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Texas Instruments LM63440AASQRYFRQ1
- Part No.:
- LM63440AASQRYFRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerTFQFN
- Datasheet:
-
LM63440AASQRYFRQ1.pdf
- Description:
- IC REG BUCK ADJ 4A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,681
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Product details
Overview
LM63440AASQRYFRQ1 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, 1% accurate adjustable output (1V to 95% VIN), and frequency programmability from 200kHz to 2.2MHz via RT pin or SYNC signal. It targets infotainment power rails in head units and display modules.
For engineers reviewing the LM63440AASQRYFRQ1 datasheet, LM63440AASQRYFRQ1 pinout, LM63440AASQRYFRQ1 application, or LM63440AASQRYFRQ1 equivalent, key selection criteria include its MINT 1 EMI mitigation architecture, 7µA no-load quiescent current, 0.6µA shutdown IQ, Enhanced HotRod QFN package with wettable flanks, and functional safety documentation support for ASIL-B system integration.
Technical Context
The LM63440AASQRYFRQ1 integrates high-side and low-side MOSFETs (RDS(on) = 41/21 mΩ typ) and implements soft recovery from dropout to prevent output overshoot. Its MINT 1 architecture combines spread-spectrum modulation, symmetrical pinout, parallel input paths, and a low-EMI switch-node layout to meet stringent automotive CISPR 25 Class 5 requirements.
It supports dual operating modes: AUTO (PFM/PWM seamless transition) for ultra-low light-load IQ, and FPWM (forced PWM) enabled via EN/SYNC synchronization or configuration pin. The BIAS pin allows external biasing for improved efficiency at high VIN/low VOUT ratios, while PGOOD provides open-drain fault signaling with 92–110% output voltage window hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V; withstands 42V load-dump transients - enables direct battery connection in 12V/24V automotive systems |
| Output Current | 4A continuous - sufficient for powering SoC cores, FPGAs, or multi-rail PMICs in ADAS domain controllers |
| Output Voltage Accuracy | ±1% over temperature - ensures stable regulation for sensitive analog and digital loads without external trimming |
| Switching Frequency | 200kHz to 2.2MHz, adjustable via RT resistor or SYNC signal - allows EMI band avoidance and size/efficiency trade-off optimization |
| No-Load Quiescent Current | 7µA typical - extends battery runtime in always-on vehicle modules such as telematics or remote keyless entry receivers |
| Shutdown Current | 0.6µA typical - meets ultra-low-power requirements for sleep-mode compliance in ISO 16750-2 cold-cranking scenarios |
| Junction Temperature Limit | 150°C max - supports operation in under-hood environments with minimal derating at +125°C ambient |
Pinout & Package
LM63440AASQRYFRQ1 uses a 22-pin Enhanced HotRod™ QFN (RYF) package with wettable flanks for automated optical inspection and optimized thermal performance (RθJB = 8.8°C/W). The pinout features NC pins between high-voltage (VIN, SW, CBOOT) and low-voltage (PGND, FB, GND) terminals to improve FMEA robustness against adjacent-pin shorts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/SYNC | Enable and synchronization input | Active-high enable with precision UVLO; accepts external clock edges for FPWM mode and EMI synchronization |
| FB | Feedback input | Connects to resistive divider for adjustable output; 1V reference enables precise VOUT setting from 1V to 95% VIN |
| RT | Frequency programming | Resistor-to-GND sets switching frequency from 200kHz to 2.2MHz; enables dynamic frequency tuning during development |
| BIAS | Internal LDO bias input | Connects to VOUT to reduce power loss in high-input/low-output applications; improves full-load efficiency by ~1–2% |
| PGOOD | Power-good status output | Open-drain signal with 92–110% VOUT window; asserts after soft-start completion and deasserts on fault or EN disable |
| VIN1 / VIN2 | Main input supply | Dual VIN pins reduce parasitic inductance; require separate high-frequency bypass capacitors to respective PGND pins |
| PGND1 / PGND2 | Power ground return | Separated ground paths minimize noise coupling between high-side and low-side MOSFETs; must be tied together at single point near IC |
| SW1–SW4 | Switch node connections | Four SW pins distribute current and reduce trace inductance; SW4 connects to bootstrap capacitor, others to inductor |
Key Features
| Feature | Design Value |
|---|---|
| MINT 1 EMI Mitigation | Combines spread-spectrum modulation, symmetrical pinout, parallel input paths, and Enhanced HotRod packaging to reduce peak radiated emissions by >10dB vs. standard QFN |
| Soft Recovery from Dropout | Prevents output voltage overshoot during line transients or cold-crank events - eliminates need for external clamping circuits |
| Wettable Flank QFN | Enables 100% automated visual solder-joint inspection - critical for zero-defect manufacturing in automotive Tier-1 production |
| Functional Safety Documentation | Includes FIT rate data, failure mode analysis, and diagnostic coverage reports - accelerates ISO 26262 ASIL-B hardware integration |
| Thermal Robustness | 150°C max junction temperature with thermal shutdown at 168°C ±10°C - supports operation in high-ambient under-dash locations |
Applications
| Infotainment Head Unit Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC, DDR memory, and display interface in automotive head units requiring clean, low-noise 1.1V/1.8V/3.3V rails. IC Role / Device Role / Timing Role: Primary buck regulator delivering 4A at 3.3V with <1% output ripple and <2mV P-P noise under dynamic load. Use Value: MINT 1 architecture ensures CISPR 25 Class 5 compliance without added ferrite beads or shielding, reducing BOM cost by $0.35/unit. | Use Scenario: Supplies image sensor, ISP, and serializer in rear-view or surround-view camera modules exposed to engine bay temperatures. IC Role / Device Role / Timing Role: High-efficiency 5V-to-1.2V intermediate stage enabling >90% efficiency at 100mA–2A load range across –40°C to +105°C. Use Value: 7µA no-load IQ and 0.6µA shutdown current extend battery backup time to >72 hours during vehicle sleep mode. |
| Automotive USB-C Charging Port | Body Control Module (BCM) Core Supply |
Use Scenario: Generates 5V/3A USB PD output from 12V battery using secondary buck-boost stage; LM63440AASQRYFRQ1 supplies controller and gate drivers. IC Role / Device Role / Timing Role: Auxiliary 3.3V rail for USB-C controller, level shifters, and protection ICs with fast transient response (<10µs recovery). Use Value: 2.2MHz max switching frequency allows use of 1.0µH inductors, shrinking total solution size by 35% vs. 400kHz alternatives. | Use Scenario: Provides regulated 3.3V core supply for microcontroller, CAN transceivers, and LIN interfaces in door modules or seat controllers. IC Role / Device Role / Timing Role: Primary 4A buck converter with integrated current limiting and thermal shutdown for fault-tolerant operation. Use Value: Dual PGND/VIN pins and NC-guarded layout reduce risk of short-to-adjacent-pin failures, improving FMEA score by 22% per ISO 26262 Annex D. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM63440AFSQRYFRQ1 | Same 4A RYF package but configured for FPWM-only light-load operation (no PFM/AUTO mode) | Suitable where deterministic switching frequency is required for EMI filtering or clock synchronization | Select when system-level timing constraints mandate fixed-frequency operation regardless of load |
| LM64440BPPQRYFRQ1 | Fixed 3.3V output, pin-selectable spread spectrum, 2.1MHz fixed frequency, same 4A rating and RYF package | Optimized for cost-sensitive applications needing no feedback divider or frequency programming components | Choose for simplified BOM and faster qualification where 3.3V output suffices and spread-spectrum control is acceptable |
Compared with LM63440AFSQRYFRQ1, the LM63440AASQRYFRQ1 offers superior light-load efficiency via AUTO mode, while LM64440BPPQRYFRQ1 trades configurability for reduced component count and guaranteed EMI performance at fixed 2.1MHz - making each optimal for distinct automotive subsystem priorities.
Availability
LM63440AASQRYFRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body electronics requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM63440AASQRYFRQ1 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 LM634x0-Q1 product line delivers high-efficiency, low-EMI synchronous buck converters engineered specifically for ASIL-B automotive subsystems including infotainment, ADAS, and body electronics - emphasizing reliability, thermal robustness, and EMI compliance.
FAQ
What is the maximum input voltage the LM63440AASQRYFRQ1 can withstand during load-dump events?
The LM63440AASQRYFRQ1 supports up to 42V input voltage during load-dump transients, as specified in its Absolute Maximum Ratings table. This capability allows direct connection to 12V and 24V automotive battery systems without external TVS protection in most cases. The device maintains regulation down to 3V input, enabling operation during cold-crank conditions. Its internal circuitry is designed to survive these transients without latch-up or parametric shift, provided layout guidelines for input capacitance and grounding are followed per the datasheet Section 8.4.
Does the LM63440AASQRYFRQ1 support spread-spectrum frequency modulation, and how is it enabled?
Yes, the LM63440AASQRYFRQ1 implements spread-spectrum frequency modulation (SSFM) as part of its MINT 1 EMI mitigation architecture. SSFM is enabled by default in the LM63440AASQRYFRQ1 variant - no external configuration is required. The spread spectrum operates with a ±2% frequency deviation around the center frequency set by the RT resistor or SYNC signal, and a pattern frequency of 1.5Hz at 2.1MHz nominal switching. This reduces peak radiated emissions without affecting regulation accuracy or transient response, and remains active in both AUTO and FPWM modes.
What is the purpose of the BIAS pin on the LM63440AASQRYFRQ1, and how should it be connected?
The BIAS pin on the LM63440AASQRYFRQ1 supplies the internal LDO that powers control circuitry. Connecting BIAS to the output voltage (VOUT) reduces power dissipation in the internal LDO, improving full-load efficiency by approximately 1–2% - especially beneficial in high-VIN/low-VOUT applications like 12V-to-3.3V conversion. If VOUT exceeds 12V, BIAS must be connected to GND. An optional 0.1µF–1µF capacitor from BIAS to GND enhances noise immunity. Leaving BIAS floating is not permitted and may cause unstable operation.
How does the LM63440AASQRYFRQ1 handle light-load efficiency, and what are the available modes?
The LM63440AASQRYFRQ1 supports two light-load operating modes: AUTO (default) and FPWM. In AUTO mode, it automatically transitions between PFM (pulse-frequency modulation) at very light loads - achieving 7µA typical no-load IQ - and PWM at higher loads for seamless efficiency across the full 0–4A range. FPWM mode forces continuous switching regardless of load, eliminating frequency foldback and ensuring deterministic EMI behavior. FPWM is activated either by applying a SYNC signal to EN/SYNC or by selecting the LM63440AFSQRYFRQ1 variant; the LM63440AASQRYFRQ1 supports both via configuration.
Is the LM63440AASQRYFRQ1 pin-compatible with other devices in the LM634x0-Q1 family, and what package does it use?
Yes, the LM63440AASQRYFRQ1 uses the same 22-pin Enhanced HotRod™ QFN (RYF) package as LM63460-Q1 and LM64440-Q1 variants, ensuring mechanical and solder-layout compatibility. All RYF-packaged LM634x0-Q1 devices share identical pinout, footprint, and thermal pad dimensions - enabling drop-in replacement between 4A and 6A versions where board layout and thermal design accommodate the higher current. However, current-limit thresholds, RDS(on), and certain timing parameters differ; electrical validation is required before substitution in production designs.
LM63440AASQRYFRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LM634x0-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:
- 200kHz ~ 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)
LM63440AASQRYFRQ1 FAQ
1.How can I place an order for LM63440AASQRYFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM63440AASQRYFRQ1 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 LM63440AASQRYFRQ1 reliable?
The price and inventory of LM63440AASQRYFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM63440AASQRYFRQ1 is usually 5 days.
3.What payment methods are accepted for LM63440AASQRYFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM63440AASQRYFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM63440AASQRYFRQ1?
LM63440AASQRYFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM63440AASQRYFRQ1 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 LM63440AASQRYFRQ1?
For technical support, including LM63440AASQRYFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM63440AASQRYFRQ1 requirements.
6.How does Aetrix verify that LM63440AASQRYFRQ1 is sourced from the original manufacturer or authorized distributors?
All LM63440AASQRYFRQ1 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 LM63440AASQRYFRQ1 meets industry standards.
7.What is the process for return or replacement of LM63440AASQRYFRQ1?
All LM63440AASQRYFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM63440AASQRYFRQ1, 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 LM63440AASQRYFRQ1 part is unused and in its original packaging.
Return procedure for LM63440AASQRYFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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