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Texas Instruments LM63635DQPWPRQ1
- Part No.:
- LM63635DQPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM63635DQPWPRQ1.pdf
- Description:
- IC REG BUCK ADJ 3.25A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,413
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Product details
Overview
LM63635DQPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 3.25A output current, operating from 3.5V to 32V input (HTSSOP package), with pin-selectable 3.3V/5V/fixed or adjustable 1V–20V output, and 400kHz/2.1MHz switching frequency. It serves as primary power supply for infotainment head units requiring high EMI immunity and low quiescent current (23µA) in harsh vehicle environments.
For engineers reviewing the LM63635DQPWPRQ1 datasheet, LM63635DQPWPRQ1 pinout, LM63635DQPWPRQ1 application, or LM63635DQPWPRQ1 equivalent, key selection criteria include its HTSSOP-16 PowerPAD™ thermal performance (RθJA = 43.1°C/W), 50ns minimum on-time for high VIN/VOUT ratios, pseudo-random spread spectrum for CISPR 25 compliance, precision enable thresholds (VEN-H = 1.5V ±75mV), and RESET flag timing (tRISE-DELAY = 3ms typical).
Technical Context
The LM63635DQPWPRQ1 implements peak-current-mode control with automatic PFM/PWM mode transition, enabling high light-load efficiency while maintaining tight regulation via internal compensation. Its integrated high-side (93mΩ) and low-side (61mΩ) MOSFETs support continuous 3.25A output with thermal shutdown at 163°C and hiccup short-circuit protection triggered after 128 overcurrent cycles.
It features pin-configurable operation: VSEL sets output voltage (3.3V/5V/adjustable), RT selects switching frequency (400kHz/2.1MHz/250–2200kHz), and SYNC/MODE enables FPWM, AUTO, or external synchronization. The device integrates a 5V internal LDO (VCC), 1V feedback reference, and open-drain RESET flag with 112% rising threshold and 93% falling threshold relative to FB voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 32V - supports full automotive battery range including cold-crank (6V) and load-dump (32V) transients in HTSSOP package. |
| Output Current | 3.25A continuous - sufficient for powering SoCs, display controllers, or radar MMICs without external current boosting. |
| Quiescent Current | 23µA - enables always-on systems (e.g., body control modules) to meet <100µA system sleep budgets. |
| Switching Frequency | 400kHz or 2.1MHz (pin-selectable) - allows layout optimization: low frequency for EMI-sensitive analog sections, high frequency for compact 14mm × 14mm designs. |
| Min On-Time | 50ns - enables 12V-to-1V conversion at 2.1MHz without pulse-skipping, critical for ADAS domain controllers. |
| EMI Performance | CISPR 25 Class 5 compliant with pseudo-random spread spectrum - reduces peak radiated emissions by spreading energy across ±5% bandwidth, easing FM-band filtering. |
| Thermal Resistance | RθJA = 43.1°C/W (HTSSOP) - enables 3.25A operation at +85°C ambient with standard 2oz copper and thermal vias to DAP. |
Pinout & Package
LM63635DQPWPRQ1 uses the HTSSOP-16 (PWP) thermally enhanced package measuring 6.4mm × 5.0mm with exposed PowerPAD™ (DAP) for direct PCB thermal sinking. Pin count is 16, with 2 NC pins (pins 14 and 16), 1 DAP (pin 17), and dual ground paths (AGND and PGND) for noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch node | Connects directly to power inductor; high dv/dt node requiring minimized loop area to reduce EMI. |
| 3 CBOOT | Bootstrap supply | Drives high-side FET gate; requires 220nF ceramic capacitor placed within 1mm of SW pin. |
| 4 VCC | Internal 5V LDO output | Powers internal logic; must be decoupled with 1µF capacitor to PGND; not for external loads. |
| 5 RT | Frequency programming | Tie to VCC for 400kHz, AGND for 2.1MHz, or resistor for 250–2200kHz; floating disables switching. |
| 6 VSEL | Output voltage select | Tie to VCC for 5V, AGND for 3.3V, or 10kΩ to AGND for adjustable output; latched at power-up. |
| 7 SYNC/MODE | Mode control | Tie to VCC for FPWM, AGND for AUTO (PFM/PWM auto-switch), or external clock for sync; internal 100kΩ pulldown. |
| 8 RESET | Open-drain power-good flag | Asserts low when EN = low or FB < 93% of target; requires external pullup for system sequencing. |
| 9 FB | Feedback input | Regulates to 1V (ADJ), 3.3V, or 5V depending on VSEL; leakage <100nA ensures accuracy with high-value dividers. |
| 10 AGND | Analog ground | Reference for FB, VSEL, RT, SYNC/MODE; must connect to system ground with low-impedance path. |
| 11 EN | Enable input | Logic-level enable with precision thresholds (VEN-H = 1.5V ±75mV); connects directly to VIN for simple startup. |
| 12, 13 VIN | Main input supply | Accepts 3.5–32V; requires 220nF bypass cap placed within 1mm of VIN and PGND pins. |
| 15, 16 PGND | Power ground | High-current return path for HS/LS FETs and input/output capacitors; connect to AGND at single point. |
| 17 DAP | Thermal pad / ground | Exposed die attach pad; must be soldered to large PCB copper area for thermal dissipation and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive cabin and engine bay temperature requirements without derating. |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage reports - accelerates ISO 26262 ASIL-B system certification. |
| Pin-compatible with LM63610/15/25-Q1 | Enables scalable power design across 1A–3.25A loads using same PCB footprint and layout - reduces NRE and validation effort. |
| Automatic frequency foldback | Reduces switching frequency at light load to maintain >85% efficiency down to 1mA - extends battery life in always-on modules. |
| Integrated protection suite | Includes cycle-by-cycle current limit, thermal shutdown (163°C), hiccup short-circuit recovery, and UVLO (3.5V rising) - eliminates need for external fault management circuitry. |
Applications
| Automotive Infotainment Head Unit | ADAS Radar Processing Module |
|---|---|
Use Scenario: Powers application processor, DDR memory, and display interface in centralized infotainment system with CAN/FlexRay connectivity. IC Role / Device Role / Timing Role: Primary 5V/3.25A buck regulator supplying core logic rails; RESET flag sequences SoC boot after stable 5V rail. Use Value: 23µA quiescent current enables <50µA system sleep current; 2.1MHz switching allows compact 14mm × 14mm layout avoiding interference with RF receivers. | Use Scenario: Supplies 1.0V/2.5A core voltage to 77GHz radar SoC in front-end sensor module exposed to under-hood temperatures. IC Role / Device Role / Timing Role: High-efficiency step-down converter with 50ns min on-time enabling 12V-to-1V conversion at 2.1MHz; thermal shutdown protects against sustained 125°C ambient. Use Value: RθJA = 43.1°C/W and PowerPAD™ allow full 3.25A output at +85°C ambient; CISPR 25 compliance prevents radar signal corruption from switching noise. |
| Automotive Body Control Module (BCM) | LED Headlamp Driver Power Stage |
Use Scenario: Provides 3.3V/1.5A supply for microcontroller, LIN transceivers, and sensor interfaces in door module with wake-on-LIN capability. IC Role / Device Role / Timing Role: Always-on buck regulator with precision enable (VEN-L = 0.94V) enabling wake from deep sleep via LIN bus voltage detection. Use Value: 23µA IQ and 0.94V enable threshold allow reliable wake-up from 12V battery at 9V brownout; FPWM mode ensures constant frequency during PWM dimming control. | Use Scenario: Generates 12V/2A bias supply for LED driver ICs controlling adaptive front lighting (AFS) matrix beams. IC Role / Device Role / Timing Role: High-input-voltage buck converter stepping 14V alternator output to stable 12V rail; SYNC/MODE pin synchronized to vehicle clock to avoid beat frequencies. Use Value: 32V max input withstands load-dump transients; pseudo-random spread spectrum eliminates audible noise in LED drivers and meets CISPR 25 Class 5. |
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 | WSON-12 package (3mm × 3mm), 36V max input, same 3.25A rating and feature set but no PowerPAD™ thermal pad. | Better suited for space-constrained modules where board area is premium and thermal load is lower than HTSSOP use cases. | Select when footprint size is critical and ambient temperature remains below +70°C; verify thermal performance with reduced copper area. |
| LM63615DQPWPRQ1 | Same HTSSOP-16 package and pinout, but rated for 1.5A output current and lower RDS(on) (HS: 75mΩ, LS: 48mΩ). | Targeted at lower-power domains like telematics or gateway ECUs where 1.5A suffices and efficiency at light load is prioritized. | Choose for cost-optimized designs with lower current demand; retains identical layout, BOM, and firmware compatibility. |
Compared with LM63625DQDRRRQ1 and LM63615DQPWPRQ1, the LM63635DQPWPRQ1 delivers highest current (3.25A) in the HTSSOP package with superior thermal performance (RθJA = 43.1°C/W) and full automotive-grade transient robustness (32V input), making it optimal for high-power infotainment and ADAS subsystems.
Availability
LM63635DQPWPRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS sensor processing, and body electronics applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM63635DQPWPRQ1 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 ICs, with decades of automotive qualification expertise and functional safety infrastructure.
The LM63635-Q1 product line delivers high-reliability, AEC-Q100-qualified DC/DC converters optimized for automotive power systems demanding wide input range, low IQ, EMI robustness, and seamless integration into ASIL-compliant architectures.
FAQ
What is the maximum input voltage rating for LM63635DQPWPRQ1?
The LM63635DQPWPRQ1 has a maximum input voltage rating of 32V when used in the HTSSOP-16 (PWP) package, as specified in Section 6.3 Recommended Operating Conditions. This rating accommodates automotive load-dump transients and ensures safe operation across the full vehicle battery voltage range. Exceeding 32V may cause permanent damage per Absolute Maximum Ratings.
How does the RESET pin on LM63635DQPWPRQ1 function in system power sequencing?
The RESET pin on LM63635DQPWPRQ1 is an open-drain power-good flag that asserts low when EN = low or FB voltage falls below 93% of target (e.g., 4.65V for 5V output). It releases high after tRISE-DELAY (3ms typical) once FB stabilizes above 112% of target. This enables precise sequencing of downstream processors or FPGAs, and LM63635DQPWPRQ1's internal hysteresis (1.8%) prevents chatter during marginal conditions.
Can LM63635DQPWPRQ1 operate in forced PWM mode, and how is it configured?
Yes, LM63635DQPWPRQ1 supports forced PWM (FPWM) mode, which maintains constant switching frequency regardless of load. To configure FPWM, tie the SYNC/MODE pin to VCC. This disables automatic PFM entry at light load, ensuring predictable EMI profile and eliminating low-frequency output ripple-critical for noise-sensitive analog circuits. FPWM mode is confirmed in Table 7-1 and Section 7.3.1 of the datasheet.
What is the purpose of the DAP pin on LM63635DQPWPRQ1, and how should it be connected?
Pin 17 (DAP) on LM63635DQPWPRQ1 is the exposed thermal pad, serving as both electrical ground and primary heat sink. It must be soldered to a large, low-thermal-resistance PCB copper area connected to system ground. TI recommends ≥4 thermal vias (0.3mm diameter) under the pad to inner ground planes. Proper DAP connection reduces junction-to-board thermal resistance to 4.5°C/W, enabling full 3.25A output at elevated ambient temperatures.
Does LM63635DQPWPRQ1 support adjustable output voltage, and what is the required external configuration?
Yes, LM63635DQPWPRQ1 supports adjustable output voltage from 1V to 20V via the FB pin. To enable this mode, connect a 10kΩ resistor from the VSEL pin to AGND at power-up. Then use an external resistor divider between VOUT and AGND, with the FB pin connected to the divider midpoint. The internal reference is 1.0V, so VOUT = 1.0V × (1 + R1/R2). This configuration is validated in Section 7.3.2 and Figure 8-2 of the datasheet.
LM63635DQPWPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- 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 ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM63635DQPWPRQ1 FAQ
1.How can I place an order for LM63635DQPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM63635DQPWPRQ1 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 LM63635DQPWPRQ1 reliable?
The price and inventory of LM63635DQPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM63635DQPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LM63635DQPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM63635DQPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM63635DQPWPRQ1?
LM63635DQPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM63635DQPWPRQ1 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 LM63635DQPWPRQ1?
For technical support, including LM63635DQPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM63635DQPWPRQ1 requirements.
6.How does Aetrix verify that LM63635DQPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM63635DQPWPRQ1 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 LM63635DQPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM63635DQPWPRQ1?
All LM63635DQPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM63635DQPWPRQ1, 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 LM63635DQPWPRQ1 part is unused and in its original packaging.
Return procedure for LM63635DQPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM63635DQPWPRQ1 Tags
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TPS562201DDCR
Texas Instruments
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MC34063ABD-TR
STMicroelectronics
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TPS561201DDCR
Texas Instruments
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MC33063ADR
Texas Instruments
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MC34063ADR
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TPS560200DBVR
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AP3012KTR-G1
Diodes Incorporated
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TLV61048DBVR
Texas Instruments
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AZ34063UMTR-G1
Diodes Incorporated
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TPS562200DDCR
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AP62300TWU-7
Diodes Incorporated
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MC34063EBD-TR
STMicroelectronics
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