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Texas Instruments LMR43610MB3RPER
- Part No.:
- LMR43610MB3RPER
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43610MB3RPER.pdf
- Description:
- IC REG BUCK ADJ/1V 1A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,948
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Product details
Overview
LMR43610MB3RPER from Texas Instruments is a 36-V, 1-A synchronous step-down DC/DC converter in a 2-mm × 2-mm HotRod™ QFN package with wettable flanks. It delivers fixed 3.3-V output, supports 3.0–36-V input, withstands 42-V transients, operates from –40°C to +150°C, and achieves 1.2–2.2 µA non-switching IQ at 24-V IN. It serves as a compact, low-EMI power supply for field transmitters and process sensors.
For engineers reviewing the LMR43610MB3RPER datasheet, LMR43610MB3RPER pinout, LMR43610MB3RPER application, or LMR43610MB3RPER equivalent, this page provides verified functional safety-capable buck converter specifications, MODE/SYNC-controlled FPWM/Auto mode operation, thermal shutdown at 158–186°C, 9-pin VQFN-HR package layout, and direct alternatives for industrial 3.3-V rail generation.
Technical Context
The LMR43610MB3RPER uses peak current mode control with internal compensation and dual random spread spectrum to minimize output capacitance and EMI. Its MODE/SYNC pin enables user-selectable PFM/FPWM operation or external clock synchronization between 0.2–2.5 MHz while maintaining regulation during frequency foldback.
It integrates high-side (132–260 mΩ) and low-side (75–140 mΩ) MOSFETs, features precision enable thresholds (VEN-WAKE = 0.5–1 V, VEN-VOUT = 1.16–1.3 V), and includes PGOOD with 2.4% hysteresis and 2.5-ms activation delay. Thermal shutdown triggers at 158–186°C with 15–20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous DC output - supports full-load operation in space-constrained industrial sensors. |
| Input Voltage Range | 3.0 V to 36 V - accommodates wide-input systems including 24-V industrial buses with 42-V transient tolerance. |
| Output Voltage | Fixed 3.3 V ±1% - eliminates external feedback resistors and simplifies BOM for standard logic rails. |
| Quiescent Current | 1.2–2.2 µA at VIN = 13.5 V - enables ultra-low-power operation in battery-backed or energy-harvesting applications. |
| Switching Frequency | Fixed 1 MHz - ensures predictable EMI profile and avoids AM band interference without external RT resistor. |
| Junction Temperature | –40°C to +150°C - rated for harsh environments such as factory automation enclosures and HVAC control units. |
| Package | 2-mm × 2-mm VQFN-HR (RPE) with wettable flanks - enables automated optical inspection and robust solder joint reliability. |
Pinout & Package
LMR43610MB3RPER is housed in a 9-pin, 2.00 mm × 2.00 mm VQFN-HR (RPE) package with wettable flanks and corner anchor pins for enhanced solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE/SYNC | Mode selection / sync input | Configures PFM/FPWM operation or accepts external 0.2–2.5 MHz clock; must not be floated. |
| 2 PGOOD | Open-drain power-good flag | Signals regulation status with 2.5-ms delay and 2.4% hysteresis; compatible with microcontroller reset inputs. |
| 3 EN/UVLO | Enable / undervoltage lockout | Starts switching when voltage exceeds 1.16–1.3 V; shuts down below 0.5–1 V; supports direct VIN connection. |
| 4 VIN | Main input supply | Accepts 3.0–36 V with 42-V transient rating; requires local high-quality bypass capacitor. |
| 5 SW | Switch node | Connects to power inductor; carries high di/dt; critical for EMI-sensitive PCB layout. |
| 6 BOOT | Bootstrap supply | Drives high-side MOSFET gate via 100-nF capacitor to SW; determines high-side conduction capability. |
| 7 VCC | Internal LDO output | Supplies internal control circuitry at 3.1–3.45 V; not for external loading; requires 1-µF decoupling. |
| 8 VOUT/FB | Output voltage sense / feedback | Directly connects to 3.3-V output node; sets regulation point without external divider for fixed-VOUT variants. |
| 9 GND | Power ground | Primary return path; must connect to CIN with short, wide traces to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety-Capable | Documentation available for ISO 26262 and IEC 61508 system-level safety design integration. |
| Ultra-Low EMI Architecture | Dual random spread spectrum + optimized pinout + HotRod™ package reduce conducted and radiated emissions without filters. |
| Pin-Selectable FPWM Mode | Enables constant-frequency operation at light loads via MODE/SYNC pin-critical for noise-sensitive analog signal chains. |
| Integrated Power Stage | High-side (132–260 mΩ) and low-side (75–140 mΩ) MOSFETs eliminate external FETs and drivers, reducing solution size to 10 mm × 10 mm. |
| Thermal Robustness | 150°C maximum junction temperature and thermal shutdown with 15–20°C hysteresis ensure reliable operation in sealed enclosures. |
Applications
| Factory Automation Sensors | Building HVAC Controllers |
|---|---|
Use Scenario: Powering 4–20 mA field transmitters in explosion-proof enclosures with ambient temperatures up to 70°C and 24-V DC supply. IC Role / Device Role / Timing Role: Primary 3.3-V bias rail generator with ultra-low IQ to extend loop-powered sensor lifetime and maintain accuracy across temperature. Use Value: 1.2 µA quiescent current at 24-V input enables >10-year battery life in backup configurations; 150°C TJMAX rating prevents thermal derating in confined spaces. | Use Scenario: Supplying microcontroller, ADC, and wireless transceiver in wall-mounted thermostats exposed to seasonal ambient swings from –20°C to +60°C. IC Role / Device Role / Timing Role: Compact, fixed 3.3-V regulator delivering stable power despite input ripple from HVAC motor drives and line transients. Use Value: 42-V transient support prevents brownouts during compressor startup; 2-mm × 2-mm package fits within tight front-panel PCB real estate. |
| Industrial Fire Safety Detectors | Garden Power Tool Control Boards |
Use Scenario: Providing regulated 3.3-V supply to smoke/CO sensing ICs and RS-485 communication in ceiling-mounted fire alarm nodes. IC Role / Device Role / Timing Role: Safety-critical power stage with PGOOD monitoring and thermal shutdown to ensure fail-safe behavior during overtemperature events. Use Value: Functional safety documentation enables compliance with UL 864 and EN 54-4; PGOOD hysteresis prevents false resets during brief load transients. | Use Scenario: Powering motor control MCU and gate drivers in cordless drill battery packs with 10–18-V nominal Li-ion input. IC Role / Device Role / Timing Role: Efficient step-down converter supporting wide input range (10–18 V) and delivering clean 3.3-V logic rail during high-current motor bursts. Use Value: Greater than 85% efficiency at 1 mA enables low-power sleep modes; FPWM mode maintains clock stability during variable-speed motor control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR43610R3RPER | Same 1-A, 3.3-V fixed output but uses RT pin for adjustable 200 kHz–2.2 MHz FSW instead of MODE/SYNC pin. | Preferred where programmable frequency tuning is required to avoid noise bands or match system clocks. | Select LMR43610R3RPER if frequency flexibility outweighs need for external sync or FPWM mode selection. |
| LMR36503RDRR | 65-V, 300-mA buck with similar 2-mm × 2-mm HotRod™ package but lower current and higher max input voltage. | Suitable for lower-power auxiliary rails where 300-mA output suffices and 65-V input margin is needed. | Choose LMR36503RDRR only when input voltage may exceed 36 V or output current demand is ≤300 mA. |
Compared with LMR43610R3RPER, LMR43610MB3RPER offers immediate 1-MHz operation without resistor selection and integrated FPWM mode control-reducing design iterations for fixed-frequency EMI-sensitive systems. Against LMR36503RDRR, it delivers triple the output current and tighter 3.3-V accuracy but sacrifices 65-V input capability.
Availability
LMR43610MB3RPER is available at Aetrix Electronics and suitable for factory automation sensors, building HVAC controllers, and industrial fire safety detectors requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LMR43610MB3RPER 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LMR436x0 product line was designed specifically for space-constrained, thermally demanding industrial power supplies-emphasizing ultra-small footprint, low IQ, functional safety readiness, and robust 150°C operation.
FAQ
What is the maximum input voltage transient rating for LMR43610MB3RPER?
The LMR43610MB3RPER supports 42-V input transients, as specified in its Absolute Maximum Ratings table. This allows safe operation during load dump events or inductive kickback in industrial 24-V systems without external protection circuitry. The device maintains regulation throughout the transient if duration remains within thermal limits, and its internal protection features remain active at all times.
Does LMR43610MB3RPER require external compensation components?
No, LMR43610MB3RPER uses internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This reduces bill-of-materials count and PCB area while ensuring stable operation across the full 3.0–36-V input range and 0–1-A load range. Designers only need to select appropriate input/output capacitors and the power inductor per the datasheet guidelines.
How does the MODE/SYNC pin function in LMR43610MB3RPER?
In LMR43610MB3RPER, the MODE/SYNC pin selects between Auto (PFM), FPWM, or external synchronization modes. Applying >1.6 V sets FPWM; <1 V selects Auto; and a 0.2–2.5 MHz clock signal enables SYNC mode. The pin must never be left floating and controls both light-load behavior and EMI profile-enabling constant-frequency operation where needed.
What is the thermal shutdown threshold for LMR43610MB3RPER?
The LMR43610MB3RPER thermal shutdown trips between 158°C and 186°C, with recovery hysteresis of 15–20°C. This protects the device during sustained overload or poor heatsinking conditions. The shutdown is implemented via on-die thermal sensing and forces the regulator into a non-switching state until junction temperature falls below the recovery threshold, after which soft-start resumes automatically.
Can LMR43610MB3RPER be used with a 3.0-V minimum input voltage?
Yes, LMR43610MB3RPER supports a minimum input voltage of 3.0 V after startup and 3.6 V for initial start-up, enabling compatibility with single-cell Li-ion (3.0–4.2 V) and 3.3-V system rails. At 3.0-V input, the device regulates 3.3-V output with ≥95% duty cycle and reduced maximum output current due to dropout constraints-verified in the datasheet's system characteristics section.
LMR43610MB3RPER 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:
- 1MHz
- 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)
LMR43610MB3RPER FAQ
1.How can I place an order for LMR43610MB3RPER through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43610MB3RPER 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 LMR43610MB3RPER reliable?
The price and inventory of LMR43610MB3RPER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43610MB3RPER is usually 5 days.
3.What payment methods are accepted for LMR43610MB3RPER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43610MB3RPER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43610MB3RPER?
LMR43610MB3RPER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43610MB3RPER 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 LMR43610MB3RPER?
For technical support, including LMR43610MB3RPER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43610MB3RPER requirements.
6.How does Aetrix verify that LMR43610MB3RPER is sourced from the original manufacturer or authorized distributors?
All LMR43610MB3RPER 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 LMR43610MB3RPER meets industry standards.
7.What is the process for return or replacement of LMR43610MB3RPER?
All LMR43610MB3RPER units undergo pre-shipment inspection (PSI). If there is an issue with LMR43610MB3RPER, 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 LMR43610MB3RPER part is unused and in its original packaging.
Return procedure for LMR43610MB3RPER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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