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Texas Instruments LMR36510FADDAR
- Part No.:
- LMR36510FADDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR36510FADDAR.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,222
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Product details
Overview
LMR36510FADDAR from Texas Instruments is a synchronous step-down DC/DC converter delivering 1A output current across a 4.2V–65V input range, featuring FPWM mode operation, 400kHz fixed switching frequency, and integrated high-side/low-side MOSFETs. It serves as a rugged primary power supply in industrial edge nodes requiring surge immunity (70V transient tolerance) and reliable power-good signaling.
For engineers reviewing the LMR36510FADDAR datasheet, LMR36510FADDAR pinout, LMR36510FADDAR application, or LMR36510FADDAR equivalent, key selection criteria include its FPWM operation (vs PFM variants), 26µA quiescent current, internal compensation, thermal shutdown at 170°C, and HSOIC-8 package compatibility with scalable SIMPLE SWITCHER families.
Technical Context
The LMR36510FADDAR uses peak-current mode control with auto-mode transition between FPWM (fixed-frequency PWM) and PFM (pulse-frequency modulation) based on load. Its internal 5V LDO powers control circuitry, while the open-drain PG pin provides filtered, delayed power-good indication with 93–95% lower threshold and 105–110% upper threshold relative to 1V FB reference.
It integrates high-side (245–465mΩ RDS(on)) and low-side (165–310mΩ RDS(on)) MOSFETs, supports dropout operation down to VIN ≈ VOUT + 0.4V via frequency foldback, and implements cycle-by-cycle current limiting (1.6–2.4A high-side, 1–1.6A low-side) plus hiccup-mode short-circuit protection triggered below 0.4V FB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 65V - supports wide-VIN industrial rails including 24V, 36V, 48V systems and withstands 70V transients per IEC 61000-4-5. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and analog front-ends in IP cameras and IO modules. |
| Switching Frequency | 400kHz ±15% - enables compact magnetics and predictable EMI profile; fixed in FPWM mode (no frequency dither). |
| Quiescent Current | 26µA typical - minimizes standby power loss in always-on security or HVAC control applications. |
| Feedback Reference | 1.000V ±15mV - enables precise adjustable output from 1V 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 built-in glitch filtering and ~4ms startup delay. |
| Thermal Shutdown | 170°C shutdown / 158°C recovery - protects against sustained overload or poor PCB thermal design without latch-off. |
Pinout & Package
The LMR36510FADDAR is housed in an 8-pin HSOIC (DDA) package measuring 4.9mm × 6mm, with exposed thermal pad for enhanced heat dissipation. The package is RoHS-compliant and designed for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1) | Power and analog ground | Primary return path for high-current switching and internal references; must connect to low-impedance ground plane with short, wide traces. |
| VIN (2) | Main input supply | Accepts 4.2–65V input; requires local ceramic bypass capacitor directly to PGND to suppress high-frequency ripple and transients. |
| EN (3) | Enable control input | Logic-level enable with precision thresholds (1.14V high, 0.3V low); can be tied directly to VIN or driven by external supervisor. |
| PG (4) | Open-drain power-good flag | Signals regulated output status; requires external pull-up (to VCC or VOUT); asserts low during startup, fault, or EN deactivation. |
| FB (5) | Feedback voltage sense | Monitors output via resistive divider; 1V reference enables stable regulation; must not float or be grounded. |
| VCC (6) | Internal 5V LDO output | Powers internal circuitry; not for external loads; requires 1µF ceramic capacitor to PGND for stability. |
| BOOT (7) | Bootstrap supply | Drives high-side MOSFET gate; requires 100nF ceramic capacitor between BOOT and SW pins. |
| SW (8) | Switch node | Connects to power inductor; carries high dv/dt switching waveform; layout critical for EMI and efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| FPWM Operation Mode | Fixed 400kHz switching regardless of load - eliminates audible noise and simplifies EMI filter design vs variable-frequency PFM. |
| Integrated Power MOSFETs | High-side + low-side FETs with RDS(on) ≤ 465mΩ/310mΩ - reduces BOM count, eliminates external driver design, and improves thermal performance. |
| Internal Compensation | No external compensation network required - cuts design time, saves board space, and avoids stability tuning errors. |
| 70V Input Transient Tolerance | Withstands 70V surges without damage - meets IEC 61000-4-5 Level 3/4 requirements, eliminating need for upstream TVS clamping in many cases. |
| Programmable Power-Good | Filtered, delayed PG output with 105–110%/93–95% VFB thresholds - replaces external supervisor IC and ensures clean system reset timing. |
| Thermal & Fault Protection | Thermal shutdown (170°C), hiccup-mode short-circuit, cycle-by-cycle current limit, and input UVLO - enables unattended operation in harsh environments. |
Applications
| IP Network Cameras | Analog Security Cameras |
|---|---|
|
Use Scenario: Powering image sensor, ISP, and Ethernet PHY from 24V or 48V PoE-derived rail under varying ambient temperatures. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC buck regulator providing stable 3.3V or 5V with fast transient response to handle burst video processing loads. Use Value: 90% efficiency at 1A/5V reduces thermal load in sealed enclosures; 70V transient tolerance prevents field failures from lightning-induced surges on outdoor camera lines. |
Use Scenario: Supplying CCD/CMOS sensor, video DAC, and motorized lens control from 12V–48V industrial power bus. IC Role / Device Role / Timing Role: Wide-input buck converter delivering regulated 5V/1A with precise power-good signaling to synchronize camera boot sequence. Use Value: 26µA quiescent current extends battery backup runtime; FPWM mode ensures consistent EMI behavior during motion-triggered recording bursts. |
| HVAC Valve & Actuator Control | AC Drive & Servo Drive Control Modules |
|
Use Scenario: Powering microcontroller, position encoder interface, and H-bridge gate drivers in electrically noisy HVAC field units. IC Role / Device Role / Timing Role: Robust point-of-load regulator converting 24V/48V plant supply to 3.3V logic and 5V analog rails with high ESD immunity (±2.5kV HBM). Use Value: Integrated thermal shutdown and hiccup protection prevent latch-up during actuator stall conditions; HSOIC-8 package allows compact layout near motor terminals. |
Use Scenario: Generating isolated logic supply for gate drivers and MCU in compact AC drive control boards operating from 36V–60V intermediate bus. IC Role / Device Role / Timing Role: High-reliability buck converter supplying 5V/1A to digital control section with accurate power-good flag for safe start-up sequencing. Use Value: Pin compatibility with LMR36520 allows seamless upgrade to 2A when drive firmware adds real-time analytics; 400kHz frequency enables small 2.2µH inductors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36510ADDAR | Same 1A/65V specs but operates in PFM mode at light loads - higher light-load efficiency but variable frequency and increased output ripple. | Better suited for battery-backed or ultra-low-power standby modes where quiescent current dominates system budget. | Select LMR36510ADDAR if EMI predictability is secondary to <10µA no-load current; choose LMR36510FADDAR for fixed-frequency compliance-critical designs. |
| LMR33610ADJR | 36V max input, same 1A rating, 400kHz FPWM, HSOIC-8 pinout - lower voltage rating but improved RDS(on) (180/120mΩ) and 17µA IQ. | Ideal for 24V-only systems like PLC I/O modules where 65V headroom is unnecessary and lower conduction loss is prioritized. | Choose LMR33610ADJR for cost-sensitive 24V applications needing marginally better efficiency; retain LMR36510FADDAR when 48V/60V surge resilience is mandatory. |
Compared with LMR36510ADDAR, the LMR36510FADDAR trades light-load efficiency for EMI predictability via fixed-frequency operation; versus LMR33610ADJR, it sacrifices some conduction loss and quiescent current to deliver 65V input capability and 70V surge tolerance essential for outdoor or factory-floor deployments.
Availability
LMR36510FADDAR is available at Aetrix Electronics and suitable for IP network cameras, HVAC valve control, AC drive modules, analog security systems, and general-purpose wide-VIN industrial power supplies requiring stable component supply and long-term manufacturability.
Supply support for LMR36510FADDAR 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 expertise in high-reliability industrial power conversion.
The LMR36510FADDAR belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC/DC converters, engineered specifically for rugged industrial applications demanding wide input range, integrated protection, and minimal external components.
FAQ
What is the key functional difference between LMR36510FADDAR and LMR36510ADDAR?
The LMR36510FADDAR operates exclusively in FPWM (fixed-frequency PWM) mode across all load conditions, ensuring constant 400kHz switching for predictable EMI and reduced output ripple. In contrast, the LMR36510ADDAR switches automatically between PFM (light load) and PWM (heavy load), improving light-load efficiency but introducing variable frequency and higher ripple. Both share identical pinout, package, and 1A/65V ratings.
Does LMR36510FADDAR require external compensation components?
No, the LMR36510FADDAR 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 while maintaining stability across the full 4.2V–65V input range and 1V–28V output range with standard output capacitors.
What is the minimum output voltage achievable with LMR36510FADDAR?
The LMR36510FADDAR supports an adjustable output voltage down to 1V, set by the feedback resistor divider referenced to its 1.000V ±15mV internal reference. Output voltages below 1V are not supported; the device cannot regulate below this threshold due to FB pin architecture and reference accuracy limits.
How does the power-good (PG) function behave during startup of LMR36510FADDAR?
Upon EN assertion, the LMR36510FADDAR initiates soft-start and holds PG low for approximately 4ms (typical) before asserting high, provided output voltage reaches regulation within the 93–95% lower and 105–110% upper thresholds of the 1V FB reference. This built-in delay ensures reliable system reset timing without external timers or supervisors.
Can LMR36510FADDAR operate safely at 65V input continuously?
Yes, the LMR36510FADDAR is rated for continuous operation up to 65V input (VIN), with absolute maximum rating of 70V for transient surges. At 65V input, thermal performance depends on PCB layout and airflow; junction temperature must remain ≤125°C for reliable operation, supported by the device's 42.9°C/W θJA in HSOIC-8 package with proper thermal pad connection.
LMR36510FADDAR 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):
- 61.75V
- Current - Output:
- 1A
- 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
LMR36510FADDAR FAQ
1.How can I place an order for LMR36510FADDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36510FADDAR 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 LMR36510FADDAR reliable?
The price and inventory of LMR36510FADDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36510FADDAR is usually 5 days.
3.What payment methods are accepted for LMR36510FADDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36510FADDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36510FADDAR?
LMR36510FADDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36510FADDAR 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 LMR36510FADDAR?
For technical support, including LMR36510FADDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36510FADDAR requirements.
6.How does Aetrix verify that LMR36510FADDAR is sourced from the original manufacturer or authorized distributors?
All LMR36510FADDAR 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 LMR36510FADDAR meets industry standards.
7.What is the process for return or replacement of LMR36510FADDAR?
All LMR36510FADDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR36510FADDAR, 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 LMR36510FADDAR part is unused and in its original packaging.
Return procedure for LMR36510FADDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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