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Texas Instruments LMR36502F3RPER
- Part No.:
- LMR36502F3RPER
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR36502F3RPER.pdf
- Description:
- IC REG BUCK ADJ/1V 150MA 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,352
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Product details
Overview
LMR36502F3RPER from Texas Instruments is a 3.3-V fixed-output, 150-mA synchronous buck DC/DC converter in a 2-mm × 2-mm HotRod™ VQFN-HR (RPE) package. It operates from 3.0 V (falling threshold) to 65 V input, delivers >80% peak efficiency at 1 MHz, and features FPWM light-load operation, precision EN/UVLO with 0.35-V hysteresis, and integrated PGOOD with glitch filtering - deployed in field transmitters, HVAC sensors, and portable power tools.
For engineers reviewing the LMR36502F3RPER datasheet, LMR36502F3RPER pinout, LMR36502F3RPER application, or LMR36502F3RPER equivalent, key selection criteria include its 150-mA rated current, 3.3-V fixed output accuracy (±1.5% in FPWM mode), 200 kHz–2.2 MHz adjustable switching frequency via RT pin, –40°C to +150°C junction temperature range, and 70-V input transient tolerance.
Technical Context
The LMR36502F3RPER uses peak current mode control with internal compensation, enabling stable regulation with minimal external output capacitance. Its FPWM mode ensures constant-frequency operation across all loads, eliminating audible noise and simplifying EMI filtering.
It integrates a high-side MOSFET (2.2 Ω RDS(on)) and low-side MOSFET (1 Ω RDS(on)), supports boot capacitor recharge via VBOOT-UVLO (2.3 V threshold), and implements thermal shutdown at 168°C with 10°C hysteresis. The RT pin enables precise frequency programming from 200 kHz to 2.2 MHz using a single resistor to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V (falling) to 65 V - withstands 70-V transients without damage |
| Output Voltage | Fixed 3.3 V ±1.5% (FPWM mode) - eliminates need for external feedback resistors |
| Max Output Current | 150 mA continuous - supports industrial sensors and low-power microcontrollers |
| Switching Frequency | 200 kHz to 2.2 MHz (RT-programmable) - enables optimization for size (high-f) or efficiency (low-f) |
| Quiescent Current | 4 µA at 24 V input, 0 A load (PFM) - extends battery life in always-on systems |
| Junction Temp Range | –40°C to +150°C - qualified for harsh industrial environments including motor drives and factory floors |
| Package | VQFN-HR (RPE), 9-pin, 2.0 mm × 2.0 mm - ultra-compact footprint with corner anchor pins for solder reliability |
Pinout & Package
VQFN-HR (RPE) 9-pin, 2.0 mm × 2.0 mm package with wettable flanks and corner anchor pads for enhanced manufacturability and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RT | Frequency setting input | Connect resistor to GND to set switching frequency from 200 kHz to 2.2 MHz; must not be floated |
| 2 - PGOOD | Open-drain power-good flag | Indicates regulated output with built-in 25-µs glitch filter and 1.96-ms delayed release; requires pull-up |
| 3 - EN/UVLO | Enable and precision undervoltage lockout | 0.4-V wake threshold, 1.263-V active threshold, 0.35-V hysteresis - enables remote UVLO or direct VIN tie |
| 4 - VIN | Main input supply | Accepts 3.0–65 V; requires local high-quality bypass capacitor to GND for stability and EMI suppression |
| 5 - SW | Switch node | Connects to power inductor; high dv/dt node requiring minimized trace area to reduce EMI |
| 6 - BOOT | Bootstrap supply | Connect 0.1-µF ceramic capacitor between BOOT and SW to drive high-side MOSFET gate |
| 7 - VCC | Internal LDO output | 3.15-V regulated supply for control circuitry; decouple with 1-µF capacitor to GND; no external loading |
| 8 - VOUT/FB | Output voltage sense / feedback | Configured as fixed 3.3-V output; internally connected to reference; no external divider required |
| 9 - GND | Power ground | Primary return path; connect directly to CIN with short, wide traces to minimize noise and improve thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| FPWM light-load operation | Eliminates frequency variation and associated EMI peaks during low-current operation - critical for EMC-compliant industrial designs |
| Integrated PGOOD with delay | Provides true system power status without external supervisor IC - reduces BOM count and board space |
| 70-V input transient protection | Withstands automotive load-dump and industrial surge events without external clamping - improves system robustness |
| HotRod™ package with corner anchors | Enables reliable reflow soldering and superior thermal resistance (RθJA = 85.7°C/W) in ultra-compact 4-mm² footprint |
| Internal compensation | Removes need for external compensation network - accelerates design cycle and reduces layout sensitivity |
Applications
| Factory Automation Sensors | Building HVAC Controllers |
|---|---|
Use Scenario: Powering 4–20 mA field transmitters in distributed I/O modules exposed to 48-V DC plant bus with voltage spikes. IC Role / Device Role / Timing Role: Primary step-down regulator converting 48-V bus to stable 3.3-V rail for analog front-end and microcontroller. Use Value: 70-V transient tolerance prevents latch-up during bus faults; FPWM mode ensures consistent timing for ADC sampling and DAC updates. | Use Scenario: Supplying smoke detectors and zone controllers in commercial HVAC systems with wide ambient temperature swings (–25°C to +70°C). IC Role / Device Role / Timing Role: Local 3.3-V power source for sensor interface and wireless SoC in battery-backed standby mode. Use Value: 4-µA quiescent current extends backup battery life; –40°C to +150°C rating covers full operating envelope including enclosure heating. |
| Garden Power Tools | Wireless Earbuds Charging Case |
Use Scenario: Regulating 18–24-V Li-ion pack voltage to 3.3-V for motor driver logic and BLE radio in cordless trimmers. IC Role / Device Role / Timing Role: Compact, rugged DC/DC stage placed near motor controller PCB section subject to vibration and EMI. Use Value: 2-mm × 2-mm HotRod™ package fits tight mechanical constraints; minimized switch-node ringing reduces conducted emissions into motor commutation signals. | Use Scenario: Providing clean 3.3-V rail from 5-V USB input in compact earbud charging case with space-limited PCB. IC Role / Device Role / Timing Role: Secondary regulator after linear charger IC, powering Bluetooth SoC and status LEDs. Use Value: Fixed 3.3-V output eliminates feedback resistors; 80%+ efficiency at 1 MHz reduces heat buildup in sealed plastic enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36502P3RPER | Same 150-mA rating and package, but uses PFM light-load mode instead of FPWM - higher light-load efficiency but variable frequency | Better suited for energy-harvesting or ultra-low-power sleep-mode applications where EMI is less critical | Select LMR36502P3RPER if minimizing no-load current (<6.5 µA) is prioritized over EMI predictability |
| LMR36503F3RPER | Pin-compatible 300-mA variant with identical 3.3-V fixed output, same RT/PGOOD/EN pinout, and extended thermal margin | Required when future-proofing for higher current peripherals (e.g., adding CAN transceiver or extra sensors) | Select LMR36503F3RPER if system load may exceed 150 mA or long-term reliability under sustained 125°C ambient is needed |
Compared with LMR36502P3RPER, the LMR36502F3RPER trades light-load efficiency for deterministic EMI behavior; compared with LMR36503F3RPER, it offers lower cost and thermal footprint where 150 mA suffices - making it optimal for cost-sensitive, space-constrained industrial edge nodes.
Availability
LMR36502F3RPER is available at Aetrix Electronics and suitable for factory automation sensors, building HVAC controllers, and portable power tools requiring stable component supply, long-term industrial lifecycle support, and guaranteed reel packaging (RPER suffix).
Supply support for LMR36502F3RPER 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LMR3650x product line was designed specifically for space-constrained, high-reliability industrial power rails - emphasizing ultra-small footprint, wide VIN resilience, and simplified system integration without external compensation.
FAQ
What is the maximum input voltage transient the LMR36502F3RPER can survive?
The LMR36502F3RPER is rated for input transients up to 70 V, exceeding its 65-V maximum operating input voltage. This capability allows it to withstand automotive load-dump events and industrial power-rail surges without requiring external TVS diodes - a key reliability feature confirmed in Section 7.1 Absolute Maximum Ratings of the datasheet. The LMR36502F3RPER maintains functional integrity during these transients when properly decoupled.
Does the LMR36502F3RPER require external feedback resistors for its 3.3-V output?
No, the LMR36502F3RPER features a fixed 3.3-V output configuration, meaning the VOUT/FB pin is internally connected to the 3.3-V reference - no external resistor divider is needed. This is explicitly stated in the Device Comparison Table and Pin Functions table, where VOUT/FB is described as "Fixed output options… Connect to the output voltage node for fixed VOUT." The LMR36502F3RPER simplifies layout and reduces BOM count versus adjustable variants.
What switching frequency options does the LMR36502F3RPER support, and how is it set?
The LMR36502F3RPER supports an externally programmable switching frequency from 200 kHz to 2.2 MHz using a single resistor from the RT pin to GND. Its default frequency is 1 MHz when RT is tied to VCC, and 2.2 MHz when RT is grounded - both values verified in Section 7.5 Electrical Characteristics. The LMR36502F3RPER's RT pin must never be left floating, and resistor selection must follow TI's published design equations to avoid instability.
How does the PGOOD function of the LMR36502F3RPER differ from basic power-good flags?
The LMR36502F3RPER's PGOOD pin includes a built-in 25-µs glitch filter and a 1.96-ms delayed release time, ensuring only sustained output regulation triggers the flag - eliminating false positives from startup overshoot or brief line disturbances. As specified in Section 7.5, PGOOD asserts high only after VOUT reaches 107% of nominal and remains stable, and deasserts only after falling below 94%. This eliminates need for external supervisors in most industrial applications.
Is the LMR36502F3RPER pin-compatible with other members of the LMR3650x family?
Yes, the LMR36502F3RPER shares identical pinout, package (VQFN-HR RPE), and footprint with LMR36501, LMR36503, and LMR36506 variants - confirmed in the Device Comparison Table and Pin Configuration section. This enables scalable power design: users can upgrade from 100 mA (LMR36501) to 300 mA (LMR36503) without PCB revision. However, current-limiting and thermal performance differ, so layout copper and thermal relief must be validated per variant.
LMR36502F3RPER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMR3650x
- Package/Case:
- 9-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 1V (3.3V)
- Voltage - Output (Max):
- 16V
- Current - Output:
- 150mA
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-VQFN-HR (2x2)
LMR36502F3RPER FAQ
1.How can I place an order for LMR36502F3RPER through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36502F3RPER 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 LMR36502F3RPER reliable?
The price and inventory of LMR36502F3RPER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36502F3RPER is usually 5 days.
3.What payment methods are accepted for LMR36502F3RPER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36502F3RPER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36502F3RPER?
LMR36502F3RPER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36502F3RPER 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 LMR36502F3RPER?
For technical support, including LMR36502F3RPER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36502F3RPER requirements.
6.How does Aetrix verify that LMR36502F3RPER is sourced from the original manufacturer or authorized distributors?
All LMR36502F3RPER 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 LMR36502F3RPER meets industry standards.
7.What is the process for return or replacement of LMR36502F3RPER?
All LMR36502F3RPER units undergo pre-shipment inspection (PSI). If there is an issue with LMR36502F3RPER, 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 LMR36502F3RPER part is unused and in its original packaging.
Return procedure for LMR36502F3RPER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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