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Texas Instruments LMR36501F5RPER
- Part No.:
- LMR36501F5RPER
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR36501F5RPER.pdf
- Description:
- IC REG BUCK ADJ/1V 100MA 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,746
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Product details
Overview
LMR36501F5RPER from Texas Instruments is a 100-mA, 3-V to 65-V synchronous buck DC/DC converter in a 2-mm × 2-mm HotRod™ VQFN-HR (RPE) package, delivering fixed 5-V output with ±1.5% accuracy in FPWM mode, 80%+ peak efficiency at 1 MHz, and input transient tolerance up to 70 V. It serves as a compact, rugged front-end power regulator for industrial sensors and portable electronics requiring stable low-current bias rails.
For engineers reviewing the LMR36501F5RPER datasheet, LMR36501F5RPER pinout, LMR36501F5RPER application, or LMR36501F5RPER equivalent, key selection considerations include its FPWM light-load operation, RT-pin programmable frequency (200 kHz–2.2 MHz), precision EN/UVLO thresholds (1.16–1.36 V enable high), PGOOD with glitch filtering, and –40°C to +150°C junction temperature rating.
Technical Context
The LMR36501F5RPER implements peak current mode control with internal compensation, enabling stable regulation using minimal external output capacitance. Its architecture supports automatic frequency foldback during input transients or dropout conditions to maintain duty cycle integrity.
It integrates a high-side MOSFET (2.2 Ω RDS(on)) and low-side MOSFET (1 Ω RDS(on)), precision reference (0.985–1.01 V), and dedicated BOOT, VCC, and RT pins for bootstrap management and frequency tuning. The EN/UVLO pin provides remote undervoltage lockout with 0.35 V hysteresis and wake-up threshold at 0.4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 100 mA continuous - supports low-power industrial sensors and portable audio peripherals without thermal derating under typical conditions. |
| Input voltage range | 3.0 V (falling) to 65 V - withstands 70-V transients, enabling direct connection to unregulated 24-V/48-V industrial buses. |
| Output voltage | Fixed 5 V ±1.5% (FPWM) - eliminates external feedback resistors; suitable for USB-peripheral bias and logic supply rails. |
| Switching frequency | 200 kHz to 2.2 MHz via RT-to-GND resistor - allows EMI optimization and inductor size reduction across diverse PCB layouts. |
| Quiescent current | 0.25–1.05 µA (non-switching, VIN = 13.5 V) - enables multi-year battery life in always-on field transmitters. |
| Junction temperature | –40°C to +150°C - rated for deployment in enclosed enclosures or high-ambient environments like HVAC ducts or motor drives. |
| Package | VQFN-HR (RPE), 9-pin, 2.0 mm × 2.0 mm - ultra-compact footprint with corner anchor pads for high-reliability solder joints in vibration-prone applications. |
Pinout & Package
VQFN-HR (RPE) package: 9-pin, 2.0 mm × 2.0 mm body, wettable flank terminals, exposed thermal pad (GND-connected).
| 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; must not be left floating. |
| 2 - PGOOD | Open-drain power-good flag | Signals valid output after soft-start delay (1.956 ms typical); includes 25-µs glitch filter and delayed release to avoid false resets. |
| 3 - EN/UVLO | Enable and precision UVLO input | Wakes at 0.4 V, enables regulation at 1.16–1.36 V, with 0.285–0.425 V hysteresis - supports remote input monitoring or sequenced startup. |
| 4 - VIN | Main power input | Accepts 3–65 V; requires local high-quality bypass capacitor to GND for EMI suppression and transient response. |
| 5 - SW | Power switch node | Drives external inductor; exhibits minimized ringing due to optimized HotRod™ layout - reduces need for snubbers. |
| 6 - BOOT | Bootstrap supply | Connects via 0.1-µF capacitor to SW to gate-drive high-side FET; UVLO threshold at 2.14–2.42 V ensures reliable turn-on. |
| 7 - VCC | Internal LDO output | 3.1–3.25 V regulated supply for control circuitry; supplies PGOOD logic; requires 1-µF decoupling to GND. |
| 8 - VOUT/FB | Output sense / feedback | Fixed 5-V variant - connects directly to output rail; no external divider needed; FB input current ≤30 nA minimizes load error. |
| 9 - GND | Power ground | Common return for VIN, SW, BOOT, VCC, and PGOOD; must be tied to system ground with short, wide traces. |
Key Features
| Feature | Design Value |
|---|---|
| FPWM light-load operation | Eliminates frequency variation and output ripple at light loads - critical for noise-sensitive analog sensor signal chains. |
| Integrated PGOOD with delayed release | Replaces external voltage supervisors; built-in 25-µs glitch filter and 1.956-ms activation delay ensure robust system reset timing. |
| Ultra-small HotRod™ package | 2-mm × 2-mm footprint with corner anchor pads improves solder joint reliability and reduces board area by >40% vs. standard QFN. |
| Input transient protection | Rated for 70-V transients and operates down to 3.0-V falling input - enables use in automotive stop-start or factory power bus environments. |
| Thermal shutdown with hysteresis | Shuts down at 158–180°C with 8–15°C hysteresis - prevents thermal cycling damage during overload or poor heatsinking. |
Applications
| Field Transmitters | HVAC Sensors |
|---|---|
|
Use Scenario: 4–20 mA loop-powered pressure/temperature transmitter in oil & gas pipeline monitoring. IC Role / Device Role / Timing Role: Primary 5-V bias regulator for signal conditioning ADC, DAC, and HART modem. Use Value: 0.25 µA non-switching IQ extends battery life beyond 10 years; 65-V input range accommodates long cable drops and surge events. |
Use Scenario: Wireless CO₂ and humidity sensor node mounted inside HVAC air handling units. IC Role / Device Role / Timing Role: Compact 5-V supply for ultra-low-power MCU, RF transceiver, and electrochemical sensors. Use Value: 2-mm × 2-mm package fits within tight enclosure constraints; –40°C to +150°C rating ensures operation near hot ductwork. |
| Garden Power Tools | Wireless Earbuds |
|
Use Scenario: Cordless string trimmer with integrated battery fuel gauge and LED status display. IC Role / Device Role / Timing Role: Secondary 5-V rail derived from 18–21 V Li-ion pack for display driver and BLE SoC. Use Value: 70-V transient tolerance survives motor commutation spikes; FPWM mode prevents audible coil whine during idle. |
Use Scenario: Charging case for true wireless stereo earbuds with integrated battery management and LED indicators. IC Role / Device Role / Timing Role: Efficient 5-V output stage powering USB-C PD negotiation IC and status LEDs. Use Value: 80%+ efficiency at 1 MHz reduces heat buildup in sealed plastic housing; small footprint maximizes battery volume. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36501P5RPER | Same 100-mA, 5-V fixed output, but uses PFM (not FPWM) light-load mode - higher light-load efficiency but variable frequency. | Better for ultra-low-power sleep modes where EMI is secondary; unsuitable where constant-frequency operation is required. | Select LMR36501F5RPER when fixed-frequency ripple control or noise immunity is mandatory; choose P5RPER only if lowest IQ dominates design priority. |
| LMR36502F5RPER | 150-mA version with identical 5-V fixed output, FPWM mode, and pinout - higher current capability and slightly different current limits (ISC = 210–298 mA). | Supports higher-output peripherals (e.g., dual-band BLE + NFC) without redesign; same PCB layout but higher thermal margin. | Choose LMR36502F5RPER if future-proofing for 120–150 mA loads is needed; LMR36501F5RPER remains optimal for cost- and size-constrained 100-mA designs. |
Compared with LMR36501P5RPER and LMR36502F5RPER, the LMR36501F5RPER uniquely balances fixed-frequency operation, minimal solution size, and industrial-grade ruggedness - making it the preferred choice for space-limited, noise-sensitive, and thermally constrained 100-mA applications.
Availability
LMR36501F5RPER is available at Aetrix Electronics and suitable for factory automation, building HVAC systems, and portable power tool designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LMR36501F5RPER 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 power management technologies, with decades of expertise in high-reliability industrial and automotive power solutions.
The LMR3650x product line was designed specifically for space-constrained, wide-input industrial power rails - emphasizing ultra-small packaging, extended temperature operation, and simplified design through internal compensation and integrated features like PGOOD and EN/UVLO.
FAQ
What is the maximum input voltage transient the LMR36501F5RPER can survive?
The LMR36501F5RPER is rated to withstand input voltage transients up to 70 V without damage or malfunction, while maintaining continuous operation across its specified 3.0-V (falling) to 65-V operating range. This capability is validated per absolute maximum ratings and enables direct connection to industrial 24-V or 48-V buses subject to load dump or inductive kick events. The LMR36501F5RPER incorporates internal protection circuits that clamp and sustain such transients without requiring external TVS diodes in many implementations.
Does the LMR36501F5RPER require external feedback resistors for its 5-V output?
No, the LMR36501F5RPER is a fixed 5-V output variant - the VOUT/FB pin is internally configured to deliver 5 V ±1.5% in FPWM mode, eliminating the need for external feedback resistors. This simplifies layout, reduces BOM count, and improves accuracy by removing resistor tolerance and thermal drift errors. The device's internal reference voltage is tightly regulated at 0.985–1.01 V, and the feedback input current is ≤30 nA, ensuring negligible loading error on the output node.
How does the EN/UVLO pin function on the LMR36501F5RPER?
The EN/UVLO pin on the LMR36501F5RPER provides precision enable control with three distinct states: shutdown (VEN < 0.4 V), standby (0.4 V ≤ VEN < 1.16 V), and active regulation (VEN ≥ 1.16 V). It features 0.285–0.425 V hysteresis to prevent chatter during brownout conditions and supports remote undervoltage detection when used with external resistor dividers. The pin is high-voltage tolerant (up to 70 V), allowing direct connection to VIN without level-shifting - a key enabler for simple, robust power sequencing in industrial systems.
What is the purpose of the RT pin on the LMR36501F5RPER?
The RT pin on the LMR36501F5RPER sets the switching frequency from 200 kHz to 2.2 MHz by connecting an external resistor between RT and GND. This resistor value determines oscillator timing without requiring external clock sources or complex configuration. For example, tying RT to VCC yields ~1 MHz operation, while a 39.2-kΩ resistor achieves ~400 kHz. The RT pin must never be left floating, as this may cause unpredictable frequency behavior or instability. Frequency selection directly impacts inductor size, EMI profile, and light-load efficiency trade-offs.
Can the LMR36501F5RPER be used in automotive applications?
The LMR36501F5RPER is not AEC-Q200 qualified and lacks automotive-specific qualification, but its –40°C to +150°C junction temperature rating, 70-V transient tolerance, and robust EN/UVLO functionality make it suitable for certain under-hood or infotainment auxiliary power applications where full automotive qualification is not mandated. It has been deployed in industrial vehicle telematics and off-road equipment power supplies. For production automotive ECUs, TI recommends AEC-Q100-qualified alternatives such as the LM61480-Q1; the LMR36501F5RPER should undergo full system-level validation for each intended automotive use case.
LMR36501F5RPER 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 (5V)
- 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)
LMR36501F5RPER FAQ
1.How can I place an order for LMR36501F5RPER through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36501F5RPER 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 LMR36501F5RPER reliable?
The price and inventory of LMR36501F5RPER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36501F5RPER is usually 5 days.
3.What payment methods are accepted for LMR36501F5RPER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36501F5RPER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36501F5RPER?
LMR36501F5RPER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36501F5RPER 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 LMR36501F5RPER?
For technical support, including LMR36501F5RPER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36501F5RPER requirements.
6.How does Aetrix verify that LMR36501F5RPER is sourced from the original manufacturer or authorized distributors?
All LMR36501F5RPER 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 LMR36501F5RPER meets industry standards.
7.What is the process for return or replacement of LMR36501F5RPER?
All LMR36501F5RPER units undergo pre-shipment inspection (PSI). If there is an issue with LMR36501F5RPER, 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 LMR36501F5RPER part is unused and in its original packaging.
Return procedure for LMR36501F5RPER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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