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Texas Instruments LMQ62440CPPQRJRRQ1
- Part No.:
- LMQ62440CPPQRJRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
LMQ62440CPPQRJRRQ1.pdf
- Description:
- IC REG BUCK 5V 4A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,575
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Product details
Overview
LMQ62440CPPQRJRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 4 A at 5 V output from 3–36 V input, featuring integrated high-side (41 mΩ) and low-side (21 mΩ) MOSFETs, 2.1 MHz fixed switching frequency, and ultra-low EMI design compliant with CISPR 25 Class 5 for infotainment power rails.
For engineers reviewing the LMQ62440CPPQRJRRQ1 datasheet, LMQ62440CPPQRJRRQ1 pinout, LMQ62440CPPQRJRRQ1 application, or LMQ62440CPPQRJRRQ1 equivalent, key selection criteria include its 42-V load dump tolerance, 7 µA no-load quiescent current, adjustable SW node rise time via RBOOT, spread spectrum capability, and VQFN-HR 14-pin wettable flank package optimized for thermal and EMI performance in space-constrained automotive modules.
Technical Context
The LMQ62440CPPQRJRRQ1 implements a pseudo-random spread-spectrum modulator synchronized to its 2.1 MHz nominal switching frequency, reducing peak EMI emissions while maintaining tight regulation. Its dual-input VIN1/VIN2 architecture with parallel bypass paths minimizes parasitic inductance, and internal boot capacitor charging via CBOOT–SW–VCC path enables robust high-side gate drive.
Auto-mode operation enables seamless PWM-to-PFM transition with frequency foldback below 1 mA load, achieving 90% efficiency at 1 mA and 7 µA quiescent current. The device supports external bias (BIAS pin) for improved light-load efficiency and includes soft-recovery-from-dropout to prevent output overshoot during line transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 36 V; supports 42-V load dump for 400 ms - enables direct battery connection in automotive systems without pre-regulation. |
| Output Voltage | Fixed 5 V ±1.25% (typical accuracy); factory-trimmed - eliminates external feedback resistor network and improves production consistency. |
| Max Output Current | 4 A continuous; derated above 125°C junction - delivers full rated power in compact 4.0 mm × 3.5 mm VQFN-HR package with wettable flanks. |
| Switching Frequency | 2.1 MHz (fixed); synchronizable from 200 kHz to 2.2 MHz - allows noise avoidance in AM/FM/RF-sensitive zones and enables small external magnetics. |
| Quiescent Current | 7 µA (typical, no load, 13.5 VIN, 3.3 VOUT); 10 µA at 5 VOUT - extends battery life in always-on automotive modules such as telematics and ADAS sensors. |
| EMI Performance | CISPR 25 Class 5 compliant; achieved via integrated bypass capacitors, HotRod™-optimized pinout, adjustable SW rise time, and spread spectrum - reduces need for external EMI filters in head unit and display power supplies. |
| RDS(ON) | HS = 41 mΩ, LS = 21 mΩ (typical at 25°C); low conduction loss enables >93% efficiency at 4 A/5 V - minimizes thermal stress in sealed enclosures. |
Pinout & Package
The LMQ62440CPPQRJRRQ1 is housed in a 14-pin VQFN-HR (RJR) package measuring 4.00 mm × 3.50 mm with wettable flanks for automated optical inspection (AOI) and enhanced solder joint reliability in automotive reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (Pin 1) | External bias supply input | Connects to regulated output to improve light-load efficiency; optional 0.1–1 µF decoupling to AGND enhances noise immunity. |
| VCC (Pin 2) | Internal LDO output | Supplies internal control circuitry; requires 1 µF capacitor to AGND - not for external loading. |
| AGND (Pin 3) | Analog ground reference | Reference point for FB, VCC, and internal error amplifier; must be tied to both PGND1 and PGND2 on PCB for stability. |
| FB (Pin 4) | Feedback voltage input | Internally connected to 5 V reference; unused in fixed-output version - must not be floated or shorted. |
| PGOOD (Pin 5) | Open-drain power-good indicator | Signals regulation status (high = OK); pull-up required; asserts low during EN deactivation or fault conditions. |
| MODE/SYNC (Pin 6) | Operating mode and clock sync input | Selects Auto/FPWM mode or external synchronization; controls spread spectrum enable/disable via voltage/resistor thresholds. |
| EN (Pin 7) | Precision enable input | Active-high logic; 1.263 V threshold with 24–32% hysteresis - supports adjustable UVLO for system-level brownout protection. |
| VIN1 & VIN2 (Pins 8, 12) | Dual input power rails | Parallel high-current inputs reduce trace inductance; each requires local high-quality bypass capacitor to respective PGND. |
| PGND1 & PGND2 (Pins 9, 11) | Power ground return paths | Separate low-side MOSFET source returns; low-impedance tie to system ground and mutual connection essential for EMI control. |
| SW (Pin 10) | Switch node output | Drives external inductor; connects to CBOOT via 100 nF capacitor - critical path for minimizing ringing and EMI. |
| RBOOT (Pin 13) | SW rise-time adjustment | Resistor between RBOOT and CBOOT sets SW node slew rate (2.15 ns to 2.7 ns); fine-tunes EMI vs. efficiency trade-off. |
| CBOOT (Pin 14) | High-side gate driver supply | Charged via internal diode from VCC when SW is low; 100 nF capacitor to SW ensures robust bootstrap operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Rated for –40°C to +150°C junction temperature - validated for under-hood and infotainment applications without derating. |
| Integrated bypass capacitors | Reduces external component count and PCB area; eliminates discrete input caps while maintaining low impedance across frequency range. |
| Adjustable SW node rise time | Configurable via RBOOT resistor (0 Ω to open) - enables tuning of EMI profile without changing layout or magnetics. |
| Soft recovery from dropout | Prevents output voltage overshoot during line transients - protects downstream 5 V logic and interface ICs in cluster displays. |
| External bias support (BIAS pin) | Improves light-load efficiency by powering internal LDO from regulated output - extends battery runtime in always-on ADAS modules. |
Applications
| Automotive Infotainment Head Unit | ADAS Camera Power Supply |
|---|---|
|
Use Scenario: Powers SoC, DDR memory, and audio codec in centralized head unit with strict EMI limits near AM/FM antennas. IC Role / Device Role / Timing Role: Primary 5 V intermediate rail converter; regulates from 12 V battery with fast transient response to handle burst processing loads. Use Value: CISPR 25 Class 5 compliance eliminates need for ferrite beads or shielded inductors, reducing BOM cost and board area by ≥30%. |
Use Scenario: Supplies image sensor and ISP in forward-facing camera module exposed to engine bay thermal cycling. IC Role / Device Role / Timing Role: High-efficiency 5 V buck regulator with 42-V load dump tolerance - sustains operation during alternator transients. Use Value: 7 µA quiescent current and Auto-mode PFM enable <10 µA system sleep current, meeting ISO 26262 ASIL-B standby requirements. |
| Automotive Digital Cluster Display | Body Control Module USB Charging |
|
Use Scenario: Powers TFT LCD backlight driver and microcontroller in digital instrument cluster requiring stable 5 V at –40°C to +105°C ambient. IC Role / Device Role / Timing Role: Fixed-output buck converter with soft-start and PGOOD monitoring - ensures clean power-up sequencing for display initialization. Use Value: VQFN-HR wettable flanks enable 100% AOI coverage and IPC-A-610 Class 3 solder joint reliability for safety-critical instrumentation. |
Use Scenario: Provides 5 V/2.4 A USB Type-A port in rear-seat entertainment or center console with shared 12 V input. IC Role / Device Role / Timing Role: High-current DC-DC stage upstream of USB PD controller - handles variable load from 0–2.4 A with minimal thermal rise. Use Value: 41 mΩ/21 mΩ RDS(ON) and 93% peak efficiency at 4 A reduce thermal pad area by 40% versus competitive 5 V buck solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ62440BPPQRJRRQ1 | Fixed 3.3 V output; identical pinout, package, and EMI features | Targets 3.3 V logic rails (e.g., MCU cores, FPGAs) instead of 5 V peripherals | Select when system requires 3.3 V main rail with same thermal/EMI profile and footprint. |
| LM62440QPWRQ1 | Same 36 V/4 A rating but uses standard VQFN (no wettable flanks); no integrated bypass caps | Lacks CISPR 25 Class 5 compliance; requires external input capacitors and larger layout area | Choose only if cost sensitivity outweighs EMI certification needs and AOI is not required. |
Compared with LMQ62440BPPQRJRRQ1, the LMQ62440CPPQRJRRQ1 provides tighter 5 V regulation for USB and display interfaces; compared with LM62440QPWRQ1, it delivers certified low-EMI operation and reduced bill-of-materials through integrated bypass capacitance and wettable flank packaging.
Availability
LMQ62440CPPQRJRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital cluster displays requiring stable component supply with AEC-Q100 qualification, long-term lifecycle assurance, and traceable sourcing.
Supply support for LMQ62440CPPQRJRRQ1 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 over 40 years of automotive qualification expertise and ISO/TS 16949-certified manufacturing.
The LMQ62440CPPQRJRRQ1 belongs to TI's LMQ62440-Q1 family of automotive buck converters designed specifically for ultra-low EMI, high-reliability power conversion in infotainment, ADAS, and body electronics - emphasizing AEC-Q100 Grade 1 operation, functional safety readiness, and production-ready layout optimization.
FAQ
What is the output voltage setting of the LMQ62440CPPQRJRRQ1?
The LMQ62440CPPQRJRRQ1 is a factory-trimmed fixed-output variant delivering 5 V ±1.25% typical accuracy across temperature and line conditions. Its internal feedback divider eliminates external resistor networks, ensuring consistent regulation without calibration. This 5 V output is optimized for USB peripherals, display logic, and automotive interface ICs requiring stable mid-rail voltage.
Does the LMQ62440CPPQRJRRQ1 support external synchronization?
Yes, the LMQ62440CPPQRJRRQ1 supports external clock synchronization via the MODE/SYNC pin (Pin 6), accepting input frequencies from 200 kHz to 2.2 MHz. Synchronization occurs on the rising edge of the external clock signal and maintains spread spectrum operation when enabled. This capability allows designers to avoid sensitive RF bands in infotainment systems while preserving EMI performance.
How does the LMQ62440CPPQRJRRQ1 achieve CISPR 25 Class 5 compliance?
The LMQ62440CPPQRJRRQ1 achieves CISPR 25 Class 5 compliance through multiple integrated techniques: pseudo-random spread spectrum modulation, on-die bypass capacitors, HotRod™-optimized VQFN-HR pinout that minimizes switch-node ringing, parallel VIN1/VIN2 input paths to reduce parasitic inductance, and adjustable SW node rise time via the RBOOT pin. These features collectively suppress peak emissions without requiring external EMI filters.
What is the purpose of the BIAS pin on the LMQ62440CPPQRJRRQ1?
The BIAS pin (Pin 1) on the LMQ62440CPPQRJRRQ1 accepts an external bias voltage - typically connected to the regulated 5 V output - to improve light-load efficiency by powering the internal LDO from a higher-voltage rail. When used, it reduces switching losses and enables the LMQ62440CPPQRJRRQ1 to maintain high PFM efficiency down to microamp loads, extending battery life in always-on automotive modules.
Is the LMQ62440CPPQRJRRQ1 pin-compatible with other members of the LMQ62440-Q1 family?
Yes, the LMQ62440CPPQRJRRQ1 shares identical pinout, package (VQFN-HR 14-pin), and footprint with all variants in the LMQ62440-Q1 family, including the 3.3 V LMQ62440BPPQRJRRQ1 and adjustable-output LMQ62440APPQRJRRQ1. This enables single PCB design reuse across multiple output voltage requirements while maintaining identical thermal, EMI, and layout characteristics.
LMQ62440CPPQRJRRQ1 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):
- 5V
- 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)
LMQ62440CPPQRJRRQ1 FAQ
1.How can I place an order for LMQ62440CPPQRJRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMQ62440CPPQRJRRQ1 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 LMQ62440CPPQRJRRQ1 reliable?
The price and inventory of LMQ62440CPPQRJRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMQ62440CPPQRJRRQ1 is usually 5 days.
3.What payment methods are accepted for LMQ62440CPPQRJRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMQ62440CPPQRJRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMQ62440CPPQRJRRQ1?
LMQ62440CPPQRJRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMQ62440CPPQRJRRQ1 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 LMQ62440CPPQRJRRQ1?
For technical support, including LMQ62440CPPQRJRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMQ62440CPPQRJRRQ1 requirements.
6.How does Aetrix verify that LMQ62440CPPQRJRRQ1 is sourced from the original manufacturer or authorized distributors?
All LMQ62440CPPQRJRRQ1 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 LMQ62440CPPQRJRRQ1 meets industry standards.
7.What is the process for return or replacement of LMQ62440CPPQRJRRQ1?
All LMQ62440CPPQRJRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMQ62440CPPQRJRRQ1, 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 LMQ62440CPPQRJRRQ1 part is unused and in its original packaging.
Return procedure for LMQ62440CPPQRJRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMQ62440CPPQRJRRQ1 Tags
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