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Texas Instruments LMQ62440APPQRJRRQ1
- Part No.:
- LMQ62440APPQRJRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
LMQ62440APPQRJRRQ1.pdf
- Description:
- IC REG BUCK ADJ 4A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:321
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Product details
Overview
LMQ62440APPQRJRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 4 A output current across a 3-V to 36-V input range, featuring integrated high-side (41 mΩ) and low-side (21 mΩ) MOSFETs, 2.1-MHz fixed switching frequency, and support for 42-V load dump transients - deployed in automotive infotainment head units and ADAS power rails.
For engineers reviewing the LMQ62440APPQRJRRQ1 datasheet, LMQ62440APPQRJRRQ1 pinout, LMQ62440APPQRJRRQ1 application, or LMQ62440APPQRJRRQ1 equivalent, key selection considerations include its ultra-low EMI design (CISPR-25 Class 5 compliant), adjustable SW node rise time via RBOOT, internal bypass capacitors, spread-spectrum operation, and VQFN-HR 14-pin wettable-flank package with dual VIN/PGND inputs for parasitic inductance reduction.
Technical Context
The LMQ62440APPQRJRRQ1 implements a pseudo-random spread-spectrum modulator synchronized to its 2.1-MHz nominal switching frequency, reducing peak EMI emissions while maintaining tight regulation. Its dual-input VIN1/VIN2 and dual-PGND1/PGND2 architecture minimizes loop inductance, and the HotRod™-derived VQFN-HR package suppresses switch-node ringing.
Auto-mode enables seamless PWM-to-PFM transition with 7-µA no-load quiescent current and 90% efficiency at 1-mA load; soft-recovery-from-dropout prevents output overshoot during line transients. The device supports external bias (BIAS pin) for improved light-load efficiency and includes integrated thermal shutdown (168°C trip) and hiccup-mode overcurrent protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 36 V continuous; withstands 42-V load dump for 400 ms - ensures robustness in 12-V/24-V automotive systems. |
| Output Current | Up to 4 A DC; supported by low RDS(ON) of 41 mΩ (HS) and 21 mΩ (LS) - enables compact thermal design without external MOSFETs. |
| Switching Frequency | Fixed 2.1 MHz (±10%); synchronizable from 200 kHz to 2.2 MHz - avoids AM band interference and allows small external magnetics. |
| No-Load Quiescent Current | 7 µA typical at 13.5 VIN, 3.3 VOUT in Auto-mode - extends battery life in always-on vehicle modules. |
| EMI Performance | CISPR-25 Class 5 compliant; achieved via integrated bypass caps, parallel input paths, adjustable SW rise time, and spread spectrum - eliminates need for external EMI filters in most layouts. |
| Junction Temperature Range | –40°C to +150°C (Grade 1); qualified per AEC-Q100 - validated for under-hood and dashboard mounting locations. |
| Package | VQFN-HR (14-pin), 4.0 mm × 3.5 mm with wettable flanks - supports automated optical inspection (AOI) and reliable solder joint formation. |
Pinout & Package
VQFN-HR 14-pin package (4.00 mm × 3.50 mm) with wettable flanks, optimized for low-inductance layout and manufacturable solder joints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | External bias supply input | Connects to output rail to power internal LDO; improves light-load efficiency; capacitor to AGND enhances noise immunity. |
| VCC (2) | Internal LDO output | Supplies control circuitry; requires 1-µF decoupling to AGND; not for external loading. |
| AGND (3) | Analog ground reference | Reference point for FB and VCC; must be tied to both PGND1 and PGND2 on PCB to minimize noise coupling. |
| FB (4) | Feedback voltage sense | Connects to resistor divider tap; sets output voltage in adjustable configurations; input bias current <10 nA enables high-impedance dividers. |
| PGOOD (5) | Open-drain power-good status | Asserts high when output is within ±3% regulation; pulls low during fault or EN deactivation; supports system sequencing. |
| MODE/SYNC (6) | Operation mode and clock sync | Selects Auto/FPWM modes or external synchronization; controls spread-spectrum enable/disable via resistive divider or voltage level. |
| EN (7) | Precision enable input | Active-high with 1.263-V threshold and 24–32% hysteresis; supports adjustable UVLO using external resistor divider. |
| VIN1 (8), VIN2 (12) | Dual input power rails | Parallel high-current inputs reduce trace inductance; each requires local high-quality bypass capacitor to respective PGND. |
| PGND1 (9), PGND2 (11) | Dual power ground returns | Low-impedance paths for low-side MOSFET; must be connected together near device with minimal loop area. |
| SW (10) | Switch node | Connects to output inductor; features adjustable rise time via RBOOT/CBOOT network to balance EMI vs. efficiency. |
| RBOOT (13) | SW rise-time control | Resistor between RBOOT and CBOOT sets dV/dt of SW node; 0 Ω → 2.15 ns (10–80%), 100 Ω → 2.7 ns - fine-tunes EMI profile. |
| CBOOT (14) | Bootstrap capacitor connection | 100-nF capacitor between CBOOT and SW powers high-side gate driver; internal diode charges CBOOT during low-SW phase. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low EMI architecture | Meets CISPR-25 Class 5 without external filters via integrated bypass caps, parallel VIN paths, and spread-spectrum modulation. |
| Automotive-grade reliability | AEC-Q100 Grade 1 qualified (–40°C to +150°C TJ) with 42-V load dump tolerance - suitable for engine bay and front-end applications. |
| Adaptive light-load efficiency | 7-µA quiescent current and Auto-mode PFM/PWM transition deliver >90% efficiency at 1-mA load - critical for always-on ECUs. |
| Adjustable SW node dynamics | RBOOT pin enables precise tuning of switch-node rise time (2.15–2.7 ns) to optimize EMI-efficiency trade-off without layout changes. |
| Robust protection suite | Includes hiccup-mode overcurrent, thermal shutdown (168°C), input UVLO, and PGOOD monitoring - reduces need for external supervision. |
Applications
| Infotainment Head Unit Power | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powers SoC, display interface, and USB charging circuits in automotive head units operating from 12-V battery with cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Primary 5-V or 3.3-V step-down regulator delivering 4-A peak current with fast transient response and ultra-low conducted EMI. Use Value: Eliminates need for external EMI filters and discrete MOSFETs, reducing BOM count and board space while meeting OEM EMC requirements. |
Use Scenario: Supplies image sensor, ISP, and serializer in forward-facing ADAS cameras exposed to under-hood temperature extremes. IC Role / Device Role / Timing Role: High-reliability 3.3-V buck converter with –40°C to +150°C operation and soft-dropout recovery to prevent camera reset during voltage sags. Use Value: Maintains stable output during 42-V load dump events and achieves <7-µA quiescent current in sleep mode - extending parking-mode runtime. |
| Body Control Module (BCM) Core Rail | Cluster Display Backlight Driver Bias |
|
Use Scenario: Generates 3.3-V core rail for microcontroller and CAN transceivers in body electronics modules located near door latches or trunk compartments. IC Role / Device Role / Timing Role: Automotive-qualified synchronous buck with precision enable (VEN = 1.263 V) enabling controlled power-up sequencing and wake-from-sleep capability. Use Value: Integrates high- and low-side MOSFETs plus internal LDO, reducing component count versus discrete solutions while ensuring AEC-Q100 compliance. |
Use Scenario: Provides stable 5-V bias supply for LED backlight drivers in digital instrument clusters subject to wide ambient temperature swings and vibration. IC Role / Device Role / Timing Role: Low-noise, low-ripple 5-V regulator with PGOOD signaling to enable backlight dimming logic only after stable voltage is established. Use Value: Internal spread spectrum and optimized pinout suppress radiated emissions that could interfere with cluster's TFT timing signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ62440BPPQRJRRQ1 | Factory-trimmed for fixed 3.3-V output; identical pinout, package, and EMI features. | Eliminates external feedback resistors; suited for cost-sensitive 3.3-V-only designs without output adjustability. | Select when fixed 3.3-V output suffices and board space for feedback network must be minimized. |
| LMQ62440CPPQRJRRQ1 | Factory-trimmed for fixed 5-V output; shares same thermal and EMI performance as LMQ62440APPQRJRRQ1. | Reduces design validation effort for 5-V systems; removes need for FB divider calibration and stability analysis. | Choose for 5-V applications where guaranteed initial accuracy (±1%) and reduced BOM complexity outweigh adjustable-output flexibility. |
Compared with LMQ62440BPPQRJRRQ1 and LMQ62440CPPQRJRRQ1, the LMQ62440APPQRJRRQ1 provides full output adjustability via external feedback resistors - essential for designs requiring non-standard voltages or dynamic voltage scaling, while retaining identical thermal, EMI, and automotive qualification profiles.
Availability
LMQ62440APPQRJRRQ1 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 high-reliability environments.
Supply support for LMQ62440APPQRJRRQ1 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 experience in high-reliability power management solutions.
The LMQ62440-Q1 product line delivers automotive-grade synchronous buck converters optimized for ultra-low EMI, high efficiency across load range, and rugged operation in harsh vehicle environments - targeting infotainment, ADAS, and body electronics.
FAQ
What is the maximum input voltage the LMQ62440APPQRJRRQ1 can withstand during load dump conditions?
The LMQ62440APPQRJRRQ1 supports 42-V input transients for durations up to 400 ms, satisfying ISO 7637-2 and SAE J1113-11 load dump requirements for 12-V automotive systems. This rating is specified in absolute maximum ratings and verified per AEC-Q100 stress testing - ensuring reliable operation during alternator disconnection events without external clamping components.
Does the LMQ62440APPQRJRRQ1 require external MOSFETs or diodes?
No, the LMQ62440APPQRJRRQ1 integrates both high-side and low-side power MOSFETs (RDS(ON) = 41 mΩ HS / 21 mΩ LS), bootstrap circuitry, internal LDO, and feedback error amplifier - eliminating need for external power switches, catch diodes, or gate drivers. Only external passive components (inductor, input/output capacitors, feedback resistors) are required for full operation.
How does the MODE/SYNC pin configure spread-spectrum operation on the LMQ62440APPQRJRRQ1?
The MODE/SYNC pin enables spread-spectrum modulation via resistive divider: connecting it to AGND through ≤6-kΩ resistor activates spread spectrum, while ≥30-kΩ disables it. Voltage-level control is also supported - below 2.5 V enables spread spectrum, above 4.9 V disables it. This configuration is retained after startup and does not require continuous driving.
What is the purpose of the dual VIN and dual PGND pins on the LMQ62440APPQRJRRQ1?
VIN1/VIN2 and PGND1/PGND2 provide parallel high-current paths to minimize parasitic inductance in the power loop. Separating input and ground returns reduces voltage spikes during switching transitions and improves EMI performance - especially critical for meeting CISPR-25 Class 5. Each VIN pin requires its own local bypass capacitor to its adjacent PGND pin.
Can the LMQ62440APPQRJRRQ1 operate with an input voltage below 3.0 V?
No - the LMQ62440APPQRJRRQ1 has a minimum operating input voltage of 3.0 V after startup (VVIN_MIN1), and requires ≥3.95 V to sustain full 4-A output capability. Below 3.0 V, the device ceases regulation and enters undervoltage lockout; startup is not guaranteed below 3.95 V even at light loads. This is defined in Section 7.3 Recommended Operating Conditions.
LMQ62440APPQRJRRQ1 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:
- 2.1MHz
- 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)
LMQ62440APPQRJRRQ1 FAQ
1.How can I place an order for LMQ62440APPQRJRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMQ62440APPQRJRRQ1 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 LMQ62440APPQRJRRQ1 reliable?
The price and inventory of LMQ62440APPQRJRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMQ62440APPQRJRRQ1 is usually 5 days.
3.What payment methods are accepted for LMQ62440APPQRJRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMQ62440APPQRJRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMQ62440APPQRJRRQ1?
LMQ62440APPQRJRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMQ62440APPQRJRRQ1 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 LMQ62440APPQRJRRQ1?
For technical support, including LMQ62440APPQRJRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMQ62440APPQRJRRQ1 requirements.
6.How does Aetrix verify that LMQ62440APPQRJRRQ1 is sourced from the original manufacturer or authorized distributors?
All LMQ62440APPQRJRRQ1 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 LMQ62440APPQRJRRQ1 meets industry standards.
7.What is the process for return or replacement of LMQ62440APPQRJRRQ1?
All LMQ62440APPQRJRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMQ62440APPQRJRRQ1, 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 LMQ62440APPQRJRRQ1 part is unused and in its original packaging.
Return procedure for LMQ62440APPQRJRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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