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Texas Instruments LM536355QRNLRQ1
- Part No.:
- LM536355QRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM536355QRNLRQ1.pdf
- Description:
- IC REG BUCK 5V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LM536355QRNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering a fixed 5-V output at up to 3.5 A, operating from 3.9 V to 36 V input with 2.1-MHz switching, ±1% output voltage tolerance (–40°C to +125°C), and 15-µA quiescent current at no load-designed for head unit power rails.
For engineers reviewing the LM536355QRNLRQ1 datasheet, LM536355QRNLRQ1 pinout, LM536355QRNLRQ1 application, or LM536355QRNLRQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and EMI performance, and real-world selection guidance for telematics and instrumentation cluster designs.
Technical Context
The LM536355QRNLRQ1 uses 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 (4.5–7.5 A high-side limit), thermal shutdown (155–175°C trip), and a filtered open-drain RESET output with 3-ms release timer and ±3% hysteresis-enabling system-level fault monitoring without external supervision ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1% over –40°C to +125°C junction temperature |
| Max Output Current | 3.5 A continuous; supports full-load operation up to +125°C ambient |
| Input Voltage Range | 3.9 V to 36 V; withstands 42-V transients ≤500 ms at 0.01% duty cycle |
| Switching Frequency | 2.1 MHz nominal; synchronized externally (1.9–2.3 MHz) or spread-spectrum enabled |
| Quiescent Current | 15 µA typical at no load (3.3-V output); 20 µA typical at no load (5-V output) |
| Dropout Voltage | 0.6 V at 3.5 A and +105°C ambient; enables stable 5-V regulation from 5.6-V input |
| RESET Function | Open-drain output with 3-ms release timer; asserts low when output falls below 94% of setpoint |
Pinout & Package
LM536355QRNLRQ1 is housed in a 5.0-mm × 4.0-mm VQFN-HR (RNL) package with 22 pins and wettable flanks for automated optical inspection. Thermal resistance: RθJA = 29.4°C/W, RθJC(bot) = 2.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal LDO output | 3.1-V supply for control circuitry; requires 4.7-µF capacitor to AGND |
| CBOOT | Bootstrap capacitor node | Connects 470-nF capacitor to SW; enables high-side MOSFET gate drive |
| SYNC | Frequency synchronization input | Rising-edge triggered; accepts 1.9–2.3 MHz external clock for EMI reduction |
| PVIN1 / PVIN2 | Main power input terminals | Dual high-current VIN paths; must be shorted on PCB with low-inductance layout |
| SW | Switch node | Connects directly to power inductor; high dv/dt node requiring tight loop area |
| PGND1 / PGND2 | Power ground terminals | Eight dedicated ground pins; must tie together and connect to AGND and system ground |
| AVIN | Analog input reference | Bias path for internal analog circuits; connects to PVIN on PCB |
| FPWM | Forced PWM mode control | High = fixed 2.1-MHz operation; low = automatic light-load diode emulation |
| EN | Enable input | Active-high logic; 1.7–2.0 V threshold; hysteresis ensures noise immunity |
| RESET | Open-drain fault indicator | Asserts low during undervoltage, overtemperature, or EN deactivation; 3-ms release delay |
| FB | Feedback input | Internally connected to 5-V divider; no external resistor required for fixed-output version |
| BIAS | Auxiliary bias input | Connected to output rail; improves efficiency and transient response via local biasing |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2500 V and CDM ±1000 V ESD robustness |
| Low-EMI HotRod QFN packaging | Flip-chip construction reduces switch-node loop inductance, suppressing radiated emissions and overshoot |
| Integrated RESET with filtering | Eliminates need for external supervisor IC; built-in 12–45 µs glitch filter and 3-ms release timer |
| Adaptive frequency spreading | Maintains 98% max duty cycle and 300-mV dropout at 3.5 A while avoiding audible noise and EMI peaks |
| Pin-selectable forced PWM mode | Enables deterministic 2.1-MHz switching under all loads-critical for EMI-sensitive infotainment systems |
| Internal compensation & soft-start | Reduces BOM count by eliminating external compensation network and startup timing components |
Applications
| Telematics Module Power | Automotive Head Unit Core Rail |
|---|---|
Use Scenario: Powers LTE modem, GNSS receiver, and CAN interface in vehicle connectivity units requiring clean, regulated 5-V supply with low standby consumption. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying core logic and RF subsystems; provides RESET signal for host MCU boot sequencing. Use Value: 15-µA quiescent current extends battery backup runtime; 42-V transient tolerance eliminates need for upstream TVS clamping. |
Use Scenario: Delivers stable 5-V rail to display controller, audio DSP, and USB hub in infotainment head units exposed to cold-crank and load-dump conditions. IC Role / Device Role / Timing Role: Main system power converter with integrated RESET flag used for safe firmware initialization and brownout recovery. Use Value: Wettable-flank VQFN enables AOI validation; 2.1-MHz switching allows compact 2.2-µH inductor and ceramic output capacitors. |
| Instrument Cluster Microcontroller Supply | ADAS Camera Interface Power |
Use Scenario: Supplies 5-V domain to microcontroller, EEPROM, and backlight driver in digital instrument clusters where space and thermal margin are constrained. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with thermal shutdown (155°C) and RESET assertion for fail-safe gauge rendering. Use Value: 0.6-V dropout at 3.5 A ensures uninterrupted operation during 6-V cold-crank; RθJC(bot) = 2.4°C/W enables direct PCB copper heatsinking. |
Use Scenario: Powers image sensor interface and serializer ICs in rear-view or surround-view camera modules requiring low-noise, ripple-immune 5-V supply. IC Role / Device Role / Timing Role: EMI-optimized buck converter with spread-spectrum mode to avoid interference with video data transmission. Use Value: Low switch-node ringing (<1.2× VIN overshoot) prevents coupling into LVDS/MIPI clock lines; SYNC input enables system-wide EMI alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM536353QRNLRQ1 | Fixed 3.3-V output; identical package, pinout, and feature set | Used where 3.3-V logic rail is required instead of 5-V; same thermal and EMI performance | Select when system architecture mandates 3.3-V core voltage and shares layout with LM536355QRNLRQ1 |
| LM536255QRNLRQ1 | 2.5-A output rating; otherwise identical electrical specs and pinout | Suitable for lower-current 5-V rails (e.g., MCU peripherals) with reduced thermal stress | Choose for cost-optimized designs where 3.5-A capability is unnecessary and board space allows same footprint |
Compared with LM536355QRNLRQ1, LM536353QRNLRQ1 offers identical performance at 3.3 V but cannot regulate 5 V, while LM536255QRNLRQ1 delivers only 2.5 A-making both alternatives viable only when output voltage or current requirements differ, not as drop-in replacements.
Availability
LM536355QRNLRQ1 is available at Aetrix Electronics and suitable for automotive telematics, head unit, and instrumentation cluster designs requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM536355QRNLRQ1 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 solutions with over 50 years of innovation in high-reliability electronics.
The LM536xx-Q1 product line delivers high-frequency, low-EMI synchronous buck regulators optimized for automotive infotainment, ADAS, and body electronics-designed to replace discrete DC-DC stages with integrated, AEC-Q100-qualified power ICs.
FAQ
What is the maximum continuous output current of the LM536355QRNLRQ1?
The LM536355QRNLRQ1 delivers up to 3.5 A continuous output current at ambient temperatures up to +105°C, with derating above that point per its thermal characteristics. At +125°C ambient, it sustains ≥2.8 A with proper PCB copper area and airflow. The device's high-side current limit is specified from 4.5 A to 7.5 A, ensuring robust overload protection without latch-off.
Does the LM536355QRNLRQ1 require external compensation components?
No, the LM536355QRNLRQ1 features fully integrated compensation, eliminating the need for external RC networks or type-II/III compensators. This simplifies design, reduces BOM count, and ensures stability across its full operating range-including with ceramic output capacitors from 22 µF to 220 µF-without requiring loop analysis or tuning.
Can the LM536355QRNLRQ1 operate during automotive cold-crank conditions?
Yes, the LM536355QRNLRQ1 supports input voltages as low as 3.55 V (typical) to maintain regulation, enabling operation during cold-crank events down to ~6 V at the battery terminal. Its minimum input voltage for full functionality at 3.5-A load is 3.9 V, and it tolerates 42-V transients for ≤500 ms-meeting ISO 7637-2 Pulse 1/2/5a requirements with minimal external protection.
What is the purpose of the BIAS pin on the LM536355QRNLRQ1?
The BIAS pin on the LM536355QRNLRQ1 connects to the output voltage rail and powers the internal bias regulator, improving light-load efficiency and transient response. When tied to the 5-V output, it reduces quiescent current and enhances regulation accuracy-especially critical for always-on telematics modules where standby power must remain below 20 µA.
Is the LM536355QRNLRQ1 pin-compatible with other devices in the LM536xx-Q1 family?
Yes, all LM536xx-Q1 variants-including LM536355QRNLRQ1, LM536353QRNLRQ1, and LM536255QRNLRQ1-share identical 22-pin VQFN-HR (RNL) packaging, pinout, and footprint. This enables single PCB design reuse across 3.3-V/5-V and 2.5-A/3.5-A variants, simplifying platform scalability and inventory management without layout changes.
LM536355QRNLRQ1 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)
LM536355QRNLRQ1 FAQ
1.How can I place an order for LM536355QRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM536355QRNLRQ1 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 LM536355QRNLRQ1 reliable?
The price and inventory of LM536355QRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM536355QRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LM536355QRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM536355QRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM536355QRNLRQ1?
LM536355QRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM536355QRNLRQ1 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 LM536355QRNLRQ1?
For technical support, including LM536355QRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM536355QRNLRQ1 requirements.
6.How does Aetrix verify that LM536355QRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LM536355QRNLRQ1 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 LM536355QRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LM536355QRNLRQ1?
All LM536355QRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM536355QRNLRQ1, 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 LM536355QRNLRQ1 part is unused and in its original packaging.
Return procedure for LM536355QRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM536355QRNLRQ1 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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