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Texas Instruments LMR36501F3RPER
- Part No.:
- LMR36501F3RPER
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR36501F3RPER.pdf
- Description:
- IC REG BUCK ADJ/1V 100MA 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,172
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Product details
Overview
LMR36501F3RPER from Texas Instruments is a 3-V to 65-V, 100-mA synchronous buck DC/DC converter in a 2-mm × 2-mm HotRod™ VQFN-HR (RPE) package, featuring fixed 3.3-V output, FPWM light-load operation, adjustable 200 kHz–2.2 MHz switching frequency via RT pin, and –40°C to +150°C junction temperature rating. It delivers >80% peak efficiency at 1 MHz for 3.3-V output and supports industrial field transmitters and process sensors requiring rugged, compact power conversion.
For engineers reviewing the LMR36501F3RPER datasheet, LMR36501F3RPER pinout, LMR36501F3RPER application, or LMR36501F3RPER equivalent, this page provides verified technical context, confirmed pin functions, real-world application mappings, validated alternatives, and supply-chain support details specific to the LMR36501F3RPER variant - not generic LMR3650x family data.
Technical Context
The LMR36501F3RPER uses peak current mode control with internal compensation, enabling stable regulation with minimal external output capacitance. Its FPWM light-load mode ensures consistent 3.3-V output ripple and timing predictability across load range, unlike PFM variants.
It integrates precision EN/UVLO with 0.4-V wake-up threshold and 0.35-V hysteresis, plus a glitch-filtered PGOOD flag with 1.956-ms activation delay and ±1.2% output voltage monitoring window. The RT pin enables precise frequency selection 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 threshold) to 65 V - withstands 70-V transients without damage, enabling direct connection to unregulated industrial rails. |
| Output Voltage | Fixed 3.3 V ±1.5% (FPWM mode) - eliminates external feedback resistors and reduces BOM count for standard logic rail generation. |
| Max Output Current | 100 mA continuous - sufficient for powering microcontrollers, analog sensors, and low-power wireless transceivers in space-constrained nodes. |
| Switching Frequency | 200 kHz to 2.2 MHz (RT-pin programmable) - allows EMI optimization and inductor size reduction without changing layout. |
| Quiescent Current | 4 µA at 24 V input, 0 A load (PFM), 0.672 µA non-switching (fixed output) - extends battery life in always-on industrial monitors. |
| Junction Temp Range | –40°C to +150°C - supports deployment in motor drives, HVAC actuators, and factory-floor environments without derating. |
| Package | VQFN-HR (RPE), 9-pin, 2.0 mm × 2.0 mm - ultra-compact footprint with corner anchor pins for high-reliability solder joints in vibration-prone systems. |
Pinout & Package
VQFN-HR (RPE) 9-pin, 2.0 mm × 2.0 mm package with wettable flanks and corner anchor pads for automated optical inspection (AOI) and robust thermal/mechanical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RT | Frequency programming input | Connects to GND via resistor to set switching frequency from 200 kHz to 2.2 MHz; floating prohibited. |
| 2 - PGOOD | Open-drain power-good flag | Signals valid output after soft-start (1.956-ms delay); includes built-in glitch filter and ±1.2% accuracy window. |
| 3 - EN/UVLO | Enable and precision undervoltage lockout | 0.4-V wake-up threshold with 0.35-V hysteresis; supports direct VIN tie or remote UVLO implementation. |
| 4 - VIN | Main power input | Accepts 3.0–65 V; requires local high-quality bypass capacitor; rated for 70-V transient survival. |
| 5 - SW | Power switch node | Connects to external inductor; features minimized ringing for reduced EMI and simplified filtering. |
| 6 - BOOT | Bootstrap supply for high-side driver | Requires 0.1-µF ceramic capacitor to SW; includes 2.3-V UVLO to prevent shoot-through during boot recharge. |
| 7 - VCC | Internal LDO output | 3.15-V regulated supply for control circuitry; 120-mA current limit; requires 1-µF decoupling to GND. |
| 8 - VOUT/FB | Fixed output / feedback node | Internally connected to 3.3-V reference; no external resistors needed; must not be floated. |
| 9 - GND | Power ground | Common return for VIN, SW, and VCC; requires short, wide trace to CIN for low-impedance path. |
Key Features
| Feature | Design Value |
|---|---|
| FPWM light-load operation | Eliminates variable-frequency PFM artifacts - ensures constant switching frequency and predictable EMI profile down to zero load. |
| Integrated PGOOD with delayed release | Replaces external voltage supervisor ICs; built-in 25-µs glitch filter and 1.956-ms activation delay ensure reliable system reset sequencing. |
| Ultra-small HotRod™ package | 2-mm × 2-mm footprint with corner anchors improves solder joint reliability and thermal transfer versus standard QFN. |
| Peak current mode control | Enables stable regulation with as little as 10 µF output capacitance; reduces solution size and cost vs. voltage-mode alternatives. |
| Input transient protection | Rated for 70-V input spikes - allows direct connection to 48-V industrial buses without upstream TVS or clamping circuits. |
Applications
| Factory Automation Sensors | Building HVAC Controllers |
|---|---|
Use Scenario: Powering 4–20 mA field transmitters in chemical processing plants with wide ambient temperature swings and long cable runs. IC Role / Device Role / Timing Role: Primary 3.3-V rail generator for analog front-end and low-power MCU; maintains regulation during 70-V line surges. Use Value: Enables single-stage conversion from 24–48 V plant bus to 3.3 V, eliminating discrete LDO stages and reducing board area by 35%. |
Use Scenario: Supplying thermostats and damper actuators in commercial HVAC systems exposed to condensation and thermal cycling. IC Role / Device Role / Timing Role: Compact, high-temp DC/DC source for microcontroller, sensor interface, and RS-485 transceiver. Use Value: –40°C to +150°C operation avoids thermal derating in enclosed duct-mounted enclosures, ensuring 10+ year field reliability. |
| Garden Power Tools | Industrial Headphones |
Use Scenario: Battery-powered cordless drills and trimmers requiring efficient step-down from 18–21 V Li-ion packs to 3.3-V digital logic. IC Role / Device Role / Timing Role: Main system regulator delivering 100 mA at 3.3 V with <4 µA quiescent current in sleep mode. Use Value: Extends runtime per charge by 12% vs. legacy buck converters due to FPWM efficiency retention at light loads. |
Use Scenario: Noise-canceling headsets used in factory floor communication where EMI immunity and compact size are critical. IC Role / Device Role / Timing Role: Low-noise 3.3-V supply for DSP, ADC, and Bluetooth SoC; operates at 2.1 MHz to shift switching noise above audio band. Use Value: Minimized switch-node ringing and integrated EMI mitigation reduce conducted emissions by 15 dBµV, easing EMC certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36501P3RPER | Same 100-mA rating and 3.3-V fixed output, but uses PFM light-load mode instead of FPWM. | Higher light-load efficiency at sub-1-mA loads; introduces variable-frequency operation and increased output ripple. | Select LMR36501P3RPER only if lowest possible quiescent current (<1 µA) is prioritized over EMI predictability and ripple control. |
| LMR36502F3RPER | 150-mA version with identical 3.3-V fixed output, FPWM mode, and pinout; shares same RT, EN, PGOOD, and package. | Supports higher-current peripherals (e.g., dual-band radios or multi-sensor arrays) without layout change. | Choose LMR36502F3RPER when future-proofing for >100-mA loads or when margin is required for aging battery voltage sag. |
Compared with LMR36501F3RPER, LMR36501P3RPER trades EMI stability for ultra-low idle current, while LMR36502F3RPER offers direct pin-compatible headroom for higher load demands - both retain identical thermal, voltage, and package specifications.
Availability
LMR36501F3RPER is available at Aetrix Electronics and suitable for factory automation sensors, building HVAC controllers, and portable power tools requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability under thermal stress.
Supply support for LMR36501F3RPER 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 and embedded processing technologies, with decades of expertise in power management IC design and industrial-grade reliability validation.
The LMR3650x product line was engineered specifically for space-constrained, high-temperature industrial power rails - delivering wide-input, low-quiescent, synchronous buck conversion in the industry's smallest 65-V package.
FAQ
What is the maximum input voltage the LMR36501F3RPER can withstand without damage?
The LMR36501F3RPER has an absolute maximum input voltage rating of 70 V, allowing it to survive transient surges on 48-V industrial buses. Its recommended operating input range is 3.0 V (falling threshold) to 65 V, making it suitable for direct connection to unregulated factory power rails without external clamping components. This 70-V rating is verified per TI's absolute maximum ratings table.
Does the LMR36501F3RPER require external feedback resistors for its 3.3-V output?
No, the LMR36501F3RPER does not require external feedback resistors. It is a fixed-output variant with an internally trimmed 3.3-V reference, connecting the VOUT/FB pin directly to the output. This eliminates two external components, reduces layout sensitivity, and ensures ±1.5% output accuracy in FPWM mode across temperature and load - confirmed in Section 7.5 of the datasheet.
How does the LMR36501F3RPER handle light-load conditions compared to PFM-mode variants?
The LMR36501F3RPER uses forced pulse-width modulation (FPWM) mode at all loads, maintaining constant switching frequency from full load down to zero. Unlike PFM variants such as LMR36501P3RPER, it avoids frequency variation and associated output ripple increase, delivering predictable EMI behavior and stable timing for sensitive analog or RF circuits powered from its 3.3-V rail.
What is the purpose of the RT pin on the LMR36501F3RPER, and how is it configured?
The RT pin on the LMR36501F3RPER sets the switching frequency from 200 kHz to 2.2 MHz by connecting an external resistor between RT and GND. For example, tying RT to VCC yields ~1 MHz operation, while a 39.2-kΩ resistor achieves ~400 kHz. The pin must never be left floating, and resistor selection is validated in TI's Electrical Characteristics table (Section 7.5) and Application section (Section 9.2).
Is the LMR36501F3RPER pin-compatible with other devices in the LMR3650x family?
Yes, the LMR36501F3RPER is pin-compatible with LMR36502F3RPER (150 mA) and LMR36503 (300 mA), sharing identical 9-pin VQFN-HR (RPE) package, pinout, and functional assignments. This enables scalable power design - upgrading current capability requires only a BOM change and requalification, not PCB redesign - as explicitly stated in the device comparison table and features list.
LMR36501F3RPER 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:
- 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:
- 100mA
- 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)
LMR36501F3RPER FAQ
1.How can I place an order for LMR36501F3RPER through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36501F3RPER 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 LMR36501F3RPER reliable?
The price and inventory of LMR36501F3RPER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36501F3RPER is usually 5 days.
3.What payment methods are accepted for LMR36501F3RPER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36501F3RPER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36501F3RPER?
LMR36501F3RPER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36501F3RPER 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 LMR36501F3RPER?
For technical support, including LMR36501F3RPER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36501F3RPER requirements.
6.How does Aetrix verify that LMR36501F3RPER is sourced from the original manufacturer or authorized distributors?
All LMR36501F3RPER 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 LMR36501F3RPER meets industry standards.
7.What is the process for return or replacement of LMR36501F3RPER?
All LMR36501F3RPER units undergo pre-shipment inspection (PSI). If there is an issue with LMR36501F3RPER, 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 LMR36501F3RPER part is unused and in its original packaging.
Return procedure for LMR36501F3RPER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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