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Texas Instruments LM53635MQURNLRQ1
- Part No.:
- LM53635MQURNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM53635MQURNLRQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,904
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Product details
Overview
LM53635MQURNLRQ1 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; operates from 3.55 V to 36 V input with 2.1-MHz fixed switching frequency, ±1% output voltage accuracy over –40°C to +125°C, and 15-µA quiescent current (typical) in light-load mode - deployed in instrument clusters and telematics power rails.
For engineers reviewing the LM53635MQURNLRQ1 datasheet, LM53635MQURNLRQ1 pinout, LM53635MQURNLRQ1 application, or LM53635MQURNLRQ1 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/24-V automotive systems.
Technical Context
The LM53635MQURNLRQ1 uses peak-current-mode control with adaptive frequency spreading to maintain regulation down to 300-mV dropout at 3.5 A while preserving 2.1-MHz operation above 3.9 V input; minimum on/off times of 65 ns / 60 ns enable stable 18 V → 3.3 V conversion at full frequency.
Its HotRod QFN package integrates wettable flanks (not present on this variant), low-inductance flip-chip layout, and dual PGND banks to minimize switch-node ringing and radiated EMI; internal 3.1-V LDO powers control circuitry, and BIAS pin enables efficient auxiliary biasing from output voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5 A continuous - supports automotive infotainment SoCs and ADAS domain controllers without external current boosting. |
| Input Voltage Range | 3.55 V to 36 V - sustains operation during cold-crank (≥3.55 V) and handles load-dump transients up to 42 V for ≤500 ms. |
| Switching Frequency | 2.1 MHz nominal - places fundamental switching noise above AM band (1.6 MHz), reducing EMI filter size and cost. |
| Output Voltage Accuracy | ±1% over –40°C to +125°C junction - ensures stable MCU core voltage under full automotive ambient range. |
| Quiescent Current | 15 µA typical at no load (3.3-V output) - eliminates need for backup LDO in always-on vehicle networks. |
| Reset Output | Open-drain with 3-ms release timer and internal glitch filtering - replaces discrete supervisor ICs in safety-critical boot sequencing. |
| Thermal Rating | Junction temperature rated to +150°C - qualified for under-hood placement with 1000-hour lifetime at 125°C junction. |
| Package | VQFN-HR (RNL), 5.0 mm × 4.0 mm, 22-pin - non-wettable flank variant optimized for standard reflow without X-ray inspection dependency. |
Pinout & Package
VQFN-HR (RNL) 22-pin package, 5.0 mm × 4.0 mm body, 0.6-mm pin pitch, non-wettable flanks - designed for automotive PCB assembly with standard solder paste and optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal LDO output | 3.1-V supply for internal logic; requires 4.7-µF capacitor to AGND for stability. |
| CBOOT | Bootstrap capacitor node | Connects 470-nF ceramic cap to SW; enables high-side MOSFET gate drive above VIN. |
| SYNC | External clock input | Accepts 1.9–2.3 MHz system clock (rising-edge triggered); synchronizes switching to avoid beat frequencies. |
| PVIN1, PVIN2 | Main power inputs | Parallel high-current VIN paths; must be shorted together on PCB with local bulk capacitance. |
| SW | Switch node | Connects directly to power inductor; high dv/dt node requiring tight layout and ground shielding. |
| PGND1, PGND2 | Power ground banks | Eight dedicated low-side MOSFET return pins; must be tied together and connected to AGND at single point. |
| AVIN | Analog input reference | Bias source for internal analog circuits; connect to PVIN net for accurate UVLO and regulation. |
| FPWM | Forced PWM mode control | High = fixed 2.1-MHz operation; low = automatic diode-emulation light-load mode. |
| EN | Enable input | Active-high logic; 1.7–2.0 V threshold; internal hysteresis prevents chatter during slow-rising battery rails. |
| RESET | Open-drain fault flag | Asserts low on undervoltage, overtemperature, or EN deactivation; includes 3-ms release timer and 12–45 µs glitch filter. |
| FB | Feedback input | Connects to resistor divider for adjustable output; 1.0-V internal reference enables precise VOUT setting. |
| BIAS | Auxiliary bias input | Connects to regulated output to improve efficiency and reduce quiescent current at light loads. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum operation | ±3% frequency dithering reduces peak EMI by >10 dB without compromising regulation or transient response. |
| Integrated compensation | Single external FB resistor divider suffices; no loop compensation components required for stable 3.5-A operation. |
| Low-dropout capability | Maintains regulation with only 300-mV VIN–VOUT differential at 3.5 A - critical for cold-crank 12-V systems. |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), HBM ±2.5 kV, CDM ±1 kV - certified for front-end power delivery. |
| Thermal shutdown | 155°C trip with 15°C hysteresis - protects against sustained overload while allowing brief peak-current bursts. |
| Soft-start timing | 2–5 ms ramp to 90% of target output - prevents inrush current and stabilizes downstream LDOs during startup. |
Applications
| Telematics Control Unit | Instrument Cluster Display |
|---|---|
Use Scenario: Powers LTE modem, GNSS receiver, and CAN gateway in vehicle connectivity module operating across battery voltage swings and thermal extremes. IC Role / Device Role / Timing Role: Primary 3.3-V/5-V step-down regulator supplying digital baseband and RF subsystems with low-noise, high-efficiency conversion. Use Value: 15-µA quiescent current extends battery life during sleep mode; 2.1-MHz switching avoids interference with cellular bands. |
Use Scenario: Supplies TFT-LCD backlight driver, microcontroller, and graphics processor in digital dashboard with strict EMI limits. IC Role / Device Role / Timing Role: High-current buck converter delivering stable 3.3-V rail to display controller with fast transient response to brightness changes. Use Value: Spread-spectrum mode reduces radiated emissions below CISPR-25 Class 5 limits; RESET output validates power integrity before UI initialization. |
| ADAS Camera Module | Body Control Module |
Use Scenario: Powers image sensor, ISP, and serializer in rear-view or surround-view camera exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Input-tolerant buck regulator converting 12-V battery to 1.8-V/3.3-V rails with robust cold-crank support. Use Value: 3.55-V minimum input enables uninterrupted operation during engine start; 150°C junction rating supports sealed housing placement. |
Use Scenario: Regulates power for door lock actuators, window lift motors, and LED interior lighting in centralized body electronics. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter replacing linear regulators to reduce heat and extend PCB lifetime. Use Value: 90% efficiency at 3.5 A minimizes thermal stress; FPWM pin allows deterministic timing for synchronized actuator control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53635MQRNLRQ1 | Same 3.5-A rating and spread-spectrum feature, but uses wettable-flank VQFN package for automated optical inspection. | Preferred where X-ray-free solder joint verification is mandated in Tier-1 production lines. | Select when board-level AOI capability exists and wettable flanks are specified in manufacturing requirements. |
| LM53625MQURNLRQ1 | 2.5-A version with identical pinout, spread-spectrum, and non-wettable flank package - lower current limit and reduced thermal margin. | Suitable for lower-power domains like audio amplifiers or sensor hubs where 3.5 A headroom is unnecessary. | Choose when load current stays ≤2.5 A and cost reduction via derating is acceptable without redesign. |
Compared with LM53635MQURNLRQ1, LM53635MQRNLRQ1 offers enhanced manufacturability at identical electrical performance, while LM53625MQURNLRQ1 trades 1-A output capacity for lower BOM cost in less demanding subsystems - both require no PCB layout change but differ in thermal derating and inspection protocol alignment.
Availability
LM53635MQURNLRQ1 is available at Aetrix Electronics and suitable for telematics, instrument cluster, ADAS camera, and body control module applications requiring stable component supply across extended automotive lifecycles.
Supply support for LM53635MQURNLRQ1 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 AEC-Q100 validation experience.
The LM536xx-Q1 product line delivers high-frequency, low-quiescent-current buck converters engineered specifically for automotive power rails where cold-crank resilience, EMI compliance, and long-term reliability are mandatory.
FAQ
What is the minimum input voltage required for LM53635MQURNLRQ1 to regulate a 3.3-V output at full 3.5-A load?
The LM53635MQURNLRQ1 maintains regulation at 3.5 A with a minimum input voltage of 3.9 V for a 3.3-V output after startup, per Section 7.3 Recommended Operating Conditions. Below 3.9 V, dropout behavior begins; at 3.55 V input, it sustains regulation only at reduced load or with frequency spreading enabled - verified in Table 7.6 System Characteristics.
Does LM53635MQURNLRQ1 support external synchronization, and what is its valid SYNC frequency range?
Yes, LM53635MQURNLRQ1 accepts an external clock on the SYNC pin to synchronize switching frequency. The valid range is 1.9 MHz to 2.3 MHz, with rising-edge triggering and 25%–75% duty cycle tolerance - specified in Section 7.5 Electrical Characteristics under FSYNC and DSYNC parameters.
How does the RESET output of LM53635MQURNLRQ1 behave during startup and fault conditions?
The LM53635MQURNLRQ1 RESET output remains low until the output reaches 105%–110% of target voltage, then releases high after a 2–4 ms delay. It asserts low again on EN deactivation, UVLO, or thermal shutdown, with built-in 12–45 µs glitch filtering - detailed in Section 7.5 RESET parameter table and Figure 7-7.
Is LM53635MQURNLRQ1 compatible with wettable-flank inspection processes?
No, LM53635MQURNLRQ1 uses the non-wettable flank variant of the VQFN-HR package (as confirmed in Table 5-2 and device marking "QUR"). For AOI-compatible alternatives, LM53635MQRNLRQ1 provides identical electrical specs with wettable flanks.
What thermal metrics apply to LM53635MQURNLRQ1 in its 5.0-mm × 4.0-mm VQFN package?
LM53635MQURNLRQ1 has RθJA = 29.4°C/W, RθJC(bot) = 2.4°C/W, and RθJB = 5.4°C/W - enabling 3.5-A operation with ≤25°C rise above ambient on 2-layer 2-oz copper PCB per Section 7.4 Thermal Information. Junction-to-case (top) ψJT is 1.2°C/W for heatsink attachment evaluation.
LM53635MQURNLRQ1 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)
LM53635MQURNLRQ1 FAQ
1.How can I place an order for LM53635MQURNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53635MQURNLRQ1 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 LM53635MQURNLRQ1 reliable?
The price and inventory of LM53635MQURNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53635MQURNLRQ1 is usually 5 days.
3.What payment methods are accepted for LM53635MQURNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53635MQURNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53635MQURNLRQ1?
LM53635MQURNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53635MQURNLRQ1 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 LM53635MQURNLRQ1?
For technical support, including LM53635MQURNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53635MQURNLRQ1 requirements.
6.How does Aetrix verify that LM53635MQURNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LM53635MQURNLRQ1 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 LM53635MQURNLRQ1 meets industry standards.
7.What is the process for return or replacement of LM53635MQURNLRQ1?
All LM53635MQURNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53635MQURNLRQ1, 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 LM53635MQURNLRQ1 part is unused and in its original packaging.
Return procedure for LM53635MQURNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM53635MQURNLRQ1 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
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