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Texas Instruments LMR36506RF3RPER
- Part No.:
- LMR36506RF3RPER
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR36506RF3RPER.pdf
- Description:
- IC REG BUCK 3.3V 600MA 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,100
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Product details
Overview
LMR36506RF3RPER from Texas Instruments is a 3.0V–65V input, 3.3V fixed-output synchronous buck converter delivering up to 0.6A, featuring 4µA no-load quiescent current, peak efficiency of 93% at 12VIN/3.3VOUT, and operation across –40°C to +150°C junction temperature. It serves as a rugged, ultra-compact DC/DC power stage in industrial field transmitters and process sensors.
For engineers reviewing the LMR36506RF3RPER datasheet, LMR36506RF3RPER pinout, LMR36506RF3RPER application, or LMR36506RF3RPER equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal performance (RθJA = 84.4°C/W), real-world efficiency curves at 1MHz FPWM mode, and two rigorously cross-checked alternative parts for fixed 3.3V industrial buck applications.
Technical Context
The LMR36506RF3RPER uses peak current mode control with internal compensation, enabling stable regulation with minimal output capacitance and eliminating external loop compensation components. Its RT pin supports programmable switching frequency from 200kHz to 2.2MHz via resistor selection, and its precision EN/UVLO threshold (1.263V typical) enables reliable start-up sequencing in high-noise environments.
It integrates a high-side MOSFET (RDS(on) = 920mΩ max) and low-side MOSFET (RDS(on) = 460mΩ max), supports input transients up to 70V, and features a glitch-filtered open-drain PGOOD flag with 1.956ms activation delay and ±1.8% hysteresis - all within a 2mm × 2mm HotRod™ QFN package with corner anchor pins for robust solder joint reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V (falling threshold) to 65V - supports wide industrial supply rails and withstands 70V transients without damage |
| Output Voltage | Fixed 3.3V ±1.5% (FPWM mode) - eliminates feedback divider, reduces BOM count and layout area |
| Max Output Current | 0.6A continuous - sufficient for powering microcontrollers, analog front-ends, and isolated interface ICs |
| IQ (No Load) | 4µA at 24VIN/3.3VOUT - enables multi-year battery life in always-on industrial sensors |
| Switching Frequency | Programmable 200kHz–2.2MHz via RT pin - allows EMI optimization and inductor size reduction |
| Thermal Performance | RθJA = 84.4°C/W (4-layer JEDEC board) - enables high-power-density designs with minimal heatsinking |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood, factory-floor, and high-ambient industrial deployments |
Pinout & Package
LMR36506RF3RPER is housed in a 2mm × 2mm, 9-pin VQFN-HR (HotRod™) package (orderable code: RPE), featuring exposed thermal pad, corner anchor pins for mechanical reliability, and optimized thermal path to PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RT | Frequency programming input | Connects to resistor-to-GND to set switching frequency from 200kHz–2.2MHz; must not be floated |
| 2 - PGOOD | Open-drain power-good flag | Signals regulated output (107% upper / 94% lower threshold); includes 25µs glitch filter and 1.956ms delayed activation |
| 3 - EN/UVLO | Enable and precision UVLO input | Starts regulation at 1.263V (typ), with 0.35V hysteresis; supports direct connection to VIN for simple enable |
| 4 - VIN | Main power input | Accepts 3.0–65V; requires local high-quality bypass capacitor; withstands 70V transient surges |
| 5 - SW | Switch node | Connects to power inductor; carries high di/dt; critical for EMI and layout integrity |
| 6 - BOOT | Bootstrap supply | Requires 100nF ceramic capacitor to SW; enables high-side FET drive; UVLO threshold 2.3V |
| 7 - VCC | Internal LDO output | 3.15V (typ) supply for control circuitry; 240mA current limit; decouple with 1µF to GND |
| 8 - VOUT/BIAS | Fixed 3.3V output / bias node | Provides regulated 3.3V output; also supplies internal bias; connects directly to output capacitor |
| 9 - GND | Power ground | Common return for VIN, SW, and VOUT; must connect to CIN with short, wide traces for low impedance |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 4µA at 24VIN/3.3VOUT enables energy harvesting and battery-backed operation in field sensors |
| 70V Input Transient Tolerance | Withstands IEC 61000-4-5 surge events without external clamping, reducing protection component count |
| Internal Compensation | Eliminates external Type-II/III compensation network, shrinking solution size and simplifying design validation |
| PGOOD with Delayed Release | Built-in 1.956ms activation delay and glitch filtering removes need for external supervisor IC in most systems |
| HotRod™ QFN Package | 2mm × 2mm footprint with corner anchors improves solder joint reliability and thermal transfer vs standard QFN |
Applications
| Factory Automation | Building Automation |
|---|---|
Use Scenario: Powering 4–20mA field transmitters in hazardous process environments with wide ambient temperature swings and electrical noise. IC Role / Device Role / Timing Role: Primary 3.3V DC/DC regulator supplying MCU, ADC, and isolation barrier; operates continuously at –40°C to +85°C ambient. Use Value: 4µA IQ extends loop-powered transmitter runtime; 70V transient tolerance prevents shutdown during motor switching events. |
Use Scenario: Supplying HVAC controllers and fire alarm sensor nodes mounted in ductwork or ceiling cavities with limited airflow. IC Role / Device Role / Timing Role: Compact 3.3V power source for ARM Cortex-M microcontrollers and analog signal chains; handles 65V brownout conditions. Use Value: 150°C max junction rating ensures long-term reliability at elevated ambient temperatures; 2mm × 2mm package fits tight board spaces. |
| Industrial IoT Sensors | Garden & Power Tools |
Use Scenario: Battery-operated wireless vibration sensors on rotating machinery requiring multi-year operational life. IC Role / Device Role / Timing Role: Always-on buck converter stepping down from LiFePO4 stack (up to 36V) to 3.3V for BLE SoC and MEMS accelerometer. Use Value: 4µA no-load current minimizes standby drain; FPWM mode ensures consistent timing for periodic wake-up sampling. |
Use Scenario: Powering motor control logic and battery fuel gauges in cordless drills and robotic mowers with 18–60V battery packs. IC Role / Device Role / Timing Role: Main 3.3V rail generator for MCU, gate drivers, and CAN transceivers; survives load dump transients. Use Value: 70V input rating protects against battery disconnect spikes; PGOOD flag synchronizes system reset with stable 3.3V rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36506R3RPER | Same 3.3V fixed output, but defaults to PFM light-load mode (vs FPWM in LMR36506RF3RPER); identical pinout and package | Lower IQ in PFM (4µA same), but higher light-load ripple; less suitable for timing-critical systems needing constant-frequency operation | Select LMR36506R3RPER only when ultra-low ripple is secondary to absolute minimum IQ across full load range |
| LMR33630ADJRPR | 36V-input, 3A, 3.3V fixed output; larger 3mm × 2mm WSON package; 17µA IQ; no RT pin; different pinout | Higher current capacity and better thermal margin, but larger footprint and no frequency adjustability; lacks 70V transient rating | Choose LMR33630ADJRPR only when >0.6A load or enhanced thermal headroom is required, and board space permits larger package |
Compared with LMR36506R3RPER, LMR36506RF3RPER provides deterministic FPWM operation for timing-sensitive loads, while LMR33630ADJRPR trades transient robustness and footprint for higher current and simpler frequency setup - making LMR36506RF3RPER optimal for space-constrained, high-reliability 0.6A industrial rails.
Availability
LMR36506RF3RPER is available at Aetrix Electronics and suitable for factory automation, building automation, and cordless power tool applications requiring stable component supply, long-lifecycle assurance, and guaranteed traceable sourcing.
Supply support for LMR36506RF3RPER 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 focused on analog, embedded processing, and power management technologies, serving industrial, automotive, and communications markets with high-reliability silicon solutions.
The LMR36506RF3RPER belongs to TI's LMR365xx family of ultra-small, high-voltage buck converters designed specifically for rugged industrial power rails where small size, wide input range, and low quiescent current are mandatory.
FAQ
What is the guaranteed output voltage accuracy of LMR36506RF3RPER?
The LMR36506RF3RPER guarantees ±1.5% output voltage accuracy over full load (0–0.6A), input voltage (3.6–65V), and temperature (–40°C to +150°C) in FPWM mode. This is achieved via factory-trimmed internal reference (VREF = 1.0V ±1%) and fixed 3.3V feedback network, eliminating external resistor tolerance errors. The LMR36506RF3RPER maintains this accuracy without requiring calibration or external trimming components.
Does LMR36506RF3RPER support external synchronization?
No, the LMR36506RF3RPER does not support external clock synchronization. It features an internally generated oscillator with frequency programmability via the RT pin (200kHz–2.2MHz), but lacks a MODE/SYNC pin or dedicated sync input. Synchronization capability is reserved for other variants in the LMR365xx family, such as the LMR36506RFRPER with adjustable output, which also omits SYNC functionality - confirming that no variant in this family offers external sync.
What is the maximum allowable input voltage transient for LMR36506RF3RPER?
The LMR36506RF3RPER is rated for input voltage transients up to 70V, exceeding its 65V maximum operating input. This rating is validated per absolute maximum ratings (VIN to GND = –0.3V to 70V) and explicitly stated in the device description for surge immunity compliance with IEC 61000-4-5. Operation above 65V is permitted only for transient events - sustained voltage must remain ≤65V to ensure reliability and lifetime.
Can LMR36506RF3RPER operate with zero load current?
Yes, the LMR36506RF3RPER is fully functional at zero load current, drawing only 4µA from VIN at 24V input and 3.3V output in FPWM mode. Its peak current mode architecture and internal compensation maintain regulation stability even with no output capacitance beyond the minimum recommended 22µF ceramic, and it sustains PGOOD assertion and soft-start behavior identically across the full 0–0.6A load range.
Is thermal shutdown protection included in LMR36506RF3RPER?
Yes, the LMR36506RF3RPER integrates thermal shutdown with a rising threshold of 168°C (typical) and hysteresis of 10°C (typical), ensuring safe recovery at 158°C. This protection is independent of load or input conditions and activates before permanent damage occurs. The device resumes normal operation automatically after junction temperature falls below the hysteresis threshold - a feature confirmed in Section 6.8 of the LMR36506RF3RPER datasheet.
LMR36506RF3RPER 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 9-VQFN-HR (2x2)
LMR36506RF3RPER FAQ
1.How can I place an order for LMR36506RF3RPER through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36506RF3RPER 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 LMR36506RF3RPER reliable?
The price and inventory of LMR36506RF3RPER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36506RF3RPER is usually 5 days.
3.What payment methods are accepted for LMR36506RF3RPER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36506RF3RPER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36506RF3RPER?
LMR36506RF3RPER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36506RF3RPER 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 LMR36506RF3RPER?
For technical support, including LMR36506RF3RPER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36506RF3RPER requirements.
6.How does Aetrix verify that LMR36506RF3RPER is sourced from the original manufacturer or authorized distributors?
All LMR36506RF3RPER 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 LMR36506RF3RPER meets industry standards.
7.What is the process for return or replacement of LMR36506RF3RPER?
All LMR36506RF3RPER units undergo pre-shipment inspection (PSI). If there is an issue with LMR36506RF3RPER, 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 LMR36506RF3RPER part is unused and in its original packaging.
Return procedure for LMR36506RF3RPER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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