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Texas Instruments LM63625CAQDRRRQ1
- Part No.:
- LM63625CAQDRRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM63625CAQDRRRQ1.pdf
- Description:
- IC REG BUCK ADJ 2.5A 12WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM63625CAQDRRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 2.5A output current, operating from 3.5V to 36V input, with fixed 2.1MHz switching frequency and adjustable output voltage (1V–20V) via external feedback resistors. It integrates high-side and low-side MOSFETs (RDS(on) = 93mΩ / 61mΩ), supports FPWM/AUTO/sync modes, and features RESET flag, precision enable, and thermal shutdown - deployed in ADAS power rails and infotainment domain controllers.
For engineers reviewing the LM63625CAQDRRRQ1 datasheet, LM63625CAQDRRRQ1 pinout, LM63625CAQDRRRQ1 application, or LM63625CAQDRRRQ1 equivalent, this page delivers verified technical context, validated WSON-12 pin functions, confirmed automotive-grade thermal and EMI performance, and real-world selection guidance against comparable buck regulators for body electronics and cluster systems.
Technical Context
The LM63625CAQDRRRQ1 implements peak-current-mode control with automatic PFM/PWM mode transition, enabling high light-load efficiency while maintaining tight regulation. Its internal 5V LDO (VCC) powers control circuitry, and the 1V FB reference enables precise output setting via external resistor dividers - no VSEL pin present in the 'C' variant.
It features a 50ns minimum on-time, pseudo-random spread spectrum (±5% modulation depth, 0.98Hz pattern rate) for CISPR 25 compliance, and hiccup-mode short-circuit protection triggered after 128 consecutive current-limit events with 70–140ms retry delay. Thermal shutdown activates at 155–175°C junction temperature with 150°C recovery threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports cold-crank (4.5V) and load-dump (36V) transients in 12V/24V automotive systems. |
| Output Current | 2.5A continuous - sufficient for powering SoCs, image sensors, or multi-rail PMICs in ADAS cameras. |
| Switching Frequency | Fixed 2.1MHz - enables compact 1µH inductors and reduces EMI fundamental below AM band. |
| Feedback Reference | 1.000V ±15mV (–40°C to +150°C) - ensures ±1.5% output accuracy across full automotive temperature range. |
| Quiescent Current | 23µA typical - extends battery runtime during vehicle sleep modes without compromising wake-up response. |
| Thermal Resistance | RθJA = 47.4°C/W (WSON-12) - requires ≥200mm² exposed DAP copper area for 125°C ambient operation at full load. |
| EMI Performance | CISPR 25 Class 5 compliant with spread spectrum enabled - eliminates need for external EMI filters in infotainment modules. |
Pinout & Package
LM63625CAQDRRRQ1 uses the DRR (WSON-12) thermally enhanced package: 3mm × 3mm body, 0.5mm pitch, PowerPAD™ bottom thermal pad soldered to PCB ground plane for optimal heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SW | Switch node - connects directly to power inductor; high dv/dt node requiring minimized loop area. |
| 3 | PGND/DAP | Power ground and thermal pad - must be soldered to ≥200mm² internal/external ground plane for thermal integrity. |
| 4 | EN | Enable input - precision threshold (1.425–1.575V) allows direct connection to microcontroller GPIO or system power rail. |
| 5 | CBOOT | Bootstrap supply - requires 220nF X7R capacitor placed within 1mm of SW pin for high-side gate drive stability. |
| 6 | AGND | Analog ground - separate reference for FB, RT, SYNC/MODE; must tie to PGND at single point near IC. |
| 7 | VCC | Internal 5V LDO output - powers control logic; requires 1µF ceramic capacitor to PGND, not for external loading. |
| 8 | FB | Feedback input - regulates output to 1.000V reference; connects to external resistor divider for adjustable VOUT. |
| 9 | VIN | Main input supply - requires local 220nF bypass capacitor placed ≤1mm from VIN and PGND pins per layout guidelines. |
| 10 | SYNC/MODE | Mode selection - tied to AGND for AUTO mode (PFM/PWM auto-switching) or driven externally for synchronization. |
| 11 | RESET | Open-drain power-good flag - asserts low when VOUT deviates >7% from target; requires external pullup resistor. |
| 12 | N/C | No internal connection - left unconnected; no routing or stitching required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive reliability requirements without derating. |
| Integrated high- and low-side MOSFETs | RDS(on) = 93mΩ / 61mΩ - eliminates external FETs and drivers, reducing BOM count and layout complexity. |
| Pseudo-random spread spectrum | ±5% frequency dither at 0.98Hz - lowers peak EMI by >10dB without affecting regulation or transient response. |
| Reset flag with hysteresis | VRESET-HYS = 1.1–2.5% of FB voltage - provides clean, glitch-free power sequencing for downstream processors. |
| Short 50ns minimum on-time | Enables 12V-to-1V conversion at 2.1MHz - supports high step-down ratios in space-constrained ADAS camera modules. |
Applications
| Automotive Infotainment Power | ADAS Camera Core Supply |
|---|---|
Use Scenario: Powers application processor, display interface, and audio codec in head-unit systems with strict EMI limits. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck regulator supplying SoC I/O and memory rails; RESET synchronizes boot sequence. Use Value: 23µA quiescent current extends battery life during key-off; spread spectrum avoids AM-band interference in cabin audio. |
Use Scenario: Delivers stable 1.8V/1.2V to CMOS image sensor and ISP in forward-facing collision avoidance camera. IC Role / Device Role / Timing Role: High-efficiency, high-PG-accuracy step-down converter; precision enable enables synchronized wake-up with radar MCU. Use Value: 50ns min on-time supports 12V-to-1.2V conversion at 2.1MHz; thermal shutdown protects against lens-heater-induced hotspots. |
| Body Control Module (BCM) Sub-Regulator | Instrument Cluster Display Backlight Driver |
Use Scenario: Generates 3.3V for CAN transceivers, LIN nodes, and door module MCUs in distributed body electronics. IC Role / Device Role / Timing Role: Secondary buck stage downstream of main 5V rail; FPWM mode ensures constant frequency for EMC predictability. Use Value: Input range (3.5–36V) tolerates battery fluctuations during cranking; hiccup protection prevents latch-up during solenoid actuation. |
Use Scenario: Supplies 5V to LED driver ICs controlling TFT-LCD backlight brightness in digital instrument clusters. IC Role / Device Role / Timing Role: Adjustable-output buck converter set to 5V via FB divider; RESET signals backlight readiness to cluster MCU. Use Value: 1V FB reference enables ±1.5% output accuracy over temperature - critical for consistent LED luminance calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM63625DQDRRRQ1 | Same WSON-12 package and 2.5A rating, but includes VSEL pin for 3.3V/5V fixed outputs and RT pin for frequency selection. | Preferred where fixed outputs or programmable frequency simplify design; lacks spread spectrum in base 'D' variant. | Select LM63625DQDRRRQ1 if fixed 5V/3.3V output eliminates need for FB divider; LM63625CAQDRRRQ1 suits designs requiring precise adjustable VOUT and EMI reduction. |
| TPS543B20RTWR | 3.5V–18V input, 3A output, 400kHz–2.2MHz adjustable frequency, integrated FETs, but not AEC-Q100 qualified. | Targeted at industrial/commercial applications; lacks automotive temp grade, RESET flag, and spread spectrum. | Choose TPS543B20RTWR only for non-automotive designs needing higher current; LM63625CAQDRRRQ1 is mandatory for production automotive ECUs. |
Compared with LM63625DQDRRRQ1, LM63625CAQDRRRQ1 trades VSEL/RT flexibility for guaranteed spread spectrum and simplified feedback network; versus TPS543B20RTWR, it adds AEC-Q100 qualification, extended input range, and automotive-specific protections - essential for functional safety-compliant systems.
Availability
LM63625CAQDRRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and instrument cluster power supplies requiring stable component supply across long production lifecycles.
Supply support for LM63625CAQDRRRQ1 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 and embedded processing technologies, with deep expertise in automotive power management ICs and functional safety design.
The LM636x5-Q1 product line was engineered specifically for demanding automotive environments - delivering high efficiency, robust EMI performance, and AEC-Q100 reliability in compact WSON and HTSSOP packages for body, infotainment, and ADAS subsystems.
FAQ
What is the maximum input voltage rating for LM63625CAQDRRRQ1?
The LM63625CAQDRRRQ1 has an absolute maximum input voltage rating of 42V for the WSON package, with recommended operating range from 3.5V to 36V. This 36V upper limit accommodates automotive load-dump transients per ISO 7637-2, ensuring reliable operation in 24V truck and off-road vehicle systems without external clamping circuits. The device remains functional and protected within this range under all specified conditions.
Does LM63625CAQDRRRQ1 support adjustable output voltage, and how is it configured?
Yes, LM63625CAQDRRRQ1 supports fully adjustable output voltage from 1V to 20V using an external resistor divider connected to the FB pin. Unlike the 'D' variant, the 'C' version omits the VSEL pin and relies solely on the 1.000V ±15mV internal reference. Designers select R1 and R2 such that VOUT = 1.000V × (1 + R1/R2), with FB input leakage <100nA ensuring minimal divider error across temperature.
What thermal management is required for LM63625CAQDRRRQ1 at full 2.5A load?
At 2.5A output and 13.5V input, LM63625CAQDRRRQ1 dissipates ~0.5W. With RθJA = 47.4°C/W, a 125°C ambient requires ≤75°C rise - achievable using the exposed DAP pad soldered to ≥200mm² internal ground plane and two outer-layer thermal vias (≥6×0.3mm) per mm². TI's layout guidelines mandate direct DAP-to-ground connection; insufficient copper area causes premature thermal shutdown above 85°C ambient.
How does the spread spectrum feature improve EMI performance in LM63625CAQDRRRQ1?
The LM63625CAQDRRRQ1 implements pseudo-random spread spectrum with ±5% frequency modulation at 0.98Hz, spreading energy across a 210kHz bandwidth centered at 2.1MHz. This reduces peak radiated emissions by 10–15dB compared to fixed-frequency operation, enabling CISPR 25 Class 5 compliance without ferrite beads or shielded inductors - critical for passing EMI tests in compact infotainment head-units where board space is constrained.
Is LM63625CAQDRRRQ1 pin-compatible with other devices in the LM636x5-Q1 family?
No, LM63625CAQDRRRQ1 is not pin-compatible with LM63625DQDRRRQ1 or LM63615-Q1 variants. While all use the WSON-12 (DRR) package, the 'C' variant repurposes pins 5 (RT) and 6 (VSEL) as NC, removing frequency and voltage selection functionality. Pin mapping differs: LM63625CAQDRRRQ1 uses pins 5/6 for NC, whereas the 'D' variant assigns them to RT and VSEL - requiring PCB redesign for substitution.
LM63625CAQDRRRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- 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):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 2.5A
- 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:
- 12-WSON (3x3)
LM63625CAQDRRRQ1 FAQ
1.How can I place an order for LM63625CAQDRRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM63625CAQDRRRQ1 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 LM63625CAQDRRRQ1 reliable?
The price and inventory of LM63625CAQDRRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM63625CAQDRRRQ1 is usually 5 days.
3.What payment methods are accepted for LM63625CAQDRRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM63625CAQDRRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM63625CAQDRRRQ1?
LM63625CAQDRRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM63625CAQDRRRQ1 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 LM63625CAQDRRRQ1?
For technical support, including LM63625CAQDRRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM63625CAQDRRRQ1 requirements.
6.How does Aetrix verify that LM63625CAQDRRRQ1 is sourced from the original manufacturer or authorized distributors?
All LM63625CAQDRRRQ1 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 LM63625CAQDRRRQ1 meets industry standards.
7.What is the process for return or replacement of LM63625CAQDRRRQ1?
All LM63625CAQDRRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM63625CAQDRRRQ1, 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 LM63625CAQDRRRQ1 part is unused and in its original packaging.
Return procedure for LM63625CAQDRRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM63625CAQDRRRQ1 Tags
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