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Texas Instruments LM53635MQRNLRQ1
- Part No.:
- LM53635MQRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM53635MQRNLRQ1.pdf
- Description:
- IC REG BUCK 5V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,874
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Product details
Overview
LM53635MQRNLRQ1 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, with 2.1-MHz fixed switching frequency, 36-V max input, and 15-µA quiescent current (typical at 3.3-V output). It operates from –40°C to +125°C ambient and supports telematics power rails.
For engineers reviewing the LM53635MQRNLRQ1 datasheet, LM53635MQRNLRQ1 pinout, LM53635MQRNLRQ1 application, or LM53635MQRNLRQ1 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 subsystems.
Technical Context
The LM53635MQRNLRQ1 employs 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 operation across wide VIN–VOUT ratios - including 18 V → 3.3 V conversion. Its HotRod QFN package minimizes parasitic inductance, reducing switch-node ringing and radiated EMI.
It integrates internal compensation, soft-start, overcurrent protection (HS/LS current limits), thermal shutdown, UVLO, and a filtered open-drain RESET output with 3-ms release timer. The FPWM pin enables forced PWM mode, disabling light-load diode emulation for constant-frequency operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5 A continuous - supports instrument cluster and head unit main rail loads without external current boosting |
| Input Voltage Range | 3.55 V to 36 V - enables direct battery connection with transient tolerance up to 42 V for ≤500 ms |
| Switching Frequency | 2.1 MHz (±150 kHz) - places switching above AM band, minimizing input filter size and cost |
| Quiescent Current | 15 µA typical at 3.3-V output - eliminates need for backup LDO in always-on telematics modules |
| Output Voltage Accuracy | ±1% over –40°C to +125°C junction - ensures stable MCU/SOC supply under full automotive temperature range |
| Duty Cycle Range | 13% to 98% - sustains regulation during cold-crank (low VIN) and high-ratio step-down without frequency foldback |
| RESET Output | Open-drain with 3-ms release timer and internal glitch filter - replaces discrete supervisor IC in safety-critical domains |
Pinout & Package
LM53635MQRNLRQ1 uses a 5.0-mm × 4.0-mm VQFN-HR (RNL) package with 22 pins and wettable flanks for automated optical solder-joint inspection.
| 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 |
| SYNC | External clock input | Accepts 1.9–2.3 MHz system clock for synchronization; rising-edge triggered |
| PVIN1 / PVIN2 | Main power inputs | Parallel-connected high-current VIN paths; must be tied together on PCB |
| SW | Switch node | Connects directly to power inductor; critical for EMI layout and thermal path |
| PGND1 / PGND2 | Power ground terminals | Eight dedicated low-side MOSFET return paths; must tie to AGND and system ground |
| FB | Feedback input | Connects to output divider (adjustable) or output node (fixed); 1-V reference sets VOUT |
| BIAS | Auxiliary bias input | Connected to output voltage to improve light-load efficiency and regulation |
| FPWM | Forced PWM mode control | High = constant 2.1-MHz switching; low = automatic light-load diode emulation |
| EN | Enable input | Active-high; threshold 1.7–2.0 V; hysteresis 450–550 mV prevents chatter during brownout |
| RESET | Open-drain fault flag | Asserts low on EN deactivation or output undervoltage; 3-ms release timer ensures clean reset sequencing |
| AGND | Analog ground reference | Reference point for all electrical specs; must connect to PGND with low-inductance trace |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum operation | ±3% frequency dither reduces peak EMI by >10 dB, easing CISPR-25 Class 5 compliance |
| Wettable-flank VQFN package | Enables AOI-based solder-joint verification without X-ray, improving automotive manufacturing yield |
| Integrated BIAS pin regulation | Draws power from output rail to reduce no-load input current to 15 µA - critical for battery-backed modules |
| Low-dropout architecture | Maintains regulation with only 300-mV VIN–VOUT differential at 3.5 A, supporting cold-crank operation |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), HBM ±2.5 kV, CDM ±1 kV - qualified for front-end electronics |
Applications
| Telematics Control Unit | Automotive Head Unit |
|---|---|
Use Scenario: Powering LTE modem, GNSS receiver, and CAN interface in connected car gateway modules with 12-V battery input. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying core logic and RF sections with tight load-transient response. Use Value: 15-µA quiescent current extends battery backup time; spread spectrum meets stringent EMI limits near cellular antennas. |
Use Scenario: Delivering stable 5-V rail to infotainment SoC, display controller, and audio codec in central display systems. IC Role / Device Role / Timing Role: High-current synchronous buck converter enabling compact, fanless head unit design. Use Value: 3.5-A capability and 90% efficiency at full load minimize thermal dissipation; wettable flanks ensure IPC-A-610 Class 3 reliability. |
| Instrument Cluster Display | ADAS Camera Power Module |
Use Scenario: Generating 3.3-V supply for microcontroller, TFT driver, and CAN transceiver in digital instrument clusters. IC Role / Device Role / Timing Role: Automotive-grade DC-DC regulator with RESET output used for safe boot sequencing and fault reporting. Use Value: Integrated 3-ms RESET release timer eliminates external RC network; ±1% accuracy maintains display timing integrity. |
Use Scenario: Providing regulated 3.3-V power to image sensor and ISP in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Compact, low-noise buck converter placed near sensor to minimize noise coupling into analog video path. Use Value: Low EMI switch-node waveform and minimized parasitic inductance prevent image artifacts; 150°C junction rating supports under-hood placement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53635NQRNLRQ1 | Same 3.5-A RNL package, but fixed 3.3-V output (no FB divider required); no spread spectrum | Simpler BOM for fixed-rail designs; lacks EMI reduction feature needed in RF-dense zones | Select when 3.3-V output suffices and EMI margin is ample; saves one resistor vs. LM53635MQRNLRQ1 |
| TPS543B20RTWR | 3.5-A, 18-V max input, 2-MHz sync-buck with PMBus interface; larger 4-mm × 4-mm WQFN | Supports digital configuration and telemetry; not AEC-Q100 qualified; higher IQ (25 µA) | Choose for programmable features in non-safety-critical industrial or prototyping use - not drop-in replacement |
Compared with LM53635NQRNLRQ1 and TPS543B20RTWR, LM53635MQRNLRQ1 uniquely combines AEC-Q100 Grade 1 qualification, spread-spectrum EMI reduction, and adjustable output in a wettable-flank package - making it optimal for production automotive systems requiring flexibility and regulatory compliance.
Availability
LM53635MQRNLRQ1 is available at Aetrix Electronics and suitable for telematics, head unit, instrument cluster, and ADAS camera power applications requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing.
Supply support for LM53635MQRNLRQ1 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 electronics, with decades of automotive qualification expertise and broad power management portfolio.
LM53635MQRNLRQ1 belongs to TI's automotive-qualified DC-DC converter family designed specifically for high-reliability vehicle subsystems - emphasizing low EMI, wide input range, and robust thermal performance in harsh environments.
FAQ
What is the maximum input voltage transient rating for LM53635MQRNLRQ1?
The LM53635MQRNLRQ1 withstands input transients up to 42 V for ≤500 ms at ≤0.01% duty cycle, per its absolute maximum ratings. This enables robust operation during automotive load-dump events without requiring external TVS clamping in many designs - though system-level validation remains essential for specific board layouts and transient profiles. LM53635MQRNLRQ1's internal protection circuits remain functional throughout this stress condition.
Does LM53635MQRNLRQ1 require external compensation components?
No, LM53635MQRNLRQ1 features fully integrated compensation - no external Type II or Type III compensation network is needed. Its internal error amplifier and PWM modulator are factory-tuned for stability with standard output capacitor types (e.g., 22-µF ceramic), simplifying design and reducing BOM count. LM53635MQRNLRQ1 achieves phase margin >45° across temperature and load with recommended external components per the datasheet.
How does the RESET output of LM53635MQRNLRQ1 behave during startup and fault conditions?
The LM53635MQRNLRQ1 RESET output is an open-drain signal that stays low until the output reaches ≥105% of nominal voltage and remains valid for ≥3 ms after stabilization. It asserts low again if output falls below 94% of setpoint or if EN is pulled low. LM53635MQRNLRQ1's internal 12–45 µs glitch filter prevents false triggering from noise. No external pull-up is mandatory but recommended for defined logic levels.
Can LM53635MQRNLRQ1 operate with input voltage below 3.9 V?
Yes - LM53635MQRNLRQ1 supports minimum operating input of 3.55 V (rising) for full functionality at 3.5-A load, per Section 7.3. Below 3.55 V, regulation degrades progressively; dropout voltage is specified as 300 mV at 3.5 A. LM53635MQRNLRQ1 maintains 2.1-MHz switching down to ~3.9 V input, then enters frequency-spreading mode to sustain 98% duty cycle and regulation near VIN ≈ VOUT.
Is LM53635MQRNLRQ1 pin-compatible with LM53625-Q1 variants?
No - LM53635MQRNLRQ1 and LM53625-Q1 share identical 22-pin VQFN-HR (RNL) package and pinout, but differ in internal current-limit thresholds (LM53635 supports 3.5 A vs. LM53625's 2.5 A) and thermal derating curves. LM53635MQRNLRQ1 may be substituted in LM53625 layouts only if the design accommodates higher peak currents and revised thermal margins; electrical behavior otherwise matches.
LM53635MQRNLRQ1 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):
- 5V
- 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)
LM53635MQRNLRQ1 FAQ
1.How can I place an order for LM53635MQRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53635MQRNLRQ1 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 LM53635MQRNLRQ1 reliable?
The price and inventory of LM53635MQRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53635MQRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LM53635MQRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53635MQRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53635MQRNLRQ1?
LM53635MQRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53635MQRNLRQ1 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 LM53635MQRNLRQ1?
For technical support, including LM53635MQRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53635MQRNLRQ1 requirements.
6.How does Aetrix verify that LM53635MQRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LM53635MQRNLRQ1 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 LM53635MQRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LM53635MQRNLRQ1?
All LM53635MQRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53635MQRNLRQ1, 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 LM53635MQRNLRQ1 part is unused and in its original packaging.
Return procedure for LM53635MQRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM53635MQRNLRQ1 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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