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Texas Instruments LM63635CA3QDRRRQ1
- Part No.:
- LM63635CA3QDRRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM63635CA3QDRRRQ1.pdf
- Description:
- IC REG BUCK 3.3V 3.25A 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,984
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Product details
Overview
LM63635CA3QDRRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 3.25A output current, fixed 3.3V output voltage, and fixed 400kHz switching frequency across 3.5V–36V input range. It integrates precision enable, open-drain RESET flag, and thermal/overcurrent protection in a WSON-12 package for body electronics power rails.
For engineers reviewing the LM63635CA3QDRRRQ1 datasheet, LM63635CA3QDRRRQ1 pinout, LM63635CA3QDRRRQ1 application, or LM63635CA3QDRRRQ1 equivalent, key selection criteria include its 400kHz fixed-frequency operation (vs. 2.1MHz variants), 3.3V fixed output, 23µA quiescent current, 50ns minimum on-time, and CISPR 25-compliant EMI performance in automotive environments.
Technical Context
The LM63635CA3QDRRRQ1 implements peak-current-mode control with automatic PFM/PWM mode transition, enabling high light-load efficiency while maintaining tight regulation. Its internal compensation, integrated 3.3V feedback divider, and 100kΩ internal pulldown on SYNC/MODE simplify design and reduce external component count.
It supports forced PWM (FPWM) via SYNC/MODE tied to VCC, AUTO mode when grounded, or external synchronization - all configurable without rework. Protection includes cycle-by-cycle current limit, hiccup short-circuit response, thermal shutdown at 163°C, and input UVLO with 3.5V rising threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide automotive battery transients including cold-crank (down to 3.5V) and load-dump (up to 36V). |
| Output Voltage | Fixed 3.3V ±1.5% - eliminates external resistor divider, reduces noise sensitivity, and ensures compatibility with MCU I/O and CAN transceivers. |
| Switching Frequency | Fixed 400kHz - enables use of smaller magnetics than 100–200kHz parts while avoiding AM/FM band interference common with 2.1MHz variants. |
| Max Output Current | 3.25A continuous - sufficient for powering infotainment SoCs, ADAS camera modules, or multi-rail body controllers. |
| Quiescent Current | 23µA - maintains low standby power in always-on domains such as gateway ECUs or telematics units. |
| Min On-Time | 50ns - enables high step-down ratios (e.g., 24V→3.3V at 400kHz) without pulse-skipping or instability. |
| Thermal Shutdown | 163°C trip / 150°C recovery - provides robust overtemperature protection with hysteresis to prevent oscillation during thermal stress. |
Pinout & Package
LM63635CA3QDRRRQ1 uses the DRR (WSON-12) package: 3.00mm × 3.00mm, 0.5mm pitch, with exposed PowerPAD™ thermal pad soldered to PCB ground plane for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 3.5V–36V; requires local 10µF+ ceramic bypass capacitor directly to PGND for stability and EMI suppression. |
| EN | Enable control | Precision threshold (1.425–1.575V high, 0.9–0.94V low); supports adjustable UVLO via external divider or direct VIN connection. |
| PGND / DAP | Power ground & thermal sink | Must be connected to system ground plane with wide copper; DAP is electrically tied to PGND and serves as primary thermal path. |
| MODE/SYNC | Operating mode selection | Tie to AGND for AUTO (PFM/PWM auto-switching), VCC for FPWM, or external clock for sync; internal 100kΩ pulldown prevents floating. |
| AGND | Analog reference ground | Separate from PGND but must be connected at single point; reference for FB, RESET, EN, and internal error amplifier. |
| VCC | Internal LDO output | 5V ±2.5% regulated supply for internal circuitry; requires 1µF ceramic cap to PGND; not for external loading. |
| RESET | Open-drain power-good flag | Pulls low during startup, fault, or EN=low; requires external pullup (10–100kΩ) to logic rail; 110–115% FB threshold ensures accurate sequencing. |
| FB | Feedback input | Internally connected to 3.3V divider; must not float or ground; monitors output for regulation and RESET assertion. |
| SW | Switch node | Connects to power inductor; high dv/dt node requiring tight layout and minimal trace area to reduce EMI. |
| CBOOT | Bootstrap supply | Requires 220nF X7R ceramic capacitor between CBOOT and SW; critical for high-side MOSFET gate drive integrity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive reliability and lifetime requirements for under-hood and cabin applications. |
| Integrated 3.3V feedback network | Eliminates external resistors, reduces board space by ~2mm², improves noise immunity, and avoids drift-related output inaccuracies. |
| 400kHz fixed-frequency operation | Enables optimized inductor selection (e.g., 2.2µH) with predictable EMI profile and avoids FM-band harmonics that complicate filtering in 2.1MHz variants. |
| 23µA quiescent current | Supports >10-year battery life in always-on vehicle modules (e.g., remote keyless entry receivers, tire pressure sensors) without compromising start-up speed. |
| RESET flag with deglitching | 10–30µs glitch filter prevents false resets during transient load steps; 2–5ms delay ensures stable output before asserting "power good" to downstream logic. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers display controller, audio DSP, and USB hub in head-unit systems requiring clean, stable 3.3V rail. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic voltage; delivers 3.25A peak during video decode bursts with <1.5% output deviation. Use Value: Fixed 3.3V output and internal compensation eliminate tuning effort; 400kHz switching allows compact 14mm × 14mm layout compatible with tight infotainment board constraints. | Use Scenario: Supplies image sensor, ISP, and serializer in front/rear-view cameras operating in engine bay or bumper locations. IC Role / Device Role / Timing Role: Main power stage converting 12V battery to regulated 3.3V for CMOS sensor interface and MIPI lanes. Use Value: 3.5V–36V input range handles cold-crank dips and load-dump surges; 50ns min on-time ensures stable 3.3V output even at 24V input. |
| Body Control Module (BCM) Core Rail | Automotive Gateway ECU Standby Supply |
Use Scenario: Generates 3.3V for microcontroller, CAN transceivers, and LIN drivers in door modules, seat controllers, or lighting nodes. IC Role / Device Role / Timing Role: Central power source for mixed-signal subsystem; supports wake-on-LIN/CAN with ultra-low IQ and precision enable thresholds. Use Value: 23µA quiescent current extends vehicle sleep mode battery life; AEC-Q100 Grade 1 rating ensures operation across full automotive temperature range. | Use Scenario: Provides always-on 3.3V supply to gateway MCU's RTC, memory retention, and wake-up logic during vehicle off-state. IC Role / Device Role / Timing Role: Low-IQ buck converter enabling <100µA total system standby current; RESET flag sequences MCU boot after ignition-on. Use Value: Precision enable (±75mV hysteresis) enables reliable wake-up from deep sleep; internal VCC LDO powers control logic independently of output load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM63635CC3QDRRRQ1 | Same WSON-12 package, identical 3.3V output, but fixed 2.1MHz switching frequency and spread-spectrum EMI reduction. | Better suited for space-constrained designs needing smallest possible inductors; higher frequency increases light-load PFM losses vs. 400kHz. | Select when board area is critical and EMI filtering must target FM band; avoid if thermal management is challenging at 2.1MHz. |
| LM63625A3QDRRRQ1 | Lower 2.5A rating, same 400kHz/3.3V configuration, but lacks spread spectrum and has higher 35µA IQ. | Cost-optimized alternative for less demanding loads; reduced current capability limits use in high-power infotainment or ADAS. | Choose only when 3.25A margin is unnecessary and BOM cost is prioritized over EMI performance and lowest IQ. |
Compared with LM63635CC3QDRRRQ1 and LM63625A3QDRRRQ1, the LM63635CA3QDRRRQ1 uniquely balances 400kHz efficiency, 3.25A capability, and 23µA IQ - making it optimal for thermally constrained, always-on automotive modules where EMI must avoid FM band but board area is less restrictive than in camera modules.
Availability
LM63635CA3QDRRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera power, and body electronics applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM63635CA3QDRRRQ1 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 ICs with decades of automotive qualification expertise.
The LM63635C-Q1 product line delivers highly integrated, AEC-Q100-qualified buck converters targeting next-generation automotive power rails - designed specifically for infotainment, ADAS, and body electronics where reliability, EMI, and thermal performance are critical.
FAQ
What is the input voltage range supported by the LM63635CA3QDRRRQ1?
The LM63635CA3QDRRRQ1 supports an input voltage range of 3.5V to 36V. This range accommodates automotive battery conditions including cold-crank events (down to 3.5V) and load-dump transients (up to 36V), ensuring reliable operation across all vehicle operating states. The device incorporates input undervoltage lockout with a 3.5V rising threshold to prevent erratic behavior during brownout conditions.
Does the LM63635CA3QDRRRQ1 require external compensation components?
No, the LM63635CA3QDRRRQ1 features internal compensation, eliminating the need for external RC networks typically required in voltage-mode or externally compensated current-mode buck regulators. This integration reduces bill-of-materials count, saves PCB area, and removes loop-stability tuning effort - enabling faster design cycles and consistent performance across production units.
How does the RESET pin on the LM63635CA3QDRRRQ1 function during startup and fault conditions?
The RESET pin on the LM63635CA3QDRRRQ1 is an open-drain output that pulls low during startup (for ~2–5ms after EN goes high), during output overvoltage/undervoltage faults, thermal shutdown, or when EN is deasserted. It transitions high only after the FB voltage stabilizes within 110–115% of 3.3V and remains valid for sequencing downstream logic. An external pullup resistor (10–100kΩ) is required for proper operation.
Can the LM63635CA3QDRRRQ1 operate in forced PWM mode, and how is it configured?
Yes, the LM63635CA3QDRRRQ1 supports forced PWM (FPWM) mode. To enable FPWM, tie the SYNC/MODE pin to VCC. In this mode, the regulator operates continuously at its fixed 400kHz switching frequency regardless of load - eliminating audible noise and ensuring predictable EMI behavior, which is essential for sensitive RF or audio subsystems in automotive applications.
What thermal performance can be expected from the LM63635CA3QDRRRQ1 in a typical 4-layer PCB layout?
In a standard JEDEC 4-layer board layout with the DAP thermally connected to a 1-in² copper pour, the LM63635CA3QDRRRQ1 exhibits a junction-to-ambient thermal resistance (RθJA) of 47.4°C/W. At 3.25A output and 12V input, typical power dissipation is ~0.5W, resulting in ~24°C junction-to-ambient rise - well within the –40°C to +150°C junction temperature limit and supporting reliable operation without forced airflow.
LM63635CA3QDRRRQ1 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:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-WSON (3x3)
LM63635CA3QDRRRQ1 FAQ
1.How can I place an order for LM63635CA3QDRRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM63635CA3QDRRRQ1 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 LM63635CA3QDRRRQ1 reliable?
The price and inventory of LM63635CA3QDRRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM63635CA3QDRRRQ1 is usually 5 days.
3.What payment methods are accepted for LM63635CA3QDRRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM63635CA3QDRRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM63635CA3QDRRRQ1?
LM63635CA3QDRRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM63635CA3QDRRRQ1 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 LM63635CA3QDRRRQ1?
For technical support, including LM63635CA3QDRRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM63635CA3QDRRRQ1 requirements.
6.How does Aetrix verify that LM63635CA3QDRRRQ1 is sourced from the original manufacturer or authorized distributors?
All LM63635CA3QDRRRQ1 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 LM63635CA3QDRRRQ1 meets industry standards.
7.What is the process for return or replacement of LM63635CA3QDRRRQ1?
All LM63635CA3QDRRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM63635CA3QDRRRQ1, 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 LM63635CA3QDRRRQ1 part is unused and in its original packaging.
Return procedure for LM63635CA3QDRRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM63635CA3QDRRRQ1 Tags
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