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Texas Instruments LMR43610R3RPER
- Part No.:
- LMR43610R3RPER
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43610R3RPER.pdf
- Description:
- IC REG BUCK ADJ/3.3V 1A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,733
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Product details
Overview
LMR43610R3RPER from Texas Instruments is a 36-V, 1-A synchronous step-down DC/DC converter in a 2-mm × 2-mm HotRod™ QFN (RPE) package, featuring fixed 3.3-V output, adjustable switching frequency (200 kHz–2.2 MHz via RT pin), <2.5 µA quiescent current at 150°C, and support for 42-V input transients. It serves as a compact, low-EMI power supply core in industrial field transmitters and process sensors.
For engineers reviewing the LMR43610R3RPER datasheet, LMR43610R3RPER pinout, LMR43610R3RPER application, or LMR43610R3RPER equivalent, key selection considerations include its 1-A rated output, 3.3-V fixed VOUT configuration, RT-pin-based frequency adjustability, thermal robustness to 150°C TJ, and compatibility with ultra-low EMI layouts using dual random spread spectrum and optimized HotRod™ pinout.
Technical Context
The LMR43610R3RPER uses peak current mode control with internal compensation to minimize external components and output capacitance. Its RT pin enables precise frequency setting between 200 kHz and 2.2 MHz, avoiding noise-sensitive bands without requiring external clock synchronization.
It implements frequency foldback during dropout to maintain regulation under low VIN conditions, supports PFM operation at light loads for ultra-low IQ (<2.5 µA), and integrates protection features including thermal shutdown (158–186°C trip), overvoltage/undervoltage detection on PGOOD, and high-side/low-side MOSFET current limiting (1.4–2.1 A peak, 0.85–1.4 A valley).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 36 V, supports 42-V transients - enables direct connection to 24-V industrial rails with surge margin. |
| Output Voltage | Fixed 3.3 V ±1% - eliminates feedback resistor network, reduces BOM count and layout sensitivity. |
| Max Output Current | 1 A continuous - sufficient for powering microcontrollers, analog front-ends, and isolated interface ICs in field devices. |
| Quiescent Current | 1.3 µA at 24 VIN/5 VOUT; <2.5 µA at 150°C - enables always-on operation in battery-backed or energy-harvested systems. |
| Switching Frequency | Adjustable 200 kHz–2.2 MHz via RT pin - allows optimization for efficiency (low f), size (high f), or EMI (avoid AM/FM bands). |
| Junction Temp Range | –40°C to +150°C - qualified for harsh environments including motor drives, factory floor enclosures, and HVAC ducts. |
| Package | 9-pin VQFN-HR (RPE), 2.0 mm × 2.0 mm - ultra-compact footprint with wettable flanks for automated optical inspection and reliable solder joints. |
Pinout & Package
LMR43610R3RPER is housed in a 2-mm × 2-mm, 9-pin HotRod™ QFN (RPE) package with wettable flanks and corner anchor pins for enhanced solder joint reliability. Thermal resistance RθJA = 84.4°C/W (JEDEC 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RT | Frequency Set Input | Connects to resistor-to-GND to set switching frequency from 200 kHz to 2.2 MHz; not used for MODE/SYNC variants. |
| 2 - PGOOD | Open-Drain Power-Good Flag | Asserts high when VOUT is within ±3% of target; provides system reset timing without external supervisor IC. |
| 3 - EN/UVLO | Enable & Input UVLO Input | Active-high enable with precision thresholds (0.7 V wake-up, 1.23 V turn-on); supports direct VIN tie for simple start-up. |
| 4 - VIN | Main Input Supply | Accepts 3.0–36 V; requires local high-quality bypass capacitor to GND for stability and transient response. |
| 5 - SW | Switch Node | Connects to power inductor; carries high di/dt; must be routed with minimal loop area to reduce EMI. |
| 6 - BOOT | Bootstrap Supply | Requires 100-nF ceramic capacitor to SW; supplies gate drive for internal high-side MOSFET. |
| 7 - VCC | Internal LDO Output | 3.3-V regulated supply for control circuitry; decoupled with 1-µF capacitor to GND; not for external loading. |
| 8 - VOUT/FB | Output Sense / Feedback | Configured as fixed 3.3-V output - connected directly to VOUT node; no external resistors required. |
| 9 - GND | Power Ground | Primary return path for high-current loops; must be tied to CIN with short, wide traces to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Quiescent Current | 1.3 µA at 24 VIN/5 VOUT, <2.5 µA at 150°C - extends battery life in always-on industrial sensors and enables cold-junction operation. |
| Integrated Spread Spectrum | Dual random modulation - reduces peak EMI by >10 dB across 150 kHz–1 GHz without external filters or shielding. |
| Thermal Robustness | Rated for 150°C TJMAX with thermal shutdown at 158–186°C - supports operation in sealed enclosures near motors or power electronics. |
| Internal Compensation | No external compensation network required - simplifies design, reduces component count, and improves production yield. |
| Wettable Flank QFN | 2-mm × 2-mm RPE package with solderable side walls - enables AOI verification of solder joints and improves long-term reliability in thermal cycling environments. |
Applications
| Factory Automation: Field Transmitters | Building Automation: HVAC Sensors |
|---|---|
Use Scenario: 4–20 mA loop-powered pressure/temperature transmitter operating in explosion-proof enclosures with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Primary 3.3-V bias rail generator for ADC, MCU, and signal conditioning circuitry; maintains regulation during 42-V line surges. Use Value: Enables single-supply operation from 24-V loop with <2.5 µA IQ, eliminating need for auxiliary batteries or oversized capacitors for hold-up. | Use Scenario: Wireless CO₂ and humidity sensor node mounted inside HVAC ducts, powered by energy harvesting or coin-cell backup. IC Role / Device Role / Timing Role: Ultra-low-IQ buck regulator supplying 3.3-V logic and RF transceiver; operates continuously at –40°C to +85°C ambient. Use Value: Delivers >85% efficiency at 1 mA load and sustains regulation down to 3.0 VIN, extending operational time per charge cycle. |
| Appliances: Cordless Power Tools | Industrial IoT: Edge Node Controllers |
Use Scenario: Brushless motor controller PCB where space is constrained and thermal management is limited by plastic housing. IC Role / Device Role / Timing Role: Secondary 3.3-V supply for gate driver logic, MCU, and communication interface; withstands 42-V battery transients during motor commutation. Use Value: 2-mm × 2-mm footprint saves >30% board area vs. comparable 3-A converters; wettable flanks ensure solder joint integrity under vibration. | Use Scenario: DIN-rail mounted PLC I/O module requiring isolated 3.3-V logic rail with functional safety awareness. IC Role / Device Role / Timing Role: Safety-capable DC/DC stage feeding isolated power domain; supports diagnostic monitoring via PGOOD and thermal flag. Use Value: Documentation available for ISO 26262/IEC 61508 system-level safety design; eliminates need for external watchdog or thermal monitor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR43610MB3RPER | Same 1-A, 3.3-V fixed output, but includes MODE/SYNC pin for FPWM selection and external clock sync - adds pin count and complexity. | Required where system-level EMI coordination or forced constant-frequency operation at light loads is mandatory. | Select LMR43610MB3RPER only if PFM/FPWM mode switching or synchronization with other regulators is needed; otherwise LMR43610R3RPER offers lower cost and simpler layout. |
| LMR36503RDRR | 65-V, 300-mA buck; smaller 2-mm × 2-mm WSON package; no spread spectrum; higher IQ (~5 µA). | Suitable for lower-power, higher-input-voltage applications where 300-mA output suffices and EMI is less critical. | Choose LMR36503RDRR only for 65-V input systems with sub-300-mA loads; LMR43610R3RPER provides 3.3× higher current and superior EMI performance at same footprint. |
Compared with LMR43610MB3RPER, LMR43610R3RPER trades external sync capability for lower BOM cost and simplified routing; compared with LMR36503RDRR, it delivers triple output current, integrated spread spectrum, and <50% lower IQ - making it optimal for 1-A, 36-V industrial power rails where size and EMI are constrained.
Availability
LMR43610R3RPER is available at Aetrix Electronics and suitable for factory automation field transmitters, building HVAC sensors, and cordless power tool controllers requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for LMR43610R3RPER 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 company specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive solutions.
The LMR436x0 product line was designed specifically for space-constrained, thermally demanding industrial applications - delivering ultra-low IQ, robust 42-V transient tolerance, and EMI-optimized integration in sub-4-mm² packages.
FAQ
What is the maximum input voltage the LMR43610R3RPER can withstand?
The LMR43610R3RPER supports an absolute maximum input voltage of 42 V, enabling reliable operation during industrial 24-V rail transients such as load dump or inductive kickback. Its recommended operating range is 3.0 V to 36 V, with guaranteed functionality across the full –40°C to +150°C junction temperature range. This 42-V rating is validated per TI's Absolute Maximum Ratings table and applies regardless of output load or switching frequency setting.
Does the LMR43610R3RPER require external compensation components?
No, the LMR43610R3RPER features fully internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces bill-of-materials cost, and improves production consistency. The internal compensation is optimized for use with standard 22-µF ceramic output capacitors and typical 1–2.2-µH inductors, as verified in TI's reference designs and electrical characteristics testing.
How does the RT pin on the LMR43610R3RPER set switching frequency?
The RT pin on the LMR43610R3RPER sets switching frequency by connecting an external resistor between RT and GND. A 39.2-kΩ 0.1% resistor yields ~400 kHz, while tying RT to VCC selects ~1 MHz and grounding RT selects ~2.2 MHz. Frequency accuracy is ±10% over temperature and line, and the RT pin is inactive in MODE/SYNC variants - confirming LMR43610R3RPER is the correct RT-pin variant per TI's Device Comparison Table.
What is the output voltage accuracy of the LMR43610R3RPER at full temperature range?
The LMR43610R3RPER delivers 3.3-V fixed output with ±1% accuracy (3.27 V to 3.33 V) over the full –40°C to +150°C junction temperature range and 3.6 V to 36 V input range in FPWM mode. This specification is guaranteed in TI's Electrical Characteristics table and confirmed by Figure 7-3 (Output Voltage Accuracy vs. Temperature), showing drift <±0.002 V across the entire range.
Can the LMR43610R3RPER be used in functional safety–compliant systems?
Yes, the LMR43610R3RPER is functionally safe-capable: TI provides documentation including FIT rate data, failure mode analysis, and safety application notes to support ISO 26262 and IEC 61508 system-level certification. While the device itself is not ASIL-certified, its built-in protections - thermal shutdown, PGOOD monitoring, and current limiting - provide foundational safety mechanisms usable in safety architectures when combined with appropriate system-level diagnostics.
LMR43610R3RPER 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):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V (3.3V)
- Voltage - Output (Max):
- 34.2V
- Current - Output:
- 1A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 9-VQFN-HR (2x2)
LMR43610R3RPER FAQ
1.How can I place an order for LMR43610R3RPER through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43610R3RPER 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 LMR43610R3RPER reliable?
The price and inventory of LMR43610R3RPER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43610R3RPER is usually 5 days.
3.What payment methods are accepted for LMR43610R3RPER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43610R3RPER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43610R3RPER?
LMR43610R3RPER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43610R3RPER 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 LMR43610R3RPER?
For technical support, including LMR43610R3RPER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43610R3RPER requirements.
6.How does Aetrix verify that LMR43610R3RPER is sourced from the original manufacturer or authorized distributors?
All LMR43610R3RPER 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 LMR43610R3RPER meets industry standards.
7.What is the process for return or replacement of LMR43610R3RPER?
All LMR43610R3RPER units undergo pre-shipment inspection (PSI). If there is an issue with LMR43610R3RPER, 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 LMR43610R3RPER part is unused and in its original packaging.
Return procedure for LMR43610R3RPER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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