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Texas Instruments LM63635DQDRRRQ1
- Part No.:
- LM63635DQDRRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM63635DQDRRRQ1.pdf
- Description:
- IC REG BUCK ADJ 3.25A 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,899
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Product details
Overview
LM63635DQDRRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C ambient) synchronous step-down DC/DC converter for automotive applications, delivering up to 3.25A output current from a 3.5V–36V input, featuring 50ns minimum on-time, 23µA quiescent current, and WSON-12 (3mm × 3mm) thermally enhanced package with PowerPAD™.
For engineers reviewing the LM63635DQDRRRQ1 datasheet, LM63635DQDRRRQ1 pinout, LM63635DQDRRRQ1 application, or LM63635DQDRRRQ1 equivalent, key selection considerations include its automotive-grade thermal performance (RθJA = 47.4°C/W), pin-selectable 3.3V/5V/fixed-adjustable VOUT, 250kHz–2200kHz programmable switching frequency, FPWM/AUTO/sync mode control, and integrated RESET flag with 112% rising threshold.
Technical Context
The LM63635DQDRRRQ1 implements peak-current-mode control with automatic PFM-to-PWM transition at light load, enabling high efficiency across 0–3.25A. Its internal 5V LDO (VCC) powers control circuitry and supports logic-level interface functions, while the 1V feedback reference enables precise regulation of 1V–20V outputs via external resistor dividers in adjustable mode.
It integrates high-side (93mΩ) and low-side (61mΩ) MOSFETs, features hiccup-mode short-circuit protection triggered after 128 overcurrent cycles, and includes pseudo-random spread spectrum (±5% modulation depth, 0.98Hz pattern rate) to meet CISPR 25 Class 5 EMI requirements without added filtering components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - Supports full automotive battery range including cold-crank (≥3.5V) and load-dump transients (≤36V). |
| Output Current | 3.25A continuous - Sustains full rated load in WSON package at +125°C ambient with proper PCB thermal design. |
| Quiescent Current | 23µA - Enables always-on systems (e.g., body control modules) to meet <100µA system sleep budget. |
| Switching Frequency | 250kHz to 2200kHz - Adjustable via RT resistor; enables optimization between EMI (lower fSW) and size (higher fSW). |
| Min On-Time | 50ns - Allows high step-down ratios (e.g., 24V→3.3V at 2.1MHz) without pulse-skipping instability. |
| Feedback Reference | 1.000V ±1.5% - Enables accurate 1V–20V output regulation using standard 1% resistors in ADJ mode. |
| Thermal Resistance | RθJA = 47.4°C/W - Measured on 4-layer JEDEC board; requires ≥200mm² exposed DAP copper for full 3.25A rating at +125°C ambient. |
| EMI Compliance | CISPR 25 Class 5 - Achieved with integrated spread spectrum and optimized pinout; no external EMI filters required in typical layouts. |
Pinout & Package
LM63635DQDRRRQ1 uses the DRR (WSON-12) package: 3mm × 3mm, 0.5mm pitch, thermally enhanced with exposed PowerPAD™ (DAP) on bottom for direct PCB thermal sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Main input supply connection (3.5V–36V); requires local 220nF ceramic capacitor within 1mm of pin and PGND. |
| SW | Switch Node | Connection to external power inductor; carries high di/dt; must be routed with minimal loop area. |
| PGND/DAP | Power Ground & Thermal Pad | Primary return path for high-current switching; DAP must be soldered to ≥200mm² internal/external ground plane for thermal performance. |
| CBOOT | Bootstrap Supply | Connects 220nF capacitor to SW; supplies gate drive voltage for high-side MOSFET. |
| VCC | Internal LDO Output | 5V regulated supply for internal logic; not for external loads; requires 1µF bypass to PGND. |
| FB | Feedback Input | Senses output voltage; regulates to 1.000V in ADJ mode; connects to resistor divider tap point. |
| EN | Enable Control | Logic-level enable with precision thresholds (1.425V–1.575V high); supports direct VIN connection or external divider. |
| RESET | Open-Drain Power-Good | Asserts low when VOUT drops below 93% of target; requires external pullup; used for system sequencing. |
| VSEL | Voltage Select | Configures output: GND=3.3V, VCC=5V, 10kΩ-to-GND=adjustable; latched at power-up. |
| RT | Frequency Set | Resistor-programmable oscillator: GND=2.1MHz, VCC=400kHz, resistor=250–2200kHz; not floatable. |
| SYNC/MODE | Mode Control | Selects FPWM (VCC), AUTO (GND), or external sync clock; internal 100kΩ pulldown if floating. |
| AGND | Analog Ground | Reference for FB, EN, VSEL, RT, SYNC; must connect to system ground near IC, separate from PGND at single point. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with full electrical specs guaranteed - eliminates need for derating in under-hood applications. |
| Integrated high- and low-side MOSFETs | 93mΩ HS / 61mΩ LS RDS(on) - Reduces external component count and layout complexity; enables compact 14mm × 14mm 3.25A designs at 2.2MHz. |
| Pseudo-random spread spectrum | ±5% frequency dither at 0.98Hz - Lowers peak EMI by >10dB across FM band (76–108MHz), easing CISPR 25 compliance without added ferrites or shields. |
| Pin-selectable output voltage | 3.3V / 5V / adjustable (1V–20V) - Eliminates external feedback resistors for common rails; reduces BOM cost and layout area. |
| Reset flag with tight thresholds | 112% rising / 93% falling hysteresis on FB - Provides reliable power-good signaling for microcontroller reset sequencing in infotainment and ADAS systems. |
| Short minimum on-time (50ns) | Enables high input-to-output voltage ratios (e.g., 24V→3.3V) at 2.1MHz without duty-cycle limitation - avoids need for pre-regulation stages. |
Applications
| Automotive Infotainment | Automotive Body Electronics |
|---|---|
Use Scenario: Powering SoC, display controller, and audio codec in head-unit with 12V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator supplying core logic rails; provides RESET signal for synchronized boot. Use Value: 23µA quiescent current extends battery life in accessory-off state; spread spectrum meets CISPR 25 Class 5 without shielded inductors. | Use Scenario: Supplying door module MCU, LED drivers, and LIN transceivers in 24V commercial vehicle architecture. IC Role / Device Role / Timing Role: Main 5V rail generator with precision enable for wake-on-LIN functionality. Use Value: 36V max input withstands load-dump transients; 50ns min on-time supports 24V→5V conversion at 2.1MHz for small form factor. |
| Automotive ADAS Camera | Automotive Cluster Display |
Use Scenario: Powering image sensor and ISP in forward-facing camera with thermal constraints inside mirror housing. IC Role / Device Role / Timing Role: Compact 3.3V supply with thermal shutdown (155°C) and RESET monitoring for fail-safe operation. Use Value: WSON-12 package with PowerPAD™ achieves 3.25A at +125°C ambient; hiccup protection prevents thermal runaway during short-circuit events. | Use Scenario: Generating 5V rail for TFT LCD backlight driver and touch controller in digital instrument cluster. IC Role / Device Role / Timing Role: High-efficiency buck converter with auto-mode PFM/PWM transition to maintain >85% efficiency from 1mA to 3.25A. Use Value: Light-load efficiency preserves battery during ignition-off; adjustable frequency avoids AM/FM band interference in sensitive analog front-end circuits. |
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 | Lower 2.5A output current; identical pinout, package, and feature set except reduced current rating and slightly higher RDS(on). | Suitable for lower-power ADAS sensors or body ECUs where 3.25A headroom is unnecessary. | Select when system load is ≤2.5A and cost reduction is prioritized over margin. |
| LM63610DQDRRRQ1 | Same 3.25A rating but fixed 2.1MHz frequency (no RT pin); lacks VSEL pin - only adjustable VOUT via FB divider. | Better for space-constrained designs requiring fixed high-frequency operation and simplified configuration. | Choose when frequency stability is critical and output voltage is always adjustable, not fixed 3.3V/5V. |
Compared with LM63625DQDRRRQ1 and LM63610DQDRRRQ1, LM63635DQDRRRQ1 uniquely combines 3.25A capability, pin-selectable fixed outputs, and full frequency adjustability - making it optimal for flexible, high-reliability automotive power rails where design reuse across multiple voltage/frequency points is required.
Availability
LM63635DQDRRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body electronics applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM63635DQDRRRQ1 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 LM63635-Q1 product line delivers robust, AEC-Q100-qualified buck converters for demanding automotive subsystems - designed specifically to replace discrete DC/DC solutions in infotainment, cluster, and ADAS domains with integrated thermal, EMI, and functional safety features.
FAQ
What is the maximum input voltage rating for LM63635DQDRRRQ1?
The LM63635DQDRRRQ1 has an absolute maximum input voltage rating of 42V for the WSON package, with recommended operating input voltage limited to 3.25A continuous operation at 36V. This allows safe handling of automotive load-dump transients per ISO 7637-2 Pulse 5a while maintaining full output current capability up to 36V.
Does LM63635DQDRRRQ1 support adjustable output voltage, and how is it configured?
Yes, LM63635DQDRRRQ1 supports adjustable output voltage from 1V to 20V. It is configured by connecting a 10kΩ resistor from the VSEL pin to AGND, which disables the internal voltage divider and enables regulation to 1.000V at the FB pin. An external resistor divider then sets the final output voltage, with accuracy maintained by the ±1.5% feedback reference.
What thermal performance can be expected from LM63635DQDRRRQ1 in the WSON-12 package?
LM63635DQDRRRQ1 in the WSON-12 (DRR) package has a junction-to-ambient thermal resistance (RθJA) of 47.4°C/W on a 4-layer JEDEC board. With proper PCB layout - including ≥200mm² exposed DAP copper connected to internal ground planes - it sustains 3.25A output current at +125°C ambient temperature, verified per AEC-Q100 thermal testing requirements.
How does the spread spectrum feature in LM63635DQDRRRQ1 improve EMI performance?
The LM63635DQDRRRQ1 uses pseudo-random spread spectrum with ±5% frequency modulation at 0.98Hz to distribute switching energy across a wider bandwidth. This reduces peak radiated emissions by >10dB in the FM band (76–108MHz), enabling CISPR 25 Class 5 compliance without additional EMI filters or shielding - critical for compact automotive infotainment layouts.
Is LM63635DQDRRRQ1 pin-compatible with other devices in the LM636xx-Q1 family?
LM63635DQDRRRQ1 is pin-compatible with LM63610-Q1, LM63615-Q1, and LM63625-Q1 in the same WSON-12 package. Shared pinout enables hardware reuse across different current ratings and feature sets, though functional differences exist - e.g., LM63625DQDRRRQ1 supports only 2.5A, and LM63610DQDRRRQ1 lacks VSEL and RT pins.
LM63635DQDRRRQ1 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):
- 32V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 3.25A
- Frequency - Switching:
- 250kHz ~ 2.2MHz
- 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)
LM63635DQDRRRQ1 FAQ
1.How can I place an order for LM63635DQDRRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM63635DQDRRRQ1 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 LM63635DQDRRRQ1 reliable?
The price and inventory of LM63635DQDRRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM63635DQDRRRQ1 is usually 5 days.
3.What payment methods are accepted for LM63635DQDRRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM63635DQDRRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM63635DQDRRRQ1?
LM63635DQDRRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM63635DQDRRRQ1 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 LM63635DQDRRRQ1?
For technical support, including LM63635DQDRRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM63635DQDRRRQ1 requirements.
6.How does Aetrix verify that LM63635DQDRRRQ1 is sourced from the original manufacturer or authorized distributors?
All LM63635DQDRRRQ1 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 LM63635DQDRRRQ1 meets industry standards.
7.What is the process for return or replacement of LM63635DQDRRRQ1?
All LM63635DQDRRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM63635DQDRRRQ1, 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 LM63635DQDRRRQ1 part is unused and in its original packaging.
Return procedure for LM63635DQDRRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM63635DQDRRRQ1 Tags
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