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Texas Instruments LM53635MQRNLTQ1
- Part No.:
- LM53635MQRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM53635MQRNLTQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,372
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Product details
Overview
LM53635MQRNLTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering up to 3.5 A at 3.3 V, 5 V, or adjustable output; features 2.1-MHz fixed-frequency operation, 15-µA quiescent current (typical, 3.3-V output), ±1% output voltage tolerance (–40°C to 125°C), and 36-V max input with 42-V transient tolerance-used in automotive telematics power rails.
For engineers reviewing the LM53635MQRNLTQ1 datasheet, LM53635MQRNLTQ1 pinout, LM53635MQRNLTQ1 application, or LM53635MQRNLTQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and EMI performance, and real-world selection guidance for high-reliability vehicle electronics design.
Technical Context
The LM53635MQRNLTQ1 implements peak-current-mode control with adaptive frequency spreading to maintain regulation down to 300-mV dropout at 3.5 A while sustaining 2.1-MHz nominal switching-enabling compact 5.0-mm × 4.0-mm VQFN-HR layout. Its flip-chip HotRod package minimizes parasitic inductance, reducing switch-node ringing and radiated EMI without external filters.
It integrates internal compensation, soft-start (3.2-ms typical), open-drain RESET with 3-ms release timer and built-in glitch filtering (12–45 µs), plus pin-selectable forced PWM mode via FPWM input. The device supports external synchronization (1.9–2.3 MHz) and operates across –40°C to +150°C junction temperature with AEC-Q100 HBM ±2500 V and CDM ±1000 V ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5 A continuous-supports high-power automotive loads like head unit SoCs without external current boosting. |
| Input Voltage Range | 3.55 V to 36 V-enables direct battery connection (cold-crank 6 V) and simplifies surge protection for 12-V/24-V systems. |
| Switching Frequency | 2.1 MHz nominal-permits use of small 1-µH inductors and avoids AM-band interference in infotainment systems. |
| Quiescent Current | 15 µA typical (3.3-V output, no load)-meets automotive always-on requirements without auxiliary LDOs. |
| Output Voltage Accuracy | ±1% over –40°C to +125°C TJ-ensures stable MCU/Sensor rail compliance across full vehicle operating range. |
| Dropout Voltage | 0.6 V at 3.5 A, 105°C TA-maintains regulation during low-input transients (e.g., engine start). |
| RESET Function | Open-drain output with 3-ms release timer and 12–45 µs glitch filter-replaces discrete supervisor ICs in cluster/telematics designs. |
Pinout & Package
LM53635MQRNLTQ1 uses a 22-pin VQFN-HR (RNL) package measuring 5.0 mm × 4.0 mm with wettable flanks for optical solder-joint inspection. Thermal resistance is RθJA = 29.4°C/W (JEDEC high-K board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal 3.1-V LDO output | Power source for internal logic; requires 4.7-µF capacitor to AGND for stability. |
| CBOOT | Bootstrap capacitor node | Connects 470-nF capacitor to SW to drive high-side MOSFET gate above VIN. |
| SYNC | External clock input | Accepts 1.9–2.3 MHz system clock (rising-edge triggered) for EMI reduction via synchronization. |
| PVIN1 / PVIN2 | Main power inputs | Dual VIN pins reduce PCB trace inductance; must be shorted together on board with local bypass caps. |
| SW | Switch node | Connects directly to power inductor; high dv/dt node requiring tight layout to minimize EMI. |
| PGND1 / PGND2 | Power ground terminals | Eight dedicated ground pins-must be tied together and connected to AGND/system ground for low-impedance return path. |
| FB | Feedback input | For adjustable version: connects to resistor divider; for fixed versions: internally tied to output. |
| EN | Enable control | Active-high input (1.7–2.0 V threshold); internal hysteresis prevents chatter during slow-rising battery rails. |
| RESET | Open-drain fault flag | Asserts low on UVLO, thermal shutdown, or EN deactivation; requires external pull-up resistor. |
| FPWM | Forced PWM mode select | High = fixed 2.1-MHz operation; low = automatic light-load diode emulation for ultra-low IQ. |
| BIAS | Auxiliary bias supply input | Connected to output rail to improve efficiency and reduce dropout at light loads. |
| AVIN | Analog supply reference | Tied to PVIN on PCB; supplies analog circuitry including error amplifier and reference. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | Reduces peak EMI by ±3% frequency dithering-enables compliance with CISPR 25 Class 5 without added shielding. |
| Integrated RESET with timing | Eliminates need for external supervisor IC: built-in 3-ms release delay and 12–45 µs glitch filter ensure clean system reset. |
| HotRod QFN with wettable flanks | Flip-chip construction lowers parasitic inductance by >50% vs standard QFN-minimizing switch-node overshoot and improving efficiency. |
| Low dropout architecture | Maintains regulation at 300-mV VIN–VOUT differential under full 3.5-A load-critical for cold-crank operation in 12-V systems. |
| Pin-selectable forced PWM | FPWM pin enables deterministic 2.1-MHz operation regardless of load-essential for noise-sensitive audio or radar subsystems. |
Applications
| Telematics Control Unit | Automotive Head Unit |
|---|---|
Use Scenario: Powers LTE modem, GNSS receiver, and microcontroller in connected car telematics modules. IC Role / Device Role / Timing Role: Primary 3.3-V/5-V step-down regulator supplying core logic and RF ICs. Use Value: 15-µA quiescent current extends battery backup runtime; 42-V transient tolerance survives jump-start events. |
Use Scenario: Supplies SoC, display controller, and audio codec in infotainment head units. IC Role / Device Role / Timing Role: High-efficiency 3.5-A buck converter with spread spectrum to meet CISPR 25 EMI limits. Use Value: 2.1-MHz switching enables <10-mm² total solution size; integrated RESET replaces discrete supervisor. |
| Instrument Cluster Display | ADAS Camera Power Rail |
Use Scenario: Delivers stable 5-V rail to TFT-LCD driver and microcontroller in digital instrument clusters. IC Role / Device Role / Timing Role: Fixed-output 5-V buck regulator with ±1% accuracy across –40°C to +125°C ambient. Use Value: AEC-Q100 Grade 1 qualification ensures reliability in high-temperature dashboard environments. |
Use Scenario: Provides clean 3.3-V supply to image sensor and ISP in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Low-noise adjustable buck converter with FPWM mode for EMI-controlled imaging paths. Use Value: Pin-selectable forced PWM eliminates frequency modulation artifacts in video signal chain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM536353QRNLTQ1 | Fixed 3.3-V output; no spread spectrum; same 3.5-A rating and package. | Used where EMI is less critical and output voltage is fixed-reduces BOM count by eliminating feedback resistors. | Select when system requires guaranteed 3.3-V output without adjustment and lower cost is prioritized over EMI optimization. |
| LM61480QRNXTQ1 | Higher 8-A rating, 2.2-MHz switching, lower 5.5-µA IQ, but larger 6.0-mm × 5.0-mm VQFN. | Suitable for next-gen ADAS ECUs needing higher current headroom and tighter thermal margins. | Choose when future-proofing for >5-A loads or when footprint expansion is acceptable for improved efficiency and lower IQ. |
Compared with LM53635MQRNLTQ1, LM536353QRNLTQ1 offers simpler fixed-voltage implementation at the expense of EMI flexibility, while LM61480QRNXTQ1 trades smaller size for significantly higher current capability and lower quiescent consumption-making it appropriate for scalable platform designs.
Availability
LM53635MQRNLTQ1 is available at Aetrix Electronics and suitable for automotive telematics, head unit, and instrument cluster applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM53635MQRNLTQ1 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 and embedded processing technologies, with deep expertise in automotive power management and functional safety.
LM53635MQRNLTQ1 belongs to TI's automotive-qualified DC-DC converter portfolio, designed specifically for high-reliability vehicle subsystems demanding wide input range, low EMI, and extended temperature operation.
FAQ
What is the maximum input voltage transient rating for LM53635MQRNLTQ1?
The LM53635MQRNLTQ1 supports input transients up to 42 V for ≤500 ms at ≤0.01% duty cycle-enabling robust operation during jump-start or load-dump events in 12-V automotive systems without external TVS clamping.
Does LM53635MQRNLTQ1 require external compensation components?
No, LM53635MQRNLTQ1 features fully integrated compensation-no external RC network is needed. This reduces BOM count, PCB area, and design validation effort while maintaining stability across all supported output voltages and load conditions.
How does the RESET output of LM53635MQRNLTQ1 behave during startup?
The LM53635MQRNLTQ1 RESET output remains low until the output reaches 96% of its final value and remains stable for ≥3 ms. It then asserts high, providing a reliable power-good signal for downstream processors without requiring external timing circuits.
Can LM53635MQRNLTQ1 operate with an input voltage below 3.55 V?
Yes-LM53635MQRNLTQ1 can regulate from as low as 3.55 V (typical) at full 3.5-A load when configured for 3.3-V output. Below this, dropout behavior occurs; minimum operating VIN is 3.2 V (rising) per absolute specs, but regulation is not guaranteed.
Is LM53635MQRNLTQ1 pin-compatible with LM53625MQRNLTQ1?
Yes-LM53635MQRNLTQ1 and LM53625MQRNLTQ1 share identical 22-pin VQFN-HR (5.0 mm × 4.0 mm) packaging, pinout, and footprint. They differ only in rated output current (3.5 A vs 2.5 A) and internal current-limit thresholds, enabling drop-in upgrade paths.
LM53635MQRNLTQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 22-PowerVFQFN
- 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):
- 3.9V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 10V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 22-VQFN-HR (5x4)
LM53635MQRNLTQ1 FAQ
1.How can I place an order for LM53635MQRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53635MQRNLTQ1 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 LM53635MQRNLTQ1 reliable?
The price and inventory of LM53635MQRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53635MQRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LM53635MQRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53635MQRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53635MQRNLTQ1?
LM53635MQRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53635MQRNLTQ1 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 LM53635MQRNLTQ1?
For technical support, including LM53635MQRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53635MQRNLTQ1 requirements.
6.How does Aetrix verify that LM53635MQRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LM53635MQRNLTQ1 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 LM53635MQRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LM53635MQRNLTQ1?
All LM53635MQRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53635MQRNLTQ1, 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 LM53635MQRNLTQ1 part is unused and in its original packaging.
Return procedure for LM53635MQRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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