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Texas Instruments LMR43620R5RPER
- Part No.:
- LMR43620R5RPER
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR43620R5RPER.pdf
- Description:
- IC REG BUCK ADJ/5V 2A 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,655
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Product details
Overview
LMR43620R5RPER 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 adjustable switching frequency (200 kHz–2.2 MHz via RT pin), 5-V fixed output, and ultra-low 1.3-µA quiescent current at 24-VIN/5-VOUT. It delivers >85% efficiency at 1-mA load and supports 42-V input transients-ideal for space-constrained industrial power rails.
For engineers reviewing the LMR43620R5RPER datasheet, LMR43620R5RPER pinout, LMR43620R5RPER application, or LMR43620R5RPER equivalent, key selection considerations include its RT-pin-based frequency tuning, PFM-only light-load operation (no MODE/SYNC pin), thermal robustness to +150°CTJ, and compatibility with compact 10-mm² PCB layouts in field transmitters and HVAC controllers.
Technical Context
The LMR43620R5RPER uses peak current mode control with internal compensation to minimize external components and output capacitance. Its dual random spread spectrum and optimized HotRod™ pinout reduce EMI without requiring complex filtering.
This RT variant lacks MODE/SYNC functionality-frequency is set solely by an external resistor on the RT pin, enabling precise noise-band avoidance between 200 kHz and 2.2 MHz. It operates exclusively in auto (PFM) mode at light loads, eliminating reverse inductor current and minimizing standby power.
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 unregulated 24-V industrial rails) |
| Output Current | 2 A continuous (sustains full load up to +150°C junction temperature) |
| Quiescent Current | 1.3 µA at 24-VIN/5-VOUT (enables >1-year battery life in always-on sensor nodes) |
| Switching Frequency | 200 kHz to 2.2 MHz (externally adjustable via RT pin-avoids AM band and enables layout optimization) |
| Output Voltage | 5-V fixed (±1% accuracy over –40°C to +150°C-eliminates feedback resistor network) |
| Package | RPE (9-pin VQFN-HR, 2.0 mm × 2.0 mm with wettable flanks-supports automated optical inspection and high-reliability solder joints) |
| Thermal Limit | +150°C maximum junction temperature (rated for harsh industrial environments without derating) |
Pinout & Package
RPE package: 9-pin VQFN-HR (2.0 mm × 2.0 mm), exposed thermal pad, wettable flanks, corner anchor pins for mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RT | Frequency setting input | Connects to resistor-to-GND to set switching frequency from 200 kHz to 2.2 MHz-no external clock required |
| 2 - PGOOD | Open-drain power-good flag | Signals valid regulation (104–111% of target); requires pull-up-replaces external reset supervisor IC |
| 3 - EN/UVLO | Enable and undervoltage lockout input | Active-high enable with precision thresholds (0.7-V wake, 1.23-V turn-on)-supports direct VIN tie or microcontroller control |
| 4 - VIN | Main input supply | Accepts 3.0–36-V input; handles 42-V transients-bypass capacitor must be placed directly to GND |
| 5 - SW | Switch node | Connects to power inductor; carries high di/dt-requires short, low-inductance trace routing |
| 6 - BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100-nF ceramic capacitor to SW-critical for reliable high-side conduction |
| 7 - VCC | Internal LDO output | 3.3-V internal supply for control circuitry; decoupled with 1-µF capacitor-no external loading permitted |
| 8 - VOUT/FB | Output voltage sense / feedback | 5-V fixed output-connect directly to output rail; no external resistors needed |
| 9 - GND | Power ground | Primary return path for high-current loops; must connect to CIN with wide, low-inductance trace |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 1.3 µA at 24-VIN/5-VOUT enables multi-year operation in battery-powered field sensors |
| Miniature footprint | 2-mm × 2-mm HotRod™ QFN reduces solution size to <10 mm²-fits inside tight enclosures |
| High-temp operation | +150°C max junction rating allows placement near heat sources without derating |
| Integrated protection | Thermal shutdown (168°C trip), hiccup-mode overload recovery, and input UVLO prevent system failure |
| Low-EMI design | Dual random spread spectrum + optimized pinout meets CISPR-22 Class B without shielding |
Applications
| Factory Automation: Field Transmitters | Building Automation: HVAC Controllers |
|---|---|
Use Scenario: 4–20-mA loop-powered pressure/temperature transmitter operating in hazardous zones with limited board area. IC Role / Device Role / Timing Role: Primary 5-V bias rail generator from 24-V loop supply, delivering 2-A peak during sensor sampling bursts. Use Value: 1.3-µA IQ extends battery backup runtime; 2-mm × 2-mm package fits within DIN-rail module height constraints. |
Use Scenario: Smart thermostat with wireless connectivity, requiring stable 5-V rail for MCU, RF, and display under variable ambient temperatures. IC Role / Device Role / Timing Role: Main system regulator converting 24-VAC-derived DC to clean 5-V supply with minimal thermal rise. Use Value: +150°C TJMAX rating ensures reliability in sealed enclosures; PGOOD eliminates need for discrete reset IC. |
| Appliances: Cordless Power Tools | Industrial IoT: Edge Sensor Nodes |
Use Scenario: Brushless motor controller board where space and thermal management are critical during burst-mode operation. IC Role / Device Role / Timing Role: Auxiliary 5-V rail for gate drivers and logic, powered from main 18–36-V battery pack. Use Value: 42-V transient tolerance withstands motor back-EMF spikes; 2-A capability supports simultaneous MCU and communication ICs. |
Use Scenario: Wireless vibration sensor node deployed in factory machinery, powered by energy harvesting or long-life Li-SOCl₂ battery. IC Role / Device Role / Timing Role: Ultra-low-power 5-V regulator enabling deep-sleep MCU operation with periodic wake-up bursts. Use Value: 1.3-µA IQ enables >5-year battery life; RT-pin frequency tuning avoids interference with 2.4-GHz BLE radio. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR43620MB5RPER | Includes MODE/SYNC pin for FPWM/external sync; fixed 1-MHz FSW; same 5-V fixed output and 2-A rating | Required when system-level clock synchronization or constant-frequency light-load operation is needed | Select MB5RPER if PFM-to-FPWM transition must be controlled or if multiple converters require synchronized switching |
| LMR36506RGER | 65-V input, 600-mA output, pin-compatible 2-mm × 2-mm HotRod™ package; supports 3.3-V/5-V fixed outputs | Suitable for higher-input-voltage systems (e.g., 48-V industrial buses) with lower current demands | Select RGER only if input exceeds 36 V or output current ≤600 mA-trade-off is reduced current capability |
Compared with LMR43620MB5RPER, the LMR43620R5RPER sacrifices sync capability for simpler design and lower cost in PFM-only applications; versus LMR36506RGER, it trades higher input voltage range for double the output current at 36-V max-making it optimal for 24-V industrial rails demanding 2-A sustained delivery.
Availability
LMR43620R5RPER is available at Aetrix Electronics and suitable for factory automation, building HVAC controls, and cordless power tools requiring stable component supply, extended temperature operation, and compact power conversion.
Supply support for LMR43620R5RPER 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 and embedded processing technologies, with decades of expertise in high-reliability power management ICs.
The LMR436x0 product line was designed specifically for space- and thermally constrained industrial applications-including field transmitters, PLC I/O modules, and smart sensors-where ultra-low IQ, small footprint, and 150°C operation are mandatory.
FAQ
What is the maximum input voltage the LMR43620R5RPER can handle?
The LMR43620R5RPER supports a continuous input voltage range of 3.0 V to 36 V, with absolute maximum rating of 42 V for transient conditions. This allows direct integration into 24-V industrial systems subject to load-dump or inductive kick events without external clamping circuitry. The device maintains regulation throughout this range when configured for 5-V fixed output.
Does the LMR43620R5RPER support external frequency synchronization?
No, the LMR43620R5RPER does not support external synchronization. It is an RT-pin variant-switching frequency is set exclusively by an external resistor connected between the RT pin and GND, adjustable from 200 kHz to 2.2 MHz. For sync capability, select the MODE/SYNC variant LMR43620MB5RPER instead.
What is the output voltage accuracy of the LMR43620R5RPER over temperature?
The LMR43620R5RPER provides 5-V fixed output with ±1% accuracy (4.94 V to 5.06 V) over the full –40°C to +150°C junction temperature range in FPWM mode. This tight regulation eliminates the need for post-regulation LDOs in most industrial applications and ensures consistent MCU and sensor performance across extreme ambient conditions.
How does the LMR43620R5RPER manage thermal performance in enclosed environments?
The LMR43620R5RPER is rated for +150°C maximum junction temperature and features a thermally enhanced RPE package with exposed pad. Its 84.4°C/W junction-to-ambient thermal resistance (on standard 4-layer PCB) enables full 2-A output in compact layouts. Thermal shutdown activates at 168°C with 20°C hysteresis, ensuring safe recovery without system interruption.
Can the LMR43620R5RPER operate with only ceramic output capacitors?
Yes, the LMR43620R5RPER is internally compensated and optimized for use with low-ESR ceramic output capacitors only-no electrolytic or tantalum capacitors required. Its peak current mode architecture stabilizes with typical 10–22-µF X7R/X5R ceramics, reducing solution size, improving reliability, and eliminating aging-related drift common in wet electrolytics.
LMR43620R5RPER 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:
- 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)
LMR43620R5RPER FAQ
1.How can I place an order for LMR43620R5RPER through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR43620R5RPER 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 LMR43620R5RPER reliable?
The price and inventory of LMR43620R5RPER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR43620R5RPER is usually 5 days.
3.What payment methods are accepted for LMR43620R5RPER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR43620R5RPER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR43620R5RPER?
LMR43620R5RPER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR43620R5RPER 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 LMR43620R5RPER?
For technical support, including LMR43620R5RPER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR43620R5RPER requirements.
6.How does Aetrix verify that LMR43620R5RPER is sourced from the original manufacturer or authorized distributors?
All LMR43620R5RPER 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 LMR43620R5RPER meets industry standards.
7.What is the process for return or replacement of LMR43620R5RPER?
All LMR43620R5RPER units undergo pre-shipment inspection (PSI). If there is an issue with LMR43620R5RPER, 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 LMR43620R5RPER part is unused and in its original packaging.
Return procedure for LMR43620R5RPER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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