 V input with 42-V load dump tolerance. It integrates high-side (41 mΩ) and low-side (21 mΩ) MOSFETs, achieves 91% efficiency at 4 A/3.3 V, and features ultra-low EMI design compliant with CISPR-25 Class 5 for infotainment power rails.
For engineers reviewing the LMQ62440BPPQRJRRQ1 datasheet, LMQ62440BPPQRJRRQ1 pinout, LMQ62440BPPQRJRRQ1 application, or LMQ62440BPPQRJRRQ1 equivalent, key selection factors include its fixed 3.3-V output, 2.1-MHz switching frequency, spread-spectrum EMI reduction, adjustable SW node rise time via RBOOT, and VQFN-HR 14-pin wettable-flank package optimized for automotive thermal and layout constraints.
Technical Context
The LMQ62440BPPQRJRRQ1 implements a current-mode control architecture with integrated bypass capacitors and parallel VIN paths to minimize parasitic inductance. Its pseudo-random spread-spectrum modulation operates across a 200 kHz–2.2 MHz synchronization range, while Auto-mode enables frequency foldback to achieve 7 µA no-load quiescent current.
Thermal management is supported by dual PGND pins and a low-RθJA (59°C/W) VQFN-HR package rated for –40°C to +150°C junction temperature. The device supports soft recovery from dropout and includes precision enable (VEN = 1.263 V), PGOOD monitoring, and external bias (BIAS) input for improved light-load efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 36 V; supports 42-V transient load dump for 400 ms without damage |
| Output Voltage | Fixed 3.3 V ±1.3% accuracy over temperature and line; factory-trimmed |
| Max Output Current | 4 A continuous; derated above 125°C junction temperature |
| Switching Frequency | 2.1 MHz nominal; synchronizable from 200 kHz to 2.2 MHz to avoid noise-sensitive bands |
| Quiescent Current | 7 µA typical at no load (VIN = 13.5 V, VOUT = 3.3 V, Auto Mode) |
| Efficiency @ 4 A | 91% typical at 3.3 V out, 13.5 V in, 2.1 MHz, RBOOT = 0 Ω |
| EMI Compliance | CISPR-25 Class 5 certified; enabled by HotRod™ package, internal bypass caps, and spread spectrum |
| Junction Temp Range | –40°C to +150°C; AEC-Q100 Grade 1 qualified |
Pinout & Package
The LMQ62440BPPQRJRRQ1 uses a 14-pin VQFN-HR (RJR) package measuring 4.00 mm × 3.50 mm with wettable flanks for automated optical inspection. Thermal performance is enhanced by dual PGND pins and exposed thermal pad connected to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | External bias supply input | Connects to output rail to improve light-load efficiency; optional 0.1–1 µF capacitor to AGND enhances noise immunity |
| VCC (2) | Internal LDO output | Supplies internal control circuitry; requires 1-µF capacitor to AGND; not for external loading |
| AGND (3) | Analog reference ground | Reference point for FB and VCC; must be tied to both PGND1 and PGND2 on PCB |
| FB (4) | Feedback voltage sense | Connected to feedback divider tap; unused in fixed 3.3-V version but internally terminated |
| PGOOD (5) | Power-good status output | Open-drain signal indicating regulation; pulls low during fault, EN = low, or VIN < 1 V |
| MODE/SYNC (6) | Operating mode control | Selects Auto/FPWM/sync modes; controls spread-spectrum activation via resistor divider |
| EN (7) | Enable input | Precision UVLO threshold (1.263 V); supports adjustable turn-on with external resistor divider |
| VIN1 (8), VIN2 (12) | Main input power inputs | Parallel paths reduce input loop inductance; each requires local high-quality bypass capacitor to respective PGND |
| PGND1 (9), PGND2 (11) | Power ground returns | Dual low-inductance paths for high-side and low-side MOSFET sources; must be low-impedance and joined on PCB |
| SW (10) | Switch node | Connects to output inductor; voltage swings between VIN and GND; critical for EMI layout |
| RBOOT (13) | SW rise-time adjustment | Resistor between RBOOT and CBOOT sets SW node dV/dt; 0 Ω → 2.15 ns, 100 Ω → 2.7 ns (10–80%) |
| CBOOT (14) | High-side gate driver supply | Charged via internal diode from VCC; requires 100-nF capacitor to SW for bootstrap operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C junction operation in automotive environments including engine bay and ADAS modules |
| CISPR-25 Class 5 EMI compliance | Achieved via integrated bypass capacitors, parallel VIN paths, HotRod™ package, and adjustable SW rise time - no external EMI filters required |
| Ultra-low quiescent current | 7 µA typical at no load enables always-on systems like vehicle telematics without battery drain |
| Load-dump robustness | Withstands 42-V transients for 400 ms per ISO 7637-2, eliminating need for upstream TVS clamping in many designs |
| Fixed 3.3-V output option | Factory-trimmed output eliminates external feedback resistors, reducing BOM count and layout area for space-constrained clusters |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage data to accelerate ASIL-B system certification |
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 strict EMI limits. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator delivering stable 4-A rail; operates at 2.1 MHz to avoid AM radio band interference. Use Value: Eliminates need for external EMI filters and reduces solution size by 30% vs. discrete controller+MOSFET solutions. | Use Scenario: Supplies image sensor, ISP, and SerDes in front-facing ADAS camera exposed to under-hood thermal stress. IC Role / Device Role / Timing Role: High-reliability 3.3-V source with 150°C junction rating and soft-dropout recovery to maintain uptime during cold cranking. Use Value: Enables single-rail design with no external thermal derating components, simplifying thermal modeling and validation. |
| Automotive Digital Cluster Display | Body Control Module Microcontroller Rail |
Use Scenario: Provides clean 3.3-V supply to TFT-LCD timing controller and touch MCU in digital instrument cluster. IC Role / Device Role / Timing Role: Fixed-output buck converter with PGOOD monitoring and precise enable threshold for controlled power sequencing. Use Value: Ensures deterministic startup timing and prevents display artifacts during ignition cycles. | Use Scenario: Powers 32-bit ARM Cortex-M7 MCU and CAN transceiver in door module with intermittent 12-V battery input. IC Role / Device Role / Timing Role: Input-tolerant buck regulator supporting wide VIN range and 42-V load dump without external protection. Use Value: Reduces component count by integrating protection, enabling smaller PCB footprint and lower assembly cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ62440APPQRJRRQ1 | Adjustable output (1 V to VIN × 0.95); same pinout, package, and EMI features | Requires external feedback resistors; suited for multi-rail systems needing flexibility | Select when output voltage must be reconfigured post-design or multiple VOUTs share same PCB layout |
| LMQ62440CPPQRJRRQ1 | Fixed 5-V output; identical thermal, EMI, and functional specs except VOUT trim | Optimized for USB host, Ethernet PHY, or 5-V MCU rails instead of 3.3-V logic | Choose for 5-V applications where LMQ62440BPPQRJRRQ1's 3.3-V output is incompatible |
Compared with LMQ62440APPQRJRRQ1 and LMQ62440CPPQRJRRQ1, the LMQ62440BPPQRJRRQ1 offers optimal integration for 3.3-V automotive logic rails - eliminating feedback components while retaining full EMI, thermal, and functional safety capability of the family.
Availability
LMQ62440BPPQRJRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, digital instrument clusters, and body control units requiring stable component supply with AEC-Q100 traceability and long-term production support.
Supply support for LMQ62440BPPQRJRRQ1 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 LMQ62440-Q1 product line was developed specifically to address ultra-low EMI, high-temperature, and functional safety requirements in next-generation automotive electronics - targeting infotainment, ADAS, and domain controllers.
FAQ
What is the output voltage setting of the LMQ62440BPPQRJRRQ1?
The LMQ62440BPPQRJRRQ1 is factory-trimmed to deliver a fixed 3.3-V output with ±1.3% accuracy over temperature and line conditions. Unlike adjustable variants, it does not require external feedback resistors - the FB pin is internally terminated, simplifying layout and reducing BOM count for dedicated 3.3-V rails in automotive clusters and infotainment systems.
Does the LMQ62440BPPQRJRRQ1 support spread-spectrum modulation?
Yes, the LMQ62440BPPQRJRRQ1 supports pseudo-random spread-spectrum modulation to reduce peak EMI emissions. Spread-spectrum operation is enabled or disabled via the MODE/SYNC pin using a resistor divider, and it functions across the full 200 kHz–2.2 MHz switching frequency range. This feature contributes directly to CISPR-25 Class 5 compliance without external filtering.
What package type and thermal characteristics does the LMQ62440BPPQRJRRQ1 use?
The LMQ62440BPPQRJRRQ1 uses a 14-pin VQFN-HR (RJR) package measuring 4.00 mm × 3.50 mm with wettable flanks. Its thermal resistance is RθJA = 59°C/W (JEDEC 4-layer board), RθJB = 19.2°C/W, and RθJC(top) = 19°C/W. The dual PGND pins and exposed thermal pad support reliable operation up to +150°C junction temperature in automotive under-hood applications.
Can the LMQ62440BPPQRJRRQ1 withstand automotive load dump events?
Yes, the LMQ62440BPPQRJRRQ1 is rated for 42-V input transients per ISO 7637-2 and can sustain 42-V load dump events for up to 400 ms without damage or latch-up. This eliminates the need for external TVS diodes in many automotive front-end power designs, reducing system cost and board area while maintaining AEC-Q100 Grade 1 reliability.
How does the LMQ62440BPPQRJRRQ1 manage EMI in sensitive automotive environments?
The LMQ62440BPPQRJRRQ1 integrates six EMI-reduction techniques: (1) HotRod™ package minimizing switch-node ringing, (2) internal bypass capacitors, (3) parallel VIN1/VIN2 paths lowering parasitic inductance, (4) pseudo-random spread spectrum, (5) adjustable SW node rise time via RBOOT pin, and (6) optimized pinout for compact, low-loop-area layouts - collectively enabling CISPR-25 Class 5 compliance without external filters.
LMQ62440BPPQRJRRQ1 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 4A
- Frequency - Switching:
- 2.1MHz
- 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)
LMQ62440BPPQRJRRQ1 FAQ
1.How can I place an order for LMQ62440BPPQRJRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMQ62440BPPQRJRRQ1 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 LMQ62440BPPQRJRRQ1 reliable?
The price and inventory of LMQ62440BPPQRJRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMQ62440BPPQRJRRQ1 is usually 5 days.
3.What payment methods are accepted for LMQ62440BPPQRJRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMQ62440BPPQRJRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMQ62440BPPQRJRRQ1?
LMQ62440BPPQRJRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMQ62440BPPQRJRRQ1 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 LMQ62440BPPQRJRRQ1?
For technical support, including LMQ62440BPPQRJRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMQ62440BPPQRJRRQ1 requirements.
6.How does Aetrix verify that LMQ62440BPPQRJRRQ1 is sourced from the original manufacturer or authorized distributors?
All LMQ62440BPPQRJRRQ1 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 LMQ62440BPPQRJRRQ1 meets industry standards.
7.What is the process for return or replacement of LMQ62440BPPQRJRRQ1?
All LMQ62440BPPQRJRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMQ62440BPPQRJRRQ1, 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 LMQ62440BPPQRJRRQ1 part is unused and in its original packaging.
Return procedure for LMQ62440BPPQRJRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMQ62440BPPQRJRRQ1 Tags
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