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Texas Instruments LMR36520ADDAR
- Part No.:
- LMR36520ADDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR36520ADDAR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:4,187
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Product details
Overview
LMR36520ADDAR from Texas Instruments is a synchronous step-down DC/DC converter delivering up to 2 A output current across a 4.2 V to 65 V input range, featuring peak-current mode control, internal compensation, and 400 kHz fixed switching frequency. It integrates high-side and low-side MOSFETs (RDS(on) = 245 mΩ / 165 mΩ), supports PFM/PWM auto-mode operation, and provides power-good flag with built-in filtering-designed for rugged industrial power supplies such as IP camera and HVAC actuator systems.
For engineers reviewing the LMR36520ADDAR datasheet, LMR36520ADDAR pinout, LMR36520ADDAR application, or LMR36520ADDAR equivalent, key selection criteria include its 70 V transient tolerance, 26 µA quiescent current in non-switching mode, thermal shutdown at 170°C, precision enable thresholds (1.157 V–1.231 V), and compatibility with 8-pin HSOIC layout constraints.
Technical Context
The LMR36520ADDAR employs peak-current mode control with internal loop compensation, eliminating external compensation components and simplifying PCB layout. Its auto-mode operation dynamically transitions between PWM (constant 400 kHz) and PFM (diode-emulation at light loads) to maintain >90% efficiency at 24 VIN/5 VOUT/1 A while achieving 26 µA quiescent current.
Protection architecture includes cycle-by-cycle high-side current limit (2.4–3.6 A), low-side valley current limit (1.8–2.8 A), hiccup-mode short-circuit response (~94 ms off-time), thermal shutdown (170°C trip / 158°C recovery), and input UVLO with precision enable thresholds referenced to internal 1 V feedback reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 65 V - supports wide-VIN industrial rails including 24 V, 36 V, and 48 V systems without pre-regulation. |
| Output Current | 2 A continuous - sufficient for powering FPGA I/O banks, sensor signal chains, or dual-rail microcontrollers. |
| Switching Frequency | 400 kHz ±15% - enables compact magnetics design while maintaining EMI compliance in noise-sensitive applications. |
| Quiescent Current | 26 µA (non-switching) - extends battery life in always-on monitoring systems like security cameras. |
| Feedback Reference | 1.000 V ±15 mV - enables precise adjustable output regulation from 1 V to 95% of VIN using standard resistor dividers. |
| Power-Good Threshold | 93–95% (falling) / 105–110% (rising) of VFB - provides robust system reset signaling with 1.5% hysteresis against transient-induced false triggers. |
| Thermal Shutdown | 170°C trip / 158°C recovery - protects against sustained overload or poor heatsinking in enclosed enclosures. |
| Transient Tolerance | 70 V on VIN - meets IEC 61000-4-5 surge immunity requirements without external TVS clamping. |
Pinout & Package
The LMR36520ADDAR is housed in an 8-pin HSOIC (DDA) package measuring 4.9 mm × 6 mm, with exposed thermal pad for enhanced heat dissipation. The package uses Gull-wing leads and requires direct thermal connection of the pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 1) | Power and analog ground reference | Primary return path for high-current switching and internal references; must connect to low-impedance ground plane via short, wide traces. |
| VIN (Pin 2) | Main input supply input | Accepts 4.2–65 V; requires local high-quality bypass capacitor directly to PGND to suppress switching noise and transients. |
| EN (Pin 3) | Enable control input | Logic-level input with precision thresholds (1.157–1.231 V turn-on); can be tied directly to VIN or driven by external voltage divider for custom UVLO. |
| PG (Pin 4) | Open-drain power-good flag | Signals regulated output status; requires external pull-up resistor (to VCC or VOUT); includes built-in glitch filter and 4 ms startup delay. |
| FB (Pin 5) | Feedback voltage sense input | Monitors output via resistive divider; referenced to 1.000 V internal bandgap; must not float or be grounded. |
| VCC (Pin 6) | Internal 5 V LDO output | Supplies internal circuitry; not for external loading; requires 1 µF ceramic capacitor to PGND for stability. |
| BOOT (Pin 7) | Bootstrap supply for high-side driver | Connects 100 nF capacitor to SW pin to generate gate drive voltage above VIN for high-side MOSFET. |
| SW (Pin 8) | Switch node | Connects to power inductor; carries high di/dt switching current; requires minimum copper area and tight layout to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High/Low-Side MOSFETs | Eliminates external FETs and drivers; reduces BOM count and layout complexity while enabling 2 A output in HSOIC-8. |
| Internal Compensation | Removes need for external Type-II/III compensation network, cutting design time and component count for stable loop response. |
| Auto PFM/PWM Mode Switching | Maintains >90% efficiency across full load range: PFM at light loads (26 µA IQ) and PWM at heavy loads (400 kHz). |
| 70 V Input Transient Tolerance | Withstands IEC 61000-4-5 surges without external protection, reducing system cost and board space in industrial environments. |
| Pin Compatibility Across Family | Shares identical 8-pin HSOIC footprint with LMR36510 (1 A), LMR336x0 series (1–4 A, 36 V), enabling scalable power design reuse. |
| Thermal Pad Integration | Exposed die pad provides primary thermal path; enables 125°C continuous operation with proper PCB copper area and via stitching. |
Applications
| IP Network Cameras | Analog Security Cameras |
|---|---|
Use Scenario: Powering image sensor, ISP, and Ethernet PHY from 24 V PoE midspan or 48 V backbone rail. IC Role / Device Role / Timing Role: Primary 5 V or 3.3 V point-of-load regulator with fast transient response to handle burst-mode video processing loads. Use Value: 70 V transient tolerance prevents damage during PoE insertion/removal surges; PFM mode extends standby battery runtime. | Use Scenario: Converting unregulated 12–48 V field supply to stable 5 V/3.3 V for CCD/CMOS sensors and video DACs. IC Role / Device Role / Timing Role: Wide-input buck converter with integrated power-good signaling for system reset coordination. Use Value: Internal 1 V reference and precision EN threshold enable reliable start-up across varying input conditions; hiccup protection avoids latch-up during coaxial cable ESD events. |
| HVAC Valve & Actuator Control | AC Drive & Servo Drive Modules |
Use Scenario: Supplying 5 V logic and 12 V solenoid drivers from 24 V DC bus in building automation panels. IC Role / Device Role / Timing Role: Rugged industrial DC/DC converter with thermal shutdown and short-circuit hiccup for intermittent motor loads. Use Value: 170°C thermal shutdown prevents failure during enclosure overheating; 2 A output supports dual-rail MCU + analog front-end simultaneously. | Use Scenario: Generating isolated auxiliary rails (e.g., 15 V gate drive, 5 V logic) from main DC bus in variable-frequency drives. IC Role / Device Role / Timing Role: Non-isolated intermediate converter feeding isolated DC/DC modules or optocoupler bias supplies. Use Value: 400 kHz switching enables small, low-profile inductors; internal compensation ensures stable operation despite bus voltage ripple from IGBT switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36520FADDAR | Same 2 A rating and 400 kHz frequency, but forces PWM mode at all loads (no PFM), increasing light-load IQ to ~120 µA. | Suitable where constant switching frequency is required for EMI filtering or clock synchronization, not for battery-powered systems. | Select when deterministic frequency behavior outweighs light-load efficiency needs. |
| LMR33620ADDAR | 36 V max input (vs. 65 V), same 2 A output, identical 8-pin HSOIC package and pinout, 400 kHz frequency. | Appropriate for 12–24 V automotive or factory automation systems where 65 V capability is unnecessary. | Choose for cost-optimized designs with lower input voltage requirements and proven layout reuse. |
Compared with LMR36520FADDAR, the LMR36520ADDAR delivers superior light-load efficiency via PFM mode, while versus LMR33620ADDAR it adds critical 65 V input and 70 V surge tolerance for harsh industrial environments-making it the only option among the three that satisfies IEC 61000-4-5 Level 3 requirements without external clamping.
Availability
LMR36520ADDAR is available at Aetrix Electronics and suitable for IP network cameras, HVAC actuator control, and AC drive auxiliary power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LMR36520ADDAR 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 experience in industrial-grade DC/DC conversion.
The LMR36520ADDAR belongs to TI's SIMPLE SWITCHER® family-engineered specifically for rugged, scalable industrial power supplies where reliability, wide input range, and layout simplicity are critical design priorities.
FAQ
What is the maximum input voltage transient the LMR36520ADDAR can withstand?
The LMR36520ADDAR supports input transients up to 70 V, exceeding its 65 V absolute maximum operating voltage. This capability meets IEC 61000-4-5 surge immunity requirements for industrial equipment and eliminates the need for external TVS diodes in many applications. The 70 V rating applies to short-duration transients (<10 ns) on the VIN-to-PGND path, as specified in the Absolute Maximum Ratings table of the official datasheet.
Does the LMR36520ADDAR require external compensation components?
No, the LMR36520ADDAR features fully internal loop compensation, removing the need for external Type-II or Type-III compensation networks. This simplifies design, reduces BOM count, and improves layout robustness-especially important for high-volume industrial products where design validation time and component sourcing are critical. The internal compensation is optimized for stable operation with standard 400 kHz switching and typical output capacitor ESR values.
How does the power-good (PG) function behave during startup of the LMR36520ADDAR?
The LMR36520ADDAR's PG pin asserts high approximately 4 ms after EN is enabled, providing a delayed, filtered indication that the output has reached regulation. This built-in delay prevents false resets during initial soft-start and accommodates output capacitor charging. The PG signal remains valid down to 2 V input voltage and includes hysteresis (93–95% falling / 105–110% rising relative to VFB) to reject line/load transients shorter than tPG.
What protection features are integrated into the LMR36520ADDAR?
The LMR36520ADDAR integrates thermal shutdown (170°C trip), input undervoltage lockout (via precision EN thresholds), cycle-by-cycle high-side current limiting (2.4–3.6 A), valley-based low-side current limiting (1.8–2.8 A), hiccup-mode short-circuit protection (~94 ms off-time), and internal VCC UVLO (3.6–4.0 V). These features operate autonomously without external components, ensuring safe operation under overload, overtemperature, and input fault conditions.
Is the LMR36520ADDAR pin-compatible with other devices in the SIMPLE SWITCHER® family?
Yes, the LMR36520ADDAR uses an 8-pin HSOIC (DDA) package with identical pinout to the LMR36510 (1 A, 65 V), LMR33610, LMR33620, LMR33630, and LMR33640 (1–4 A, 36 V). This pin compatibility allows designers to scale output current and input voltage ratings without modifying PCB layout-reducing development time and qualification effort across product families targeting diverse industrial voltage domains.
LMR36520ADDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 2A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR36520ADDAR FAQ
1.How can I place an order for LMR36520ADDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36520ADDAR 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 LMR36520ADDAR reliable?
The price and inventory of LMR36520ADDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36520ADDAR is usually 5 days.
3.What payment methods are accepted for LMR36520ADDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36520ADDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36520ADDAR?
LMR36520ADDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36520ADDAR 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 LMR36520ADDAR?
For technical support, including LMR36520ADDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36520ADDAR requirements.
6.How does Aetrix verify that LMR36520ADDAR is sourced from the original manufacturer or authorized distributors?
All LMR36520ADDAR 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 LMR36520ADDAR meets industry standards.
7.What is the process for return or replacement of LMR36520ADDAR?
All LMR36520ADDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR36520ADDAR, 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 LMR36520ADDAR part is unused and in its original packaging.
Return procedure for LMR36520ADDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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