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Texas Instruments LM536353QRNLTQ1
- Part No.:
- LM536353QRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM536353QRNLTQ1.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
LM536353QRNLTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering 3.3 V at up to 3.5 A, operating from 3.9 V to 36 V input with 2.1-MHz fixed switching frequency and ±1% output voltage tolerance over –40°C to +125°C junction temperature. It integrates high-side/low-side MOSFETs, internal compensation, soft-start, and a true open-drain RESET output with 3-ms release timer - optimized for head unit power rails.
For engineers reviewing the LM536353QRNLTQ1 datasheet, LM536353QRNLTQ1 pinout, LM536353QRNLTQ1 application, or LM536353QRNLTQ1 equivalent, key selection criteria include its 3.5-A continuous output capability, wettable-flank VQFN-22 package for automotive solder-joint inspection, spread-spectrum EMI reduction, external SYNC input (1.9–2.3 MHz), and 15-µA no-load quiescent current in light-load mode.
Technical Context
The LM536353QRNLTQ1 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 → 3.3 V conversion without frequency foldback. Its flip-chip HotRod QFN architecture minimizes parasitic inductance, reducing switch-node ringing and radiated EMI.
It features dual ground domains (AGND for analog reference, PGND1/PGND2 for high-current return paths), integrated 3.1-V VCC LDO, BIAS pin for auxiliary biasing, and FPWM pin for forced PWM mode override. The RESET output includes built-in glitch filtering (12–45 µs) and hysteresis (±1% of VOUT), eliminating need for external supervision circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1% over –40°C to +125°C TJ - ensures stable MCU/SOC core rail without external feedback divider. |
| Max Output Current | 3.5 A continuous - supports high-power infotainment processors and display drivers in automotive head units. |
| Input Voltage Range | 3.9 V to 36 V (transient tolerant to 42 V/500 ms) - accommodates cold-crank (≥4.5 V), load-dump (≤42 V), and 24-V truck systems. |
| Switching Frequency | 2.1 MHz nominal (1.85–2.35 MHz range) - enables use of compact 1–2.2 µH inductors and avoids AM-band interference. |
| Quiescent Current | 15 µA typical at no load (3.3-V output) - extends battery life in always-on telematics modules during vehicle sleep mode. |
| Package | VQFN-HR-22 (5.0 mm × 4.0 mm, 0.6-mm pitch, wettable flanks) - supports automated optical solder-joint inspection per AEC-Q200. |
| RESET Function | Open-drain output with 3-ms release timer, 105%/94% VOUT thresholds, and 12–45 µs glitch filter - provides reliable system power-good signaling without external RC network. |
Pinout & Package
VQFN-HR-22 package (5.0 mm × 4.0 mm, 0.6-mm pitch) with wettable flanks for solder-joint inspection; thermal pad exposed on bottom for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Internal LDO output | Supplies 3.1 V to internal control circuits; requires 4.7-µF ceramic capacitor to AGND for stability. |
| CBOOT (Pin 2) | Bootstrap capacitor node | Connects 470-nF capacitor to SW; enables high-side gate drive above VIN - critical for duty cycle >50%. |
| SYNC (Pin 3) | External clock input | Accepts 1.9–2.3 MHz system clock (rising-edge triggered); synchronizes switching to reduce beat frequencies in multi-rail systems. |
| PVIN1/PVIN2 (Pins 4,14) | Main power input | Dual high-current VIN pins - must be shorted on PCB to minimize loop inductance and improve transient response. |
| SW (Pin 9) | Switch node | Connects directly to power inductor; high di/dt node requiring tight layout and minimal trace length to reduce EMI. |
| PGND1/PGND2 (Pins 5–8,10–13) | Power ground returns | Eight dedicated low-impedance ground pins - must be tied together and connected to AGND near device for optimal thermal and EMI performance. |
| FB (Pin 21) | Feedback input | Internally connected to 3.3-V reference for fixed-output version; no external resistor divider required. |
| RESET (Pin 19) | Open-drain status flag | Asserts low during EN=low, UVLO, or thermal shutdown; requires external pull-up for logic-level compatibility. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2.5 kV / CDM ±1 kV - meets automotive electronics reliability requirements. |
| Integrated spread spectrum | ±3% frequency modulation centered at 2.1 MHz - reduces peak EMI by >10 dB without external components or layout changes. |
| Low dropout operation | Maintains regulation with only 300-mV VIN–VOUT differential at 3.5 A - enables stable 3.3-V output during cold-crank (VIN ≥ 3.6 V). |
| Pin-selectable forced PWM | FPWM pin (Pin 16) overrides light-load diode emulation - ensures constant 2.1-MHz switching for noise-sensitive audio or radar subsystems. |
| Built-in protection suite | Includes thermal shutdown (155–175°C), hiccup-mode short-circuit protection (6-ms wait time), input UVLO (3.25–3.55 V), and overcurrent limiting (4.5–7.5 A HS/LS). |
Applications
| Telematics Control Unit | Automotive Head Unit |
|---|---|
Use Scenario: Powering LTE modem, GNSS receiver, and CAN gateway in always-on vehicle connectivity module. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying processor I/O, memory, and RF front-end bias rails. Use Value: 15-µA quiescent current extends battery hold-up time during ignition-off; 42-V transient tolerance eliminates need for upstream TVS clamping. |
Use Scenario: Delivering clean 3.3-V supply to application processor, display interface, and audio codec in infotainment system. IC Role / Device Role / Timing Role: Main DC-DC converter for digital subsystem, synchronized via SYNC pin to avoid beat frequencies with display timing clocks. Use Value: Spread-spectrum EMI reduction meets CISPR-25 Class 5 limits; wettable-flank package enables AOI-based solder-joint verification for zero-defect manufacturing. |
| Instrument Cluster Display | ADAS Camera Power Module |
Use Scenario: Providing regulated 3.3-V rail to microcontroller, TFT LCD controller, and backlight driver in digital instrument panel. IC Role / Device Role / Timing Role: High-efficiency buck converter with RESET output used as power-good signal for MCU boot sequencing. Use Value: Integrated 3-ms RESET release timer replaces discrete RC delay network; ±1% output accuracy ensures consistent display brightness and timing margin. |
Use Scenario: Powering image sensor, ISP, and serializer in rear-view or surround-view camera ECU. IC Role / Device Role / Timing Role: Compact 2.1-MHz buck stage minimizing solution size while meeting strict EMI limits near sensitive analog video paths. Use Value: Flip-chip HotRod packaging reduces switch-node ringing - critical for maintaining SNR in high-resolution camera analog signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM536253QRNLTQ1 | 2.5-A rated output, identical pinout and feature set - lower current limit and reduced thermal margin at full load. | Suitable for lower-power instrumentation clusters or body control modules where peak load < 2.5 A. | Select when system load profile stays below 2.5 A and cost optimization is prioritized over headroom. |
| TPS54335AQDDARQ1 | 3-A output, 2.2-MHz switching, but no spread spectrum, no wettable flanks, and higher 26-µA IQ - lacks automotive-specific EMI and inspection features. | Applicable in non-critical interior modules where CISPR-25 compliance is relaxed and X-ray inspection is acceptable. | Choose only if footprint compatibility is secondary and board-level EMI filtering can be added externally. |
Compared with LM536253QRNLTQ1, the LM536353QRNLTQ1 delivers 40% higher output current with identical package and pinout - enabling direct upgrade in thermally constrained layouts. Versus TPS54335AQDDARQ1, it offers superior EMI performance, lower quiescent current, and manufacturability advantages via wettable flanks - critical for high-volume automotive production.
Availability
LM536353QRNLTQ1 is available at Aetrix Electronics and suitable for automotive telematics, head unit, and instrument cluster designs requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for LM536353QRNLTQ1 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-compliant design.
The LM536xx-Q1 product line delivers high-efficiency, low-EMI DC-DC converters specifically engineered for automotive infotainment, ADAS, and body electronics - emphasizing AEC-Q100 reliability, thermal robustness, and manufacturability in Tier 1 production environments.
FAQ
What is the maximum continuous output current of the LM536353QRNLTQ1?
The LM536353QRNLTQ1 delivers up to 3.5 A continuous output current at 3.3 V with proper PCB thermal design and ambient temperature ≤ 85°C. At 105°C ambient, derating applies per thermal metrics - RθJA = 29.4°C/W - requiring adequate copper area and airflow to sustain full load.
Does the LM536353QRNLTQ1 require external compensation components?
No, the LM536353QRNLTQ1 includes fully integrated compensation circuitry. For the fixed 3.3-V version, no external feedback resistors or compensation network is needed - simplifying design and reducing bill-of-materials cost compared to adjustable regulators.
Can the LM536353QRNLTQ1 operate during automotive cold-crank conditions?
Yes, the LM536353QRNLTQ1 supports input voltages as low as 3.55 V (typical) to maintain regulation - enabling operation during cold-crank events where battery voltage dips to ~6 V. Its 300-mV dropout at 3.5 A ensures stable 3.3-V output even under worst-case VIN conditions.
What is the purpose of the BIAS pin on the LM536353QRNLTQ1?
The BIAS pin supplies auxiliary bias to the internal control circuitry using the regulated output voltage - improving efficiency and reducing power loss versus drawing bias from VIN. For the 3.3-V version, connect BIAS directly to the output node to enable optimal light-load performance and lowest quiescent current.
Is the LM536353QRNLTQ1 pin-compatible with other devices in the LM536xx-Q1 family?
Yes, all LM53625/35-Q1 variants share identical VQFN-HR-22 pinout and footprint - including LM536253QRNLTQ1 (2.5-A), LM536355QRNLTQ1 (5-V), and spread-spectrum versions. This allows drop-in replacement for current or voltage scaling without PCB redesign.
LM536353QRNLTQ1 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)
LM536353QRNLTQ1 FAQ
1.How can I place an order for LM536353QRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM536353QRNLTQ1 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 LM536353QRNLTQ1 reliable?
The price and inventory of LM536353QRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM536353QRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LM536353QRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM536353QRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM536353QRNLTQ1?
LM536353QRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM536353QRNLTQ1 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 LM536353QRNLTQ1?
For technical support, including LM536353QRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM536353QRNLTQ1 requirements.
6.How does Aetrix verify that LM536353QRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LM536353QRNLTQ1 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 LM536353QRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LM536353QRNLTQ1?
All LM536353QRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM536353QRNLTQ1, 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 LM536353QRNLTQ1 part is unused and in its original packaging.
Return procedure for LM536353QRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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