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Texas Instruments LMR36520FADDAR
- Part No.:
- LMR36520FADDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR36520FADDAR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,197
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Product details
Overview
LMR36520FADDAR from Texas Instruments is a 4.2V to 65V input, 2A synchronous step-down DC/DC converter in an 8-pin HSOIC package, featuring forced PWM (FPWM) operation at 400 kHz, 26 µA quiescent current, and integrated high-side/low-side MOSFETs. It delivers regulated output voltages from 1V to 95% of VIN and is designed for rugged industrial power supplies such as HVAC actuators and IP camera power rails.
For engineers reviewing the LMR36520FADDAR datasheet, LMR36520FADDAR pinout, LMR36520FADDAR application, or LMR36520FADDAR equivalent, key selection criteria include FPWM mode guaranteeing constant 400 kHz switching across all loads, 70V input transient tolerance, internal compensation eliminating external loop components, and compatibility with LMR36510 and LMR336x0 family members for scalable design reuse.
Technical Context
The LMR36520FADDAR uses peak-current mode control with forced PWM (FPWM) operation-disabling diode emulation to maintain continuous conduction mode (CCM) even at light loads. Its internal 5-V VCC LDO powers control circuitry, while precision enable thresholds (VEN-H = 1.231 V, VEN-L = 0.3 V) support direct VIN connection or adjustable UVLO.
It integrates high-side (RDS(on) = 465 mΩ max) and low-side (RDS(on) = 310 mΩ max) MOSFETs, supports 98% maximum duty cycle, and features hiccup-mode short-circuit protection triggered by FB voltage falling below 0.4 V. Thermal shutdown activates at 170°C with 12°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 65 V - supports wide industrial bus rails including 24 V, 36 V, and 48 V systems with 70 V transient tolerance. |
| Output Current | 2 A continuous - sufficient for powering dual-rail microcontrollers, analog I/O modules, or camera image sensors. |
| Switching Frequency | 400 kHz fixed (FPWM) - enables predictable EMI filtering and eliminates frequency variation during load transients. |
| Quiescent Current | 26 µA - minimizes standby power loss in always-on industrial equipment without sacrificing startup responsiveness. |
| Feedback Reference | 1.0 V ±15 mV - enables precise output regulation with standard resistor-divider networks and stable loop response. |
| Power-Good Threshold | 93–95% (falling), 105–110% (rising) of VFB - provides robust system reset signaling with built-in glitch filtering and 4 ms startup delay. |
| Thermal Shutdown | 170°C activation / 158°C recovery - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
The LMR36520FADDAR is housed in an 8-pin HSOIC (DDA) package measuring 4.9 mm × 6 mm, with an exposed thermal pad requiring direct connection to a PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1) | Power and analog ground reference | Primary return path for high-current switching and internal references; must be connected to bypass capacitor with short, wide traces. |
| VIN (2) | Main input supply | Accepts 4.2–65 V; requires local high-quality ceramic capacitor directly to PGND to suppress high-frequency ripple and transients. |
| EN (3) | Enable control input | Logic-level input (1.231 V threshold); supports direct VIN tie or external divider for programmable UVLO; must not float. |
| PG (4) | Open-drain power-good flag | Signals VOUT regulation status; requires external pull-up (to VCC or VOUT); asserts low during fault, startup, or EN deactivation. |
| FB (5) | Feedback voltage sensing | Monitors resistive divider output; sets VOUT = 1.0 V × (1 + RFBT/RFBB); high-impedance node requiring clean routing. |
| VCC (6) | Internal 5-V LDO output | Supplies internal logic; not for external loading; requires 1-µF ceramic capacitor to PGND for stability. |
| BOOT (7) | High-side gate driver bootstrap | Connects via 100-nF capacitor to SW; critical for proper high-side MOSFET turn-on; sensitive to layout parasitics. |
| SW (8) | Switch node | Connects to power inductor; carries high dv/dt and high peak currents; requires minimized trace area and tight coupling to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Forced PWM (FPWM) mode | Guarantees constant 400 kHz switching regardless of load-eliminates audible noise and simplifies EMI compliance testing. |
| 70 V input transient tolerance | Meets IEC 61000-4-5 surge immunity requirements without external TVS clamping, reducing BOM count and board space. |
| Internal compensation | Removes need for external Type-II/III compensation network-reduces design iterations, component count, and layout sensitivity. |
| Hiccup-mode short-circuit protection | Limits junction temperature rise during hard shorts by cycling 94 ms off / ~20 ms on-enables safe operation without thermal runaway. |
| Integrated 5-V VCC LDO | Self-powered control circuitry eliminates need for auxiliary bias supply-simplifies system architecture and improves reliability. |
Applications
| IP Network Cameras | Analog Security Cameras |
|---|---|
|
Use Scenario: Powering CMOS image sensor, ISP, and Ethernet PHY in outdoor surveillance units exposed to 48 V PoE-derived rails and lightning-induced surges. IC Role / Device Role / Timing Role: Primary 5 V or 3.3 V point-of-load regulator delivering 2 A with 70 V transient tolerance and hiccup-mode fault containment. Use Value: Eliminates need for upstream TVS and discrete buck controller, enabling compact 2-layer PCB designs compliant with IEC 61000-4-5 Level 4. |
Use Scenario: Supplying CCD sensor bias, video amplifier, and RS-485 transceiver in legacy analog CCTV cameras powered from unregulated 24 V AC/DC adapters. IC Role / Device Role / Timing Role: Wide-input buck converter regulating stable 12 V or 5 V output despite ±20% input variation and cold-start conditions. Use Value: 26 µA quiescent current extends battery backup runtime; FPWM mode prevents video frame jitter caused by variable-frequency PFM switching. |
| HVAC Valve & Actuator Control | Industrial Analog Input Modules |
|
Use Scenario: Powering stepper motor drivers, position feedback circuits, and 4–20 mA loop transmitters in field-mounted HVAC controllers operating from 24 V or 36 V DC buses. IC Role / Device Role / Timing Role: Robust 2 A POL regulator with thermal shutdown and input UVLO ensuring fail-safe behavior during brownouts or overheating. Use Value: Internal MOSFETs and 42.9°C/W θJA allow operation up to 125°C ambient without heatsink-reducing mechanical complexity and cost. |
Use Scenario: Generating isolated or non-isolated 3.3 V/5 V rails for precision ADCs, DACs, and microcontrollers in modular PLC analog input cards. IC Role / Device Role / Timing Role: High-accuracy buck converter with 1.0 V ±15 mV reference and power-good flag enabling synchronized system initialization. Use Value: PG output provides deterministic reset timing for FPGA-based data acquisition engines-preventing metastability during power ramp. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36520ADDAR | PFM/PWM auto-mode instead of forced PWM; 26 µA IQ vs same 400 kHz nominal frequency. | Better light-load efficiency but variable frequency-unsuitable where EMI predictability or audio-band noise is critical. | Select LMR36520ADDAR only when optimizing for ultra-low standby power in battery-backed systems. |
| LMR33620ADDAR | 36 V max input (vs 65 V); identical 2 A rating, FPWM option, and HSOIC-8 package. | Not suitable for 48 V or 60 V industrial buses; limited to lower-voltage automation and test equipment. | Choose LMR33620ADDAR for cost-sensitive 24 V applications where 70 V surge tolerance is unnecessary. |
Compared with LMR36520ADDAR, the LMR36520FADDAR trades light-load efficiency for EMI control and timing determinism; compared with LMR33620ADDAR, it adds 65 V capability and 70 V surge resilience-making it the only option for high-voltage industrial edge nodes requiring both FPWM and ruggedness.
Availability
LMR36520FADDAR is available at Aetrix Electronics and suitable for IP network cameras, HVAC actuator control, industrial analog input modules, and other applications requiring stable component supply under extended temperature and surge stress conditions.
Supply support for LMR36520FADDAR 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 expertise in high-reliability industrial and automotive power solutions.
The LMR36520FADDAR belongs to TI's SIMPLE SWITCHER® wide-input synchronous buck converter family, engineered for rugged industrial power supplies where input surge immunity, thermal robustness, and layout simplicity are critical design priorities.
FAQ
What distinguishes LMR36520FADDAR from the standard LMR36520ADDAR?
The LMR36520FADDAR is the forced PWM (FPWM) variant of the LMR36520 family, meaning it operates at a fixed 400 kHz switching frequency across all load conditions-including light loads-whereas LMR36520ADDAR automatically switches between PFM and PWM modes. This eliminates frequency variation, reduces audible noise, and simplifies EMI filter design. The LMR36520FADDAR retains identical 2 A output capability, 4.2–65 V input range, and 8-pin HSOIC packaging as the base part.
Does LMR36520FADDAR require external compensation components?
No, the LMR36520FADDAR features fully internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This reduces bill-of-materials count, PCB area, and design validation effort. The internal loop is optimized for stability with standard output capacitor ESR ranges and typical inductor values used in 2 A applications-enabling rapid prototyping without iterative compensation tuning.
What is the purpose of the PG (power-good) pin on LMR36520FADDAR?
The PG pin on LMR36520FADDAR is an open-drain output that signals when the regulated output voltage is within specification-asserting high (via external pull-up) after soft-start completes and VOUT reaches 95% of target. It includes built-in glitch filtering and a 4 ms startup delay, and pulls low during faults (thermal shutdown, current limit), EN deactivation, or undervoltage. This enables reliable system reset sequencing in microcontroller- or FPGA-based industrial controllers.
Can LMR36520FADDAR operate with input voltages below 4.2 V?
No, the absolute minimum recommended input voltage for LMR36520FADDAR is 4.2 V per its datasheet specifications. Operation below this level may result in failure to start, unstable regulation, or violation of internal bias requirements. The device incorporates input undervoltage lockout (UVLO) tied to the internal VCC LDO, which activates below ~3.3 V-ensuring controlled shutdown before functional failure occurs.
How does thermal management work on LMR36520FADDAR in the HSOIC-8 (DDA) package?
The LMR36520FADDAR in the DDA package relies on its exposed thermal pad for primary heat dissipation, requiring direct solder connection to a large internal or bottom-side PCB copper pour tied to PGND. With θJA = 42.9°C/W and θJB = 13.6°C/W, effective thermal design enables full 2 A operation at 125°C ambient when using ≥2 oz copper and ≥4 thermal vias under the pad. Thermal shutdown triggers at 170°C junction temperature with automatic recovery at 158°C-preventing permanent damage during transient overloads.
LMR36520FADDAR 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
LMR36520FADDAR FAQ
1.How can I place an order for LMR36520FADDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36520FADDAR 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 LMR36520FADDAR reliable?
The price and inventory of LMR36520FADDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36520FADDAR is usually 5 days.
3.What payment methods are accepted for LMR36520FADDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36520FADDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36520FADDAR?
LMR36520FADDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36520FADDAR 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 LMR36520FADDAR?
For technical support, including LMR36520FADDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36520FADDAR requirements.
6.How does Aetrix verify that LMR36520FADDAR is sourced from the original manufacturer or authorized distributors?
All LMR36520FADDAR 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 LMR36520FADDAR meets industry standards.
7.What is the process for return or replacement of LMR36520FADDAR?
All LMR36520FADDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR36520FADDAR, 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 LMR36520FADDAR part is unused and in its original packaging.
Return procedure for LMR36520FADDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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