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Texas Instruments LM61430AFSQRJRRQ1
- Part No.:
- LM61430AFSQRJRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
LM61430AFSQRJRRQ1.pdf
- Description:
- IC REG BUCK ADJ 3A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,130
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Product details
Overview
LM61430AFSQRJRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC-DC converter delivering up to 3 A output current across 3 V–36 V input, with ±1% output regulation accuracy, 200 kHz–2.2 MHz adjustable switching frequency, and FPWM mode operation. It supports 42-V load dump tolerance and operates from –40°C to +150°C junction temperature in automotive infotainment power rails.
For engineers reviewing the LM61430AFSQRJRRQ1 datasheet, LM61430AFSQRJRRQ1 pinout, LM61430AFSQRJRRQ1 application, or LM61430AFSQRJRRQ1 equivalent, this page delivers verified functional safety-capable design data, low-EMI HotRod™ package implementation details, and precise FPWM-mode timing characteristics for automotive ADAS and body electronics power supply design.
Technical Context
The LM61430AFSQRJRRQ1 implements peak-current-mode control with integrated high-side (41 mΩ typical) and low-side (21 mΩ typical) MOSFETs, fixed FPWM operation (no auto PFM transition), and adjustable SW node rise time via RBOOT. Its dual VIN inputs (VIN1/VIN2) and parallel input path minimize parasitic inductance for ultra-low EMI compliance.
It features precision enable/synchronization on EN/SYNC (2.4 V sync edge threshold, 4–28 µs blanking), internal 3.3-V LDO (VCC), bias input for efficiency optimization, and a dedicated analog ground (AGND) referenced to FB and VCC-enabling stable feedback loop performance under wide temperature and load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 36 V operating; 42 V surge tolerant-eliminates need for external TVS in 12/24-V automotive systems. |
| Output Current | Up to 3 A continuous-supports USB-C PD, display backlight, and cluster MCU rails without derating at 150°C TJ. |
| Switching Frequency | 200 kHz to 2.2 MHz, adjustable via RT resistor-enables AM-band avoidance and compact magnetics selection. |
| Output Regulation Accuracy | ±1% total over line, load, and temperature-ensures reliable SoC core voltage stability in head units. |
| Quiescent Current | 7 µA in auto mode at no load-meets automotive always-on requirements for telematics modules. |
| Thermal Shutdown | Rising threshold 158°C–180°C with 10°C hysteresis-provides robust protection during sustained high-ambient operation. |
| EMI Optimization | HotRod™ VQFN-HR package + adjustable SW rise time + parallel VIN paths-reduces conducted emissions without shielding. |
Pinout & Package
VQFN-HR (14-pin), 4.00 mm × 3.50 mm body size, exposed thermal pad. Optimized pinout minimizes switch-node ringing and input loop inductance for low-EMI layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS | LDO bias input | Connects to output rail to improve light-load efficiency; capacitor to AGND enhances noise immunity. |
| VCC | Internal LDO output | Supplies internal control circuitry; requires 1-µF capacitor to AGND-no external loading permitted. |
| AGND | Analog reference ground | Reference point for FB and VCC; must be tied to both PGND1 and PGND2 on PCB for stability. |
| FB | Feedback input | Connects to resistor divider tap; sets output from 1 V to 95% of VIN-no floating or grounding allowed. |
| PGOOD | Open-drain status output | Indicates regulation status (high = OK); requires pull-up resistor; asserts low during EN=low or VIN<1 V. |
| RT | Frequency setting | Resistor to AGND sets fSW from 200 kHz to 2.2 MHz; open or grounded disables adjustment. |
| EN/SYNC | Enable & sync input | High = on; rising-edge sync input (2.4 V threshold); blanking window prevents false triggering. |
| VIN1 / VIN2 | Dual input power pins | Parallel paths reduce input loop inductance; each requires local bypass capacitors to respective PGND. |
| PGND1 / PGND2 | Power ground returns | Separate low-side MOSFET grounds; low-impedance connection between them required for EMI control. |
| SW | Switch node | Connects to inductor; high dv/dt node-layout critical for EMI; CBOOT capacitor ties here. |
| RBOOT / CBOOT | Bootstrap timing control | RBOOT adjusts SW rise time; CBOOT is 100-nF capacitor between SW and CBOOT for gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C TJ operation-enables use in engine bay–adjacent ADAS ECUs without derating. |
| FPWM-only operation mode | No PFM transition-ensures constant switching frequency for predictable EMI spectrum and timing-critical loads. |
| Adjustable SW node rise time | RBOOT resistor tunes dv/dt to balance EMI vs. efficiency-critical for CISPR 25 Class 5 compliance. |
| 42-V load dump tolerance | Withstands automotive ISO 7637-2 Pulse 5a without external clamping-reduces BOM count and board area. |
| Integrated high- and low-side MOSFETs | 41 mΩ HS / 21 mΩ LS RDS(ON)-enables >93% efficiency at 5 V/3 A, 2.1 MHz, reducing thermal design burden. |
| Functional safety documentation support | Includes FIT rate, failure mode analysis, and diagnostic coverage data-accelerates ASIL-B system certification. |
Applications
| Automotive Head Unit Power Supply | ADAS Camera Module Rail |
|---|---|
Use Scenario: Powers SoC, audio codec, and display interface in centralized infotainment head unit with 12-V battery input. IC Role / Device Role / Timing Role: Primary 5-V/3-A buck regulator supplying core logic and memory rails; FPWM mode ensures deterministic timing for real-time audio processing. Use Value: ±1% regulation accuracy maintains SoC voltage margin across temperature; 7-µA quiescent current extends battery runtime in accessory-off state. | Use Scenario: Supplies 3.3-V imaging sensor and ISP in front-facing ADAS camera with stringent EMI limits. IC Role / Device Role / Timing Role: Low-noise, low-EMI power stage synchronized to system clock via EN/SYNC pin to avoid image sensor interference bands. Use Value: HotRod™ package and adjustable SW rise time meet CISPR 25 Class 5 conducted emissions without shielded inductors. |
| Automotive Cluster Display Backlight | Body Control Module (BCM) Sub-Regulator |
Use Scenario: Generates 12-V backlight supply from 12-V battery for TFT LCD instrument cluster with PWM dimming control. IC Role / Device Role / Timing Role: Adjustable-output buck converter (1 V to 95% VIN) configured for 12-V output; RT pin set to 400 kHz for optimal inductor size and audible noise suppression. Use Value: Dual VIN inputs and parallel input path minimize input ripple; 42-V surge tolerance eliminates need for upstream TVS diode. | Use Scenario: Provides isolated 3.3-V rail for CAN transceiver and microcontroller in distributed BCM nodes. IC Role / Device Role / Timing Role: Secondary regulator downstream of main 5-V rail; uses BIAS pin connected to 5-V output to achieve <7-µA no-load current. Use Value: Internal LDO (VCC) and AGND-referenced feedback ensure stable regulation despite shared ground noise from motor drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61430AASQRJRRQ1 | Auto mode (PWM/PFM transition) instead of FPWM; 9-µA typical IQ vs. 7-µA; same pinout and package. | Better light-load efficiency in always-on telematics; less predictable EMI spectrum due to frequency foldback. | Select when lowest no-load power is critical and EMI spectrum flexibility is acceptable. |
| LM61435-Q1 | 3.5-A rating, identical FPWM mode, same 14-pin VQFN-HR package; higher RDS(ON) (HS: 48 mΩ, LS: 24 mΩ). | Supports higher-current ADAS radar modules; slightly lower efficiency at full load due to higher conduction loss. | Select when 3.5-A output capability is required and board layout reuse is prioritized. |
Compared with LM61430AASQRJRRQ1, the LM61430AFSQRJRRQ1 provides deterministic EMI behavior at the cost of slightly higher light-load current; compared with LM61435-Q1, it trades 0.5-A output headroom for lower RDS(ON) and improved full-load efficiency in space-constrained clusters.
Availability
LM61430AFSQRJRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body electronics requiring stable component supply, AEC-Q100 compliance, and functional safety documentation support.
Supply support for LM61430AFSQRJRRQ1 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.
The LM61430-Q1 product line delivers high-efficiency, low-EMI synchronous buck converters optimized for automotive infotainment, ADAS, and body electronics power rails demanding AEC-Q100 Grade 1 reliability and functional safety readiness.
FAQ
What distinguishes LM61430AFSQRJRRQ1 from other variants in the LM61430-Q1 family?
The LM61430AFSQRJRRQ1 is the FPWM-only variant of the LM61430-Q1 family, meaning it operates exclusively in forced pulse-width modulation mode without transitioning to PFM at light loads. This guarantees constant switching frequency for predictable EMI behavior-unlike the LM61430AASQRJRRQ1 (Auto mode) variant. It shares the same VQFN-HR 14-pin package, AEC-Q100 Grade 1 qualification, and 3-A output capability, but targets applications where spectral EMI control is prioritized over ultra-low quiescent current.
Does LM61430AFSQRJRRQ1 support synchronization to an external clock, and how is it implemented?
Yes, LM61430AFSQRJRRQ1 supports external clock synchronization via its EN/SYNC pin. A rising-edge signal with ≥2.4 V amplitude and <30 ns rise/fall time, AC-coupled through a capacitor, triggers synchronization. The device locks to external frequencies from 200 kHz to 2.2 MHz and enters forced PWM mode-disabling any PFM behavior. Blanking time (4–28 µs) prevents false triggering, and RENT/RENB resistors configure UVLO if used for enable functionality.
What is the purpose of the BIAS pin on LM61430AFSQRJRRQ1, and how should it be connected?
The BIAS pin on LM61430AFSQRJRRQ1 supplies the internal LDO, improving light-load efficiency when connected to the output voltage rail. For outputs ≤12 V, connect BIAS directly to VOUT; for outputs >12 V, tie BIAS to AGND. A 0.1–1-µF capacitor from BIAS to AGND enhances noise immunity. This configuration reduces LM61430AFSQRJRRQ1's no-load current to 7 µA, making it suitable for automotive always-on subsystems like telematics wake-up circuits.
How does the LM61430AFSQRJRRQ1 achieve ultra-low EMI performance without external shielding?
The LM61430AFSQRJRRQ1 achieves ultra-low EMI through three integrated features: (1) HotRod™ VQFN-HR package minimizing switch-node ringing, (2) parallel VIN1/VIN2 input paths reducing parasitic inductance, and (3) adjustable SW node rise time via RBOOT resistor. Together, these eliminate the need for ferrite beads or metal shields in most automotive designs-validated by conducted EMI test data showing compliance with CISPR 25 Class 5 at 2.1 MHz with standard PCB layout.
What thermal considerations apply to LM61430AFSQRJRRQ1 in automotive under-hood environments?
LM61430AFSQRJRRQ1 is rated for junction temperatures from –40°C to +150°C and includes thermal shutdown at 158–180°C with 10°C hysteresis. Its VQFN-HR package has RθJA = 58.7°C/W (JEDEC 4-layer board), but actual thermal performance depends on PCB copper area and thermal vias under the exposed pad. For under-hood use, TI recommends ≥4 cm² of 2-oz copper with ≥6 thermal vias (0.3-mm diameter) connecting to inner ground planes to maintain TJ ≤150°C at 3-A load and 85°C ambient.
LM61430AFSQRJRRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerVFQFN
- 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:
- 3A
- 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:
- 14-VQFN-HR (4x3.5)
LM61430AFSQRJRRQ1 FAQ
1.How can I place an order for LM61430AFSQRJRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM61430AFSQRJRRQ1 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 LM61430AFSQRJRRQ1 reliable?
The price and inventory of LM61430AFSQRJRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM61430AFSQRJRRQ1 is usually 5 days.
3.What payment methods are accepted for LM61430AFSQRJRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM61430AFSQRJRRQ1 transactions.
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4.How is shipping managed for LM61430AFSQRJRRQ1?
LM61430AFSQRJRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM61430AFSQRJRRQ1 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 LM61430AFSQRJRRQ1?
For technical support, including LM61430AFSQRJRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM61430AFSQRJRRQ1 requirements.
6.How does Aetrix verify that LM61430AFSQRJRRQ1 is sourced from the original manufacturer or authorized distributors?
All LM61430AFSQRJRRQ1 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 LM61430AFSQRJRRQ1 meets industry standards.
7.What is the process for return or replacement of LM61430AFSQRJRRQ1?
All LM61430AFSQRJRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM61430AFSQRJRRQ1, 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 LM61430AFSQRJRRQ1 part is unused and in its original packaging.
Return procedure for LM61430AFSQRJRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM61430AFSQRJRRQ1 Tags
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