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Texas Instruments LMR36502P3RPER
- Part No.:
- LMR36502P3RPER
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR36502P3RPER.pdf
- Description:
- IC REG BUCK ADJ/1V 150MA 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,537
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Product details
Overview
LMR36502P3RPER from Texas Instruments is a 65-V input, 150-mA synchronous buck DC/DC converter in a 2-mm × 2-mm HotRod™ VQFN-HR package, delivering fixed 3.3-V output with ±1.5% accuracy in FPWM mode, peak efficiency >80% at 1 MHz, and operation across –40°C to +150°C junction temperature - used in field transmitters and HVAC sensors requiring rugged, compact power conversion.
For engineers reviewing the LMR36502P3RPER datasheet, LMR36502P3RPER pinout, LMR36502P3RPER application, or LMR36502P3RPER equivalent, key selection considerations include its PFM light-load efficiency mode, RT-pin programmable 200 kHz–2.2 MHz switching frequency, precision EN/UVLO with 0.35-V hysteresis, open-drain PGOOD with glitch filtering, and 70-V input transient tolerance.
Technical Context
The LMR36502P3RPER uses peak current mode control with internal compensation, enabling stable regulation with minimal external output capacitance. Its auto-mode operation dynamically transitions between PFM and FPWM based on load, optimizing efficiency across 0–150 mA while maintaining tight output voltage regulation.
It integrates high-side and low-side MOSFETs with 2.2 Ω and 1 Ω typical RDS(on), supports boot capacitor recharge via VBOOT-UVLO (2.3 V threshold), and features thermal shutdown at 168°C with 10°C hysteresis. The RT pin allows resistor-based frequency programming without external clock sources.
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 industrial 24-V/48-V rails with surge margin. |
| Output Current | 0–150 mA continuous - sufficient for powering microcontrollers, analog sensors, and signal chains in space-constrained modules. |
| Output Voltage | Fixed 3.3 V ±1.5% (FPWM) - eliminates external feedback resistors and simplifies layout for standard logic supply rails. |
| Switching Frequency | 200 kHz to 2.2 MHz (RT-programmable) - allows EMI optimization and inductor size reduction without changing PCB layout. |
| Quiescent Current | 4 µA at 24-V input, 0-A load (PFM) - extends battery life in always-on industrial monitoring nodes. |
| Junction Temperature | –40°C to +150°C - supports operation in sealed enclosures or high-ambient environments like factory floors. |
| Package | 2-mm × 2-mm VQFN-HR (RPE, 9-pin) with HotRod™ construction - minimizes parasitic inductance and improves thermal performance over standard QFN. |
Pinout & Package
LMR36502P3RPER is housed in a 2-mm × 2-mm, 9-pin VQFN-HR (RPE) package with wettable flanks and corner anchor pads for enhanced solder joint reliability and automated optical inspection (AOI) compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RT | Frequency programming input | Connect resistor to GND 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 delay (1.96 ms typical); includes 25-µs glitch filter and delayed release. |
| 3 - EN/UVLO | Enable and precision undervoltage lockout | Wakes at 0.4 V, activates at 1.263 V with 0.35-V hysteresis; supports remote UVLO via external resistor divider. |
| 4 - VIN | Main power input | Accepts 3.6–65 V; requires local high-quality bypass capacitor directly to GND for stability and EMI suppression. |
| 5 - SW | Power switch node | Connects to inductor; carries high di/dt; minimized ringing reduces conducted and radiated EMI. |
| 6 - BOOT | Bootstrap supply | Requires 0.1-µF ceramic capacitor to SW; enables high-side MOSFET drive; UVLO triggers at 2.3 V. |
| 7 - VCC | Internal LDO output | 3.15-V regulated supply for control circuitry; not for external loads; requires 1-µF decoupling to GND. |
| 8 - VOUT/FB | Output voltage sense / feedback | Configured as fixed 3.3-V output; no external resistors needed; internal reference = 1.0 V ±1%. |
| 9 - GND | Power ground | Common return for VIN, SW, and VCC; must connect to CIN with short, wide traces to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Peak current mode control with internal compensation | Enables stable regulation using only 10-µF output capacitance - reduces BOM count and board area vs. externally compensated converters. |
| Auto-mode PFM/FPWM transition | Automatically switches to PFM below ~10 mA load to maintain >80% efficiency down to µA-level currents - ideal for intermittent-sensing applications. |
| 70-V input transient protection | Withstands 70-V spikes without latch-up or damage - eliminates need for upstream TVS diodes in 48-V industrial systems. |
| HotRod™ package with corner anchors | Reduces package inductance by >50% vs. standard QFN and improves solder joint strength - critical for high-reliability automotive and factory automation deployments. |
| Integrated PGOOD with delayed release | Eliminates external reset supervisor IC; built-in 2-ms delay ensures output settles before asserting "power OK" - simplifies system-level power sequencing. |
Applications
| Field Transmitter Power | HVAC Sensor Node |
|---|---|
Use Scenario: Powers 4–20 mA loop-powered field transmitters in chemical process plants where ambient temperatures exceed 85°C and input voltage varies from 12 V to 48 V. IC Role / Device Role / Timing Role: Primary DC/DC regulator converting raw loop supply to clean 3.3-V rail for ADC, MCU, and analog front-end. Use Value: 150-mA output headroom supports sensor excitation and digital processing; 150°C max junction rating ensures uninterrupted operation in uncooled enclosures. | Use Scenario: Supplies 3.3-V logic and analog circuitry in battery-backed HVAC smoke detectors mounted in ceiling plenums with limited airflow. IC Role / Device Role / Timing Role: Standby power manager delivering ultra-low quiescent current during sleep mode and fast wake-up response upon alarm trigger. Use Value: 4-µA quiescent current extends 10-year battery life; PGOOD signal synchronizes MCU wake-up with stable rail establishment. |
| Garden Tool Control Module | Industrial Earbud Test Fixture |
Use Scenario: Provides regulated 3.3-V supply for motor control logic and BLE radio in cordless garden trimmers exposed to vibration, dust, and 85°C ambient. IC Role / Device Role / Timing Role: Compact, rugged point-of-load converter replacing discrete LDO + external buck solutions. Use Value: 2-mm × 2-mm footprint saves >60% board area vs. legacy 3-mm × 3-mm alternatives; HotRod™ anchors prevent solder joint fracture under mechanical shock. | Use Scenario: Powers calibration circuitry and audio codec in automated test fixtures verifying earbud battery charging and audio playback performance. IC Role / Device Role / Timing Role: Precision voltage source ensuring consistent bias conditions across production test cycles. Use Value: ±1.5% output accuracy guarantees measurement repeatability; RT-programmable frequency avoids interference with audio band during testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36502P5RPER | Fixed 5-V output instead of 3.3 V; identical current rating, package, and feature set. | Used where downstream logic requires 5-V I/O compatibility rather than 3.3-V MCU cores. | Select when system architecture mandates 5-V rail; no layout or firmware changes required beyond output capacitor value. |
| LMR36503P3RPER | Pin-compatible 300-mA variant with same 3.3-V fixed output and 65-V input range. | Suitable for designs anticipating future current scaling (e.g., adding wireless connectivity or higher-resolution sensors). | Choose for forward-compatible designs needing headroom; shares identical footprint and control interface but delivers double the output current. |
Compared with LMR36502P3RPER, LMR36502P5RPER provides identical performance at 5 V instead of 3.3 V, while LMR36503P3RPER doubles output current to 300 mA within the same 2-mm × 2-mm footprint - enabling either voltage or current scalability without redesigning the power stage layout.
Availability
LMR36502P3RPER is available at Aetrix Electronics and suitable for factory automation, building HVAC controls, and portable power tool electronics requiring stable component supply, long-term industrial lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LMR36502P3RPER 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 industrial-grade product development and manufacturing excellence.
The LMR3650x product line was engineered specifically for space-constrained, high-reliability industrial power supplies - emphasizing ultra-small footprint, wide input range, extended temperature operation, and functional safety readiness.
FAQ
What is the maximum input voltage transient the LMR36502P3RPER can withstand?
The LMR36502P3RPER is rated to withstand input voltage transients up to 70 V without damage or latch-up, exceeding its 65-V maximum operating input voltage. This capability allows direct connection to 48-V industrial buses with built-in surge margin, eliminating the need for external TVS diodes in many applications. The device maintains regulation during such transients due to robust internal FETs and gate drive design.
Does the LMR36502P3RPER require external compensation components?
No, the LMR36502P3RPER uses peak current mode control with internal compensation, so no external compensation network is required. This simplifies design and reduces solution size - only input and output capacitors, an inductor, and optional RT resistor are needed. The internal loop is optimized for stability with minimal output capacitance (as low as 10 µF), making it ideal for space-constrained industrial modules.
How does the PGOOD pin on the LMR36502P3RPER behave during startup?
The PGOOD pin on the LMR36502P3RPER asserts high after a typical 1.96-ms delay following soft-start completion, indicating that the output has reached ≥90% of target voltage and remains within regulation. It includes a 25-µs glitch filter and delayed release to prevent false toggling during load transients. When EN is pulled low, PGOOD immediately goes low, providing reliable system-level power sequencing without external supervision.
Can the LMR36502P3RPER operate efficiently at very light loads?
Yes, the LMR36502P3RPER operates in PFM (pulse-frequency modulation) mode at light loads (<10 mA), achieving >80% efficiency even at 100-µA output current. Its 4-µA quiescent current at 24-V input and zero load ensures minimal standby power draw - critical for battery-powered field instruments and always-on sensor nodes where energy conservation is essential.
What is the purpose of the RT pin on the LMR36502P3RPER?
The RT pin on the LMR36502P3RPER allows resistor-based programming of the switching frequency from 200 kHz to 2.2 MHz. Connecting a resistor from RT to GND sets the oscillator frequency; for example, tying RT to VCC yields ~1 MHz. This flexibility enables EMI optimization, inductor size reduction, and noise avoidance in sensitive analog or RF subsystems - all without modifying the PCB layout or requiring external clock sources.
LMR36502P3RPER 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:
- 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)
LMR36502P3RPER FAQ
1.How can I place an order for LMR36502P3RPER through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36502P3RPER 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 LMR36502P3RPER reliable?
The price and inventory of LMR36502P3RPER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36502P3RPER is usually 5 days.
3.What payment methods are accepted for LMR36502P3RPER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36502P3RPER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36502P3RPER?
LMR36502P3RPER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36502P3RPER 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 LMR36502P3RPER?
For technical support, including LMR36502P3RPER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36502P3RPER requirements.
6.How does Aetrix verify that LMR36502P3RPER is sourced from the original manufacturer or authorized distributors?
All LMR36502P3RPER 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 LMR36502P3RPER meets industry standards.
7.What is the process for return or replacement of LMR36502P3RPER?
All LMR36502P3RPER units undergo pre-shipment inspection (PSI). If there is an issue with LMR36502P3RPER, 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 LMR36502P3RPER part is unused and in its original packaging.
Return procedure for LMR36502P3RPER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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