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Texas Instruments LM64440APPQRYFRQ1
- Part No.:
- LM64440APPQRYFRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerTFQFN
- Datasheet:
-
LM64440APPQRYFRQ1.pdf
- Description:
- IC REG BUCK ADJ 4A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,446
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Product details
Overview
LM64440APPQRYFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC/DC converter delivering up to 4A output current, supporting 3V–36V input with 42V load-dump tolerance, fixed 2.1MHz switching frequency (adjustable 200kHz–2.2MHz), 1% accurate adjustable output (1V to 95% VIN), and MINT 1 noise-mitigation architecture. It serves as primary power supply for ADAS camera modules requiring low EMI and high reliability.
For engineers reviewing the LM64440APPQRYFRQ1 datasheet, LM64440APPQRYFRQ1 pinout, LM64440APPQRYFRQ1 application, or LM64440APPQRYFRQ1 equivalent, key selection criteria include its pin-selectable light-load mode (PFM/AUTO/FPWM), spread-spectrum modulation capability, Enhanced HotRod™ QFN-22 package with wettable flanks, and integrated high-side/low-side MOSFETs with RDS(on) of 41mΩ/21mΩ.
Technical Context
The LM64440APPQRYFRQ1 implements a current-mode control architecture with soft-recovery-from-dropout to prevent output overshoot, and supports seamless PWM-to-PFM transition for ultra-low no-load IQ (7µA typical). Its MODE/SYNC pin enables configurable operation modes including external clock synchronization and pin-selectable spread-spectrum modulation.
MINT 1 architecture integrates parallel input paths, symmetrical pinout for optimal input capacitor placement, and switch-node ringing reduction via the Enhanced HotRod™ QFN package. The device features dual VIN pins (VIN1/VIN2) and dual PGND pins (PGND1/PGND2) with NC pins strategically placed between high-voltage and low-voltage terminals to improve FMEA robustness against adjacent-pin shorts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V continuous; withstands 42V load-dump transients - enables direct battery connection in 12V/24V automotive systems without pre-regulation. |
| Output Current | 4A continuous - sufficient for powering image signal processors (ISPs), radar SoCs, or multi-rail domain controllers in ADAS ECUs. |
| Switching Frequency | Fixed 2.1MHz (adjustable 200kHz–2.2MHz via SYNC) - allows compact magnetics and avoids AM/FM radio bands while maintaining high efficiency. |
| Output Voltage Accuracy | ±1% over temperature and line - ensures stable core voltage for sensitive vision processors without external trimming. |
| Quiescent Current | 7µA typical at no load (AUTO mode) - extends battery runtime during vehicle sleep modes per ISO 16750-2 requirements. |
| Thermal Limit | 150°C max junction temperature - supports operation in under-hood environments with minimal derating. |
| EMI Mitigation | MINT 1 architecture with pin-configurable spread spectrum and optimized HotRod™ layout - reduces peak radiated emissions by >10dB in CISPR 25 Class 5 testing. |
Pinout & Package
Package: 22-pin Enhanced HotRod™ VQFN-FCRLF (RYF) with wettable flanks and exposed thermal pad - enables automated optical inspection (AOI) and superior thermal performance (RθJB = 8.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1–SW4 | Switch node terminals | Four paralleled SW pins reduce current density and parasitic inductance; SW4 connects to bootstrap capacitor for high-side gate drive. |
| VIN1 / VIN2 | Input power inputs | Dual high-current VIN paths minimize IR drop and enable symmetric PCB routing for lower EMI. |
| PGND1 / PGND2 | Power ground returns | Separate low-impedance ground paths for each VIN pair improve current-loop control and reduce ground bounce. |
| MODE/SYNC | Mode selection & sync input | Configures PFM/PWM operation or accepts external clock; also controls spread-spectrum activation via resistor divider. |
| FB | Feedback input | Connects to resistive divider for adjustable output; internal 1V reference enables precise regulation from 1V to 95% VIN. |
| BIAS | Efficiency boost input | Accepts output voltage to bias internal LDO - improves light-load efficiency and reduces dropout voltage to 0.6V typical. |
| EN | Enable with UVLO | Precision enable threshold (1.263V) with 24–32% hysteresis - supports programmable input undervoltage lockout for system-level brownout protection. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets functional safety requirements for ASIL-B automotive subsystems. |
| MINT 1 noise mitigation | Combines spread-spectrum modulation, symmetrical pinout, and parallel input paths - achieves CISPR 25 Class 5 compliance without added filtering. |
| Enhanced HotRod™ QFN | Wettable-flank 22-pin package with NC pins isolating VIN/SW/CBOOT from low-voltage pins - improves FMEA score and enables AOI post-reflow. |
| Soft recovery from dropout | Prevents output overshoot during input transients - eliminates need for external clamping circuits in start-stop or cold-crank scenarios. |
| External BIAS input | Allows connection to regulated output rail - reduces internal LDO losses and maintains >91% efficiency at 100µA load (3.3V out). |
Applications
| ADAS Camera Power Supply | Radar Sensor Core Rail |
|---|---|
Use Scenario: Powers 5MP ISP and MIPI CSI-2 interface in front-facing driver assistance camera module. IC Role / Device Role / Timing Role: Primary 3.3V/4A buck regulator with tight transient response and low EMI to avoid interference with image sensor analog front-end. Use Value: MINT 1 architecture suppresses switching noise near 100MHz–1GHz where CMOS image sensors are most susceptible, enabling clean raw image capture. |
Use Scenario: Supplies 1.2V core voltage to 77GHz radar SoC with dynamic load steps up to 3A/µs. IC Role / Device Role / Timing Role: High-efficiency, fast-transient buck converter operating in FPWM mode to maintain regulation during RF transmit bursts. Use Value: 41mΩ/21mΩ RDS(on) MOSFETs and 2.1MHz switching minimize output impedance, reducing voltage droop to <40mV during 3A load steps. |
| Infotainment USB-C PD Sink | Body Control Module Auxiliary Rail |
Use Scenario: Generates 5V/3A for USB-C power delivery sink in head unit, supporting fast charging of mobile devices. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 5V with external feedback divider; uses BIAS pin to optimize efficiency across load range. Use Value: 93% efficiency at 5V/4A and 73% at 100µA enables thermally constrained PCB layouts while meeting USB-IF power budget limits. |
Use Scenario: Provides 3.3V/2A auxiliary rail for LIN gateway microcontroller and CAN transceiver in door module ECU. IC Role / Device Role / Timing Role: Robust buck regulator with load-dump immunity and precision enable for controlled power sequencing during wake-up events. Use Value: Withstands 42V transients and features 0.6µA shutdown current - satisfies ISO 16750-2 pulse 5a/b requirements and extends battery life in parked state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM64460APPQRYFRQ1 | 6A output current, identical pinout and feature set - higher current rating with same footprint and control interface. | Suitable for higher-power ADAS domains (e.g., surround-view SoCs) where 4A is insufficient. | Select when system load exceeds 4A or future-proofing for higher-performance variants is required; no PCB change needed. |
| LM63440AFSQRYFRQ1 | 4A output but fixed FPWM-only light-load mode; no pin-selectable spread spectrum; adjustable frequency only via SYNC. | Better suited for noise-insensitive industrial applications where deterministic timing outweighs EMI concerns. | Choose when strict timing predictability is mandatory and automotive EMI certification is not required; requires different MODE/SYNC configuration. |
Compared with LM64460APPQRYFRQ1, the LM64440APPQRYFRQ1 offers optimized thermal performance at lower current loads and reduced BOM cost; versus LM63440AFSQRYFRQ1, it provides superior EMI control and flexible light-load behavior essential for automotive infotainment and ADAS.
Availability
LM64440APPQRYFRQ1 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, radar sensor power supplies, and infotainment USB-C PD sinks requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM64440APPQRYFRQ1 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 decades of automotive-grade power management innovation.
The LM644x0-Q1 product line was designed specifically for demanding automotive power rails - emphasizing EMI robustness, functional safety readiness, and wide-input operation in engine bay and cabin environments.
FAQ
What is the maximum input voltage the LM64440APPQRYFRQ1 can withstand during load-dump events?
The LM64440APPQRYFRQ1 supports up to 42V on VIN1 and VIN2 pins during load-dump transients, as specified in its Absolute Maximum Ratings table. This rating complies with ISO 16750-2 Pulse 5a/b requirements for 12V automotive systems. Operation above 36V is limited to transient conditions only; sustained input must remain within 3V–36V for reliable regulation. The device's internal protection circuitry remains functional throughout this 42V event without latch-off or damage.
Does the LM64440APPQRYFRQ1 support adjustable output voltage, and what is the minimum achievable setting?
Yes, the LM64440APPQRYFRQ1 supports fully adjustable output voltage from 1V to 95% of VIN using an external resistor divider on the FB pin. The internal reference is 1.0V ±1%, enabling precise regulation down to 1V with appropriate feedback network design. For example, with VIN = 12V, the lowest stable output is 1V; with VIN = 36V, the upper limit is 34.2V. Fixed 3.3V and 5V factory-trimmed variants are also available under different orderable part numbers.
How does the BIAS pin improve efficiency in the LM64440APPQRYFRQ1?
The BIAS pin on the LM64440APPQRYFRQ1 accepts the regulated output voltage to power the internal LDO, reducing conduction losses associated with generating VCC from VIN. When BIAS is connected to VOUT (≤12V), typical efficiency increases by 2–3% at light loads and lowers dropout voltage to 0.6V at full load. This configuration also improves thermal performance by shifting power dissipation from the main regulator path to the output rail, making it especially valuable in thermally constrained ADAS camera modules.
What package type and thermal characteristics does the LM64440APPQRYFRQ1 use?
The LM64440APPQRYFRQ1 uses the 22-pin Enhanced HotRod™ VQFN-FCRLF (RYF) package with wettable flanks and an exposed thermal pad. Its thermal metrics include RθJB = 8.8°C/W (junction-to-board) and RθJA = 23.5°C/W on the TI evaluation module. The package incorporates NC pins between high-voltage (VIN, SW, CBOOT) and low-voltage (PGND, FB, EN) terminals to enhance FMEA robustness. Wettable flanks enable automated optical inspection of solder joints, critical for automotive manufacturing traceability.
Can the LM64440APPQRYFRQ1 be synchronized to an external clock, and what is the valid frequency range?
Yes, the LM64440APPQRYFRQ1 supports external clock synchronization via the MODE/SYNC pin, accepting rising-edge-triggered signals from 200kHz to 2.2MHz. This allows alignment with system clocks to avoid beat frequencies in multi-rail power systems or meet specific EMC test band requirements. The device maintains ±5% frequency accuracy during synchronization and retains all internal features - including spread-spectrum modulation (if enabled) and light-load mode selection - while locked to the external source.
LM64440APPQRYFRQ1 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:
- 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:
- 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)
LM64440APPQRYFRQ1 FAQ
1.How can I place an order for LM64440APPQRYFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM64440APPQRYFRQ1 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 LM64440APPQRYFRQ1 reliable?
The price and inventory of LM64440APPQRYFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM64440APPQRYFRQ1 is usually 5 days.
3.What payment methods are accepted for LM64440APPQRYFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM64440APPQRYFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM64440APPQRYFRQ1?
LM64440APPQRYFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM64440APPQRYFRQ1 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 LM64440APPQRYFRQ1?
For technical support, including LM64440APPQRYFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM64440APPQRYFRQ1 requirements.
6.How does Aetrix verify that LM64440APPQRYFRQ1 is sourced from the original manufacturer or authorized distributors?
All LM64440APPQRYFRQ1 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 LM64440APPQRYFRQ1 meets industry standards.
7.What is the process for return or replacement of LM64440APPQRYFRQ1?
All LM64440APPQRYFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM64440APPQRYFRQ1, 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 LM64440APPQRYFRQ1 part is unused and in its original packaging.
Return procedure for LM64440APPQRYFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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