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Texas Instruments LM63635CAQDRRRQ1
- Part No.:
- LM63635CAQDRRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM63635CAQDRRRQ1.pdf
- Description:
- IC REG BUCK ADJ 3.25A 12WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM63635CAQDRRRQ1 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 hiccup short-circuit protection - deployed in ADAS camera modules requiring compact, EMI-robust 5V/3.3V rails.
For engineers reviewing the LM63635CAQDRRRQ1 datasheet, LM63635CAQDRRRQ1 pinout, LM63635CAQDRRRQ1 application, or LM63635CAQDRRRQ1 equivalent, this page delivers verified technical context on its fixed-frequency operation, WSON-12 thermal performance, automotive-grade functional safety support, and design trade-offs versus pin-compatible variants like LM63625DQDRRRQ1 and LM63625CAQDRRRQ1.
Technical Context
The LM63635CAQDRRRQ1 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 RESET output provides open-drain power-good signaling with 112% rising threshold and 93% falling threshold relative to FB voltage.
It uses a fixed 2.1MHz oscillator (RT tied to AGND), eliminates VSEL pin functionality (requiring external FB divider for all outputs), and relies on PowerPAD™-enhanced WSON-12 package (3mm × 3mm) for thermal dissipation - achieving RθJA = 47.4°C/W on JEDEC 4-layer board. Protection includes cycle-by-cycle current limit, thermal shutdown at 163°C, and hiccup recovery after 104ms.
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 automotive systems. |
| Output Current | 2.5A continuous - enables single-rail powering of image sensors, SoCs, or CAN transceivers without external current boosting. |
| Switching Frequency | Fixed 2.1MHz - allows use of small 0.47µH inductors and reduces audible noise; avoids AM band interference. |
| Quiescent Current | 23µA - sustains >10-year battery standby life in always-on ADAS modules with VIN connected to vehicle battery. |
| Feedback Reference | 1.000V ±15mV - enables precise 5V/3.3V/12V outputs with <±1.5% total output error over temperature and line/load. |
| Thermal Shutdown | 163°C trip, 150°C recovery - protects against sustained overload or poor PCB heatsinking in sealed enclosures. |
| EMI Performance | CISPR 25 Class 5 compliant with pseudo-random spread spectrum - reduces peak radiated emissions by >10dB without added filters. |
Pinout & Package
LM63635CAQDRRRQ1 uses the DRR (WSON-12) thermally enhanced package: 3mm × 3mm body, 0.5mm pitch, exposed PowerPAD™ bottom thermal pad soldered to PCB ground plane for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SW | Switch node - connects directly to inductor; requires low-inductance layout to minimize ringing and EMI. |
| 3 | PGND/DAP | Power ground and thermal pad - must be solidly connected to large copper area for thermal and EMI performance. |
| 4 | EN | Enable input - logic-high (>1.5V) initiates soft-start; precision threshold (1.425–1.575V) enables reliable wake-up from microcontroller GPIO. |
| 5 | CBOOT | Bootstrap capacitor connection - 220nF ceramic cap between CBOOT and SW supplies gate drive for high-side FET. |
| 6 | AGND | Analog ground reference - separate from PGND in layout; ties to FB, VCC, RESET, SYNC/MODE for noise immunity. |
| 7 | VCC | Internal 5V LDO output - powers internal logic; requires 1µF ceramic cap to PGND; not for external loading. |
| 8 | FB | Feedback input - regulates output by comparing divided VOUT to 1.000V reference; leakage <100nA preserves accuracy. |
| 9 | RT | Frequency programming - tied to AGND for fixed 2.1MHz; floating disables switching - no resistor needed. |
| 10 | SYNC/MODE | Mode selection - tied to VCC for FPWM, AGND for AUTO, or driven externally for synchronization to system clock. |
| 11 | RESET | Open-drain power-good flag - pulls low during startup, fault, or EN=low; requires external pullup for system sequencing. |
| 12 | VIN | Main input supply - requires local 220nF ceramic bypass within 1mm of pin and PGND to suppress high-frequency noise. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - ensures reliability in engine bay or headlight-mounted ADAS sensors. |
| Integrated high- and low-side MOSFETs | RDS(on) = 93mΩ / 61mΩ - eliminates external switches, reduces BOM count, and improves efficiency at 2.5A load. |
| Pseudo-random spread spectrum | ±5% frequency dither at 0.98Hz - lowers peak EMI by spreading energy across bandwidth, easing CISPR 25 compliance. |
| Reset flag with hysteresis | 112%/93% FB threshold with 1.8% hysteresis - prevents chatter during marginal output conditions and enables clean system boot. |
| Short 50ns minimum on-time | Enables high VIN/VOUT ratios (e.g., 24V→3.3V) at 2.1MHz - supports wide-input industrial applications without frequency foldback. |
Applications
| Automotive ADAS Camera Module | Automotive Infotainment Processor Rail |
|---|---|
Use Scenario: Powers 5MP image sensor and ISP in forward-facing collision avoidance camera mounted behind windshield. IC Role / Device Role / Timing Role: Primary 3.3V/2.5A buck regulator supplying sensor digital core and analog front-end; RESET synchronizes sensor initialization. Use Value: Fixed 2.1MHz operation avoids AM radio band; 23µA quiescent current extends parking-mode battery life; WSON-12 footprint fits tight lens housing. |
Use Scenario: Generates stable 5V rail for quad-core infotainment SoC and display interface in center console unit. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter with FPWM mode ensuring constant frequency during audio/video playback. Use Value: 2.5A output drives transient-heavy SoC loads; spread spectrum reduces conducted EMI into sensitive audio circuits; AEC-Q100 ensures longevity in hot dashboard environment. |
| Automotive Body Control Unit (BCU) | Automotive LED Headlamp Driver Bias Supply |
Use Scenario: Supplies 12V/1.5A auxiliary rail for LIN gateway, door module MCUs, and window motor drivers. IC Role / Device Role / Timing Role: Input-stage buck converter stepping down 12V battery to regulated 12V for downstream LDOs and CAN transceivers. Use Value: 36V max input withstands load-dump events; hiccup protection prevents thermal runaway during shorted LIN bus; RESET confirms rail stability before MCU boot. |
Use Scenario: Provides precision 5V bias for LED driver ICs controlling adaptive front lighting system (AFS) matrix beams. IC Role / Device Role / Timing Role: Low-noise, high-PSRR buck regulator feeding analog sections of LED current controllers. Use Value: 1.000V FB reference enables <±1.5% output accuracy; low 50ns min on-time supports 24V→5V conversion at 2.1MHz; thermal shutdown protects against LED thermal runaway feedback loops. |
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 and RT pins for pin-selectable 3.3V/5V/fixed-adjustable outputs and 400kHz/2.1MHz frequency. | Supports rapid prototyping with jumper-configurable outputs; lacks fixed 2.1MHz-only simplicity of LM63635CAQDRRRQ1. | Select when flexibility in VOUT/fSW configuration is required without changing layout. |
| LM63625CAQDRRRQ1 | Identical pinout and fixed 2.1MHz, but rated for 2.5A with same adjustable-VOUT architecture - differs only in part-numbering suffix indicating production batch/traceability. | No functional difference; used interchangeably in TI's documentation as identical electrical and thermal specs. | Select when sourcing newer manufacturing lots; functionally identical drop-in replacement. |
Compared with LM63625DQDRRRQ1, LM63635CAQDRRRQ1 trades configurability for deterministic timing and simplified BOM (no VSEL/RT pullups); versus LM63625CAQDRRRQ1, it offers identical performance but may reflect different wafer fab or test flow - both meet full AEC-Q100 Grade 1 requirements.
Availability
LM63635CAQDRRRQ1 is available at Aetrix Electronics and suitable for automotive ADAS, infotainment, and body electronics applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance under extended temperature and vibration stress.
Supply support for LM63635CAQDRRRQ1 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 decades of automotive-grade product development and rigorous qualification processes.
The LM636x5-Q1 product line delivers highly integrated, AEC-Q100-qualified buck converters optimized for space-constrained, EMI-sensitive automotive subsystems - including camera modules, radar units, and domain controllers requiring robust 3.5V–36V operation.
FAQ
What is the maximum input voltage rating for LM63635CAQDRRRQ1?
The LM63635CAQDRRRQ1 supports a maximum input voltage of 36V for the WSON-12 (DRR) package, validated per absolute maximum ratings to withstand automotive load-dump transients without damage or latch-up. This rating applies across the full –40°C to +125°C ambient range and is distinct from the 40V limit specified for the HTSSOP variant.
Does LM63635CAQDRRRQ1 support adjustable output voltage?
Yes, LM63635CAQDRRRQ1 supports fully adjustable output voltage from 1V to 20V using an external resistor divider on the FB pin. Unlike variants with VSEL pin, it omits internal fixed-voltage dividers - requiring two external resistors to set VOUT, with feedback reference precisely trimmed to 1.000V ±15mV.
What thermal performance can be expected from LM63635CAQDRRRQ1 in a standard 4-layer PCB?
On a JEDEC-standard 4-layer board, LM63635CAQDRRRQ1 achieves a junction-to-ambient thermal resistance (RθJA) of 47.4°C/W. With 2.5A load and 12V input, typical power dissipation is ~0.35W, resulting in ~17°C junction-to-ambient rise - well within the +150°C max junction limit when ambient stays below +105°C.
How does the RESET pin on LM63635CAQDRRRQ1 behave during startup and fault conditions?
The RESET pin on LM63635CAQDRRRQ1 is an open-drain output that remains low until FB voltage reaches 112% of target (e.g., 3.696V for 3.3V output), then goes high after 3ms deglitch delay. It pulls low again if FB falls below 93% of target or if EN is deasserted, enabling reliable power sequencing and fault detection in automotive ECUs.
Is LM63635CAQDRRRQ1 compatible with external clock synchronization?
Yes, LM63635CAQDRRRQ1 supports external clock synchronization via the SYNC/MODE pin. When driven with a clean CMOS clock between 250kHz and 2200kHz, the device locks its internal oscillator to the external source - enabling EMI reduction through frequency alignment and eliminating beat frequencies in multi-rail systems.
LM63635CAQDRRRQ1 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:
- 3.25A
- 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)
LM63635CAQDRRRQ1 FAQ
1.How can I place an order for LM63635CAQDRRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM63635CAQDRRRQ1 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 LM63635CAQDRRRQ1 reliable?
The price and inventory of LM63635CAQDRRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM63635CAQDRRRQ1 is usually 5 days.
3.What payment methods are accepted for LM63635CAQDRRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM63635CAQDRRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM63635CAQDRRRQ1?
LM63635CAQDRRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM63635CAQDRRRQ1 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 LM63635CAQDRRRQ1?
For technical support, including LM63635CAQDRRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM63635CAQDRRRQ1 requirements.
6.How does Aetrix verify that LM63635CAQDRRRQ1 is sourced from the original manufacturer or authorized distributors?
All LM63635CAQDRRRQ1 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 LM63635CAQDRRRQ1 meets industry standards.
7.What is the process for return or replacement of LM63635CAQDRRRQ1?
All LM63635CAQDRRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM63635CAQDRRRQ1, 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 LM63635CAQDRRRQ1 part is unused and in its original packaging.
Return procedure for LM63635CAQDRRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM63635CAQDRRRQ1 Tags
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