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Texas Instruments LMR36506RS3QRPERQ1
- Part No.:
- LMR36506RS3QRPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR36506RS3QRPERQ1.pdf
- Description:
- IC REG BUCK 3.3V 600MA 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,471
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Product details
Overview
LMR36506RS3QRPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade synchronous buck converter delivering 0.6 A output at fixed 3.3 V, operating from 3.0 V to 65 V input, with 4 µA quiescent current in switching PFM mode and integrated PGOOD flag - used in ADAS power rails requiring cold-crank resilience and EMI-compliant compact DC/DC conversion.
For engineers reviewing the LMR36506RS3QRPERQ1 datasheet, LMR36506RS3QRPERQ1 pinout, LMR36506RS3QRPERQ1 application, or LMR36506RS3QRPERQ1 equivalent, key selection criteria include its 2-mm × 2-mm HotRod™ VQFN-HR package, RT-pin-adjustable switching frequency (200 kHz–2.2 MHz), pseudo-random spread spectrum for CISPR 25 compliance, and 3.3 V ±1.5% output accuracy across –40°C to +125°C ambient.
Technical Context
The LMR36506RS3QRPERQ1 uses peak current mode control with internal compensation, enabling stable regulation with minimal external output capacitance. Its architecture supports seamless FPWM-to-PFM transition and automatic frequency foldback during deep input sags (e.g., 3.6 V cold-crank), maintaining regulation down to 2.45 V falling UVLO threshold.
This variant features factory-trimmed VOUT/BIAS pin for fixed 3.3 V output and unconnected MODE/SYNC pin - instead using the RT pin for frequency programming via external resistor. It lacks synchronization capability but includes spread spectrum dithering (±2% span, ~1.2 Hz pattern) and thermal shutdown with 158°C rising threshold and 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V (rising) to 65 V - supports automotive battery transients up to 70 V and cold-crank operation below 4 V. |
| Output Voltage | Fixed 3.3 V ±1.5% (FPWM mode) - eliminates external feedback divider and reduces BOM count. |
| Max Output Current | 0.6 A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in body electronics. |
| Quiescent Current | 4 µA at 24 VIN/3.3 VOUT in PFM - enables >80% efficiency at 1 mA load for always-on systems. |
| Switching Frequency | Adjustable 200 kHz–2.2 MHz via RT resistor - allows EMI optimization and inductor size trade-off without layout change. |
| Package | VQFN-HR (RPE), 2.0 mm × 2.0 mm, 9-pin with wettable flanks - enables automated optical inspection and robust solder joint reliability. |
| PGOOD Accuracy | ±1.8% hysteresis, 106–110% OV / 93–96.5% UV thresholds - provides precise rail monitoring without external supervisor IC. |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C TA), junction range –40°C to +150°C - qualified for under-hood and ADAS ECU deployment. |
Pinout & Package
VQFN-HR (RPE) 9-pin, 2.0 mm × 2.0 mm package with wettable flanks and corner anchor pads for enhanced solder joint reliability and AOI compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RT | Frequency programming input | Connects to GND (2.2 MHz), VCC (1 MHz), or resistor (200 kHz–2.2 MHz); not MODE/SYNC - no sync capability on this variant. |
| 2 - PGOOD | Open-drain power-good flag | Asserts high when VOUT is within ±1.8% window; requires pull-up; enables system reset sequencing without external supervisor. |
| 3 - EN/UVLO | Enable and input undervoltage lockout | Active-high enable with 0.4 V wake threshold and 1.263 V precision ON level; supports direct VIN connection or remote control. |
| 4 - VIN | Main input power supply | Accepts 3.0–65 V; requires local high-quality bypass capacitor; withstands 70 V transient surges. |
| 5 - SW | Power switch node | Connects to external inductor; carries high di/dt; must be routed with short, low-inductance trace to minimize EMI. |
| 6 - BOOT | High-side gate driver bootstrap | Requires 100 nF ceramic capacitor between BOOT and SW; critical for MOSFET gate drive integrity. |
| 7 - VCC | Internal LDO output | 3.15 V ±25 mV regulated supply for control circuitry; decouple with 1 µF capacitor to GND; not for external loads. |
| 8 - VOUT/BIAS | Fixed-output voltage sense & bias | Factory-trimmed for 3.3 V; connects directly to output node; sets reference internally - no FB divider needed. |
| 9 - GND | Power ground | Primary return path; must be connected to CIN with short, wide copper; separates analog and power ground planes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PGOOD with delayed release | Eliminates need for external reset supervisor IC in ADAS and infotainment modules, reducing component count and board area. |
| Pseudo-random spread spectrum | Reduces peak EMI by ±2% frequency dithering at ~1.2 Hz, enabling CISPR 25 Class 5 compliance without shielding or common-mode chokes. |
| Ultra-low IQ in PFM mode | 4 µA at 24 VIN/3.3 VOUT enables >80% efficiency at 1 mA load - critical for always-on vehicle networks and telematics. |
| Internal compensation | Removes requirement for external Type II/III compensation network, simplifying design and improving production yield consistency. |
| HotRod™ flip-chip packaging | Eliminates bond wires to reduce parasitic inductance, improving switching efficiency and EMI performance over traditional QFN. |
| Wide input sag tolerance | Maintains regulation down to 2.45 V input (falling UVLO), supporting engine start conditions in 12 V automotive systems. |
Applications
| ADAS Power Rail | Body Control Module |
|---|---|
Use Scenario: Powers vision processor SoC and radar sensor interface in forward collision warning system. IC Role / Device Role / Timing Role: Primary 3.3 V point-of-load regulator supplying core logic and I/O domains during cold-crank and load-dump events. Use Value: Maintains regulation at 3.6 V input during cranking; PGOOD enables safe processor boot sequencing; spread spectrum meets OEM EMI limits. |
Use Scenario: Supplies 3.3 V to door module MCU, LIN transceiver, and LED drivers in centralized body electronics. IC Role / Device Role / Timing Role: Compact, low-IQ buck converter enabling always-on wake-up functionality with <6.5 µA standby current. Use Value: 2-mm × 2-mm footprint saves PCB space; 4 µA PFM IQ extends battery life in key-off state; AEC-Q100 Grade 1 ensures field reliability. |
| Infotainment Head Unit | Digital Cluster Display |
Use Scenario: Generates 3.3 V for audio DSP, touch controller, and USB PHY in automotive infotainment head unit. IC Role / Device Role / Timing Role: Secondary buck stage after main 5 V rail; handles dynamic load steps up to 0.6 A with <2.5 ms soft-start. Use Value: Internal compensation avoids tuning delays; RT-adjustable frequency avoids AM band interference; PGOOD validates rail before firmware execution. |
Use Scenario: Provides clean 3.3 V to TFT display controller and graphics accelerator in digital instrument cluster. IC Role / Device Role / Timing Role: High-PSRR, low-noise DC/DC source with tight output accuracy (±1.5%) for display timing and pixel clock stability. Use Value: 3.3 V ±1.5% accuracy ensures consistent gamma correction; thermal shutdown (158°C) protects against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36506MSC3RPERQ1 | Same 3.3 V fixed output, but includes MODE/SYNC pin for external clock synchronization - no RT pin. | Suitable where system-level clock domain alignment is required (e.g., multi-rail synchronized converters). | Select when EMI-sensitive systems require deterministic frequency locking; LMR36506RS3QRPERQ1 is preferred for cost-sensitive, standalone designs. |
| LMR36503RS3QRPERQ1 | Pin-compatible 300 mA version (same RPE package, 3.3 V fixed), lower current rating, identical pinout and feature set. | Used in lower-power nodes like seat control or mirror modules where 0.3 A suffices. | Choose for BOM rationalization across platforms; LMR36506RS3QRPERQ1 provides headroom for future feature expansion or higher ILOAD margin. |
Compared with LMR36506MSC3RPERQ1, LMR36506RS3QRPERQ1 trades synchronization capability for lower cost and RT-based frequency flexibility; versus LMR36503RS3QRPERQ1, it doubles output current while retaining identical footprint and thermal profile - enabling scalable power design without layout revision.
Availability
LMR36506RS3QRPERQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (ADAS), body electronics and lighting, and infotainment and cluster applications requiring stable component supply, automotive qualification, and long-term lifecycle support.
Supply support for LMR36506RS3QRPERQ1 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for automotive, industrial, and consumer markets.
The LMR36506-Q1 product line delivers compact, high-efficiency synchronous buck converters optimized for automotive environments - designed to meet stringent AEC-Q100 requirements, cold-crank resilience, and CISPR 25 EMI standards.
FAQ
What is the maximum input voltage rating for the LMR36506RS3QRPERQ1?
The LMR36506RS3QRPERQ1 has an absolute maximum input voltage rating of 70 V, with recommended operating range from 3.0 V (rising) to 65 V. Its 2.45 V falling UVLO threshold ensures continued operation during severe automotive cold-crank events down to ~3.6 V nominal battery voltage.
Does the LMR36506RS3QRPERQ1 support external frequency synchronization?
No, the LMR36506RS3QRPERQ1 does not support external synchronization. It uses the RT pin for adjustable switching frequency (200 kHz–2.2 MHz) and lacks the MODE/SYNC function - that capability is reserved for the LMR36506MSC3RPERQ1 variant.
What is the output voltage accuracy of the LMR36506RS3QRPERQ1 at full temperature range?
The LMR36506RS3QRPERQ1 delivers 3.3 V output with ±1.5% accuracy in FPWM mode and ±2.5% in Auto (PFM/FPWM) mode across –40°C to +125°C ambient temperature, as specified in the System Characteristics table of the datasheet.
How is the PGOOD signal configured on the LMR36506RS3QRPERQ1?
The PGOOD pin on the LMR36506RS3QRPERQ1 is an open-drain output with 106–110% overvoltage and 93–96.5% undervoltage thresholds relative to the 3.3 V output. It requires an external pull-up resistor and asserts high only when VOUT remains within this window for >25 µs (glitch filter).
What package type and dimensions does the LMR36506RS3QRPERQ1 use?
The LMR36506RS3QRPERQ1 uses the VQFN-HR (RPE) package: 2.0 mm × 2.0 mm, 9-pin, with wettable flanks and corner anchor pads. This HotRod™ flip-chip construction eliminates bond wires, reducing parasitic inductance and improving thermal and EMI performance.
LMR36506RS3QRPERQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 9-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):
- 3V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 9-VQFN-HR (2x2)
LMR36506RS3QRPERQ1 FAQ
1.How can I place an order for LMR36506RS3QRPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36506RS3QRPERQ1 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 LMR36506RS3QRPERQ1 reliable?
The price and inventory of LMR36506RS3QRPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36506RS3QRPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR36506RS3QRPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36506RS3QRPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36506RS3QRPERQ1?
LMR36506RS3QRPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36506RS3QRPERQ1 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 LMR36506RS3QRPERQ1?
For technical support, including LMR36506RS3QRPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36506RS3QRPERQ1 requirements.
6.How does Aetrix verify that LMR36506RS3QRPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR36506RS3QRPERQ1 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 LMR36506RS3QRPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR36506RS3QRPERQ1?
All LMR36506RS3QRPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR36506RS3QRPERQ1, 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 LMR36506RS3QRPERQ1 part is unused and in its original packaging.
Return procedure for LMR36506RS3QRPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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