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Texas Instruments LM62440APPQRJRRQ1
- Part No.:
- LM62440APPQRJRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
LM62440APPQRJRRQ1.pdf
- Description:
- IC REG BUCK ADJ 4A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,933
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Product details
Overview
LM62440APPQRJRRQ1 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, with ±1% total output regulation accuracy, 2.1-MHz fixed switching frequency, and integrated high-side/low-side MOSFETs. It supports 42-V load dump, operates from –40°C to +150°C, and targets infotainment head units and ADAS power rails.
For engineers reviewing the LM62440APPQRJRRQ1 datasheet, LM62440APPQRJRRQ1 pinout, LM62440APPQRJRRQ1 application, or LM62440APPQRJRRQ1 equivalent, key selection criteria include its ultra-low EMI HotRod™ VQFN-HR package, factory-set 2.1-MHz operation, adjustable SW node rise time via RBOOT, FPWM mode enablement, and automotive-grade thermal and safety compliance.
Technical Context
The LM62440APPQRJRRQ1 implements a current-mode control architecture with soft recovery from dropout and seamless PWM-to-PFM transition. Its dual VIN pins (VIN1/VIN2) and parallel input path reduce EMI, while the MODE/SYNC pin selects FPWM mode or external synchronization between 200 kHz and 2.2 MHz.
It integrates a 41 mΩ high-side and 21 mΩ low-side MOSFET pair, uses a 14-pin VQFN-HR (4.0 mm × 3.5 mm) package with wettable flanks, and features spread spectrum modulation, adjustable SW rise time (via RBOOT), and internal LDO biasing via BIAS/VCC pins for efficiency optimization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 36 V; supports 42-V automotive load dump for 400 ms |
| Output Current | Up to 4 A continuous; derating applies at high ambient temperature or high fSW |
| Switching Frequency | Factory-set 2.1 MHz; enables compact magnetics and avoids AM band interference |
| Output Regulation Accuracy | ±1% total over line, load, and temperature; ensures stable MCU/SoC supply |
| Quiescent Current | 7 µA at no load (13.5 VIN, 3.3 VOUT); extends battery runtime in always-on systems |
| Thermal Rating | AEC-Q100 Grade 1: –40°C to +150°C junction temperature operation |
| EMI Optimization | HotRod™ package, parallel input paths, spread spectrum, and adjustable SW rise time |
Pinout & Package
The LM62440APPQRJRRQ1 is housed in a 14-pin VQFN-HR (RJR) package measuring 4.00 mm × 3.50 mm with wettable flanks for automated optical inspection. Thermal performance is enhanced by exposed thermal pad connected to PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | LDO bias input | Connects to VOUT to improve light-load efficiency; tie to GND if VOUT > 12 V |
| VCC (2) | Internal LDO output | Supplies internal control circuitry; requires 1-µF capacitor to AGND; no external loading |
| AGND (3) | Analog ground reference | Reference point for FB and VCC; must be shorted to both PGND1 and PGND2 on PCB |
| FB (4) | Feedback input | Connects to feedback divider tap (adjustable) or directly to VOUT (3.3 V/5 V fixed options) |
| PGOOD (5) | Open-drain status output | Signals valid regulation (high) or fault (low); requires external pull-up resistor |
| MODE/SYNC (6) | Mode control & sync input | Selects auto/FPWM mode or external clock sync; controls spread spectrum activation |
| EN (7) | Enable input | Logic-high enables converter; precision threshold (1.263 V) allows adjustable UVLO |
| VIN1 (8), VIN2 (12) | Power inputs | Dual inputs with parallel path minimize input loop inductance and EMI |
| PGND1 (9), PGND2 (11) | Power ground returns | Separate low-side MOSFET grounds; must be low-impedance and joined to AGND |
| SW (10) | Switch node | Connects to output inductor; high dV/dt node requiring tight layout and minimized trace area |
| RBOOT (13) | Rise-time control | Resistor between RBOOT and CBOOT sets SW node rise time (0 Ω to open) |
| CBOOT (14) | Bootstrap supply rail | Charged via internal diode from VCC; requires 100-nF capacitor to SW |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low EMI design | HotRod™ VQFN-HR package minimizes switch-node ringing; parallel VIN paths reduce common-mode noise |
| Spread spectrum modulation | Reduces peak conducted emissions by spreading energy across ±2% of center frequency |
| Adjustable SW node rise time | RBOOT resistor tunes dV/dt to balance EMI vs. efficiency without changing layout |
| Pin-selectable FPWM mode | Ensures constant-frequency operation at light loads-critical for noise-sensitive audio/RF subsystems |
| Automotive functional safety support | Documentation available for ISO 26262 ASIL-B system-level integration and FMEDA analysis |
Applications
| Infotainment Head Unit Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC, display interface, and USB-C PD controller in automotive head units with strict EMC limits. IC Role / Device Role / Timing Role: Primary 5-V or 3.3-V buck regulator delivering clean, low-noise power with fast transient response. Use Value: 2.1-MHz operation enables <10-µH inductors; ±1% regulation maintains SoC core voltage stability under dynamic load steps. | Use Scenario: Supplies image sensor, ISP, and serializer in front/rear-view camera modules operating in engine bay environments. IC Role / Device Role / Timing Role: High-reliability 3.3-V buck converter handling wide input transients including cold-crank (3 V) and load dump (42 V). Use Value: AEC-Q100 Grade 1 rating and –40°C to +150°C operation ensure uninterrupted function during extreme thermal cycling. |
| Cluster Display Backlight Driver | Body Control Module Core Rail |
Use Scenario: Generates stable 5-V rail for TFT-LCD timing controller and LED driver ICs in digital instrument clusters. IC Role / Device Role / Timing Role: Fixed-output 5-V buck converter with PGOOD monitoring for system power sequencing and fault reporting. Use Value: 7-µA quiescent current extends battery life during vehicle sleep mode; FPWM mode prevents audible coil whine. | Use Scenario: Provides regulated 3.3-V supply for microcontrollers, CAN transceivers, and sensor interfaces in door modules and seat controllers. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting multiple voltage variants across platform derivatives. Use Value: Pin compatibility with LM61440-Q1/LM61460-Q1 enables scalable BOM management and layout reuse across 3-A to 6-A designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61440APPQRJRRQ1 | Same 36-V/4-A rating but with adjustable switching frequency (200 kHz–2.2 MHz); lacks factory 2.1-MHz option | Better suited for designs requiring frequency tuning to avoid sensitive bands or optimize efficiency at light loads | Select when programmable fSW is required; not drop-in due to different default frequency behavior |
| LM62440BPPQRJRRQ1 | Identical package and pinout; factory-trimmed for fixed 3.3-V output instead of adjustable VOUT | Used where 3.3-V rail is needed without external feedback resistors-reducing BOM count and layout complexity | Choose for simplified 3.3-V designs; shares same thermal and EMI performance but differs in output configuration |
Compared with LM61440APPQRJRRQ1, the LM62440APPQRJRRQ1 offers guaranteed 2.1-MHz operation for smaller passive size, while versus LM62440BPPQRJRRQ1 it provides output voltage flexibility at the cost of two external resistors-making it optimal for multi-rail platforms needing both 3.3 V and 5 V variants.
Availability
LM62440APPQRJRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital cluster displays requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LM62440APPQRJRRQ1 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 ICs, with decades of automotive qualification expertise and broad power management portfolio.
The LM62440-Q1 product line delivers high-efficiency, low-EMI DC-DC conversion for demanding automotive subsystems-including infotainment, ADAS, and body electronics-where reliability, thermal robustness, and regulatory compliance are non-negotiable.
FAQ
What is the switching frequency configuration of the LM62440APPQRJRRQ1?
The LM62440APPQRJRRQ1 is factory-configured for a fixed 2.1-MHz switching frequency. This setting is not adjustable via external components or SYNC pin; it is hard-coded in silicon to ensure consistent EMI performance and small solution size. The device does not support user-programmable frequency tuning like its LM61440-Q1 counterpart, making it ideal for designs prioritizing layout simplicity and repeatable noise behavior. LM62440APPQRJRRQ1 maintains this frequency across all operating conditions unless forced into frequency foldback during very light loads in Auto mode.
Does the LM62440APPQRJRRQ1 support spread spectrum modulation?
Yes, the LM62440APPQRJRRQ1 supports pseudorandom spread spectrum modulation to reduce peak conducted EMI emissions by ±2% around its 2.1-MHz center frequency. Spread spectrum is enabled or disabled via the MODE/SYNC pin voltage level-typically set using a resistor divider-and operates only in PWM mode. This feature is confirmed in the official datasheet (SNVSAW8E) and contributes directly to meeting CISPR 25 Class 5 requirements without additional filtering. LM62440APPQRJRRQ1 implements this function internally with no external components required.
What is the maximum input voltage tolerance for the LM62440APPQRJRRQ1 during load dump events?
The LM62440APPQRJRRQ1 supports 42-V input voltage tolerance for durations up to 400 ms, fully compliant with ISO 7637-2 Pulse 5a load dump requirements for 12-V automotive systems. This capability is achieved through robust internal FETs and gate drive design-not external TVS clamping-allowing direct connection to the vehicle battery rail without additional protection circuitry in most implementations. The absolute maximum rating for VIN1/VIN2 is 42 V, and operation above this level risks permanent damage. LM62440APPQRJRRQ1 sustains this stress while maintaining regulation and thermal safety within its AEC-Q100 Grade 1 envelope.
How does the LM62440APPQRJRRQ1 achieve ultra-low EMI performance?
The LM62440APPQRJRRQ1 achieves ultra-low EMI through four co-engineered features: (1) HotRod™ VQFN-HR package minimizing switch-node parasitic inductance, (2) dual parallel VIN inputs reducing input loop area, (3) integrated spread spectrum modulation, and (4) adjustable SW node rise time via RBOOT resistor. These are not optional add-ons but intrinsic to the silicon and package design. Layout best practices-such as tight PGND connections and minimized SW trace length-are still required, but LM62440APPQRJRRQ1 significantly reduces sensitivity to board-level imperfections compared to conventional QFN buck converters.
Is the LM62440APPQRJRRQ1 pin-compatible with other devices in the LM62440-Q1 family?
Yes, the LM62440APPQRJRRQ1 is pin-compatible with LM62440BPPQRJRRQ1 (3.3-V fixed), LM62440CPPQRJRRQ1 (5-V fixed), and LM62440ALPQRJRRQ1 (adjustable, 400-kHz option), all sharing the identical 14-pin VQFN-HR (RJR) footprint and pinout. However, it is not pin-compatible with LM61440-Q1 or LM61460-Q1 despite marketing language suggesting scalability-their EN, MODE/SYNC, and FB configurations differ in timing and biasing requirements. LM62440APPQRJRRQ1 can be substituted among its own 2.1-MHz variants without PCB changes, but cross-family swaps require schematic and layout validation.
LM62440APPQRJRRQ1 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)
LM62440APPQRJRRQ1 FAQ
1.How can I place an order for LM62440APPQRJRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM62440APPQRJRRQ1 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 LM62440APPQRJRRQ1 reliable?
The price and inventory of LM62440APPQRJRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM62440APPQRJRRQ1 is usually 5 days.
3.What payment methods are accepted for LM62440APPQRJRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM62440APPQRJRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM62440APPQRJRRQ1?
LM62440APPQRJRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM62440APPQRJRRQ1 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 LM62440APPQRJRRQ1?
For technical support, including LM62440APPQRJRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM62440APPQRJRRQ1 requirements.
6.How does Aetrix verify that LM62440APPQRJRRQ1 is sourced from the original manufacturer or authorized distributors?
All LM62440APPQRJRRQ1 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 LM62440APPQRJRRQ1 meets industry standards.
7.What is the process for return or replacement of LM62440APPQRJRRQ1?
All LM62440APPQRJRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM62440APPQRJRRQ1, 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 LM62440APPQRJRRQ1 part is unused and in its original packaging.
Return procedure for LM62440APPQRJRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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