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Texas Instruments LM63635CA5QDRRRQ1
- Part No.:
- LM63635CA5QDRRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM63635CA5QDRRRQ1.pdf
- Description:
- IC REG BUCK 5V 3.25A 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,885
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Product details
Overview
LM63635CA5QDRRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 3.25A output current, fixed 5V 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 for body electronics power rails.
For engineers reviewing the LM63635CA5QDRRRQ1 datasheet, LM63635CA5QDRRRQ1 pinout, LM63635CA5QDRRRQ1 application, or LM63635CA5QDRRRQ1 equivalent, key selection criteria include its 400kHz fixed-frequency operation, 5V fixed-output configuration, WSON-12 package with PowerPAD™, 23µA quiescent current, and automotive-grade thermal performance (–40°C to +150°C junction).
Technical Context
The LM63635CA5QDRRRQ1 uses peak-current-mode control with automatic PFM/PWM mode transition and internal compensation. Its 400kHz fixed switching frequency enables compact magnetics while maintaining EMI compliance with CISPR 25 via pseudo-random spread spectrum.
It features a precision enable input with 1.425V–1.575V turn-on threshold, open-drain RESET output with 110%–115% rising threshold relative to FB, and integrated 5V LDO (VCC) for internal biasing - all operating within –40°C to +125°C ambient and –40°C to +150°C junction temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports full automotive battery range including cold-crank (6V) and load-dump (36V) transients. |
| Output Voltage | Fixed 5V ±1.5% - eliminates external feedback resistors; optimized for MCU, sensor, and interface rail requirements. |
| Max Output Current | 3.25A continuous - sufficient for infotainment SoCs, ADAS camera modules, and lighting drivers. |
| Switching Frequency | Fixed 400kHz - balances efficiency, size, and EMI; avoids AM/FM bands while enabling small inductors. |
| Quiescent Current | 23µA - enables always-on systems (e.g., CAN wake-up circuits) without excessive battery drain. |
| Min On-Time | 50ns - supports high VIN-to-VOUT ratios (e.g., 24V→5V) without pulse-skipping instability. |
| Junction Temp Range | –40°C to +150°C - meets AEC-Q100 Grade 1 requirements for under-hood and cabin applications. |
Pinout & Package
LM63635CA5QDRRRQ1 is housed in a thermally enhanced WSON-12 (DRR) package measuring 3.00mm × 3.00mm with exposed PowerPAD™ for efficient PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Main input supply connection; requires local 10µF+ ceramic bypass capacitor to PGND. |
| EN | Enable Control | Precision analog input (1.425V–1.575V threshold); supports external UVLO divider or direct VIN tie. |
| PGND / DAP | Power Ground | Primary return path for high-current switching loop; must be soldered to large ground plane for thermal and EMI performance. |
| MODE/SYNC | Operating Mode Select | Tied to AGND for AUTO (PFM/PWM), VCC for FPWM, or external clock for synchronization. |
| AGND | Analog Ground | Reference for FB, RESET, EN; isolated from PGND at package level but connected on PCB. |
| VCC | Internal LDO Output | 5V regulated supply for internal circuitry; requires 1µF ceramic capacitor to PGND; not for external loads. |
| RESET | Open-Drain Power-Good Flag | Asserts low during startup, overcurrent, or thermal shutdown; requires external pullup (10kΩ–100kΩ). |
| FB | Feedback Input | Internally connected to 5V divider; not externally accessible - confirms fixed-output configuration. |
| SW | Switch Node | High-side MOSFET drain; connects to power inductor; critical for EMI layout and snubber design. |
| CBOOT | Bootstrap Supply | Supplies gate drive for high-side FET; requires 220nF X7R capacitor between CBOOT and SW. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 Qualification | Validated for –40°C to +125°C ambient operation - suitable for engine bay, headlight, and ADAS ECU deployments. |
| Integrated 5V Fixed Output | Eliminates external resistor network and associated layout sensitivity - reduces BOM count and improves long-term output accuracy. |
| 400kHz Fixed Switching Frequency | Enables use of standard, low-DCR 2.2µH inductors and minimizes filter component size while avoiding AM radio band interference. |
| 23µA Quiescent Current | Extends battery life in always-on vehicle subsystems (e.g., telematics, door module standby) without compromising start-up speed. |
| Open-Drain RESET with Hysteresis | Provides reliable system-level power sequencing and fault indication with 2.5% hysteresis - simplifies microcontroller reset logic design. |
Applications
| Automotive Infotainment Power | Body Control Module Rail |
|---|---|
Use Scenario: Powering display controllers, audio DSPs, and USB-C PD controllers in center-stack head units. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying core logic and interface rails with tight transient response. Use Value: 3.25A capability supports burst-mode processing; 400kHz switching enables compact 14mm × 14mm layout per TI reference design. | Use Scenario: Supplying door modules, seat controllers, and mirror actuators requiring stable 5V for MCU and CAN transceivers. IC Role / Device Role / Timing Role: Always-on 5V source with ultra-low IQ and precision enable for wake-on-CAN functionality. Use Value: 23µA quiescent current prevents parasitic battery drain; AEC-Q100 qualification ensures reliability across temperature cycling. |
| ADAS Camera Power | Automotive Lighting Driver Bias |
Use Scenario: Providing clean 5V power to image sensors and ISP processors in front/rear-view cameras. IC Role / Device Role / Timing Role: High-efficiency intermediate rail converting 12V battery to 5V for sensor signal chain. Use Value: Low EMI via spread spectrum and robust 50ns min-on-time ensure noise-free image capture during dynamic lighting conditions. | Use Scenario: Biasing LED driver ICs and current-sense amplifiers in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Stable 5V auxiliary supply for analog front-end and PWM dimming logic. Use Value: Thermal shutdown (163°C) and hiccup-mode short-circuit protection prevent field failures during LED thermal runaway events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM63635CC5QDRRRQ1 | Same WSON-12 package, identical 5V output, but fixed 2.1MHz switching frequency instead of 400kHz. | Better suited for space-constrained designs needing smaller inductors; higher frequency increases light-load PFM losses. | Select when board area is critical and EMI filtering can accommodate 2.1MHz harmonics. |
| LM63625A5QDRRRQ1 | Lower 2.5A rating, same 5V/400kHz, but lacks spread spectrum and has higher 35µA IQ. | Targeted at cost-sensitive body electronics where EMI margin is less stringent and 3.25A headroom is unnecessary. | Choose for non-ADAS applications where full 3.25A capability and CISPR 25 compliance are not required. |
Compared with LM63635CA5QDRRRQ1, LM63635CC5QDRRRQ1 trades lower EMI and better light-load efficiency for higher-frequency magnetics, while LM63625A5QDRRRQ1 reduces cost and feature set at the expense of output current and advanced EMI mitigation - making LM63635CA5QDRRRQ1 optimal for mid-tier automotive systems demanding balance of performance, size, and compliance.
Availability
LM63635CA5QDRRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, body electronics, and ADAS applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM63635CA5QDRRRQ1 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.
The LM63635C-Q1 product line delivers highly integrated, AEC-Q100-qualified buck converters for automotive subsystems where reliability, thermal robustness, and EMI control are mandatory - targeting infotainment, ADAS, and body electronics power rails.
FAQ
What is the output voltage configuration of the LM63635CA5QDRRRQ1?
The LM63635CA5QDRRRQ1 features a factory-trimmed, fixed 5V output voltage with ±1.5% regulation accuracy across temperature and load. Its internal feedback divider eliminates external resistors, reducing component count and improving long-term stability. This configuration is confirmed by TI's device nomenclature ('A5' suffix denotes 5V/400kHz variant) and electrical characteristics table specifying VFB_5V = 4.925V–5.075V.
Does the LM63635CA5QDRRRQ1 support spread spectrum modulation?
No, the LM63635CA5QDRRRQ1 does not include spread spectrum modulation. That feature is only present in the 'C'-suffix variants (e.g., LM63635CC5QDRRRQ1), as documented in TI's device comparison table and feature descriptions. The LM63635CA5QDRRRQ1 uses fixed 400kHz operation without dithering - verified by absence of fPSS and fSPREAD parameters in its Electrical Characteristics section.
What is the thermal performance of the LM63635CA5QDRRRQ1 in its WSON-12 package?
The LM63635CA5QDRRRQ1 in DRR (WSON-12) package has RθJC(bot) = 6.3°C/W and RθJB = 20.7°C/W, enabling effective heat transfer to the PCB ground plane via its exposed PowerPAD™. Its thermal shutdown activates at 155°C–175°C (typical 163°C), with recovery at ~150°C. These values are measured per JESD 51-7 on a 4-layer JEDEC board and confirmed in Section 6.4 of the official datasheet.
Can the LM63635CA5QDRRRQ1 operate with a pre-biased output?
No - TI explicitly advises against starting up the LM63635CA5QDRRRQ1 with a pre-biased output voltage greater than 1V, as stated in Section 7.3.4. The device uses reference-based soft-start and lacks output discharge FET control during enable assertion; applying voltage to VOUT before EN activation risks latch-up or uncontrolled inrush current through internal paths.
What protection features are integrated into the LM63635CA5QDRRRQ1?
The LM63635CA5QDRRRQ1 integrates thermal shutdown (163°C trip), cycle-by-cycle current limit (3.9A–5.4A), hiccup-mode short-circuit protection, input undervoltage lockout (3.5V rising threshold), and output overvoltage protection via RESET flag assertion. All protections are hardware-based and do not require external components - validated in Sections 6.5, 6.6, and 7.3.6 of the datasheet.
LM63635CA5QDRRRQ1 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):
- 5V
- 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)
LM63635CA5QDRRRQ1 FAQ
1.How can I place an order for LM63635CA5QDRRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM63635CA5QDRRRQ1 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 LM63635CA5QDRRRQ1 reliable?
The price and inventory of LM63635CA5QDRRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM63635CA5QDRRRQ1 is usually 5 days.
3.What payment methods are accepted for LM63635CA5QDRRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM63635CA5QDRRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM63635CA5QDRRRQ1?
LM63635CA5QDRRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM63635CA5QDRRRQ1 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 LM63635CA5QDRRRQ1?
For technical support, including LM63635CA5QDRRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM63635CA5QDRRRQ1 requirements.
6.How does Aetrix verify that LM63635CA5QDRRRQ1 is sourced from the original manufacturer or authorized distributors?
All LM63635CA5QDRRRQ1 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 LM63635CA5QDRRRQ1 meets industry standards.
7.What is the process for return or replacement of LM63635CA5QDRRRQ1?
All LM63635CA5QDRRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM63635CA5QDRRRQ1, 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 LM63635CA5QDRRRQ1 part is unused and in its original packaging.
Return procedure for LM63635CA5QDRRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM63635CA5QDRRRQ1 Tags
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