My Inquiry
My Account
Texas Instruments LM61440AANQRJRRQ1
- Part No.:
- LM61440AANQRJRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
LM61440AANQRJRRQ1.pdf
- Description:
- IC REG BUCK ADJ 4A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,888
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM61440AANQRJRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC-DC converter delivering up to 4 A output current across 3 V–36 V input range, with ±1% total output regulation accuracy, 42-V load dump tolerance, and adjustable switching frequency from 200 kHz to 2.2 MHz. It serves as a primary power supply for infotainment head units and ADAS domain controllers requiring low EMI and functional safety support.
For engineers reviewing the LM61440AANQRJRRQ1 datasheet, LM61440AANQRJRRQ1 pinout, LM61440AANQRJRRQ1 application, or LM61440AANQRJRRQ1 equivalent, key selection criteria include its HotRod VQFN-HR package for EMI reduction, spread-spectrum capability, adjustable SW node rise time via RBOOT, Auto-mode light-load efficiency (7 µA no-load IQ), and AEC-Q100 qualification for under-hood deployment.
Technical Context
The LM61440AANQRJRRQ1 implements peak-current mode control with integrated high-side (41 mΩ typical RDS(on)) and low-side (21 mΩ typical RDS(on)) MOSFETs, enabling soft recovery from dropout and seamless PWM/PPM transition. Its dual VIN pins (VIN1/VIN2) and parallel input path minimize parasitic inductance, while the CBOOT/RBOOT interface allows precise control of SW node rise time (2.15 ns to 2.7 ns).
Switching frequency is set via RT resistor (200–2200 kHz) or synchronized externally; spread spectrum (±2% deviation at 1.5 Hz pattern frequency) reduces peak EMI emissions. Thermal shutdown triggers at 158–180°C with 10°C hysteresis, and PGOOD provides regulated output monitoring with 92–110% VOUT thresholds and 120 µs glitch filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 36 V operating; tolerant to 42 V transient - eliminates need for external surge clamping in 12/24-V automotive systems. |
| Output Current | Up to 4 A continuous - supports multi-rail power delivery for SoC-based infotainment and ADAS processors. |
| Regulation Accuracy | ±1% total output voltage accuracy - ensures stable core voltage for sensitive digital loads without external calibration. |
| No-Load Quiescent Current | 7 µA typical at 13.5 VIN/3.3 VOUT in Auto mode - enables always-on functionality in battery-backed modules. |
| Switching Frequency Range | 200 kHz to 2.2 MHz, adjustable via RT pin or SYNC - allows optimization for size (high-freq) or efficiency (low-freq) and AM-band avoidance. |
| EMI Mitigation Features | HotRod VQFN-HR package, spread spectrum, adjustable SW rise time, parallel input paths - meets CISPR-25 Class 5 without shielding. |
| Thermal Protection | Thermal shutdown at 158–180°C with 10°C hysteresis - prevents latch-up during sustained overload or poor heatsinking. |
Pinout & Package
VQFN-HR (14-pin) package with wettable flanks, 4.00 mm × 3.50 mm body size, optimized for thermal performance (RθJA = 25°C/W on 4-layer EVM) and low EMI layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS | Internal LDO input | Connects to VOUT to improve efficiency; if VOUT > 12 V, tie to ground - enables bias-assisted operation and noise immunity. |
| VCC | Internal LDO output | Supplies internal control circuitry; requires 1-µF capacitor to AGND - not for external loading. |
| AGND | Analog reference ground | Reference point for FB and VCC; must be connected to both PGND1 and PGND2 - critical for feedback stability. |
| FB | Feedback input | Connects to resistor divider tap; sets VOUT from 1 V to 95% of VIN - enables flexible rail generation without external error amplifier. |
| PGOOD | Open-drain status output | Indicates regulation status (high = OK); pulls low during fault or EN = low - replaces external supervisor IC in many designs. |
| RT | Frequency setting | Resistor-to-ground sets fSW (200–2200 kHz); open or floating disables adjustment - enables precise EMI band placement. |
| EN/SYNC | Enable & sync input | High = on; rising edge synchronizes to external clock - disables PFM when synced, enforcing forced PWM for deterministic timing. |
| VIN1 / VIN2 | Dual input power rails | Parallel paths reduce input loop inductance; must be low-impedance coupled - minimizes voltage spikes during high di/dt transients. |
| PGND1 / PGND2 | Power ground returns | Separate paths for low-side MOSFETs; require low-inductance PCB connection to VIN bypass caps - essential for EMI control and thermal dissipation. |
| SW | Switch node | Connects to output inductor; carries high di/dt; routed with minimal area - hot node requiring careful layout to suppress ringing. |
| RBOOT / CBOOT | Bootstrap gate drive | RBOOT adjusts SW rise time (2.15–2.7 ns); CBOOT holds 100-nF charge referenced to SW - controls EMI and cross-conduction risk. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Rated for –40°C to +150°C junction temperature - validated for engine bay and front-end ADAS module placement. |
| Ultra-low EMI architecture | HotRod package + spread spectrum + adjustable SW rise time + parallel VIN paths - achieves CISPR-25 Class 5 compliance without metal shielding. |
| Auto-mode light-load efficiency | 7 µA no-load IQ with automatic frequency foldback - extends battery life in always-on telematics and gateway applications. |
| Functional safety documentation | FIT rate, FMEA reports, and safety analysis files available - accelerates ISO 26262 ASIL-B system certification. |
| 42-V load dump tolerance | Withstands automotive ISO 7637-2 Pulse 5a without external TVS - simplifies front-end protection design for 12-V and 24-V systems. |
Applications
| Infotainment Head Unit Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC, DDR memory, and display interface in automotive head unit with strict EMI limits near AM/FM receivers. IC Role / Device Role / Timing Role: Primary 5-V/3.3-V buck regulator supplying processor core and I/O rails; operates at 2.1 MHz to avoid AM band. Use Value: HotRod package and spread spectrum eliminate need for shielded inductors or metal cans, reducing BOM cost by ~$0.35/unit. | Use Scenario: Supplies image sensor, ISP, and SerDes in rear-view or surround-view camera with tight thermal envelope. IC Role / Device Role / Timing Role: High-efficiency 1.8-V/1.2-V step-down converter with 7 µA quiescent current for parking-mode operation. Use Value: 0.3-V dropout at 3-A load and ±1% regulation ensure stable sensor biasing across battery voltage sag (9–16 V). |
| Body Control Module (BCM) Core Rail | Automotive USB-C Charging Port |
Use Scenario: Generates 3.3-V logic rail for microcontroller and CAN transceivers in centralized BCM with vibration and thermal stress. IC Role / Device Role / Timing Role: Main 3.3-V supply with PGOOD monitoring and thermal shutdown - replaces discrete LDO + supervisor combo. Use Value: Integrated PGOOD with 120 µs glitch filter and 92–110% trip thresholds eliminate external reset IC, saving 2.5 mm² PCB area. | Use Scenario: Provides adjustable 5-V/9-V/15-V output for USB PD negotiation in center console charging port with 42-V surge immunity. IC Role / Device Role / Timing Role: Programmable buck controller supporting variable VOUT (1 V to 95% of VIN) via FB divider - enables single-design reuse across PD profiles. Use Value: Adjustable SW rise time via RBOOT allows tuning for optimal EMI vs. efficiency trade-off during USB 3.x data burst transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61440AASQRJRRQ1 | Includes spread-spectrum EMI reduction; same pinout, package, and electrical specs otherwise. | Suitable for stricter EMI environments (e.g., premium infotainment near antenna modules) where peak emissions must be minimized. | Select LM61440AASQRJRRQ1 when CISPR-25 Class 5 margin is insufficient with base part; no layout change required. |
| LM61435AQQRJRRQ1 | 3.5-A rated (vs. 4-A); identical feature set, package, and pinout; shares same RT/EN/SYNC interface behavior. | Better suited for lower-power clusters or gateway nodes where 4-A headroom is unnecessary and cost sensitivity is higher. | Choose LM61435AQQRJRRQ1 for cost-optimized designs with ≤3.5-A peak load; leverages same layout and firmware. |
Compared with LM61440AANQRJRRQ1, LM61440AASQRJRRQ1 adds spread spectrum for tighter EMI control without sacrificing performance, while LM61435AQQRJRRQ1 reduces current rating to lower cost and thermal footprint - both retain full pin compatibility and software interoperability.
Availability
LM61440AANQRJRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control modules requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LM61440AANQRJRRQ1 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, with over 50 years of innovation in high-reliability electronics.
The LM61440-Q1 product line delivers high-efficiency, low-EMI synchronous buck converters engineered specifically for automotive power rails - targeting infotainment, ADAS, and body electronics where AEC-Q100 Grade 1 operation and functional safety readiness are mandatory.
FAQ
What is the maximum input voltage transient the LM61440AANQRJRRQ1 can withstand?
The LM61440AANQRJRRQ1 is rated for 42-V absolute maximum input voltage per its datasheet Absolute Maximum Ratings table. This enables direct use in automotive 12-V and 24-V systems without external TVS diodes to handle ISO 7637-2 Pulse 5a load dump events. The device maintains regulation and survives transients up to this level when properly decoupled with recommended input capacitors.
Does the LM61440AANQRJRRQ1 support spread-spectrum modulation?
No, the LM61440AANQRJRRQ1 does not include spread-spectrum modulation. That feature is present only in the LM61440AASQRJRRQ1 variant, as confirmed in the Device Comparison Table. The LM61440AANQRJRRQ1 relies on other EMI-reduction techniques - HotRod packaging, parallel VIN paths, and adjustable SW node rise time - to meet CISPR-25 Class 5 requirements.
What is the purpose of the RBOOT pin on the LM61440AANQRJRRQ1?
The RBOOT pin on the LM61440AANQRJRRQ1 connects to the CBOOT pin through an external resistor to control the rise time of the SW node. With RBOOT = 0 Ω, typical SW rise time is 2.15 ns; with RBOOT = 100 Ω, it increases to 2.7 ns. This adjustment directly impacts EMI profile and cross-conduction risk, allowing designers to tune for optimal noise vs. efficiency trade-offs in final layout.
Can the LM61440AANQRJRRQ1 operate with only one VIN pin connected?
No, both VIN1 and VIN2 pins must be connected to the input supply with low-impedance, symmetric PCB traces. The LM61440AANQRJRRQ1 uses a dual-input architecture to split high-frequency current return paths and minimize parasitic inductance. Using only one VIN pin degrades EMI performance, increases thermal stress, and violates the recommended layout guidelines specified in Section 12 of the datasheet.
What is the minimum output voltage achievable with the LM61440AANQRJRRQ1?
The LM61440AANQRJRRQ1 supports an adjustable output voltage range from 1 V to 95% of the input voltage, as stated in Section 8.3 Recommended Operating Conditions. Therefore, the absolute minimum output voltage is 1 V - verified across the full operating temperature range (–40°C to +150°C) and input range (3 V to 36 V). Output voltages below 1 V are not supported or characterized.
LM61440AANQRJRRQ1 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:
- 4A
- 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)
LM61440AANQRJRRQ1 FAQ
1.How can I place an order for LM61440AANQRJRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM61440AANQRJRRQ1 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 LM61440AANQRJRRQ1 reliable?
The price and inventory of LM61440AANQRJRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM61440AANQRJRRQ1 is usually 5 days.
3.What payment methods are accepted for LM61440AANQRJRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM61440AANQRJRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM61440AANQRJRRQ1?
LM61440AANQRJRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM61440AANQRJRRQ1 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 LM61440AANQRJRRQ1?
For technical support, including LM61440AANQRJRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM61440AANQRJRRQ1 requirements.
6.How does Aetrix verify that LM61440AANQRJRRQ1 is sourced from the original manufacturer or authorized distributors?
All LM61440AANQRJRRQ1 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 LM61440AANQRJRRQ1 meets industry standards.
7.What is the process for return or replacement of LM61440AANQRJRRQ1?
All LM61440AANQRJRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM61440AANQRJRRQ1, 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 LM61440AANQRJRRQ1 part is unused and in its original packaging.
Return procedure for LM61440AANQRJRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM61440AANQRJRRQ1 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…
