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Texas Instruments LM64440BPPQRYFRQ1
- Part No.:
- LM64440BPPQRYFRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerTFQFN
- Datasheet:
-
LM64440BPPQRYFRQ1.pdf
- Description:
- IC REG BUCK 3.3V 4A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,898
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Product details
Overview
LM64440BPPQRYFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC/DC converter delivering 4A output at fixed 3.3V, operating from 3V to 36V input with 42V load-dump tolerance, 2.1MHz switching frequency, and integrated high- and low-side MOSFETs for infotainment power rails.
For engineers reviewing the LM64440BPPQRYFRQ1 datasheet, LM64440BPPQRYFRQ1 pinout, LM64440BPPQRYFRQ1 application, or LM64440BPPQRYFRQ1 equivalent, key selection criteria include its pin-selectable light-load mode (PFM/AUTO/FPWM), MINT 1 EMI mitigation architecture, wettable-flank 22-pin Enhanced HotRod™ QFN package, and functional safety documentation support.
Technical Context
This device implements a current-mode control architecture with soft-recovery-from-dropout to prevent output overshoot, and integrates dual input paths (VIN1/VIN2) with parallel routing to minimize parasitic inductance. Its MODE/SYNC pin supports three operational modes-AUTO (frequency foldback), FPWM (fixed-frequency PWM), or external clock synchronization-and enables pin-configurable spread-spectrum modulation.
The thermal design leverages an exposed thermal pad (GND) with low RθJB (8.8°C/W) and optimized pin spacing between high-voltage (SW, VIN, CBOOT) and low-voltage pins (PGND, FB, PGOOD) to improve FMEA compliance in short-to-adjacent-pin failure scenarios. The BIAS pin allows external biasing to enhance efficiency when VOUT exceeds 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V continuous, with 42V transient tolerance for automotive load-dump events |
| Output Current | 4A continuous DC output with internal current limiting (7A typical high-side limit) |
| Output Voltage | Fixed 3.3V ±1% accuracy over temperature and line/load conditions |
| Switching Frequency | 2.1MHz nominal (adjustable 200kHz–2.2MHz via SYNC), enabling compact magnetics |
| Quiescent Current | 7µA typical in AUTO mode at no load, supporting always-on automotive systems |
| Junction Temperature | Rated for –40°C to +150°C operation, with thermal shutdown at 168°C (±10°C hysteresis) |
| Package | 22-pin Enhanced HotRod™ VQFN-FCRLF (RYF) with wettable flanks for automated optical inspection |
Pinout & Package
LM64440BPPQRYFRQ1 uses a 22-pin Enhanced HotRod™ VQFN-FCRLF (RYF) package with wettable flanks and exposed thermal pad (GND). Pin spacing is optimized for automotive FMEA compliance, including NC pins isolating high-voltage nodes (VIN, SW, CBOOT) from sensitive signals (FB, PGOOD).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD | Open-drain status indicator | Signals regulation status; pulled high externally; asserts low on fault or EN deactivation |
| EN | Enable/UVLO control input | Active-high enable with precision threshold (1.263V) and hysteresis (28%) for robust start-up |
| MODE/SYNC | Mode selection & clock sync | Configures PFM/AUTO/FPWM operation and enables external clock synchronization or spread-spectrum modulation |
| VIN1, VIN2 | Dual input power rails | Parallel high-current inputs reduce loop inductance; require separate high-quality bypass capacitors to PGND1/PGND2 |
| SW1–SW4 | Switch node terminals | Four dedicated switch-node connections distribute current and reduce localized heating and EMI |
| PGND1, PGND2 | Power ground returns | Separated ground paths for high-side and low-side MOSFETs; must be low-impedance and tied together at single point |
| FB | Feedback reference input | Connects directly to output for fixed 3.3V version; internal 1% accurate reference eliminates external resistor divider |
| BIAS | Efficiency-boosting LDO input | Accepts VOUT to power internal circuitry, reducing VIN current draw and improving light-load efficiency |
Key Features
| Feature | Design Value |
|---|---|
| MINT 1 EMI Mitigation | Combines spread-spectrum modulation, symmetrical pinout, and Enhanced HotRod™ package to suppress switch-node ringing and meet CISPR 25 Class 5 |
| Pin-Selectable Light-Load Mode | Three distinct modes (AUTO, FPWM, SYNC) configured via MODE/SYNC resistor network-no firmware or external controller required |
| FMEA-Optimized Pinout | NC pins placed between VIN/SW/CBOOT and adjacent low-voltage pins to maintain regulated output during pin-to-pin short faults |
| Soft Recovery from Dropout | Prevents output voltage overshoot during input recovery by controlling duty cycle ramp-up without requiring external compensation |
| Wettable Flank Packaging | Enables 100% automated visual inspection of solder joints on all 22 perimeter pins, reducing post-assembly defect escape |
Applications
| Automotive Infotainment Head Unit Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC, display interface, and USB-C PD controllers in vehicle head units requiring stable 3.3V rail under cold-crank (3V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary 4A buck regulator providing main logic supply; operates in AUTO mode to minimize standby current during display-off states. Use Value: 7µA no-load IQ extends battery life during key-off; MINT 1 ensures clean power delivery without interfering with AM/FM radio reception. | Use Scenario: Supplies image sensor, ISP, and serializer in front/rear-view camera modules where EMI sensitivity prohibits conventional switching regulators. IC Role / Device Role / Timing Role: Fixed 3.3V buck converter operating in FPWM mode to eliminate frequency modulation artifacts in video timing signals. Use Value: Enhanced HotRod™ package and symmetrical layout reduce radiated emissions below CISPR 25 limits without added shielding or ferrites. |
| Body Control Module Core Logic Rail | Automotive USB Charging Port |
Use Scenario: Delivers 3.3V to microcontroller, CAN transceiver, and LIN interface in body control units exposed to wide ambient temperature swings (–40°C to +125°C). IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 power stage with thermal shutdown (168°C) and 150°C max junction rating for under-hood placement. Use Value: Dual VIN inputs and separated PGND paths ensure stable regulation despite PCB trace impedance variations across large chassis-mounted boards. | Use Scenario: Provides regulated 3.3V auxiliary power to USB Type-A/B port controllers and data-line level shifters in center console charging hubs. IC Role / Device Role / Timing Role: Secondary buck stage downstream of primary 5V/12V converters; uses BIAS pin connected to 5V rail to improve conversion efficiency above 90%. Use Value: External bias option reduces input current by ~30% at 4A load versus VIN-only operation, lowering thermal stress in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM64440CPPQRYFRQ1 | Same package and pinout; fixed 5V output instead of 3.3V; identical current rating (4A), switching frequency (2.1MHz), and MINT 1 features | Used where system requires 5V logic rail instead of 3.3V; no change to PCB layout or thermal design | Select when target output voltage is 5V and same automotive qualification, efficiency, and EMI performance are required |
| LM63440AFSQRYFRQ1 | 4A AEC-Q100 buck with fixed-frequency FPWM-only operation; no AUTO mode or spread spectrum; lower IQ (12µA vs 7µA); same RYF package | Suitable for noise-immune but non-EMI-sensitive applications where deterministic timing is prioritized over ultra-low standby power | Choose when strict frequency stability is mandatory and 5µA lower no-load current is not needed |
Compared with LM64440CPPQRYFRQ1, the LM64440BPPQRYFRQ1 provides tighter output regulation for 3.3V logic domains; compared with LM63440AFSQRYFRQ1, it delivers superior EMI performance and 43% lower no-load current, critical for always-on automotive subsystems.
Availability
LM64440BPPQRYFRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control unit designs requiring stable component supply with full AEC-Q100 Grade 1 qualification and long-term production support.
Supply support for LM64440BPPQRYFRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive power management ICs and functional safety solutions.
The LM644x0-Q1 product line delivers high-efficiency, low-quiescent-current synchronous buck converters engineered specifically for automotive subsystems requiring AEC-Q100 qualification, EMI robustness, and FMEA-aware packaging.
FAQ
What is the maximum input voltage the LM64440BPPQRYFRQ1 can withstand during automotive load-dump events?
The LM64440BPPQRYFRQ1 supports up to 42V input voltage for transient load-dump conditions while maintaining safe operation, per AEC-Q100 stress testing requirements. This rating is validated across the full –40°C to +125°C ambient temperature range and applies to both VIN1 and VIN2 pins simultaneously. The device remains functional without latch-up or parametric shift during these events, provided proper input capacitance and layout guidelines are followed.
Does the LM64440BPPQRYFRQ1 require an external feedback resistor divider for its 3.3V output?
No, the LM64440BPPQRYFRQ1 does not require an external feedback resistor divider because it is a factory-trimmed fixed-output variant. The internal reference and feedback network are laser-trimmed to deliver 3.3V ±1% accuracy across temperature, line, and load conditions. The FB pin is internally connected and must be left unconnected externally-adding external resistors would disrupt regulation and void the specified accuracy.
How does the BIAS pin improve efficiency in the LM64440BPPQRYFRQ1?
The BIAS pin in the LM64440BPPQRYFRQ1 accepts an external voltage (typically VOUT or a higher rail like 5V) to power the internal LDO and control circuitry, reducing current drawn from VIN. When biased with 5V, the device achieves up to 30% lower input current at 4A load versus VIN-only operation, directly improving full-load efficiency and reducing thermal dissipation in the input path.
Can the LM64440BPPQRYFRQ1 be synchronized to an external clock, and what is the valid frequency range?
Yes, the LM64440BPPQRYFRQ1 supports external clock synchronization via the MODE/SYNC pin, accepting TTL- or CMOS-compatible signals with valid high/low durations ≥8µs. The synchronization frequency range is 200kHz to 2.2MHz, allowing alignment with system clocks or avoidance of sensitive RF bands. Synchronization overrides internal oscillator operation and maintains tight duty-cycle control without phase jitter accumulation.
What thermal performance metrics are specified for the LM64440BPPQRYFRQ1 in its RYF package?
The LM64440BPPQRYFRQ1 in the 22-pin Enhanced HotRod™ RYF package has a measured junction-to-board thermal resistance (RθJB) of 8.8°C/W on a standard 4-layer JEDEC board, and a junction-to-case (bottom) resistance of 8.6°C/W. Its evaluation module achieves RθJA of 23.5°C/W-significantly better than the simulated 38.5°C/W-demonstrating effective heat transfer through the exposed thermal pad to the PCB ground plane.
LM64440BPPQRYFRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LM644x0-Q1
- Package/Case:
- 22-PowerTFQFN
- 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:
- 22-VQFN-HR (3.5x4)
LM64440BPPQRYFRQ1 FAQ
1.How can I place an order for LM64440BPPQRYFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM64440BPPQRYFRQ1 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 LM64440BPPQRYFRQ1 reliable?
The price and inventory of LM64440BPPQRYFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM64440BPPQRYFRQ1 is usually 5 days.
3.What payment methods are accepted for LM64440BPPQRYFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM64440BPPQRYFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM64440BPPQRYFRQ1?
LM64440BPPQRYFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM64440BPPQRYFRQ1 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 LM64440BPPQRYFRQ1?
For technical support, including LM64440BPPQRYFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM64440BPPQRYFRQ1 requirements.
6.How does Aetrix verify that LM64440BPPQRYFRQ1 is sourced from the original manufacturer or authorized distributors?
All LM64440BPPQRYFRQ1 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 LM64440BPPQRYFRQ1 meets industry standards.
7.What is the process for return or replacement of LM64440BPPQRYFRQ1?
All LM64440BPPQRYFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM64440BPPQRYFRQ1, 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 LM64440BPPQRYFRQ1 part is unused and in its original packaging.
Return procedure for LM64440BPPQRYFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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