My Inquiry
My Account
Texas Instruments LM61435AANQRJRRQ1
- Part No.:
- LM61435AANQRJRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
LM61435AANQRJRRQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,527
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM61435AANQRJRRQ1 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 a 3-V to 36-V input range, with ±1% total output regulation accuracy, 42-V load dump tolerance, and integrated high-side/low-side MOSFETs. It serves as the primary power supply for infotainment head units and ADAS domain controllers.
For engineers reviewing the LM61435AANQRJRRQ1 datasheet, LM61435AANQRJRRQ1 pinout, LM61435AANQRJRRQ1 application, or LM61435AANQRJRRQ1 equivalent, key selection considerations include its VQFN-HR (14-pin) package, adjustable switching frequency (200 kHz–2.2 MHz), spread-spectrum EMI reduction, soft-recovery dropout behavior, and functional safety documentation support.
Technical Context
The LM61435AANQRJRRQ1 implements peak-current-mode control with frequency foldback in Auto Mode, enabling 7-µA no-load quiescent current at 13.5-VIN/3.3-VOUT. Its HotRod™ VQFN-HR package features dual VIN pins (VIN1/VIN2) and dual PGND pins (PGND1/PGND2) to minimize parasitic inductance and switch-node ringing.
It supports pseudo-random spread spectrum (±2% frequency deviation), adjustable SW node rise time via RBOOT, and external synchronization (200 kHz–2.2 MHz). The device integrates an internal LDO (VCC = 3.3 V), precision enable with UVLO hysteresis (VEN-ACC = ±5%), and PGOOD with 1.3% hysteresis referenced to VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 36 V; withstands 42-V automotive load dump transients without external protection |
| Output Current | Up to 3.5 A continuous; supports full load down to 3.95-VIN at 3.3-VOUT |
| Regulation Accuracy | ±1% total output voltage accuracy over –40°C to +150°C junction temperature |
| Quiescent Current | 7 µA typical at no load (13.5-VIN, 3.3-VOUT, Auto Mode), enabling always-on automotive systems |
| Switching Frequency | Adjustable 200 kHz to 2.2 MHz via RT resistor or external SYNC signal; avoids AM band interference |
| EMI Reduction | Integrated spread spectrum (±2%), adjustable SW rise time, and low-ringing HotRod™ VQFN-HR package |
| Thermal Rating | AEC-Q100 Grade 1 (–40°C to +150°C TJ); thermal shutdown at 158°C–180°C with 10°C hysteresis |
Pinout & Package
VQFN-HR (14-pin) package, 4.00 mm × 3.50 mm body size, exposed thermal pad, RoHS-compliant, moisture sensitivity level (MSL) 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS | Internal LDO bias input | Connect to VOUT to improve light-load efficiency; tie to GND if VOUT > 12 V |
| VCC | Internal LDO output | 3.3-V supply for control circuitry; requires 1-µF capacitor to AGND; no external loading |
| AGND | Analog ground reference | Reference point for FB, VCC, and internal error amplifier; must be connected to both PGND1 and PGND2 |
| FB | Feedback voltage input | Connects to resistive divider tap; sets VOUT from 1 V to 95% of VIN; ±1% reference accuracy |
| PGOOD | Open-drain power-good status | Asserts high when VOUT is within 94–110% of target; 1.3% hysteresis prevents chatter during transients |
| RT | Frequency setting/sync input | Resistor-to-GND sets fSW (200 kHz–2.2 MHz); also accepts external clock for synchronization |
| EN/SYNC | Enable & sync control | Precision enable threshold (1.263 V, ±5%); rising-edge triggered sync; disables PFM when synchronized |
| VIN1 / VIN2 | Dual input power paths | Parallel high-current inputs reduce loop inductance; each requires local high-quality bypass capacitors |
| PGND1 / PGND2 | Dual power ground returns | Low-inductance return paths for internal low-side MOSFET; must be tied together on PCB |
| SW | Switch node output | Connects directly to output inductor; hot-switching node requiring tight layout and minimal trace area |
| RBOOT | SW rise-time control | Resistor between RBOOT and CBOOT adjusts dV/dt to suppress EMI without sacrificing efficiency |
| CBOOT | High-side gate driver supply | 100-nF bootstrap capacitor between CBOOT and SW; internal diode charges from VCC |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +150°C TJ) with production test coverage for safety-critical systems |
| Ultra-low EMI design | HotRod™ package + parallel VIN/PGND paths + adjustable SW rise time eliminate need for shielding or ferrites |
| Scalable pin compatibility | Identical pinout with LM61440-Q1 (4 A) and LM61460-Q1 (6 A), enabling hardware reuse across power tiers |
| Efficiency optimization | 7-µA no-load IQ + external BIAS option + Auto Mode frequency foldback maximize battery runtime in always-on modules |
| Robust protection suite | Integrated thermal shutdown (158°C–180°C), hiccup-mode short-circuit response (80-ms wait), and 42-V surge tolerance |
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 from 12-V battery with cold-crank (3.0-V) and load-dump (42-V) transients. IC Role / Device Role / Timing Role: Primary 3.3-V/5-V buck regulator with PGOOD signaling to SoC reset logic and soft-recovery dropout handling. Use Value: ±1% regulation accuracy ensures stable SoC operation; 7-µA quiescent current extends battery life during vehicle sleep mode. | Use Scenario: Supplies image sensor, ISP, and serializer in front-facing ADAS cameras where EMI must avoid interfering with radar or V2X bands. IC Role / Device Role / Timing Role: Low-noise, spread-spectrum synchronous buck delivering 1.8-V/3.3-V rails with <2.2-MHz switching to stay above AM band. Use Value: Adjustable SW rise time and HotRod™ package reduce conducted emissions by >10 dBµV, eliminating shielded enclosures. |
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
Use Scenario: Provides regulated 5-V rail for microcontroller, CAN transceivers, and LIN interfaces in BCMs subjected to wide ambient temperature swings. IC Role / Device Role / Timing Role: High-efficiency buck converter with integrated MOSFETs and thermal shutdown for under-hood deployment. Use Value: 150°C max TJ rating and 58.7°C/W θJA enable operation in sealed enclosures without forced airflow. | Use Scenario: Powers LTE modem, GNSS receiver, and secure element in always-connected TCUs requiring ultra-low standby power. IC Role / Device Role / Timing Role: Automotive-grade buck with BIAS input and Auto Mode to achieve sub-10-µA system-level sleep current. Use Value: External BIAS connection reduces no-load IQ to 7 µA, meeting UNECE R100 Class 3 battery drain requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61435AASQRJRRQ1 | Includes spread-spectrum EMI reduction; same pinout, package, and electrical specs otherwise | Better suited for noise-sensitive environments (e.g., radar proximity, audio amplifiers) where peak EMI must be suppressed | Select LM61435AASQRJRRQ1 when conducted EMI limits require >6 dB peak reduction beyond baseline |
| LM61440AQQRJRRQ1 | 4-A rated output; identical pinout and package but higher RDS(on) (HS: 48 mΩ, LS: 24 mΩ) and slightly higher IQ (9 µA) | Used where future-proofing for higher current or margin against derating at high TA is required | Choose LM61440AQQRJRRQ1 when design load exceeds 3.2 A continuous or thermal margin is constrained |
Compared with LM61435AANQRJRRQ1, LM61435AASQRJRRQ1 adds spread spectrum at no cost to efficiency or footprint, while LM61440AQQRJRRQ1 trades 0.5-A extra current capacity for marginally higher conduction loss and quiescent draw-both retain full pin compatibility and AEC-Q100 Grade 1 qualification.
Availability
LM61435AANQRJRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LM61435AANQRJRRQ1 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 LM61435-Q1 product line delivers high-efficiency, low-EMI DC-DC conversion for automotive subsystems demanding AEC-Q100 qualification, extended temperature operation, and robust transient immunity.
FAQ
What is the maximum input voltage the LM61435AANQRJRRQ1 can withstand without damage?
The LM61435AANQRJRRQ1 has an absolute maximum input voltage rating of 42 V across VIN1 and VIN2 pins, making it suitable for automotive 12-V systems subject to ISO 7637-2 load-dump transients. This rating is validated per AEC-Q100 stress testing and allows direct connection to battery rails without external TVS clamping in most cases. Operation above 36 V is not recommended for sustained duty cycles.
Does the LM61435AANQRJRRQ1 support fixed-output voltage configurations?
Yes, the LM61435AANQRJRRQ1 supports a factory-programmed 3.3-V fixed output option in addition to the standard adjustable version (1 V to 95% of VIN). The fixed-output variant uses internal feedback resistors and eliminates the need for external divider components, reducing BOM count and layout area. Output accuracy remains ±1% over temperature and line conditions.
How does the LM61435AANQRJRRQ1 achieve ultra-low EMI performance?
The LM61435AANQRJRRQ1 achieves ultra-low EMI through three integrated techniques: (1) HotRod™ VQFN-HR package minimizing switch-node parasitic inductance, (2) parallel VIN1/VIN2 and PGND1/PGND2 paths reducing high-frequency loop area, and (3) adjustable SW node rise time via RBOOT pin to control dV/dt without sacrificing efficiency. These features collectively suppress peak conducted emissions by >10 dBµV versus conventional QFN packages.
Can the LM61435AANQRJRRQ1 be synchronized to an external clock source?
Yes, the LM61435AANQRJRRQ1 supports external synchronization via the EN/SYNC pin, accepting rising-edge-triggered clocks from 200 kHz to 2.2 MHz. When synchronized, the device operates in forced PWM mode and disables Auto Mode frequency foldback. This enables deterministic switching alignment across multiple converters in complex automotive ECUs, reducing beat frequencies and improving system-level EMI predictability.
What thermal metrics apply to the LM61435AANQRJRRQ1 in its VQFN-HR package?
The LM61435AANQRJRRQ1 in the 14-pin VQFN-HR (RJR) package has a junction-to-ambient thermal resistance (RθJA) of 58.7°C/W per JESD 51-7 simulation on a 4-layer JEDEC board, and a measured RθJA of 25°C/W on the LM61460-Q1 EVM layout. Its junction-to-case (top) resistance is 26.1°C/W, supporting thermal vias to internal ground planes. These values enable reliable 3.5-A operation at +105°C ambient with appropriate PCB copper area.
LM61435AANQRJRRQ1 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)
LM61435AANQRJRRQ1 FAQ
1.How can I place an order for LM61435AANQRJRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM61435AANQRJRRQ1 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 LM61435AANQRJRRQ1 reliable?
The price and inventory of LM61435AANQRJRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM61435AANQRJRRQ1 is usually 5 days.
3.What payment methods are accepted for LM61435AANQRJRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM61435AANQRJRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM61435AANQRJRRQ1?
LM61435AANQRJRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM61435AANQRJRRQ1 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 LM61435AANQRJRRQ1?
For technical support, including LM61435AANQRJRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM61435AANQRJRRQ1 requirements.
6.How does Aetrix verify that LM61435AANQRJRRQ1 is sourced from the original manufacturer or authorized distributors?
All LM61435AANQRJRRQ1 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 LM61435AANQRJRRQ1 meets industry standards.
7.What is the process for return or replacement of LM61435AANQRJRRQ1?
All LM61435AANQRJRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM61435AANQRJRRQ1, 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 LM61435AANQRJRRQ1 part is unused and in its original packaging.
Return procedure for LM61435AANQRJRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM61435AANQRJRRQ1 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
