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Texas Instruments LM53635NQRNLTQ1
- Part No.:
- LM53635NQRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM53635NQRNLTQ1.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,104
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Product details
Overview
LM53635NQRNLTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering 3.5-A output at 3.3 V with 2.1-MHz fixed switching frequency, ±1% output voltage tolerance (–40°C to +125°C), 15-µA quiescent current at no load, and 36-V max input voltage with 42-V transient tolerance - used in instrument clusters and telematics power rails.
For engineers reviewing the LM53635NQRNLTQ1 datasheet, LM53635NQRNLTQ1 pinout, LM53635NQRNLTQ1 application, or LM53635NQRNLTQ1 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 12-V battery-derived power systems.
Technical Context
The LM53635NQRNLTQ1 employs peak-current-mode control with adaptive off-time spreading to maintain regulation down to 300-mV dropout at 3.5 A while sustaining 2.1-MHz operation across wide VIN/VOUT ratios - enabling 18-V-to-3.3-V conversion without frequency foldback. Its HotRod QFN package minimizes switch-node ringing via reduced parasitic inductance and supports wettable flanks for automated optical inspection.
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), FPWM mode control, and dual-power-ground architecture (PGND1/PGND2) with dedicated AVIN and BIAS pins for analog stability and efficiency optimization under dynamic load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5 A continuous - supports automotive infotainment SoCs and display drivers without external current boosting. |
| Input Voltage Range | 3.55 V to 36 V - enables cold-crank operation (≥3.55 V) and withstands 42-V load-dump transients ≤500 ms. |
| Switching Frequency | 2.1 MHz nominal - places fundamental switching noise above AM band (1.6 MHz), reducing EMI filter size and cost. |
| Quiescent Current | 15 µA typical at 3.3-V output, no load - eliminates need for backup LDO in always-on vehicle modules. |
| Output Voltage Accuracy | ±1% over –40°C to +125°C junction - ensures stable MCU core voltage under full automotive ambient range. |
| Dropout Voltage | 0.6 V at 3.5 A, 105°C TA - maintains regulation during low-battery conditions with minimal headroom loss. |
| RESET Function | Open-drain output with 3-ms release timer and 12–45 µs internal glitch filter - replaces discrete supervisor ICs. |
Pinout & Package
LM53635NQRNLTQ1 uses a 5.0-mm × 4.0-mm VQFN-HR (RNL) package with 22 pins and wettable flanks for solder-joint inspection. Thermal resistance: RθJA = 29.4°C/W, RθJC(bot) = 2.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal 3.1-V LDO output | Supplies internal control circuitry; 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); enables multi-rail synchronization. |
| PVIN1 / PVIN2 | Main power inputs | Dual VIN pins reduce IR drop and loop inductance; must be shorted on PCB with PGND planes. |
| SW | Switch node | Connects directly to power inductor; critical for EMI layout - minimized ring due to HotRod packaging. |
| PGND1 / PGND2 | Power ground terminals | Eight dedicated ground pins (4+4) lower impedance path for high di/dt return currents. |
| FB | Feedback input | Monitors 3.3-V output directly (fixed version); no external divider needed - saves board space and leakage. |
| EN | Enable input | Active-high logic; threshold 1.7–2.0 V; hysteresis 0.45–0.55 V prevents chatter during slow-rising battery rails. |
| RESET | Open-drain fault flag | Asserts low on UVLO, thermal shutdown, or EN deactivation; includes internal 3-ms release timer. |
| FPWM | Forced PWM mode control | High = fixed 2.1-MHz operation; low = automatic light-load PFM/diode emulation for ultra-low IQ. |
| BIAS | Auxiliary bias supply input | Connected to output rail; improves efficiency and reduces VCC LDO loading at high IOUT. |
| AVIN | Analog input reference | Tied to PVIN on PCB; supplies precision analog blocks (error amp, reference) independent of power-switch noise. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2.5 kV and CDM ±1 kV ESD robustness. |
| Low EMI HotRod QFN | Flip-chip construction reduces switch-node parasitic inductance, cutting radiated emissions by >10 dB vs standard QFN. |
| Spread-spectrum modulation | ±3% frequency dithering centered at 2.1 MHz lowers peak EMI amplitude without affecting regulation or timing. |
| Integrated RESET with filtering | Eliminates external supervisor IC: built-in 3-ms release timer and 12–45 µs glitch filter ensure clean system reset. |
| Pin-selectable forced PWM | FPWM pin enables deterministic 2.1-MHz operation across all loads - essential for noise-sensitive ADC or RF subsystems. |
| Built-in soft-start | 3.2-ms typical ramp time prevents inrush current and output overshoot during startup into large capacitive loads. |
Applications
| Telematics Power Supply | Instrument Cluster Core Rail |
|---|---|
Use Scenario: Powers LTE modem, GNSS receiver, and CAN controller in vehicle connectivity modules operating from 12-V battery with cold-crank and load-dump stress. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying digital baseband and RF ICs with tight voltage accuracy and low noise. Use Value: 15-µA quiescent current extends battery life in parked-telematics mode; 42-V transient tolerance avoids external TVS clamping. |
Use Scenario: Delivers stable 3.3-V supply to microcontroller, TFT display driver, and sensor interface in digital instrument panels. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with RESET signal used for MCU brown-out detection and safe boot sequencing. Use Value: ±1% output tolerance ensures reliable MCU operation across temperature; integrated RESET removes need for discrete supervisor. |
| Head Unit Audio DSP Rail | ADAS Camera Interface Power |
Use Scenario: Supplies low-noise 3.3-V rail to audio DSP and codec in infotainment head units where EMI must avoid FM band interference. IC Role / Device Role / Timing Role: Synchronous buck converter with 2.1-MHz switching placed above AM band (1.6 MHz), minimizing conducted EMI into analog audio paths. Use Value: Spread-spectrum option further reduces peak EMI; HotRod package suppresses switch-node ringing that couples into sensitive analog circuits. |
Use Scenario: Powers image signal processor and serializer in rear-view or surround-view camera modules exposed to engine bay temperatures up to +105°C ambient. IC Role / Device Role / Timing Role: Automotive-grade buck regulator delivering 3.5-A peak current with 150°C max junction rating and thermal shutdown at 155–175°C. Use Value: 0.6-V dropout at 3.5 A ensures regulation during low-battery cranking; wettable flanks enable AOI verification in high-reliability camera PCB assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53635MQRNLTQ1 | Same 3.3-V fixed output, but includes spread-spectrum EMI reduction (±3%) - LM53635NQRNLTQ1 lacks this feature. | Preferred where strict CISPR 25 Class 5 radiated emissions compliance is required without external filtering. | Select LM53635MQRNLTQ1 if EMI certification margin is critical; otherwise LM53635NQRNLTQ1 offers simpler layout and lower cost. |
| TPS54335AQDDARQ1 | 3.5-A, 36-V buck with adjustable output (0.8–3.5 V), 2.2-MHz switching, but no integrated RESET or spread spectrum. | Suitable for designs requiring programmable VOUT or tighter output adjustability; lacks automotive RESET integration. | Choose TPS54335AQDDARQ1 when output voltage flexibility outweighs need for built-in RESET and EMI features. |
Compared with LM53635NQRNLTQ1, LM53635MQRNLTQ1 adds spread-spectrum capability for enhanced EMI control without changing footprint or BOM count, while TPS54335AQDDARQ1 trades integrated supervision and fixed 3.3-V simplicity for output adjustability and slightly higher frequency - making each optimal for distinct automotive subsystem priorities.
Availability
LM53635NQRNLTQ1 is available at Aetrix Electronics and suitable for telematics, instrument cluster, and head unit power designs requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.
Supply support for LM53635NQRNLTQ1 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 LM53635-Q1 product line delivers high-efficiency, low-EMI synchronous buck regulators optimized for 12-V battery-derived power rails in infotainment, ADAS, and body electronics - emphasizing AEC-Q100 reliability, thermal robustness, and system-level integration.
FAQ
What is the maximum junction temperature rating for LM53635NQRNLTQ1?
The LM53635NQRNLTQ1 is rated for a maximum junction temperature of +150°C, with thermal shutdown activated between 155°C and 175°C. This allows operation in under-hood environments up to +105°C ambient while maintaining 1000-hour lifetime at ≤125°C junction - fully compliant with AEC-Q100 Grade 1 requirements. The device's RθJC(bot) of 2.4°C/W enables efficient heat transfer to the PCB ground plane.
Does LM53635NQRNLTQ1 require an external feedback resistor divider?
No, LM53635NQRNLTQ1 does not require an external feedback resistor divider because it is a fixed 3.3-V output variant. The FB pin connects directly to the output node for regulation, eliminating component count, board space, and potential accuracy drift from external resistors - a key advantage over adjustable buck controllers in cost- and reliability-sensitive automotive applications.
What is the purpose of the BIAS pin on LM53635NQRNLTQ1?
The BIAS pin on LM53635NQRNLTQ1 connects to the regulated 3.3-V output to power the internal LDO that supplies the control circuitry. This improves efficiency by reducing the voltage drop across the internal VCC regulator, especially at high load currents, and lowers overall quiescent current - contributing to the 15-µA no-load IQ specification when configured with BIAS tied to VOUT.
Can LM53635NQRNLTQ1 synchronize to an external clock?
Yes, LM53635NQRNLTQ1 supports external frequency synchronization via the SYNC pin, which accepts a 1.9–2.3 MHz square-wave clock with ≥25% duty cycle. This enables precise timing alignment across multiple power rails in complex automotive ECUs - preventing beat frequencies and simplifying EMI filter design by ensuring all converters switch at harmonically related frequencies.
How does the RESET output function on LM53635NQRNLTQ1?
The RESET output on LM53635NQRNLTQ1 is an open-drain flag that goes low during undervoltage lockout, thermal shutdown, or when EN is deasserted. It includes a built-in 3-ms release timer and 12–45 µs glitch filter, providing a clean, debounced system reset signal - eliminating the need for external RC networks or dedicated supervisor ICs in automotive microcontroller boot sequencing.
LM53635NQRNLTQ1 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.9V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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)
LM53635NQRNLTQ1 FAQ
1.How can I place an order for LM53635NQRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53635NQRNLTQ1 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 LM53635NQRNLTQ1 reliable?
The price and inventory of LM53635NQRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53635NQRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LM53635NQRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53635NQRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53635NQRNLTQ1?
LM53635NQRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53635NQRNLTQ1 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 LM53635NQRNLTQ1?
For technical support, including LM53635NQRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53635NQRNLTQ1 requirements.
6.How does Aetrix verify that LM53635NQRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LM53635NQRNLTQ1 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 LM53635NQRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LM53635NQRNLTQ1?
All LM53635NQRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53635NQRNLTQ1, 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 LM53635NQRNLTQ1 part is unused and in its original packaging.
Return procedure for LM53635NQRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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