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Texas Instruments LM63635CC3QDRRRQ1
- Part No.:
- LM63635CC3QDRRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM63635CC3QDRRRQ1.pdf
- Description:
- IC REG BUCK 3.3V 3.25A 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
LM63635CC3QDRRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 3.25A output at fixed 3.3V from 3.5V–36V input, featuring 2.1MHz fixed switching frequency, 50ns minimum on-time, and 23µA quiescent current - deployed in infotainment power rails requiring compact, EMI-compliant, high-reliability regulation.
For engineers reviewing the LM63635CC3QDRRRQ1 datasheet, LM63635CC3QDRRRQ1 pinout, LM63635CC3QDRRRQ1 application, or LM63635CC3QDRRRQ1 equivalent, key selection criteria include its WSON-12 package thermal performance (RθJC(bot) = 6.3°C/W), precision enable thresholds (VEN-H = 1.5V ±75mV), RESET flag timing (tRISE-DELAY = 2–5ms), and spread-spectrum EMI compliance per CISPR 25 Class 5.
Technical Context
The LM63635CC3QDRRRQ1 implements peak-current-mode control with automatic PFM/PWM mode transition, enabling high light-load efficiency while maintaining tight regulation across –40°C to +125°C ambient. Its integrated 3.3V feedback divider eliminates external resistors, and internal compensation reduces BOM count versus externally compensated buck controllers.
It supports forced PWM (FPWM) via SYNC/MODE tied to VCC, AUTO mode when grounded, or external synchronization up to 2.2MHz. Protection includes hiccup-mode short-circuit response (NOC = 128 cycles), thermal shutdown (TSD = 163°C), and cycle-by-cycle current limiting (ISC = 4.4A typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports full automotive battery range including cold-crank (4.5V) and load-dump (36V) transients without external protection. |
| Output Voltage | Fixed 3.3V ±1.5% - internally trimmed; no external feedback resistors required, reducing layout sensitivity and noise pickup. |
| Max Output Current | 3.25A continuous - delivered in thermally optimized WSON-12 package with exposed DAP for PCB heat sinking. |
| Switching Frequency | Fixed 2.1MHz (±12.5%) - enables use of small 0.47µH inductors and avoids AM/FM radio bands; supports spread spectrum (±5%). |
| Quiescent Current | 23µA typical - sustains low-power always-on domains (e.g., CAN wake-up circuits) without draining battery. |
| Min On-Time | 50ns - enables high step-down ratios (e.g., 24V→3.3V at 2.1MHz) without pulse-skipping instability. |
| RESET Flag Accuracy | VRESET-HIGH = 112% of VFB, hysteresis = 1.8% - provides precise power-good signaling for microcontroller reset sequencing. |
Pinout & Package
LM63635CC3QDRRRQ1 uses a 3.00mm × 3.00mm WSON-12 package with PowerPAD™ (DRR0012), where Pin 13 (PGND/DAP) is electrically connected to the exposed thermal pad for low-impedance ground and heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Connects to inductor; carries high di/dt switching current - requires short, wide copper pour to minimize EMI and voltage spikes. |
| CBOOT | Bootstrap supply | Supplies gate drive for high-side MOSFET; requires 220nF ceramic capacitor placed adjacent to SW and CBOOT pins. |
| VIN | Main input supply | Accepts 3.5V–36V; bypassed with low-ESR capacitor directly to PGND to suppress input ripple and transients. |
| EN | Enable control | Precision threshold (VEN-H = 1.5V ±75mV); supports adjustable UVLO using external resistor divider. |
| SYNC/MODE | Mode selection | Tie to VCC for FPWM, AGND for AUTO, or external clock for sync - internal 100kΩ pulldown prevents floating. |
| RESET | Open-drain power-good | Asserts low during startup, fault, or EN deactivation; requires external pullup (10–100kΩ) to logic rail. |
| FB | Feedback input | Internally connected to 3.3V divider; must not be floated or grounded - connects directly to output capacitor. |
| PGND/DAP | Power ground & thermal pad | Primary return path for high-current loops; soldered to large PCB ground plane for RθJC(bot) = 6.3°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive reliability and stress-test requirements for body and infotainment systems. |
| Integrated 3.3V feedback network | Eliminates two external resistors and associated layout parasitics - improves accuracy, reduces board area, and enhances noise immunity. |
| Pseudo-random spread spectrum | ±5% frequency dither at 0.98Hz - spreads EMI energy across FM band (76–108MHz), easing CISPR 25 Class 5 compliance without added filtering. |
| Automatic frequency foldback | Reduces switching frequency under light load while maintaining regulation - improves efficiency below 100mA without sacrificing transient response. |
| Hiccup short-circuit protection | Enters 104ms retry delay after 128 consecutive current-limit events - limits average power dissipation during sustained overload or output short. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC, display interface, and audio codec in head-unit systems with variable input (9–16V battery) and strict EMI limits. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying core logic rails; delivers stable output during cold-crank dips and load-dump surges. Use Value: 50ns min on-time ensures regulation at 24V→3.3V conversion; spread spectrum avoids FM-band interference with embedded radio receivers. | Use Scenario: Supplies image sensor and ISP in forward-facing camera modules where size, thermal margin, and startup sequencing are critical. IC Role / Device Role / Timing Role: Compact 3.3V source with integrated RESET flag for synchronized processor boot and fault reporting. Use Value: WSON-12 footprint (3×3mm) fits tight camera PCBs; tRISE-DELAY = 3ms enables reliable MCU reset assertion after soft-start completion. |
| Body Control Module (BCM) Core Rail | Automotive Lighting Driver Bias |
Use Scenario: Provides 3.3V for microcontroller, CAN transceiver, and I/O expanders in door module or seat control units. IC Role / Device Role / Timing Role: Always-on regulator supporting low-quiescent sleep modes; precision enable allows controlled wake-up from vehicle bus activity. Use Value: 23µA IQ extends battery life in parked state; VEN-L = 0.94V enables accurate undervoltage detection before system brownout. | Use Scenario: Generates bias voltage for LED driver ICs in adaptive front-lighting systems (AFS) requiring stable 3.3V reference under engine noise. IC Role / Device Role / Timing Role: Secondary regulated supply decoupled from main 12V lighting rail; immune to PWM dimming transients due to fast load-step response. Use Value: Peak-current-mode control achieves <10µs transient recovery; RDS-ON(HS) = 93mΩ minimizes dropout at 2A load during cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM63635CA3QDRRRQ1 | Same WSON-12 package and 3.3V output, but fixed 400kHz switching frequency - higher inductor size, lower EMI at fundamental, reduced light-load efficiency. | Better suited for cost-sensitive body electronics where board space is less constrained and EMI filtering is prioritized over miniaturization. | Select when 400kHz operation simplifies EMI filter design or when lower switching losses at medium loads outweigh 2.1MHz size benefits. |
| TPS62933QRGXRQ1 | 3.3V, 3.5A, 2.25MHz buck with lower IQ (15µA), but no integrated spread spectrum or RESET flag - requires external monitoring circuitry. | Targeted at ultra-low-power ADAS sensors where quiescent current dominates lifetime battery drain, and discrete fault signaling is acceptable. | Choose when minimizing standby current is paramount and system-level power sequencing can replace dedicated RESET functionality. |
Compared with LM63635CA3QDRRRQ1 and TPS62933QRGXRQ1, the LM63635CC3QDRRRQ1 uniquely combines 2.1MHz operation, built-in spread spectrum, and a precision RESET flag in a single WSON-12 package - making it optimal for space-constrained, EMI-sensitive automotive infotainment and camera power designs requiring robust system-level sequencing.
Availability
LM63635CC3QDRRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control units requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.
Supply support for LM63635CC3QDRRRQ1 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 decades of automotive qualification expertise.
The LM63635C-Q1 product line delivers highly integrated, AEC-Q100-qualified buck converters for next-generation automotive subsystems - designed to simplify power design in infotainment, ADAS, and body electronics while meeting stringent EMI, thermal, and functional safety requirements.
FAQ
What is the maximum junction temperature rating for the LM63635CC3QDRRRQ1?
The LM63635CC3QDRRRQ1 has a maximum junction temperature (TJ) of +150°C, with thermal shutdown triggered at 163°C (typical) and recovery at 150°C. This rating supports operation in under-hood and dashboard environments where ambient temperatures reach +125°C, provided PCB thermal design maintains RθJA ≤ 47.4°C/W per JEDEC 4-layer board conditions. The WSON-12 PowerPAD™ enables direct thermal coupling to the PCB ground plane.
Does the LM63635CC3QDRRRQ1 require external feedback resistors for its 3.3V output?
No, the LM63635CC3QDRRRQ1 does not require external feedback resistors. It integrates a precision 3.3V feedback divider internally, with VFB_3p3V = 3.3V ±0.05V (3.25V–3.35V). This eliminates two external components, reduces layout sensitivity to noise, and improves output accuracy across temperature - a key differentiator from adjustable-output buck regulators like the LM63625QDRRRQ1.
How does the spread spectrum feature of the LM63635CC3QDRRRQ1 improve EMI performance?
The LM63635CC3QDRRRQ1 uses pseudo-random spread spectrum with ±5% frequency modulation at 0.98Hz to distribute switching energy across a wider bandwidth. This reduces peak emissions in the FM band (76–108MHz), helping systems meet CISPR 25 Class 5 conducted and radiated emission limits without adding ferrite beads or complex LC filters - particularly valuable in densely packed infotainment head-units where board space is constrained.
What is the purpose of the CBOOT pin on the LM63635CC3QDRRRQ1, and what capacitor value is required?
The CBOOT pin on the LM63635CC3QDRRRQ1 supplies the gate drive voltage for the internal high-side MOSFET. It requires a 220nF X7R ceramic capacitor placed directly between CBOOT and SW pins to maintain sufficient bootstrap charge during each switching cycle. Using a smaller or lower-quality capacitor risks high-side FET turn-off failure, especially at 2.1MHz operation and high duty cycles - TI specifies this value based on worst-case CBOOT discharge modeling across temperature and load.
Can the LM63635CC3QDRRRQ1 operate with a pre-biased output voltage?
Texas Instruments explicitly advises against starting the LM63635CC3QDRRRQ1 with a pre-biased output voltage greater than 1V. Doing so may cause uncontrolled inrush current, latch-up, or damage to internal circuitry during soft-start initialization. The device's reference-based soft-start sequence assumes VOUT = 0V at EN assertion; if pre-bias is unavoidable, external circuitry (e.g., active discharge FET) must ensure VOUT < 1V before enabling the LM63635CC3QDRRRQ1.
LM63635CC3QDRRRQ1 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3.25A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-WSON (3x3)
LM63635CC3QDRRRQ1 FAQ
1.How can I place an order for LM63635CC3QDRRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM63635CC3QDRRRQ1 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 LM63635CC3QDRRRQ1 reliable?
The price and inventory of LM63635CC3QDRRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM63635CC3QDRRRQ1 is usually 5 days.
3.What payment methods are accepted for LM63635CC3QDRRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM63635CC3QDRRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM63635CC3QDRRRQ1?
LM63635CC3QDRRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM63635CC3QDRRRQ1 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 LM63635CC3QDRRRQ1?
For technical support, including LM63635CC3QDRRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM63635CC3QDRRRQ1 requirements.
6.How does Aetrix verify that LM63635CC3QDRRRQ1 is sourced from the original manufacturer or authorized distributors?
All LM63635CC3QDRRRQ1 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 LM63635CC3QDRRRQ1 meets industry standards.
7.What is the process for return or replacement of LM63635CC3QDRRRQ1?
All LM63635CC3QDRRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM63635CC3QDRRRQ1, 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 LM63635CC3QDRRRQ1 part is unused and in its original packaging.
Return procedure for LM63635CC3QDRRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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