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Texas Instruments LMR36502FS5RPER
- Part No.:
- LMR36502FS5RPER
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR36502FS5RPER.pdf
- Description:
- IC REG BUCK ADJ/1V 150MA 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,484
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Product details
Overview
LMR36502FS5RPER from Texas Instruments is a 65-V input, 150-mA 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, 70-V transient input protection, and –40°C to +150°C junction temperature operation - deployed in industrial field transmitters and HVAC fire-safety detectors.
For engineers reviewing the LMR36502FS5RPER datasheet, LMR36502FS5RPER pinout, LMR36502FS5RPER application, or LMR36502FS5RPER equivalent, key selection considerations include its spread-spectrum capability, FPWM light-load behavior, RT-pin programmable frequency (200 kHz–2.2 MHz), PGOOD with glitch filtering, and precision EN/UVLO with 0.35-V hysteresis for rugged startup control.
Technical Context
The LMR36502FS5RPER uses peak current-mode control with internal compensation, enabling stable regulation with minimal output capacitance and eliminating external loop compensation components. Its auto-mode switching dynamically transitions between PFM and FPWM based on load, while the integrated LDO supplies internal circuitry at 3.15 V with 50–120 mA current limit.
It implements precision enable logic with wake-up threshold (0.4 V), high-level activation (1.263 V), and 0.35-V hysteresis; PGOOD provides delayed release (1.956 ms) and 1.2% hysteresis around VOUT/FB; and thermal shutdown triggers at 168°C with 10°C hysteresis for robust overtemperature protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6 V to 65 V operating; withstands 70-V transients - enables direct connection to unregulated industrial rails without pre-regulation. |
| Output Voltage | Fixed 5.0 V ±1.5% (FPWM mode) - eliminates feedback resistor network, reducing BOM count and layout sensitivity. |
| Max Output Current | 150 mA continuous - supports low-power sensors, transceivers, and microcontroller peripherals in space-constrained systems. |
| Switching Frequency | Programmable 200 kHz to 2.2 MHz via RT-to-GND resistor - allows EMI optimization and inductor size trade-offs across applications. |
| Quiescent Current | 4 µA at 24-V input, 0-A load (PFM mode) - extends battery life in always-on industrial monitoring nodes. |
| Thermal Range | –40°C to +150°C junction temperature - qualified for under-hood, factory-floor, and enclosed industrial environments. |
| Spread Spectrum | Enabled - reduces peak EMI by modulating switching frequency, easing compliance with CISPR-22/32 Class B limits. |
Pinout & Package
Package: RPE (VQFN-HR, 9-pin), 2.00 mm × 2.00 mm, ultra-small HotRod™ footprint with corner anchor pins for enhanced solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT | Frequency programming input | Resistor-to-GND sets switching frequency from 200 kHz to 2.2 MHz; must not be left floating. |
| PGOOD | Open-drain power-good flag | Indicates regulated output with built-in 25-µs glitch filter and 1.956-ms delayed high assertion - replaces external supervisor IC. |
| EN/UVLO | Enable and precision undervoltage lockout | 0.4-V wake-up, 1.263-V active threshold, 0.35-V hysteresis - enables reliable cold-start and brownout recovery. |
| VIN | Main power input | Accepts 3.6–65 V; handles 70-V transients - suitable for 24-V/48-V industrial buses with surge exposure. |
| SW | Switch node | Connects to external power inductor; minimized ringing reduces EMI and simplifies layout. |
| BOOT | Bootstrap supply | Requires 0.1-µF capacitor to SW - sustains high-side gate drive during duty cycles up to 98%. |
| VCC | Internal LDO output | 3.15-V regulated supply for control circuitry; 1-µF bypass required - not for external loading. |
| VOUT/FB | Output voltage sense / feedback | Fixed 5-V output; internally connected to reference - no external resistors needed. |
| 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 |
|---|---|
| Spread-spectrum modulation | Reduces peak radiated emissions by spreading energy across frequency band - aids EMC certification without added shielding. |
| FPWM light-load operation | Maintains constant switching frequency down to zero load - ensures predictable timing, avoids audible noise, and simplifies EMI filtering. |
| Integrated PGOOD with delay | Eliminates need for external reset supervisor IC - saves board area and reduces system BOM cost. |
| HotRod™ packaging | 2-mm × 2-mm VQFN-HR with corner anchors - improves thermal performance (RθJA = 85.7°C/W) and solder joint reliability in thermal cycling environments. |
| Internal compensation | Removes requirement for external compensation network - accelerates design cycle and improves consistency across production units. |
Applications
| Field Transmitters | HVAC Fire Detectors |
|---|---|
Use Scenario: 4–20 mA loop-powered sensor transmitting pressure, temperature, or flow data in hazardous factory zones. IC Role / Device Role / Timing Role: Primary 5-V local regulator powering analog front-end, ADC, and HART modem from 24-V loop supply. Use Value: 70-V transient tolerance prevents latch-up during lightning-induced surges; 150°C rating ensures operation inside sealed enclosures. | Use Scenario: Battery-backed smoke/CO detector with self-test, wireless reporting, and LED indicators in commercial buildings. IC Role / Device Role / Timing Role: Efficient 5-V supply for MCU, RF transceiver, and sensor interface during both AC-powered and backup battery operation. Use Value: 4-µA quiescent current extends 10-year battery life; spread spectrum meets strict building EMC requirements. |
| Garden Power Tools | Industrial Headphones |
Use Scenario: Cordless brushless drill with motor controller, battery gauge, and LED status display. IC Role / Device Role / Timing Role: Secondary 5-V rail derived from 18–60-V Li-ion pack for digital logic and communication interfaces. Use Value: Wide 3.6–65-V input range accommodates full battery discharge curve; 150-mA output supports BLE+audio SoC. | Use Scenario: Noise-cancelling industrial headphones with active analog circuitry, Bluetooth LE, and touch controls. IC Role / Device Role / Timing Role: Low-noise 5-V supply for audio codec, DSP, and RF section powered from single-cell Li-ion (3.0–4.2 V). Use Value: FPWM mode prevents frequency modulation artifacts in audio path; compact 4-mm² footprint fits within earcup housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36502PS5RPER | Same 150-mA, 5-V fixed output, but uses PFM (not FPWM) light-load mode and lacks spread spectrum. | Better light-load efficiency; unsuitable where constant-frequency operation is required for EMI predictability or audio-sensitive circuits. | Select when lowest quiescent current (<4 µA) is critical and spread spectrum is unnecessary. |
| LMR36503FS5RPER | Pin-compatible 300-mA variant with identical 5-V fixed output, FPWM, and spread spectrum - higher current capability only. | Supports higher-power peripherals (e.g., dual-band Wi-Fi, larger displays); same PCB layout and control interface. | Select when future-proofing for >150-mA loads or adding functionality without redesigning power stage. |
Compared with LMR36502PS5RPER, the LMR36502FS5RPER trades ~1 µA higher quiescent current for deterministic FPWM timing and EMI reduction via spread spectrum; compared with LMR36503FS5RPER, it offers identical features at lower cost and thermal footprint where 150-mA suffices.
Availability
LMR36502FS5RPER is available at Aetrix Electronics and suitable for factory automation, building safety systems, and portable industrial tools requiring stable component supply, long-term manufacturability, and automotive-grade thermal resilience.
Supply support for LMR36502FS5RPER 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 connectivity technologies, serving industrial, automotive, and personal electronics markets.
The LMR3650x product line delivers ultra-compact, high-voltage synchronous buck converters optimized for rugged industrial power rails - emphasizing small solution size, wide temperature operation, and simplified design through integrated features like PGOOD and internal compensation.
FAQ
What is the maximum input voltage transient the LMR36502FS5RPER can withstand?
The LMR36502FS5RPER is rated to withstand input voltage transients up to 70 V, exceeding its 65-V maximum operating input voltage. This capability protects against inductive kickback and surge events common in industrial 24-V and 48-V systems, ensuring reliable operation without external TVS clamping in many cases. The absolute maximum rating for VIN to GND is 70 V, as specified in Section 7.1 of the datasheet.
Does the LMR36502FS5RPER require external compensation components?
No, the LMR36502FS5RPER uses an internally compensated peak current-mode control architecture, eliminating the need for external compensation networks such as type-II or type-III compensators. This simplifies design, reduces bill-of-materials cost, and improves production consistency. The internal compensation is optimized for stability with minimal output capacitance, supporting ceramic capacitors as low as 4.7 µF.
How does the spread-spectrum feature of the LMR36502FS5RPER improve EMI performance?
The LMR36502FS5RPER's spread-spectrum modulation dithers the switching frequency across a defined bandwidth, distributing radiated energy and reducing peak amplitudes in EMI scans. This directly lowers measured emissions at fundamental and harmonic frequencies, easing compliance with CISPR-22/32 Class B limits - especially critical in densely packed industrial modules where metal shielding is impractical.
What is the purpose of the RT pin on the LMR36502FS5RPER?
The RT pin on the LMR36502FS5RPER allows precise external programming of the switching frequency from 200 kHz to 2.2 MHz using a single resistor to ground. This enables designers to avoid sensitive frequency bands (e.g., AM radio), optimize inductor size versus efficiency, and balance EMI performance with thermal constraints. The RT pin must never be left floating and requires a stable resistor value per the frequency calculation formula in Section 8.3.2.
Can the LMR36502FS5RPER operate with input voltages below 3.6 V?
The LMR36502FS5RPER has a minimum operating input voltage of 3.6 V (rising threshold) and 3.0 V (falling threshold) after startup. Below 3.0 V, the device shuts down and ceases regulation. It cannot start from or sustain operation at sub-3.0-V inputs. For applications requiring lower VIN operation, alternative devices such as the LMR336xx series would be necessary.
What is the function of the EN/UVLO pin on the LMR36502FS5RPER?
The EN/UVLO pin on the LMR36502FS5RPER provides precision enable control and undervoltage lockout: it wakes the device at 0.4 V, activates regulation at 1.263 V, and incorporates 0.35-V hysteresis to prevent chatter during brownout conditions. It is high-voltage tolerant (up to 70 V), allowing direct connection to VIN for simple enable control or use with external resistor dividers for custom UVLO thresholds.
LMR36502FS5RPER 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:
- 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)
LMR36502FS5RPER FAQ
1.How can I place an order for LMR36502FS5RPER through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36502FS5RPER 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 LMR36502FS5RPER reliable?
The price and inventory of LMR36502FS5RPER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36502FS5RPER is usually 5 days.
3.What payment methods are accepted for LMR36502FS5RPER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36502FS5RPER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36502FS5RPER?
LMR36502FS5RPER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36502FS5RPER 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 LMR36502FS5RPER?
For technical support, including LMR36502FS5RPER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36502FS5RPER requirements.
6.How does Aetrix verify that LMR36502FS5RPER is sourced from the original manufacturer or authorized distributors?
All LMR36502FS5RPER 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 LMR36502FS5RPER meets industry standards.
7.What is the process for return or replacement of LMR36502FS5RPER?
All LMR36502FS5RPER units undergo pre-shipment inspection (PSI). If there is an issue with LMR36502FS5RPER, 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 LMR36502FS5RPER part is unused and in its original packaging.
Return procedure for LMR36502FS5RPER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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