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Texas Instruments LM536255QRNLRQ1
- Part No.:
- LM536255QRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM536255QRNLRQ1.pdf
- Description:
- IC REG BUCK 5V 2.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,576
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Product details
Overview
LM536255QRNLRQ1 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 load, operating from 3.9 V to 36 V input with 2.1-MHz switching frequency, ±1% output voltage tolerance (–40°C to +125°C), and 15-µA quiescent current - used in automotive head units for stable 5-V rail generation under cold-crank conditions.
For engineers reviewing the LM536255QRNLRQ1 datasheet, LM536255QRNLRQ1 pinout, LM536255QRNLRQ1 application, or LM536255QRNLRQ1 equivalent, key selection criteria include its 5-V fixed output, wettable-flank VQFN-22 package, AEC-Q100 qualification, 2.1-MHz constant-frequency operation, and integrated RESET with 3-ms release timer - all critical for automotive power supply design validation.
Technical Context
The LM536255QRNLRQ1 implements peak-current-mode control with adaptive frequency spreading to maintain regulation down to 300-mV dropout at 3.5 A, enabling stable 5-V output even during low-input transients (e.g., 5.6-V battery start). Its flip-chip HotRod QFN architecture minimizes parasitic inductance, reducing switch-node ringing and EMI without external snubbers.
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 filtering and 3-ms valid-high delay - eliminating need for external supervisory ICs in telematics and instrumentation cluster designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1% over –40°C to +125°C junction temperature - ensures compliance with automotive MCU and interface IC supply requirements. |
| Max Output Current | 2.5 A continuous - supports dual USB ports or multi-rail LDOs in head unit applications. |
| Input Voltage Range | 3.9 V to 36 V, with 42-V/500-ms transient tolerance - handles cold-crank (≥4.5 V) and load-dump (≤42 V) per ISO 7637-2. |
| Switching Frequency | 2.1 MHz nominal, ±3% spread-spectrum option - places fundamental and harmonics above AM band (1.8 MHz), reducing EMI filter size and cost. |
| Quiescent Current | 15 µA typical at no load (3.3-V output variant); 20 µA typical for 5-V output - enables always-on functionality in battery-powered modules. |
| Package | VQFN-HR-22 (5.0 mm × 4.0 mm) with wettable flanks - supports automated optical inspection (AOI) and high-reliability solder joint verification in automotive PCB assembly. |
| RESET Output | Open-drain with 3-ms release timer and 12–45 µs internal glitch filter - provides clean, debounced system reset signal without external RC network. |
Pinout & Package
VQFN-HR-22 (5.0 mm × 4.0 mm) package with wettable flanks, 0.6-mm pin pitch, and exposed thermal pad. Designed for high-current automotive PCB layouts with low-inductance PVIN/PGND routing.
| 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; enables high-side MOSFET gate drive above VIN. |
| SYNC | External clock synchronization input | Accepts 1.9–2.3 MHz system clock (rising-edge triggered); enables EMI reduction via frequency alignment. |
| PVIN1 / PVIN2 | Main power input terminals | Dual high-current VIN pins; must be shorted on PCB to minimize loop inductance and voltage drop. |
| SW | Switch node | Connects to power inductor; high dv/dt node requiring tight layout and minimal trace length. |
| PGND1 / PGND2 | Power ground terminals | Eight dedicated low-side MOSFET return paths; must be tied together and connected to AGND at single point. |
| AVIN | Analog input reference | Bias reference for internal error amplifier; connect directly to PVIN net for accurate regulation. |
| FPWM | Forced PWM mode control | High = constant 2.1-MHz switching (no diode emulation); low = automatic light-load PFM mode. |
| EN | Enable input | Active-high logic; internal 0.4-V wake-up threshold allows direct connection to microcontroller GPIO. |
| RESET | Open-drain fault indicator | Asserts low during UVLO, thermal shutdown, or EN deactivation; requires external pull-up resistor. |
| FB | Feedback input | Internally connected to 5-V divider; not user-accessible for fixed-output variant LM536255QRNLRQ1. |
| BIAS | Auxiliary bias regulator input | Connected to output rail to improve efficiency and reduce quiescent current at light loads. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation and HBM ±2.5 kV / CDM ±1 kV ESD robustness - meets automotive electronics reliability standards. |
| Integrated RESET with timing control | 3-ms release delay and 25-µs internal glitch filter eliminate need for external supervisor IC and discrete RC timing components. |
| Wettable-flank VQFN package | Enables AOI-compatible solder joint inspection without X-ray, improving manufacturing yield and field-reliability assurance in automotive production. |
| Low EMI HotRod architecture | Flip-chip construction and optimized pin layout reduce switch-node ringing by >50% vs. standard QFN - simplifies CISPR 25 Class 5 compliance. |
| Spread-spectrum option | ±3% frequency modulation lowers peak EMI amplitude by 10 dB, easing filtering requirements in space-constrained head unit designs. |
Applications
| Telematics Control Unit | Automotive Head Unit |
|---|---|
Use Scenario: Powering LTE modem, GNSS receiver, and CAN transceivers in vehicle connectivity modules with 12-V battery input and cold-crank survival requirement. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying core logic and communication ICs; maintains regulation during 5.6-V battery dips. Use Value: 15-µA quiescent current extends battery backup runtime; 42-V transient tolerance eliminates need for upstream TVS clamping. |
Use Scenario: Generating stable 5-V rail for infotainment SoC, display interface, and audio codecs in dashboard-mounted multimedia systems. IC Role / Device Role / Timing Role: Main system power stage with integrated RESET signaling safe boot sequence to application processor. Use Value: 2.1-MHz switching enables use of 1-µH inductors and 22-µF ceramic output caps - reducing board area by 35% vs. 500-kHz solutions. |
| Instrument Cluster Display | ADAS Camera Module |
Use Scenario: Supplying 5-V power to TFT-LCD controller, backlight driver, and microcontroller in digital instrument clusters with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise, spread-spectrum-enabled buck converter minimizing radiated emissions near sensitive analog sensors. Use Value: Wettable-flank package supports IPC-A-610 Class 3 solder joint inspection - critical for safety-critical instrument cluster certification. |
Use Scenario: Providing regulated 5-V supply to image sensor, ISP, and serializer in rear-view or surround-view camera modules mounted in harsh under-hood environments. IC Role / Device Role / Timing Role: High-reliability DC-DC stage with 150°C junction rating and AEC-Q100 qualification for extended thermal life. Use Value: Built-in thermal shutdown (155°C) and 125°C-rated output accuracy prevent system failure during prolonged sun-load exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM536355QRNLRQ1 | 3.5-A rated output current; higher peak/valley current limits (4.5–7.5 A HS / 3.5–5.1 A LS); identical pinout and features. | Supports higher-power loads (e.g., multi-core SoCs, active cooling fans) where 2.5-A headroom is insufficient. | Select when system peak load exceeds 2.2 A or future-proofing for higher-current derivatives is required. |
| TPS543620RTWR | 3.5-A, 36-V input, 2.1-MHz buck with PMBus interface; no integrated RESET; requires external compensation. | Used where digital monitoring (voltage/current/temperature telemetry) and dynamic margining are needed. | Choose when telemetry, programmable sequencing, or adaptive loop compensation outweighs simplicity and RESET integration. |
Compared with LM536255QRNLRQ1, LM536355QRNLRQ1 offers higher current capability in identical footprint and qualification, while TPS543620RTWR trades integrated protection and simplicity for digital configurability - making LM536255QRNLRQ1 optimal for cost-sensitive, high-volume automotive modules needing plug-and-play 5-V regulation.
Availability
LM536255QRNLRQ1 is available at Aetrix Electronics and suitable for automotive telematics, head unit, and instrument cluster applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM536255QRNLRQ1 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 automotive qualification expertise.
The LM536xx-Q1 product line delivers high-efficiency, low-EMI, AEC-Q100-compliant DC-DC converters optimized for automotive infotainment, ADAS, and body electronics - prioritizing reliability, thermal robustness, and system-level noise reduction.
FAQ
What is the output voltage tolerance of the LM536255QRNLRQ1 over temperature?
The LM536255QRNLRQ1 maintains ±1% output voltage tolerance across the full AEC-Q100 Grade 1 junction temperature range of –40°C to +125°C. This specification is guaranteed by design and verified in production testing, ensuring consistent 5.0-V rail accuracy for automotive microcontrollers and interface ICs under thermal stress.
Does the LM536255QRNLRQ1 require external compensation components?
No, the LM536255QRNLRQ1 features fully integrated compensation circuitry. Its peak-current-mode control architecture and internal error amplifier eliminate the need for external compensation networks - reducing BOM count, PCB area, and design validation effort compared to traditional buck controllers.
Can the LM536255QRNLRQ1 operate during automotive cold-crank conditions?
Yes, the LM536255QRNLRQ1 supports minimum input voltage of 3.55 V (typical) and full functionality down to 5.6 V input at 3.5-A load. Its adaptive frequency spreading and 98% maximum duty cycle enable stable 5-V regulation even during severe cold-crank events where battery voltage drops below 6 V.
What is the purpose of the BIAS pin on the LM536255QRNLRQ1?
The BIAS pin on the LM536255QRNLRQ1 connects to the output rail to power the internal bias regulator, reducing quiescent current by up to 30% at light loads and improving overall efficiency - especially beneficial in always-on automotive modules where standby power is critical.
Is the LM536255QRNLRQ1 pin-compatible with other devices in the LM536xx-Q1 family?
Yes, all LM53625xQRNLRQ1 and LM53635xQRNLRQ1 variants share identical VQFN-HR-22 pinout and footprint. The LM536255QRNLRQ1 is mechanically and electrically compatible with LM536355QRNLRQ1, allowing drop-in current upgrade without PCB redesign - provided thermal and layout margins accommodate higher peak currents.
LM536255QRNLRQ1 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)
LM536255QRNLRQ1 FAQ
1.How can I place an order for LM536255QRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM536255QRNLRQ1 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 LM536255QRNLRQ1 reliable?
The price and inventory of LM536255QRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM536255QRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LM536255QRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM536255QRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM536255QRNLRQ1?
LM536255QRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM536255QRNLRQ1 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 LM536255QRNLRQ1?
For technical support, including LM536255QRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM536255QRNLRQ1 requirements.
6.How does Aetrix verify that LM536255QRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LM536255QRNLRQ1 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 LM536255QRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LM536255QRNLRQ1?
All LM536255QRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM536255QRNLRQ1, 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 LM536255QRNLRQ1 part is unused and in its original packaging.
Return procedure for LM536255QRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM536255QRNLRQ1 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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