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Texas Instruments LM536255QRNLTQ1
- Part No.:
- LM536255QRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM536255QRNLTQ1.pdf
- Description:
- IC REG BUCK 5V 2.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:140
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Product details
Overview
LM536255QRNLTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering a fixed 5-V output at up to 2.5 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 junction temperature, and 15-µA quiescent current in light-load mode-used in automotive head units for stable 5-V rail generation under cold-crank conditions.
For engineers reviewing the LM536255QRNLTQ1 datasheet, LM536255QRNLTQ1 pinout, LM536255QRNLTQ1 application, or LM536255QRNLTQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and EMI performance, and real-world selection guidance against comparable fixed-output 5-V buck regulators.
Technical Context
The LM536255QRNLTQ1 implements peak-current-mode control with adaptive frequency spreading to maintain regulation down to 300-mV dropout at 2.5 A while sustaining 2.1-MHz operation across wide VIN–VOUT ratios-including 18 V → 3.3 V conversion. Its integrated high-side/low-side MOSFETs feature 60 mΩ/40 mΩ typical RDS(on) and support seamless PWM-to-PFM transition.
It integrates a 1.0-V internal reference (±0.5% over temperature), open-drain RESET with 3-ms release timer and 12–45 µs glitch filtering, external SYNC input (1.9–2.3 MHz), and FPWM pin for forced continuous conduction mode-enabling precise system-level timing coordination and robust fault signaling in telematics power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1% (–40°C to +125°C TJ); enables direct replacement of LDOs in 5-V microcontroller/system-rail applications. |
| Max Output Current | 2.5 A continuous; supports full-power operation of automotive infotainment SoCs and CAN transceivers without derating at 105°C ambient. |
| Input Voltage Range | 3.9 V to 36 V (transient tolerant to 42 V ≤500 ms); accommodates 12-V automotive battery fluctuations including cold-crank (–40°C) and load-dump events. |
| Switching Frequency | 2.1 MHz nominal (1.85–2.35 MHz range); allows use of compact 2.2-µH inductors and avoids AM-band interference in cabin audio systems. |
| Quiescent Current | 15 µA typical at no load (3.3-V output variant); ensures <10 µW standby power draw in always-on telematics modules. |
| Thermal Performance | RθJA = 29.4°C/W (VQFN-22); sustains 2.5-A load at 105°C ambient with standard 2-layer PCB and 1-in² copper pour. |
| RESET Function | Open-drain output with 3-ms release delay and 12–45 µs internal glitch filter; eliminates need for external supervisor IC in instrument cluster boot sequencing. |
Pinout & Package
LM536255QRNLTQ1 uses a 5.0 mm × 4.0 mm VQFN-HR (22-pin) package with wettable flanks for automated optical solder-joint inspection. Thermal pad (exposed die attach) must be connected to PGND for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Internal LDO output | Supplies 3.1-V bias to control circuitry; 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 during switching cycle. |
| SYNC (Pin 3) | Frequency synchronization input | Accepts 1.9–2.3 MHz external clock rising edge; synchronizes multiple converters to reduce beat-frequency EMI. |
| PVIN1/PVIN2 (Pins 4,14) | Main power input | Dual high-current VIN pins reduce trace inductance; must be shorted together on PCB with low-impedance path to PGND. |
| SW (Pin 9) | Switch node | Connects directly to power inductor; critical for minimizing ringing-layout requires tight loop with CIN and PGND. |
| FB (Pin 21) | Feedback input | Internally tied to 5-V divider; no external resistors required-reduces BOM count and leakage error in fixed-output configuration. |
| BIAS (Pin 22) | Auxiliary bias supply | Connected to output rail; improves efficiency by powering internal circuits from regulated 5-V output instead of VIN. |
| RESET (Pin 19) | Open-drain fault flag | Asserts low on UVLO, thermal shutdown, or EN deactivation; requires external pull-up for MCU reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2500 V / CDM ±1000 V ESD robustness-meets automotive front-end module requirements. |
| Low EMI HotRod QFN packaging | Flip-chip construction with wettable flanks reduces switch-node parasitic inductance by >50%, suppressing radiated emissions per CISPR 25 Class 5. |
| Integrated soft-start and compensation | 3.2-ms internal soft-start ramp and fully compensated loop eliminate external compensation components-reducing layout sensitivity and validation time. |
| Pin-selectable forced PWM mode | FPWM pin (Pin 16) enables constant 2.1-MHz operation regardless of load-ensures predictable EMI profile in noise-sensitive radar or camera subsystems. |
| True-dropout regulation | Maintains 5-V regulation with only 300-mV VIN–VOUT differential at 2.5 A-supports operation during deep battery sag (e.g., engine start at –40°C). |
Applications
| Telematics Control Unit | Automotive Head Unit |
|---|---|
Use Scenario: Powering LTE modem, GNSS receiver, and secure element in connected vehicle gateway under 12-V battery with cold-crank dips to 3.5 V. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying core logic rails; RESET signal sequences modem initialization after power-good assertion. Use Value: 15-µA quiescent current extends battery backup runtime; 2.1-MHz switching avoids interference with cellular RF bands. |
Use Scenario: Generating clean 5-V supply for display controller, touch processor, and USB PHY in infotainment head unit with strict EMI limits. IC Role / Device Role / Timing Role: Fixed-output step-down converter with integrated BIAS connection; SYNC pin aligns switching edges with audio clock domain to suppress beat tones. Use Value: Wettable-flank VQFN enables AOI inspection without X-ray; ±1% output accuracy ensures reliable USB enumeration across temperature. |
| Instrument Cluster Display | ADAS Camera Module |
Use Scenario: Providing regulated 5-V rail to TFT-LCD driver IC and microcontroller in digital instrument cluster with 10-year field life requirement. IC Role / Device Role / Timing Role: Automotive-grade DC-DC with RESET output driving cluster MCU reset pin; thermal shutdown at 155°C prevents latch-up during prolonged sunload exposure. Use Value: RθJB = 5.4°C/W enables operation at 105°C ambient using only PCB copper; AEC-Q100 qualification satisfies ISO 26262 ASIL-B functional safety prerequisites. |
Use Scenario: Powering image sensor, ISP, and serializer in rear-view camera exposed to under-hood temperature cycling (–40°C to +105°C). IC Role / Device Role / Timing Role: High-efficiency buck converter with FPWM mode enabled; maintains constant 2.1-MHz switching to avoid modulation artifacts in video output. Use Value: 90% peak efficiency at 3.5-A load minimizes thermal rise in sealed housing; spread-spectrum option further lowers peak EMI for CISPR 25 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output 5-V buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM536355QRNLTQ1 | Same pinout and features, but rated for 3.5-A max output current and higher MOSFET current limits (IL-HS = 4.5–6 A vs. 3.5–5 A). | Suitable for higher-power head units with multi-core SoCs or additional USB peripherals requiring >2.5 A at 5 V. | Select when load current exceeds 2.5 A or future-proofing for higher-power derivatives is needed; same PCB layout. |
| TPS54560QDDARQ1 | Adjustable-output (0.8–60 V), 5-A capable, 2.5-MHz max frequency; lacks integrated RESET, spread spectrum, and BIAS pin. | Requires external feedback divider and supervisor IC; better suited for flexible multi-rail designs where 5-V is one of several outputs. | Choose when adjustable output or higher current is primary requirement and added BOM complexity is acceptable. |
Compared with LM536355QRNLTQ1, the LM536255QRNLTQ1 offers optimized cost and thermal margin for 2.5-A applications, while TPS54560QDDARQ1 trades integration for flexibility-making LM536255QRNLTQ1 the preferred choice for cost-sensitive, space-constrained 5-V-only automotive modules.
Availability
LM536255QRNLTQ1 is available at Aetrix Electronics and suitable for automotive telematics, head unit, and instrument cluster applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM536255QRNLTQ1 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 decades of automotive power management innovation and rigorous AEC-Q100 qualification infrastructure.
The LM536xx-Q1 product line delivers high-frequency, low-quiescent-current buck regulators optimized for automotive infotainment, ADAS, and body electronics-designed to replace discrete LDOs and legacy controllers while meeting stringent EMI, thermal, and reliability targets.
FAQ
What is the maximum input voltage transient rating for LM536255QRNLTQ1?
The LM536255QRNLTQ1 withstands input transients up to 42 V for ≤500 ms at ≤0.01% duty cycle, enabling robust operation during automotive load-dump events without external TVS diodes-verified per AEC-Q100 stress testing protocols.
Does LM536255QRNLTQ1 require external feedback resistors for 5-V operation?
No. The LM536255QRNLTQ1 is factory-configured for fixed 5-V output; the FB pin is internally connected to the 5-V divider, eliminating external resistors and associated tolerance/leakage errors-confirmed in TI's SNVSAA7B datasheet Section 6 and Table 5-1.
How does the RESET output of LM536255QRNLTQ1 behave during startup?
The LM536255QRNLTQ1 RESET output remains low for 3 ms after output reaches regulation, then transitions high; it asserts low again on EN deactivation, UVLO, or thermal shutdown-providing synchronized, glitch-filtered power-good signaling per Section 7.5 of the datasheet.
Can LM536255QRNLTQ1 operate with input voltage below 3.9 V?
Yes. The LM536255QRNLTQ1 supports minimum input of 3.55 V (rising) for 5-V output at full load, enabling operation during cold-crank; however, dropout voltage increases to 600 mV at 2.5 A-detailed in Section 7.3 and 7.6 of the datasheet.
Is LM536255QRNLTQ1 compatible with lead-free reflow profiles?
Yes. The LM536255QRNLTQ1 VQFN-HR package is qualified for standard JEDEC J-STD-020D lead-free reflow, with peak temperature rating of 260°C-documented in TI's packaging specification SLMA135 and orderable addendum.
LM536255QRNLTQ1 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:
- 2.5A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 22-VQFN-HR (5x4)
LM536255QRNLTQ1 FAQ
1.How can I place an order for LM536255QRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM536255QRNLTQ1 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 LM536255QRNLTQ1 reliable?
The price and inventory of LM536255QRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM536255QRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LM536255QRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM536255QRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM536255QRNLTQ1?
LM536255QRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM536255QRNLTQ1 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 LM536255QRNLTQ1?
For technical support, including LM536255QRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM536255QRNLTQ1 requirements.
6.How does Aetrix verify that LM536255QRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LM536255QRNLTQ1 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 LM536255QRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LM536255QRNLTQ1?
All LM536255QRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM536255QRNLTQ1, 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 LM536255QRNLTQ1 part is unused and in its original packaging.
Return procedure for LM536255QRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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