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Texas Instruments LM64460APPQRYFRQ1
- Part No.:
- LM64460APPQRYFRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerTFQFN
- Datasheet:
-
LM64460APPQRYFRQ1.pdf
- Description:
- IC REG BUCK ADJ 6A 22VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM64460APPQRYFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC/DC converter delivering 6A output current, supporting 3V–36V input with 42V load-dump tolerance, fixed 2.1MHz switching frequency, and pin-selectable spread spectrum and light-load mode (FPWM or AUTO). It operates in infotainment head units and ADAS power rails where EMI-sensitive timing and thermal robustness are critical.
For engineers reviewing the LM64460APPQRYFRQ1 datasheet, LM64460APPQRYFRQ1 pinout, LM64460APPQRYFRQ1 application, or LM64460APPQRYFRQ1 equivalent, key selection criteria include its fixed 2.1MHz operation (no RT resistor needed), wettable-flank Enhanced HotRod QFN-22 package for automotive solder-joint inspection, MINT 1 noise mitigation architecture, and functional safety documentation support for ISO 26262 ASIL-B system integration.
Technical Context
The LM64460APPQRYFRQ1 implements a dual-input, four-switch synchronous buck topology with integrated high-side (41mΩ typ) and low-side (21mΩ typ) MOSFETs, enabling 6A continuous output at up to 150°C junction temperature. Its fixed 2.1MHz switching frequency eliminates external RT component dependency while maintaining high efficiency (92.5% at 13.5VIN/5VOUT/6A) and ultra-low no-load quiescent current (7µA typical).
MINT 1 architecture integrates spread-spectrum modulation (±2% center deviation), symmetrical pin layout for optimal input capacitor placement, and parallel input paths to minimize parasitic inductance - all validated for automotive CISPR 25 Class 5 EMI compliance. Pin-selectable FPWM/AUTO mode and spread-spectrum enable/disable provide deterministic control over light-load behavior and spectral content without requiring external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V with 42V transient tolerance - supports full automotive battery range including cold-crank and load-dump events. |
| Output Current | 6A continuous - sufficient for powering SoC cores, GPU subsystems, or multi-rail ADAS sensor hubs without external current sharing. |
| Switching Frequency | Fixed 2.1MHz - enables compact magnetics, avoids AM/FM radio bands, and eliminates RT resistor calibration and layout sensitivity. |
| Feedback Accuracy | ±1% over –40°C to +125°C ambient - ensures stable voltage regulation across engine bay thermal extremes without trimming. |
| Quiescent Current | 7µA typical at no load - extends battery runtime in always-on vehicle modules such as telematics and domain controllers. |
| Thermal Limit | 150°C max junction temperature - rated for under-hood deployment with standard PCB thermal vias and 2-layer heatsinking. |
| EMI Architecture | MINT 1 with spread spectrum and Enhanced HotRod QFN - reduces peak radiated emissions by >10dB compared to non-MINT buck converters at same frequency. |
Pinout & Package
LM64460APPQRYFRQ1 uses the RYF (22-pin Enhanced HotRod™ QFN) package with wettable flanks for automated optical inspection and optimized thermal performance (RθJB = 8.8°C/W). The exposed thermal pad must be connected to inner-layer ground planes via ≥9 thermal vias (0.3mm diameter, 0.8mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/SYNC | Enable & synchronization input | Active-high enable with 1.263V threshold; accepts external clock edges for deterministic FPWM sync - no external pull-up required due to internal bias. |
| PGOOD | Open-drain power-good indicator | Asserts high when output is within ±3% of target; sinks ≤40Ω at 1mA - compatible with 3.3V/5V microcontroller GPIOs without level-shifting. |
| FB | Feedback voltage sense input | 1V reference with ±1% accuracy; connects to resistor divider for adjustable output or directly to VOUT for fixed 3.3V/5V variants. |
| VIN1 / VIN2 | Dual input power pins | Parallel high-current inputs reduce trace inductance; require independent 10µF ceramic bypass capacitors each to adjacent PGND pins. |
| SW1–SW4 | Switch node terminals | Four dedicated switch-node pads minimize loop area and ringing - SW1/SW2 connect to inductor; SW3/SW4 route bootstrap charge path. |
| PGND1 / PGND2 | Power ground return paths | Separated ground returns isolate high-di/dt currents; must be tied together only at single-point star ground near input capacitors. |
| BIAS | Efficiency-boosting LDO input | Connects to regulated output to reduce internal LDO losses - improves full-load efficiency by up to 1.2% when VOUT ≥ 3.3V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive power rail reliability requirements without derating. |
| MINT 1 noise mitigation | Integrated spread-spectrum modulation + symmetrical pinout + parallel input paths - achieves CISPR 25 Class 5 compliance without shielding or ferrites. |
| Fixed 2.1MHz operation | No RT resistor or external clock needed - eliminates BOM cost, layout sensitivity, and frequency drift over temperature/voltage. |
| Pin-selectable FPWM/AUTO mode | Jumper-selectable light-load behavior - FPWM guarantees constant frequency for EMI predictability; AUTO enables 7µA IQ for battery longevity. |
| Enhanced HotRod QFN with wettable flanks | 22-pin RYF package with solderable side walls - enables 100% automated optical inspection of solder joints per IPC-A-610 Class 3 standards. |
Applications
| Infotainment Head Unit Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC, display interface, and USB-C PD controller in automotive head units operating across battery voltage transients. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck regulator with PGOOD sequencing and thermal foldback protection. Use Value: Fixed 2.1MHz operation avoids AM band interference; 7µA IQ extends standby time during vehicle sleep mode. |
Use Scenario: Supplies image sensor, ISP, and SerDes in front-facing ADAS cameras mounted behind windshield. IC Role / Device Role / Timing Role: High-reliability 3.3V rail with MINT 1 EMI suppression to prevent RF coupling into analog video paths. Use Value: Wettable-flank QFN ensures solder-joint integrity in high-vibration environments; 150°C TJ rating supports sealed housing thermal design. |
| Body Control Module (BCM) Core Rail | Domain Controller Auxiliary Supply |
Use Scenario: Generates 5V core supply for microcontrollers and CAN transceivers in door modules and lighting ECUs. IC Role / Device Role / Timing Role: Input-tolerant buck converter handling 42V load-dump spikes without external TVS diodes. Use Value: Dual VIN1/VIN2 inputs reduce PCB trace inductance; 0.6µA shutdown current prevents battery drain during long-term parking. |
Use Scenario: Provides isolated 3.3V auxiliary rail for PCIe switch, Ethernet PHY, and security co-processor in zonal domain controllers. IC Role / Device Role / Timing Role: Secondary buck stage decoupled from main 12V bus, with PGOOD monitoring for fault isolation. Use Value: Pin-selectable spread-spectrum enables EMI tuning per board layout; BIAS connection improves efficiency at 6A full load by 0.9%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM63460AFSQRYFRQ1 | Adjustable-frequency (200kHz–2.2MHz) version with fixed FPWM light-load mode; requires RT resistor. | Better suited for designs needing frequency optimization for efficiency vs. size trade-offs or custom EMI notch placement. | Select when variable switching frequency is required; not drop-in due to RT pin usage and different light-load behavior. |
| LM64460BPPQRYFRQ1 | Pin-compatible 3.3V fixed-output variant; identical MINT 1 features, package, and 2.1MHz frequency. | Eliminates external feedback resistors - ideal for cost-sensitive, high-volume infotainment modules with standardized 3.3V rails. | Drop-in replacement only if 3.3V output is acceptable; differs in FB network configuration and no-adjustment capability. |
Compared with LM63460AFSQRYFRQ1, LM64460APPQRYFRQ1 offers deterministic 2.1MHz operation and simpler layout but less frequency flexibility; versus LM64460BPPQRYFRQ1, it provides output voltage adjustability at the cost of two external resistors - critical for multi-voltage systems requiring 5V, 3.3V, or custom outputs.
Availability
LM64460APPQRYFRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM64460APPQRYFRQ1 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 experience.
The LM64460APPQRYFRQ1 belongs to TI's LM634x0-Q1 family of AEC-Q100 synchronous buck converters designed specifically for automotive power rails demanding ultra-low EMI, functional safety readiness, and robust transient response in harsh environments.
FAQ
What is the switching frequency of LM64460APPQRYFRQ1 and is it adjustable?
The LM64460APPQRYFRQ1 operates at a fixed 2.1MHz switching frequency and does not support adjustment via RT resistor or SYNC signal. This eliminates frequency drift due to component tolerance or temperature variation, simplifies EMI filtering design, and ensures consistent performance across production lots. Unlike adjustable variants such as LM63460-Q1, the LM64460APPQRYFRQ1's fixed frequency is factory-set and cannot be modified in-circuit.
Does LM64460APPQRYFRQ1 support spread-spectrum modulation and how is it enabled?
Yes, LM64460APPQRYFRQ1 supports spread-spectrum modulation as part of its MINT 1 architecture. Spread spectrum is enabled or disabled using a dedicated pin (SS_EN) - tying it high activates ±2% frequency dithering to reduce peak EMI emissions, while grounding disables it for deterministic timing in noise-sensitive applications. This pin-selectable feature requires no external clock or configuration register access.
What is the maximum output current and thermal limit for LM64460APPQRYFRQ1?
The LM64460APPQRYFRQ1 delivers up to 6A continuous output current with a maximum junction temperature of 150°C. Its thermal performance is validated with RθJB = 8.8°C/W on standard 4-layer PCBs, enabling reliable operation in under-hood environments when paired with proper thermal vias and copper pour. Thermal shutdown triggers at 168°C (typical) with 10°C hysteresis to prevent cycling during transient overload conditions.
How does LM64460APPQRYFRQ1 handle light-load efficiency and what modes are available?
The LM64460APPQRYFRQ1 supports two pin-selectable light-load modes: FPWM (forced pulse-width modulation) and AUTO (frequency foldback). In AUTO mode, it achieves 7µA typical no-load input current; in FPWM mode, it maintains constant 2.1MHz switching for predictable EMI behavior. Selection is made externally via jumper or strap - no software or register writes are required, ensuring deterministic startup and fault recovery.
Is LM64460APPQRYFRQ1 qualified for automotive applications and what grade does it meet?
Yes, LM64460APPQRYFRQ1 is AEC-Q100 qualified for automotive applications and meets Grade 1 specifications, supporting ambient operating temperatures from –40°C to +125°C. It includes functional safety documentation to aid ISO 26262 ASIL-B system-level development and has undergone rigorous stress testing for humidity, vibration, and thermal cycling per automotive reliability standards.
LM64460APPQRYFRQ1 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:
- 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)
LM64460APPQRYFRQ1 FAQ
1.How can I place an order for LM64460APPQRYFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM64460APPQRYFRQ1 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 LM64460APPQRYFRQ1 reliable?
The price and inventory of LM64460APPQRYFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM64460APPQRYFRQ1 is usually 5 days.
3.What payment methods are accepted for LM64460APPQRYFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM64460APPQRYFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM64460APPQRYFRQ1?
LM64460APPQRYFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM64460APPQRYFRQ1 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 LM64460APPQRYFRQ1?
For technical support, including LM64460APPQRYFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM64460APPQRYFRQ1 requirements.
6.How does Aetrix verify that LM64460APPQRYFRQ1 is sourced from the original manufacturer or authorized distributors?
All LM64460APPQRYFRQ1 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 LM64460APPQRYFRQ1 meets industry standards.
7.What is the process for return or replacement of LM64460APPQRYFRQ1?
All LM64460APPQRYFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM64460APPQRYFRQ1, 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 LM64460APPQRYFRQ1 part is unused and in its original packaging.
Return procedure for LM64460APPQRYFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM64460APPQRYFRQ1 Tags
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