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Texas Instruments LM63460AFSQRYFRQ1
- Part No.:
- LM63460AFSQRYFRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerTFQFN
- Datasheet:
-
LM63460AFSQRYFRQ1.pdf
- Description:
- IC REG BUCK ADJ 6A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,818
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Product details
Overview
LM63460AFSQRYFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC/DC converter delivering up to 6A output current, supporting 3V–36V input with 42V load-dump tolerance, 1% accurate adjustable output (1V to 95% VIN), FPWM light-load mode, and 200kHz–2.2MHz adjustable switching frequency - deployed in infotainment head units and ADAS power rails.
For engineers reviewing the LM63460AFSQRYFRQ1 datasheet, LM63460AFSQRYFRQ1 pinout, LM63460AFSQRYFRQ1 application, or LM63460AFSQRYFRQ1 equivalent, key selection criteria include its MINT 1 EMI mitigation architecture, Enhanced HotRod QFN package with wettable flanks, integrated high-side/low-side MOSFETs (RDS(on) = 41 mΩ / 21 mΩ), 7 µA no-load IQ, and functional safety documentation support.
Technical Context
The LM63460AFSQRYFRQ1 implements a fixed-frequency PWM controller with external RT/SYNC programmability and supports seamless transition between FPWM and PFM modes only when configured as AUTO (not applicable here - this variant is FPWM-only). Its MINT 1 architecture integrates spread-spectrum modulation, symmetrical input path layout, and low-ringing switch-node design via the Enhanced HotRod QFN package.
It features dual VIN inputs (VIN1/VIN2), four SW pins for optimized current sharing and thermal distribution, dedicated BIAS input for efficiency enhancement, and a precision enable/sync pin that disables PFM and forces FPWM operation when externally synchronized - all operating within –40°C to +125°C ambient temperature range per AEC-Q100 Grade 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V continuous; withstands 42V load-dump transients - enables direct battery connection without pre-regulator in 12V/24V automotive systems. |
| Output Current | 6A continuous DC output - sufficient for powering SoCs, FPGAs, or multi-rail PMICs in ADAS camera modules or cluster displays. |
| Switching Frequency | 200kHz to 2.2MHz, set by RT resistor or SYNC signal - allows EMI band avoidance and trade-off between inductor size and efficiency. |
| Feedback Accuracy | ±1% over –40°C to +125°C - ensures stable voltage regulation for sensitive analog and digital loads without external trimming. |
| Quiescent Current | 7µA typical at no-load (3.3VOUT), 0.6µA in shutdown - meets ultra-low-power requirements for always-on automotive domains. |
| Thermal Limit | 150°C max junction temperature, 158°C–180°C thermal shutdown threshold - supports high-ambient under-hood or dashboard deployments. |
| MOSFET RDS(on) | High-side: 41 mΩ typ, Low-side: 21 mΩ typ at 25°C - reduces conduction loss and improves full-load efficiency to 92.5% @ 5V/6A/2.1MHz. |
Pinout & Package
LM63460AFSQRYFRQ1 uses the RYF package: 22-pin Enhanced HotRod™ QFN with wettable flanks, 4.0mm × 4.0mm body, 0.5mm pitch, and exposed thermal pad. Designed for automotive reliability, it includes NC pins between high-voltage (VIN, SW, CBOOT) and low-voltage (PGND, GND) terminals to improve FMEA clearance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/SYNC | Enable & synchronization input | Active-high enable with precision UVLO; doubles as rising-edge sync input - forces FPWM mode and disables PFM when driven externally. |
| FB | Feedback input | Connects to resistor divider to set output voltage (1V to 95% VIN); ±1% reference accuracy enables tight regulation without calibration. |
| RT | Frequency setting input | Resistor-to-GND sets fSW from 200kHz to 2.2MHz; internal current source enables precise, temperature-stable frequency programming. |
| BIAS | Bias supply input | Connects to VOUT to power internal LDO efficiently - reduces VIN current and improves light-load efficiency when VOUT ≤ 12V. |
| PGOOD | Power-good open-drain output | Indicates regulation status (active-low); 92–110% VOUT window with 1.3% hysteresis - supports safe sequencing in multi-rail systems. |
| SW1–SW4 | Switch node terminals | Four paralleled switch nodes reduce current density and thermal stress; connect directly to inductor and bootstrap capacitor (SW4). |
| VIN1/VIN2 | Main input power inputs | Dual high-current VIN paths minimize parasitic inductance; require separate low-impedance connections to PGND1/PGND2 for optimal EMI performance. |
| PGND1/PGND2 | Power ground terminals | Separated ground returns for high-side/low-side MOSFETs - enable clean return paths and reduce ground bounce in high-dI/dt switching. |
Key Features
| Feature | Design Value |
|---|---|
| MINT 1 EMI Mitigation | Combines spread-spectrum modulation, symmetrical input routing, and Enhanced HotRod QFN to reduce peak radiated emissions by >10dB in CISPR 25 Class 5 bands. |
| FPWM Light-Load Mode | Guarantees fixed-frequency operation across entire load range - eliminates audible noise and simplifies EMI filter design versus PFM-based alternatives. |
| Soft Recovery from Dropout | Prevents output overshoot during line transient recovery - critical for powering microcontrollers and sensors without external reset supervision. |
| Functional Safety Support | Includes FIT rate data, failure mode analysis, and safety manual - accelerates ISO 26262 ASIL-B system-level certification for power supply blocks. |
| Wettable Flank QFN | Enables 100% automated optical inspection (AOI) of solder joints - satisfies automotive manufacturing traceability and zero-defect requirements. |
Applications
| Infotainment Head Unit Power | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powers SoC, DDR memory, and display interface in automotive head units requiring stable 5V/3.3V rails with low noise and fast transient response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator converting 12V battery to 5V/3.3V; operates at 2.1MHz to shrink filter components and avoid AM radio band. Use Value: 92.5% efficiency at 5V/6A/2.1MHz reduces thermal load on PCB; FPWM mode prevents frequency shifting during audio playback. |
Use Scenario: Supplies image sensor, ISP, and serializer in forward-facing ADAS cameras where EMI must comply with CISPR 25 Class 5 limits. IC Role / Device Role / Timing Role: Main power stage with MINT 1 architecture; uses spread spectrum and symmetrical layout to suppress switch-node ringing near RF receivers. Use Value: Enhanced HotRod QFN and dual-VIN routing cut common-mode EMI by >6dB; wettable flanks ensure solder joint reliability in vibration-prone mounting locations. |
| Cluster Display Backlight Driver | Body Control Module Core Rail |
|
Use Scenario: Generates 3.3V core rail for MCU and CAN transceivers in digital instrument clusters operating continuously at elevated ambient temperatures. IC Role / Device Role / Timing Role: High-efficiency buck converter with 150°C junction rating; uses BIAS pin connected to VOUT to maintain >90% efficiency at light loads. Use Value: 7µA no-load IQ extends battery runtime in key-off monitoring; thermal shutdown at 158°C–180°C prevents latch-up during prolonged sunload exposure. |
Use Scenario: Provides regulated 5V supply to microcontroller, LIN transceiver, and sensor interfaces in body control modules with wide input voltage variation. IC Role / Device Role / Timing Role: Input-tolerant buck regulator supporting cold-crank (3V) and load-dump (42V); soft-start and hiccup protection prevent brownout resets. Use Value: 3V–36V input range eliminates need for external surge clamping; precision enable pin enables controlled power-up sequencing with other subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM63460AASQRYFRQ1 | Same package and specs, but uses AUTO light-load mode (PFM/PWM auto-switching) instead of forced FPWM - higher light-load efficiency but variable frequency. | Preferred for battery-sensitive always-on domains (e.g., telematics wake-up circuits) where ultra-low IQ (<7µA) and minimal idle power matter more than EMI predictability. | Select LM63460AASQRYFRQ1 if PFM's variable frequency is acceptable and lowest possible no-load current is required; otherwise LM63460AFSQRYFRQ1 is optimal for EMI-controlled environments. |
| LM64460BPPQRYFRQ1 | Fixed 3.3V output (non-adjustable), same 6A rating and MINT 1 architecture, but uses pin-selectable spread spectrum and fixed 2.1MHz frequency - no RT/SYNC flexibility. | Suitable for cost-optimized designs where output voltage is invariant and board space is constrained - eliminates feedback resistors and RT network. | Choose LM64460BPPQRYFRQ1 for simplified BOM and layout in fixed-voltage applications; LM63460AFSQRYFRQ1 remains superior when adjustable output or frequency tuning is needed. |
Compared with LM63460AASQRYFRQ1, LM63460AFSQRYFRQ1 trades light-load IQ margin for deterministic EMI behavior; compared with LM64460BPPQRYFRQ1, it offers full configurability at the cost of two external resistors - making it the most flexible option for prototyping and multi-voltage platforms.
Availability
LM63460AFSQRYFRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital instrument clusters requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM63460AFSQRYFRQ1 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 and broad AEC-Q100 portfolio coverage.
The LM634x0-Q1 product line delivers high-efficiency, low-noise, functional-safety-ready buck converters for demanding automotive power rails - designed specifically for infotainment, ADAS, and body electronics where reliability, EMI, and thermal robustness are non-negotiable.
FAQ
What is the primary function of the EN/SYNC pin on the LM63460AFSQRYFRQ1?
The EN/SYNC pin on the LM63460AFSQRYFRQ1 serves dual roles: as a precision enable input with adjustable UVLO threshold (1.263V typical), and as a synchronization input accepting external clock signals on the rising edge. When used for sync, it forces the LM63460AFSQRYFRQ1 into FPWM mode and disables PFM operation - ensuring fixed-frequency switching for predictable EMI filtering. This behavior is inherent to the AF variant and distinguishes it from the AA version.
Does the LM63460AFSQRYFRQ1 support spread-spectrum frequency modulation?
Yes, the LM63460AFSQRYFRQ1 supports spread-spectrum frequency modulation as part of its MINT 1 architecture. It provides a 2% frequency deviation span around the center switching frequency, with a spread pattern frequency of 1.5 Hz at 2.1 MHz - reducing peak radiated emissions without compromising regulation stability. This feature is enabled by default and requires no external configuration.
What is the maximum output current capability of the LM63460AFSQRYFRQ1?
The LM63460AFSQRYFRQ1 delivers up to 6A of continuous DC output current across its full operating temperature range (–40°C to +125°C ambient). This rating assumes proper PCB layout with adequate copper area, thermal vias to the internal ground plane, and use of recommended external components - including low-ESR input capacitors and a 0.76 µH inductor. Derating may apply at high ambient temperatures or elevated switching frequencies.
How does the BIAS pin improve efficiency in the LM63460AFSQRYFRQ1?
The BIAS pin on the LM63460AFSQRYFRQ1 connects to the output voltage to power the internal LDO, reducing input current drawn from VIN and thereby improving conversion efficiency - especially at light loads. When VOUT ≤ 12V, connecting BIAS to VOUT lowers quiescent current and increases light-load efficiency; above 12V, BIAS must be tied to GND to avoid overstress. This feature is confirmed in the LM63460AFSQRYFRQ1 datasheet Section 5.1.
Is the LM63460AFSQRYFRQ1 pin-compatible with other members of the LM634x0-Q1 family?
Yes, the LM63460AFSQRYFRQ1 shares identical pinout, package (RYF, 22-pin Enhanced HotRod QFN), and footprint with all LM634x0-Q1 variants including LM63440-Q1, LM63460AASQRYFRQ1, and LM64460-Q1. This enables drop-in replacement across 4A/6A, FPWM/AUTO, and adjustable/fixed-output versions - provided external circuitry (e.g., feedback resistors, RT resistor, sync source) is compatible with the selected variant's functional mode.
LM63460AFSQRYFRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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:
- 6A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- 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)
LM63460AFSQRYFRQ1 FAQ
1.How can I place an order for LM63460AFSQRYFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM63460AFSQRYFRQ1 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 LM63460AFSQRYFRQ1 reliable?
The price and inventory of LM63460AFSQRYFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM63460AFSQRYFRQ1 is usually 5 days.
3.What payment methods are accepted for LM63460AFSQRYFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM63460AFSQRYFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM63460AFSQRYFRQ1?
LM63460AFSQRYFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM63460AFSQRYFRQ1 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 LM63460AFSQRYFRQ1?
For technical support, including LM63460AFSQRYFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM63460AFSQRYFRQ1 requirements.
6.How does Aetrix verify that LM63460AFSQRYFRQ1 is sourced from the original manufacturer or authorized distributors?
All LM63460AFSQRYFRQ1 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 LM63460AFSQRYFRQ1 meets industry standards.
7.What is the process for return or replacement of LM63460AFSQRYFRQ1?
All LM63460AFSQRYFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM63460AFSQRYFRQ1, 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 LM63460AFSQRYFRQ1 part is unused and in its original packaging.
Return procedure for LM63460AFSQRYFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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