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Texas Instruments LM536353QRNLRQ1
- Part No.:
- LM536353QRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM536353QRNLRQ1.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,367
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Product details
Overview
LM536353QRNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering a fixed 3.3-V output at up to 3.5 A, operating from 3.9 V to 36 V input with 2.1-MHz switching frequency, ±1% output voltage tolerance over –40°C to +125°C, and integrated RESET with 3-ms release timer - used in automotive head units for stable 3.3-V rail generation under cold-crank conditions.
For engineers reviewing the LM536353QRNLRQ1 datasheet, LM536353QRNLRQ1 pinout, LM536353QRNLRQ1 application, or LM536353QRNLRQ1 equivalent, key selection criteria include its 3.5-A continuous output capability, wettable-flank VQFN package for automated optical inspection, spread-spectrum EMI reduction, external frequency synchronization support, and automotive-grade thermal robustness up to +150°C junction temperature.
Technical Context
The LM536353QRNLRQ1 implements peak current-mode control with adaptive frequency spreading to maintain regulation down to 300-mV dropout at 3.5 A, enabling operation from as low as 3.55 V input to 3.3 V output. Its flip-chip HotRod QFN architecture minimizes parasitic inductance, reducing switch-node ringing and radiated EMI.
It integrates internal compensation, soft-start (3.2 ms), thermal shutdown (155°C trip), and a true open-drain RESET output with built-in 25-µs glitch filter and 3-ms valid delay - eliminating need for external supervisory ICs in telematics and instrumentation cluster designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V, ±1% tolerance over –40°C to +125°C TJ - ensures reliable logic-level supply for automotive microcontrollers and interfaces. |
| Max Output Current | 3.5 A continuous - supports high-current digital loads such as infotainment SoCs and display controllers. |
| Input Voltage Range | 3.9 V to 36 V, with 42-V transient tolerance ≤500 ms - accommodates automotive battery variations including cold-crank and load-dump events. |
| Switching Frequency | 2.1 MHz nominal, adjustable via SYNC pin (1.9–2.3 MHz) - enables compact magnetics and avoids AM-band interference. |
| Quiescent Current | 15 µA typical at no load (3.3-V output) - extends battery life in always-on vehicle modules. |
| Package | VQFN-HR (22-pin), 5.0 mm × 4.0 mm with wettable flanks - supports automated optical solder-joint inspection without X-ray. |
| RESET Output | Open-drain, 3-ms release timer, 105–110% upper / 92–96.5% lower threshold - provides accurate power-good signaling for system sequencing. |
Pinout & Package
VQFN-HR (22-pin) package with 5.0 mm × 4.0 mm body size, 0.6-mm pin pitch, and wettable flanks for solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal LDO output (3.1 V) | 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 rising-edge-triggered sync signal for system-level frequency coordination. |
| PVIN1 / PVIN2 | Main power inputs | Dual high-current VIN pins - must be shorted on PCB to minimize loop inductance and improve EMI. |
| SW | Switch node | Connects directly to power inductor; critical for minimizing switching losses and EMI radiation. |
| PGND1 / PGND2 | Power ground terminals | Eight dedicated low-side MOSFET ground pins - must be tied together and connected to AGND for thermal and noise performance. |
| FB | Feedback input | Monitors regulated 3.3-V output directly (no divider needed); 20-nA input bias enables high-resistance sensing. |
| EN | Enable control | Active-high logic input (1.7–2.0 V threshold); hysteresis prevents chatter during marginal supply conditions. |
| RESET | Open-drain status flag | Asserts low when EN = low or output drops below 92–96.5% of 3.3 V; 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. |
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 - meets automotive reliability requirements. |
| Integrated RESET with filtering | On-chip 25-µs glitch filter and 3-ms release timer eliminates external supervisor IC, saving board space and BOM cost in head unit designs. |
| Wettable-flank VQFN package | Enables AOI-based solder-joint verification without X-ray - improves manufacturing yield and field-reliability traceability in automotive production. |
| Spread-spectrum modulation | ±3% frequency dithering reduces peak EMI by >10 dB at fundamental switching frequency - simplifies EMC compliance for telematics modules. |
| Low dropout operation | Maintains regulation with only 300-mV VIN–VOUT differential at 3.5 A - supports start-stop systems where battery dips to ~6 V while powering 3.3-V loads. |
Applications
| Telematics Control Unit | Automotive Head Unit |
|---|---|
|
Use Scenario: Powering LTE/Wi-Fi modems, GNSS receivers, and secure boot processors in connected car gateways. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying core logic rails with tight voltage accuracy and fast transient response. Use Value: 15-µA quiescent current extends battery backup runtime during ignition-off; 42-V transient tolerance withstands ISO 7637-2 pulse 5a. |
Use Scenario: Generating clean 3.3-V supply for audio DSPs, touch controllers, and display interface ICs in infotainment systems. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with integrated RESET for safe system power sequencing. Use Value: Spread-spectrum EMI reduction avoids interference with AM/FM radio reception; wettable flanks ensure solder-joint reliability in high-vibration environments. |
| Instrument Cluster Display | Battery-Powered ADAS Camera Module |
|
Use Scenario: Providing regulated 3.3-V rail for microcontroller, CAN transceivers, and TFT-LCD timing controllers in digital dashboards. IC Role / Device Role / Timing Role: Automotive-grade DC-DC with precise 3.3-V output and RESET assertion for fail-safe display initialization. Use Value: ±1% output tolerance ensures consistent ADC reference and I²C bus timing; thermal shutdown at 155°C protects against overheating in sealed enclosures. |
Use Scenario: Powering image sensor, ISP, and MIPI serializer in rear-view or surround-view cameras with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise, high-frequency buck converter minimizing conducted emissions into sensitive analog video paths. Use Value: 2.1-MHz operation allows use of small 1.0-µH inductors; low EMI design reduces need for ferrite beads and shielding cans. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM536253QRNLRQ1 | 2.5-A max output, identical pinout and features - lower current rating but same 3.3-V fixed output and package. | Suitable for lower-power clusters or gateway MCUs where 3.5-A headroom is unnecessary. | Select when load current stays below 2.5 A to reduce cost and thermal margin requirements. |
| TPS54335AQDDARQ1 | 3-A output, 2.2-MHz switching, no spread spectrum, different pinout (14-pin SOIC), higher IQ (25 µA). | Lacks wettable flanks and integrated RESET; requires external supervision and larger layout area. | Choose only if legacy SOIC footprint compatibility is mandatory and EMI constraints are less stringent. |
Compared with LM536253QRNLRQ1 and TPS54335AQDDARQ1, the LM536353QRNLRQ1 delivers higher current capacity in the same compact VQFN package, includes automotive-optimized EMI suppression and system-level RESET functionality, and achieves superior light-load efficiency - making it the preferred choice for next-generation 3.3-V automotive power rails demanding integration, reliability, and regulatory compliance.
Availability
LM536353QRNLRQ1 is available at Aetrix Electronics and suitable for automotive telematics, head unit, and instrumentation cluster applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM536353QRNLRQ1 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 ICs and functional-safety-ready solutions.
The LM536xx-Q1 product line is designed specifically for automotive power conversion - delivering high-efficiency, low-EMI, AEC-Q100-qualified DC-DC regulators optimized for head units, telematics, and ADAS subsystems operating across harsh vehicle environments.
FAQ
What is the maximum continuous output current of the LM536353QRNLRQ1?
The LM536353QRNLRQ1 delivers up to 3.5 A continuous output current at 3.3 V with proper PCB layout and thermal management. This rating is validated across –40°C to +125°C ambient temperature and accounts for internal MOSFET RDS(on) and thermal derating per the datasheet's RθJA = 29.4°C/W specification. The LM536353QRNLRQ1 maintains this current capability even under 42-V transient input conditions.
Does the LM536353QRNLRQ1 require external compensation components?
No, the LM536353QRNLRQ1 features fully integrated compensation - no external RC network is required for stable operation. Its internal Type-II compensator is optimized for standard 3.3-V output configurations using recommended output capacitors (e.g., 22-µF ceramic). This eliminates tuning effort and reduces BOM count, making the LM536353QRNLRQ1 suitable for rapid automotive design cycles.
How does the RESET function operate on the LM536353QRNLRQ1?
The LM536353QRNLRQ1 provides an open-drain RESET output that asserts low when EN = low or when the regulated 3.3-V output falls below 92–96.5% of nominal. It includes a built-in 25-µs glitch filter and a 3-ms release timer after fault clearance. The LM536353QRNLRQ1 RESET pin requires an external pull-up resistor to a compatible voltage rail (e.g., 3.3 V or 5 V) and directly replaces discrete reset supervisors in automotive systems.
Can the LM536353QRNLRQ1 synchronize to an external clock?
Yes, the LM536353QRNLRQ1 supports external frequency synchronization via its SYNC pin, accepting a 1.9–2.3 MHz CMOS-compatible clock signal with rising-edge triggering. This allows precise alignment of switching edges across multiple converters in complex automotive ECUs - reducing beat frequencies and simplifying EMI filter design. The LM536353QRNLRQ1 maintains regulation and protection functions during sync operation.
What is the minimum input voltage required for the LM536353QRNLRQ1 to regulate 3.3 V at full load?
The LM536353QRNLRQ1 requires a minimum input voltage of 3.9 V to maintain full 3.5-A output current and ±2/–3% regulation accuracy at 3.3 V. However, it can sustain regulation down to 3.55 V input at reduced load (1.5 A), and as low as 3.2 V during startup (with hysteresis). This extended low-input capability supports automotive cold-crank scenarios where battery voltage dips transiently below 6 V.
LM536353QRNLRQ1 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)
LM536353QRNLRQ1 FAQ
1.How can I place an order for LM536353QRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM536353QRNLRQ1 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 LM536353QRNLRQ1 reliable?
The price and inventory of LM536353QRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM536353QRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LM536353QRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM536353QRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM536353QRNLRQ1?
LM536353QRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM536353QRNLRQ1 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 LM536353QRNLRQ1?
For technical support, including LM536353QRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM536353QRNLRQ1 requirements.
6.How does Aetrix verify that LM536353QRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LM536353QRNLRQ1 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 LM536353QRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LM536353QRNLRQ1?
All LM536353QRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM536353QRNLRQ1, 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 LM536353QRNLRQ1 part is unused and in its original packaging.
Return procedure for LM536353QRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM536353QRNLRQ1 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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