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Texas Instruments LM61435AFSQRJRRQ1
- Part No.:
- LM61435AFSQRJRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
LM61435AFSQRJRRQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,729
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Product details
Overview
LM61435AFSQRJRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC-DC converter delivering up to 3.5 A output current across 3 V–36 V input range, with ±1% total output regulation accuracy, 200 kHz–2.2 MHz adjustable switching frequency, and FPWM mode enabled by default per its "F" suffix. It powers infotainment head units and ADAS domain controllers requiring low EMI and 42-V load dump tolerance.
For engineers reviewing the LM61435AFSQRJRRQ1 datasheet, LM61435AFSQRJRRQ1 pinout, LM61435AFSQRJRRQ1 application, or LM61435AFSQRJRRQ1 equivalent, key selection criteria include its FPWM-only operation (no auto-mode PFM), spread-spectrum EMI reduction, adjustable SW node rise time via RBOOT, 14-pin VQFN-HR package with dual VIN/PGND inputs, and functional safety documentation support.
Technical Context
The LM61435AFSQRJRRQ1 implements peak-current-mode control with integrated high-side (41 mΩ typ) and low-side (21 mΩ typ) MOSFETs, fixed FPWM operation (no light-load frequency foldback), and pseudo-random spread spectrum for conducted EMI suppression. Its dual-input VIN1/VIN2 and dual-PGND1/PGND2 layout minimizes parasitic inductance, while the RBOOT-adjustable SW node rise time enables fine-tuned EMI optimization without external components.
Thermal design leverages a 4.0 mm × 3.5 mm VQFN-HR package with 26.1°C/W junction-to-case (top) thermal resistance and supports continuous operation at TJ = –40°C to +150°C. The device uses an internal LDO (VCC = 3.3 V) powered via BIAS pin, and includes precision enable (VEN = 1.263 V) with 28% hysteresis and integrated power-good (PGOOD) with 94–107% output voltage thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 36 V; withstands 42 V transient - eliminates need for upstream TVS in automotive load-dump scenarios |
| Output Current | Up to 3.5 A continuous - supports multi-rail SoC power domains in ADAS ECUs |
| Switching Frequency | 200 kHz to 2.2 MHz, set via RT resistor - enables AM-band avoidance and compact magnetics |
| Output Regulation Accuracy | ±1% total over line/load/temp - ensures stable core voltage for automotive microcontrollers |
| Quiescent Current | 7 µA typical in FPWM mode at no load - sustains always-on functionality without battery drain |
| EMI Features | Spread spectrum + adjustable SW rise time + HotRod™ VQFN-HR package - reduces peak emissions without shielding |
| Thermal Rating | AEC-Q100 Grade 1 (–40°C to +150°C TJ) - qualified for under-hood and cockpit applications |
Pinout & Package
Package: 14-pin VQFN-HR (4.00 mm × 3.50 mm), wettable flank, exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | LDO bias input | Connects to VOUT to improve efficiency; tie to GND if VOUT > 12 V - enables external bias optimization |
| VCC (2) | Internal LDO output | Powers internal control circuitry; requires 1-µF capacitor to AGND - not for external loading |
| AGND (3) | Analog reference ground | Reference point for FB and VCC; must be low-impedance connected to both PGND1 and PGND2 |
| FB (4) | Feedback voltage input | Connects to resistor divider tap; sets output from 1 V to 95% of VIN - enables flexible rail generation |
| PGOOD (5) | Open-drain status output | Indicates valid regulation (94–107% VOUT); requires pull-up - replaces external supervisor IC |
| RT (6) | Frequency setting input | Resistor to GND sets fSW from 200 kHz to 2.2 MHz - allows noise-sensitive band avoidance |
| EN/SYNC (7) | Enable/synchronization input | 1.263 V threshold with 28% hysteresis; accepts external clock for forced PWM sync - disables PFM |
| VIN1, VIN2 (8,12) | Dual input power rails | Parallel paths reduce input loop inductance; each requires local bypass to respective PGND - critical for EMI |
| PGND1, PGND2 (9,11) | Dual power ground returns | Low-inductance return paths for internal MOSFETs; must be short-connected on PCB - minimizes ground bounce |
| SW (10) | Switch node | Connects to output inductor; features adjustable rise time via RBOOT/CBOOT - direct EMI tuning point |
| RBOOT (13) | SW rise-time control | Resistor between RBOOT and CBOOT sets dV/dt - 0 Ω to open enables 2.15–2.7 ns rise time adjustment |
| CBOOT (14) | High-side gate driver supply | 100-nF capacitor to SW; charged via internal diode from VCC - ensures robust high-side drive |
Key Features
| Feature | Design Value |
|---|---|
| FPWM-only operation | Eliminates frequency modulation artifacts; guarantees constant switching frequency for predictable EMI filtering |
| Spread-spectrum modulation | ±2% frequency deviation centered on fSW - reduces peak conducted emissions by up to 10 dB |
| Dual VIN/PGND inputs | Split power path halves input loop area - cuts high-frequency magnetic field emission by >6 dB |
| Adjustable SW node rise time | RBOOT resistor tunes dV/dt from 2.15 ns to 2.7 ns - balances EMI vs. switching loss trade-off |
| Integrated power-good (PGOOD) | Programmable 94–107% VOUT window with 120 µs glitch filter - removes need for external reset IC |
| Functional safety documentation | Available FIT rate, failure mode analysis, and diagnostic coverage reports - accelerates ISO 26262 ASIL-B integration |
Applications
| Automotive Infotainment Head Unit | ADAS Camera Module Power |
|---|---|
Use Scenario: Powers SoC, DDR memory, and display interface in vehicle head unit with CAN/FlexRay connectivity. IC Role / Device Role / Timing Role: Primary 5-V/3.3-V buck regulator supplying core logic and I/O rails. Use Value: ±1% regulation and 7-µA quiescent current maintain system wakefulness during sleep modes without battery depletion. | Use Scenario: Supplies image sensor, ISP, and serializer in front-facing ADAS camera with ambient temperature range –40°C to +105°C. IC Role / Device Role / Timing Role: Main 3.3-V power stage with fast transient response for pixel data bursts. Use Value: 3.5-A capability and 42-V surge tolerance ensure uninterrupted operation during cold-crank and load-dump events. |
| Automotive Cluster Display | Body Control Module (BCM) Subsystem |
Use Scenario: Generates 1.8-V and 1.2-V rails for MCU and graphics processor in digital instrument cluster. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for multiple VOUT settings via FB divider. Use Value: 200 kHz–2.2 MHz fSW flexibility allows optimal inductor sizing for space-constrained cluster PCB layouts. | Use Scenario: Provides regulated 5-V supply for LIN transceivers, LED drivers, and sensor interfaces in door module. IC Role / Device Role / Timing Role: High-efficiency, low-noise power source meeting CISPR 25 Class 5 EMI limits. Use Value: HotRod™ package and spread spectrum eliminate need for metal shielding - reduces BOM cost and assembly steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61435AANQRJRRQ1 | Auto-mode (PWM+PFM), no spread spectrum, same pinout/package | Better light-load efficiency (83% @1 mA), higher peak EMI | Select when ultra-low IQ is critical and EMI filters are acceptable |
| LM61435AASQRJRRQ1 | Auto-mode + spread spectrum, same pinout/package | Compromise between LM61435AFSQRJRRQ1 and LM61435AANQRJRRQ1 EMI/efficiency profiles | Select when both light-load efficiency and moderate EMI reduction are required |
Compared with LM61435AANQRJRRQ1 and LM61435AASQRJRRQ1, the LM61435AFSQRJRRQ1 prioritizes deterministic EMI behavior and noise immunity over light-load efficiency - making it optimal for systems where spectral purity matters more than standby current.
Availability
LM61435AFSQRJRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, digital instrument clusters, and body electronics requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LM61435AFSQRJRRQ1 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 solutions.
The LM61435-Q1 product line delivers high-efficiency, low-EMI DC-DC conversion for automotive subsystems demanding AEC-Q100 qualification, functional safety readiness, and robust operation under harsh electrical and thermal conditions.
FAQ
What does the 'F' in LM61435AFSQRJRRQ1 indicate?
The 'F' suffix in LM61435AFSQRJRRQ1 denotes FPWM (Forced Pulse Width Modulation) mode - meaning the device operates exclusively in fixed-frequency PWM, with no automatic transition to PFM at light loads. This ensures consistent switching frequency for predictable EMI filtering and eliminates frequency modulation artifacts in noise-sensitive automotive applications.
Does LM61435AFSQRJRRQ1 support adjustable output voltage?
Yes, LM61435AFSQRJRRQ1 supports adjustable output voltage from 1 V to 95% of VIN using an external resistor divider on the FB pin. It also offers factory-programmed fixed 3.3-V output variants, but the LM61435AFSQRJRRQ1 itself is the adjustable version - confirmed by TI's device comparison table listing it as "Adjustable" under OUTPUT VOLTAGE.
How is EMI reduced in LM61435AFSQRJRRQ1 compared to standard buck converters?
LM61435AFSQRJRRQ1 reduces EMI through three integrated mechanisms: (1) pseudo-random spread spectrum (±2% fSW deviation), (2) adjustable SW node rise time via RBOOT resistor (2.15–2.7 ns tuning), and (3) HotRod™ VQFN-HR package with parallel VIN/PGND inputs that minimize switch-node ringing and input loop inductance - collectively enabling compliance with CISPR 25 Class 5 without shielding.
What is the maximum junction temperature rating for LM61435AFSQRJRRQ1?
The LM61435AFSQRJRRQ1 is rated for continuous operation at junction temperatures from –40°C to +150°C, meeting AEC-Q100 Grade 1 requirements. This is validated by thermal characterization data showing RθJC(top) = 26.1°C/W and guaranteed electrical performance across the full range - essential for under-hood and dashboard-mounted automotive applications.
Can LM61435AFSQRJRRQ1 be synchronized to an external clock?
Yes, LM61435AFSQRJRRQ1 supports external synchronization via the EN/SYNC pin (Pin 7). When driven with a clean clock signal (rising-edge triggered, ≥2.4 V edge height, <30 ns rise/fall time), the device locks to the external frequency and operates in forced PWM mode - disabling PFM and ensuring deterministic timing for multi-rail coordinated power sequencing.
LM61435AFSQRJRRQ1 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:
- 3.5A
- 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)
LM61435AFSQRJRRQ1 FAQ
1.How can I place an order for LM61435AFSQRJRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM61435AFSQRJRRQ1 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 LM61435AFSQRJRRQ1 reliable?
The price and inventory of LM61435AFSQRJRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM61435AFSQRJRRQ1 is usually 5 days.
3.What payment methods are accepted for LM61435AFSQRJRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM61435AFSQRJRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM61435AFSQRJRRQ1?
LM61435AFSQRJRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM61435AFSQRJRRQ1 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 LM61435AFSQRJRRQ1?
For technical support, including LM61435AFSQRJRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM61435AFSQRJRRQ1 requirements.
6.How does Aetrix verify that LM61435AFSQRJRRQ1 is sourced from the original manufacturer or authorized distributors?
All LM61435AFSQRJRRQ1 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 LM61435AFSQRJRRQ1 meets industry standards.
7.What is the process for return or replacement of LM61435AFSQRJRRQ1?
All LM61435AFSQRJRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM61435AFSQRJRRQ1, 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 LM61435AFSQRJRRQ1 part is unused and in its original packaging.
Return procedure for LM61435AFSQRJRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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