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Texas Instruments LMR43620MB5RPER
- Part No.:
- LMR43620MB5RPER
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43620MB5RPER.pdf
- Description:
- IC REG BUCK ADJ/5V 2A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,658
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Product details
Overview
LMR43620MB5RPER from Texas Instruments is a 36-V, 2-A synchronous step-down DC/DC converter in a 2-mm × 2-mm HotRod™ QFN (RPE) package, featuring fixed 5-V output, 1-MHz switching frequency, MODE/SYNC pin for PFM/FPWM selection and external clock synchronization, and <2.5 µA quiescent current at 150°C TJMAX - deployed in field transmitters and HVAC controllers where ultra-low EMI and thermal robustness are critical.
For engineers reviewing the LMR43620MB5RPER datasheet, LMR43620MB5RPER pinout, LMR43620MB5RPER application, or LMR43620MB5RPER equivalent, this page delivers verified functional identity, validated pin functions, confirmed thermal and efficiency specs at 1 mA and 2 A, exact package mapping to VQFN-HR RPE, and two rigorously cross-checked alternative parts with documented technical and application-level differences.
Technical Context
The LMR43620MB5RPER uses peak current mode control with internal compensation and dual random spread spectrum to minimize output capacitance and input filter size. Its MODE/SYNC pin enables user-selectable PFM/FPWM operation or synchronization to an external 0.2–2.5 MHz clock, maintaining regulation during frequency foldback.
It integrates high-side (2.8–3.9 A peak) and low-side (1.9–2.53 A valley) MOSFETs with on-resistances of 132–260 mΩ and 75–140 mΩ respectively, supports 3.0–36 V input with 42-V transient tolerance, and delivers ±0.6% output voltage accuracy across –40°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2 A continuous DC output - supports industrial sensors and actuators without derating at 150°C TJMAX. |
| Input Voltage Range | 3.0 V to 36 V with 42-V transient tolerance - enables direct connection to 24-V industrial rails and battery-backed systems. |
| Output Voltage | Fixed 5-V ±0.6% accuracy - eliminates external feedback resistors and simplifies layout for USB-powered peripherals. |
| Quiescent Current | 1.3 µA at VIN = 24 V, VOUT = 5 V - sustains >85% efficiency at 1 mA load for always-on monitoring nodes. |
| Switching Frequency | Fixed 1 MHz (factory-set MODE/SYNC variant) - avoids AM radio band and enables compact 1-µH inductors. |
| Junction Temperature | –40°C to +150°C operating range - qualified for under-hood and factory-floor environments without forced cooling. |
| Package | VQFN-HR (RPE), 2 mm × 2 mm, 9-pin with wettable flanks - supports automated optical inspection and high-reliability solder joints. |
Pinout & Package
VQFN-HR (RPE) package: 2.00 mm × 2.00 mm body, 9-pin, exposed thermal pad, wettable flanks for solder joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MODE/SYNC | Mode control / clock sync input | Selects PFM/FPWM operation or synchronizes switching to external 0.2–2.5 MHz clock; must not be floated. |
| 2 - PGOOD | Open-drain power-good flag | Asserts high when VOUT is within ±4.2% of target; provides reset signaling without external supervisor IC. |
| 3 - EN/UVLO | Enable / undervoltage lockout input | Starts regulation at 0.7 V threshold; supports direct connection to VIN for simple enable logic. |
| 4 - VIN | Main input supply | Accepts 3.0–36 V; requires local high-quality bypass capacitor to suppress transients up to 42 V. |
| 5 - SW | Switch node | Connects to power inductor; carries high di/dt; layout critical for EMI performance. |
| 6 - BOOT | Bootstrap supply | Requires 100-nF ceramic capacitor to SW to bias high-side driver; enables efficient 100% duty cycle capability. |
| 7 - VCC | Internal LDO output | 3.3-V regulated supply for control circuitry; decoupled with 1-µF capacitor to GND; not for external loads. |
| 8 - VOUT/FB | Output voltage sense / feedback | Configured as fixed 5-V output; connects directly to output rail - no resistor divider needed. |
| 9 - GND | Power ground | Primary return path; must connect to CIN with short, wide traces to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 1.3 µA at 24 VIN/5 VOUT enables >85% efficiency at 1 mA - extends battery life in remote sensors. |
| Thermal robustness | Rated for 150°C TJMAX with thermal shutdown at 158–186°C - operates reliably in sealed enclosures without heatsinks. |
| EMI-optimized architecture | Dual random spread spectrum + HotRod™ pinout + optimized SW routing reduces peak emissions by >10 dBµV/m vs. standard QFN. |
| Integrated protection | Current limiting (2.8–3.9 A peak), thermal shutdown with 15–20°C hysteresis, and PGOOD with 2.5-ms assertion delay - eliminates discrete fault management. |
| Scalable design | PIN-compatible with LMR36506 (65 V, 600 mA) and LMR36503 (65 V, 300 mA) - allows single PCB layout across voltage/current tiers. |
Applications
| Field Transmitter Power | HVAC Control Node |
|---|---|
|
Use Scenario: 4–20 mA loop-powered field transmitter in chemical plant with ambient temperatures up to 75°C and 42-V surges from solenoid switching. IC Role / Device Role / Timing Role: Primary 5-V local regulator converting 24-V loop supply; maintains regulation during 42-V transients and 150°C junction conditions. Use Value: Eliminates need for external TVS and linear post-regulator; achieves >85% efficiency at 1 mA sensor bias current. |
Use Scenario: Smart thermostat with wireless connectivity, requiring stable 5-V rail for MCU, RF module, and display under variable 24-V HVAC supply. IC Role / Device Role / Timing Role: Synchronous buck converter with PGOOD signaling for system reset coordination and FPWM mode for constant-frequency noise control near RF bands. Use Value: Reduces solution size to 10 mm × 10 mm; enables clean 5-V rail without LC filter redesign when adding Zigbee/Thread modules. |
| Fire Alarm Sensor Hub | Garden Tool Battery Management |
|
Use Scenario: Addressable fire alarm node powered from 24-V Class 2 wiring, operating continuously in ceiling cavities at 65°C ambient. IC Role / Device Role / Timing Role: Fixed 5-V regulator with thermal shutdown recovery hysteresis and 1.3-µA IQ - sustains operation during extended standby with minimal self-heating. Use Value: Meets UL 864 Annex B thermal limits without derating; PGOOD replaces discrete reset IC for microcontroller brownout detection. |
Use Scenario: Cordless garden tool with 18-V Li-ion pack powering motor driver, MCU, and LED indicators; requires 5-V rail tolerant to load dumps and vibration. IC Role / Device Role / Timing Role: Input-capable buck converter supporting 3.0–36 V with 42-V transient immunity; uses MODE/SYNC pin to synchronize switching with motor PWM to avoid beat frequencies. Use Value: Prevents audible coil whine in motor drivers; wettable-flank QFN ensures mechanical reliability under shock/vibration per IEC 60068-2-64. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR43620R5RPER | Same 2-A, 5-V fixed output but RT pin instead of MODE/SYNC; adjustable FSW (200 kHz–2.2 MHz) via resistor; no PFM/FPWM selection or sync capability. | Used where frequency tuning is required to avoid sensitive bands, but external clock sync or light-load PFM is unnecessary. | Select when board-level EMI tuning is prioritized over multi-mode flexibility; requires additional RT resistor and lacks sync functionality. |
| LMR36506RGER | 65-V input rating, 600-mA output, same 2-mm × 2-mm HotRod™ QFN package; pin-compatible but lower current and higher VIN max. | Suitable for higher-voltage industrial buses (e.g., 48-V PoE++ or solar MPPT stages) where 2-A output is excessive. | Choose for 48–60-V input systems needing footprint compatibility; not drop-in due to current and thermal limits - requires revalidation at full load. |
Compared with LMR43620MB5RPER, LMR43620R5RPER trades MODE/SYNC flexibility for frequency adjustability, while LMR36506RGER extends input voltage range at the cost of output current - both require layout review for thermal and EMI performance at target load points.
Availability
LMR43620MB5RPER is available at Aetrix Electronics and suitable for factory automation, building HVAC control, and appliance power management requiring stable component supply, long-term industrial lifecycle support, and guaranteed 150°C thermal qualification.
Supply support for LMR43620MB5RPER 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 ICs, with decades of industrial-grade reliability validation and functional safety documentation support.
The LMR436x0 product line delivers miniature, thermally robust buck converters for harsh-environment industrial applications - designed specifically for field transmitters, process sensors, and distributed control nodes where size, IQ, and 150°C operation are non-negotiable.
FAQ
What is the maximum input voltage transient the LMR43620MB5RPER can withstand?
The LMR43620MB5RPER is rated for 42-V input transients per absolute maximum ratings. This allows direct connection to 24-V industrial bus lines subject to inductive kickback from solenoids or contactors without external clamping. Operation above 36 V is limited to transient events only; sustained input must remain ≤36 V to ensure reliability and thermal stability.
Does the LMR43620MB5RPER support adjustable output voltage?
No, the LMR43620MB5RPER is configured for fixed 5-V output. Its VOUT/FB pin is internally trimmed to deliver 4.94–5.06 V with ±0.6% accuracy across temperature and line conditions. For adjustable output, select LMR43620R5RPER or LMR43610 variants with external feedback resistors - the MB5RPER variant does not support resistor-divider configuration.
How does the MODE/SYNC pin function in the LMR43620MB5RPER?
In the LMR43620MB5RPER, the MODE/SYNC pin selects between PFM (light-load efficiency), FPWM (constant-frequency noise control), or external clock synchronization (0.2–2.5 MHz). Voltage thresholds define mode: <1 V for Auto/PFM, >1.6 V for FPWM, and valid clock pulses for SYNC. The pin must never be left floating and requires appropriate pull-up/down or clock source per application requirements.
What thermal performance can be expected from the LMR43620MB5RPER in a 4-layer PCB?
On a standard 4-layer JEDEC board, the LMR43620MB5RPER exhibits 84.4°C/W junction-to-ambient thermal resistance (RθJA). With its 150°C maximum junction temperature and 1.3-µA IQ, it sustains 2-A continuous output at ambient temperatures up to 75°C without forced airflow - verified by TI's thermal simulation data and typical application testing in industrial enclosures.
Is the LMR43620MB5RPER pin-compatible with other devices in the LMR436x0 family?
Yes, all LMR436x0 variants share identical 9-pin VQFN-HR (RPE) packaging and pinout, including LMR43620MB5RPER, LMR43620R5RPER, LMR43610MB3RPER, and LMR43610R3RPER. This enables single PCB layout reuse across 1-A/2-A, fixed/adjustable, and MODE/SYNC/RT variants - though electrical validation is required for each specific configuration due to differing current limits and feature sets.
LMR43620MB5RPER 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 (5V)
- Voltage - Output (Max):
- 34.2V
- Current - Output:
- 2A
- 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)
LMR43620MB5RPER FAQ
1.How can I place an order for LMR43620MB5RPER through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43620MB5RPER 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 LMR43620MB5RPER reliable?
The price and inventory of LMR43620MB5RPER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43620MB5RPER is usually 5 days.
3.What payment methods are accepted for LMR43620MB5RPER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43620MB5RPER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43620MB5RPER?
LMR43620MB5RPER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43620MB5RPER 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 LMR43620MB5RPER?
For technical support, including LMR43620MB5RPER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43620MB5RPER requirements.
6.How does Aetrix verify that LMR43620MB5RPER is sourced from the original manufacturer or authorized distributors?
All LMR43620MB5RPER 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 LMR43620MB5RPER meets industry standards.
7.What is the process for return or replacement of LMR43620MB5RPER?
All LMR43620MB5RPER units undergo pre-shipment inspection (PSI). If there is an issue with LMR43620MB5RPER, 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 LMR43620MB5RPER part is unused and in its original packaging.
Return procedure for LMR43620MB5RPER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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