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Texas Instruments LMR23630ADDAR
- Part No.:
- LMR23630ADDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR23630ADDAR.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,979
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Product details
Overview
LMR23630ADDAR from Texas Instruments is a 36-V, 3-A synchronous step-down DC-DC converter in an 8-pin HSOIC package with PowerPAD™. It delivers regulated output from 4 V to 36 V input, supports PFM/FPWM modes, features 400-kHz fixed switching frequency, 75-µA no-load quiescent current, and integrated current-mode control for industrial power conditioning in PLC CPU and HVAC control systems.
For engineers reviewing the LMR23630ADDAR datasheet, LMR23630ADDAR pinout, LMR23630ADDAR application, or LMR23630ADDAR equivalent, key selection considerations include input voltage range (4–36 V), continuous 3-A output capability, thermal performance in HSOIC, internal compensation, and precision enable functionality for system power sequencing.
Technical Context
The LMR23630ADDAR employs peak-current-mode control with fixed 400-kHz switching frequency and internal loop compensation, eliminating external compensation components. It integrates high-side and low-side NMOS FETs with RDS(on) of 185 mΩ/105 mΩ and supports soft-start into prebiased loads.
It operates in PFM mode at light load for ultra-low 75-µA IQ, or FPWM mode for constant-frequency operation and reduced output ripple. The device includes precision enable input with 1.55-V typical threshold, hiccup-mode short-circuit protection, and thermal shutdown at 170°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports wide-input industrial rails including 24-V and 36-V unregulated supplies. |
| Output Current | 3 A continuous - sufficient for powering microcontrollers, I/O modules, and sensor interfaces in automation systems. |
| Switching Frequency | Fixed 400 kHz - enables compact magnetics design and predictable EMI filtering without external timing components. |
| Quiescent Current | 75 µA in PFM mode - extends battery life in always-on or low-duty-cycle industrial monitoring applications. |
| Minimum On-Time | 60 ns - supports high duty-cycle operation down to ~1.6 V output at 36 V input, enabling wide VIN-to-VOUT ratios. |
| Enable Threshold | 1.55 V typical rising threshold - allows precise power sequencing with standard logic-level control signals. |
| Thermal Shutdown | 170°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design while enabling safe recovery. |
Pinout & Package
LMR23630ADDAR uses an 8-pin HSOIC (High-Speed Small Outline Integrated Circuit) package with exposed PowerPAD™ thermal pad (4.89 mm × 3.90 mm). The PowerPAD™ must be soldered to a PCB ground plane for effective heat dissipation and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Node | Connects to inductor; carries high di/dt switching waveform - requires short, low-inductance layout to minimize EMI. |
| 2 (BOOT) | Bootstrap Supply | Drives high-side gate via 100 nF–470 nF ceramic capacitor to SW - critical for proper high-side FET turn-on. |
| 3 (VCC) | Bias LDO Output | Internal 4.1-V regulator output - bypass with 2.2-µF/16-V capacitor to AGND; no external loading permitted. |
| 4 (FB) | Feedback Input | Senses output voltage via resistor divider; references internal 1-V precision bandgap - sets VOUT = 1 V × (1 + RFBB/RFBT). |
| 5 (EN/SYNC) | Enable & Sync Input | Active-high enable with 1.55-V threshold; also accepts external clock for synchronization - enables system-level timing coordination. |
| 6 (AGND) | Analog Ground | Reference for FB, EN/SYNC, and internal circuits - must connect to clean ground plane separate from PGND where possible. |
| 7 (VIN) | Power Input | Primary input supply (4–36 V); connects to bulk input capacitor - shortest possible trace to PGND reduces noise and improves stability. |
| 8 (PGND) | Power Ground | Low-side FET source connection - ties directly to CIN and COUT grounds and PowerPAD™ - forms main return path for high-current switching loops. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Rectification | Eliminates external Schottky diode, reducing conduction losses and board area - improves full-load efficiency by >5% vs. asynchronous designs. |
| Internal Compensation | Removes need for external Type-II/III compensation network - simplifies design, reduces BOM count, and ensures stable operation across all output capacitors. |
| PFM and FPWM Mode Selection | Enables trade-off between light-load efficiency (PFM) and output voltage regulation/EMI predictability (FPWM) - selectable via part variant or external configuration. |
| Soft Start into Prebiased Load | Prevents output voltage overshoot when powering up into existing bus voltage - essential for hot-swap and redundant power systems. |
| Precision Enable Input | 1.55-V typical threshold with 0.4-V hysteresis - supports accurate power sequencing with standard microcontroller GPIO or supervisor IC outputs. |
Applications
| PLC CPU Power Supply | HVAC Control Module |
|---|---|
Use Scenario: Powers ARM Cortex-M7-based CPU and peripheral I/O in programmable logic controller cabinets operating from 24-V DC field bus. IC Role / Device Role: Primary 3.3-V or 5-V point-of-load regulator delivering 2.5-A continuous current with tight load regulation (<±1%) across temperature. Use Value: 75-µA PFM quiescent current minimizes standby power draw during idle cycles; 400-kHz fixed frequency simplifies EMI filter design for CE-compliant industrial enclosures. | Use Scenario: Supplies 5-V rail to temperature/humidity sensors, relay drivers, and CAN transceivers in building management systems. IC Role / Device Role: Wide-VIN buck converter accepting fluctuating 24-V HVAC distribution bus (18–32 V) while maintaining stable 5-V output under dynamic fan/motor loads. Use Value: 60-ns minimum on-time supports regulation down to 1.6 V at max input, enabling future 1.8-V logic upgrades; hiccup-mode protection prevents latch-up during motor stall faults. |
| Factory Automation Sensor Hub | Asset Tracking Terminal |
Use Scenario: Powers multi-sensor node (IMU, pressure, analog inputs) in robotic cell monitoring system powered by 24-V factory bus. IC Role / Device Role: Single-chip 3-A regulator generating 3.3-V for MCU and 1.8-V via secondary LDO - handles bursty wireless transmission loads up to 2.8-A peak. Use Value: Internal current-mode control provides fast transient response to 1-A load steps in <5 µs; thermal shutdown at 170°C prevents damage during enclosure overheating events. | Use Scenario: Powers GPS/GSM module in battery-backed industrial asset tracker deployed in remote locations with solar charging. IC Role / Device Role: High-efficiency step-down regulator converting 12–36-V solar/battery input to 3.3-V MCU rail - operates continuously in PFM mode for multi-year battery life. Use Value: 2-µA shutdown current preserves battery during deep sleep; soft-start into prebiased load avoids brownout during wake-up from ultra-low-power state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR23625ADDAR | 2.5-A rated output, identical 8-pin HSOIC footprint and pinout - shares same control architecture and feature set. | Lower current rating suits cost-sensitive or lower-power nodes where 3-A headroom is unnecessary. | Select when full 3-A capability is not required; enables direct PCB reuse with minor inductor/capacitor derating. |
| LMR23630FDRR | 12-pin WSON package with RT pin for adjustable frequency (200 kHz–2.2 MHz); same 3-A rating and electrical specs. | Supports EMI-sensitive applications requiring frequency tuning or synchronization; wettable flanks aid automated optical inspection. | Choose for designs needing flexible switching frequency or enhanced thermal performance (RθJA = 41.5°C/W vs. 42.0°C/W). |
Compared with LMR23625ADDAR, the LMR23630ADDAR provides higher current headroom for future-proofing; compared with LMR23630FDRR, it offers simpler layout and lower component count due to fixed-frequency operation and smaller HSOIC footprint.
Availability
LMR23630ADDAR is available at Aetrix Electronics and suitable for factory automation, building HVAC control, and asset tracking terminals requiring stable component supply, long-term industrial lifecycle support, and consistent parametric performance across temperature.
Supply support for LMR23630ADDAR 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 over 90 years of innovation in industrial-grade components.
The LMR23630ADDAR belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC-DC regulators, designed specifically for rugged industrial power conversion where reliability, wide input range, and minimal external components are critical.
FAQ
What is the maximum input voltage rating for the LMR23630ADDAR?
The LMR23630ADDAR has an absolute maximum input voltage rating of 42 V, but its recommended operating input voltage range is 4 V to 36 V. Operation above 36 V may trigger undervoltage lockout or cause reliability degradation. The device is optimized for industrial 24-V and 36-V supply rails, and its 36-V max rating accommodates transients and ripple common in factory environments.
Does the LMR23630ADDAR require external compensation components?
No, the LMR23630ADDAR features fully internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces BOM count, and ensures stable operation across a wide range of output capacitors - including ceramic, polymer, and electrolytic types - without requiring loop analysis or tuning.
What package type and thermal characteristics does the LMR23630ADDAR use?
The LMR23630ADDAR uses an 8-pin HSOIC package with PowerPAD™ (4.89 mm × 3.90 mm). Its junction-to-ambient thermal resistance (RθJA) is 42.0°C/W, and the exposed thermal pad must be soldered to a PCB ground plane for effective heat dissipation. Thermal shutdown activates at 170°C with 15°C hysteresis to protect against sustained overload conditions.
Can the LMR23630ADDAR operate with a prebiased output voltage?
Yes, the LMR23630ADDAR supports soft start into a prebiased load. Its internal soft-start circuitry prevents output voltage overshoot when enabled into an already energized rail - a critical capability for hot-swap systems, redundant power architectures, and systems with multiple cascaded regulators sharing a common output bus.
How does the LMR23630ADDAR handle short-circuit conditions?
The LMR23630ADDAR implements hiccup-mode short-circuit protection: upon detecting valley current limit violation for 64 consecutive cycles, it shuts down the switching action for 5 ms (HSOIC), then retries. This limits average power dissipation during fault, prevents thermal runaway, and enables automatic recovery once the fault is cleared - unlike latch-off protection that requires external reset.
LMR23630ADDAR 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):
- 4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 3A
- 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
LMR23630ADDAR FAQ
1.How can I place an order for LMR23630ADDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR23630ADDAR 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 LMR23630ADDAR reliable?
The price and inventory of LMR23630ADDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR23630ADDAR is usually 5 days.
3.What payment methods are accepted for LMR23630ADDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR23630ADDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR23630ADDAR?
LMR23630ADDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR23630ADDAR 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 LMR23630ADDAR?
For technical support, including LMR23630ADDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR23630ADDAR requirements.
6.How does Aetrix verify that LMR23630ADDAR is sourced from the original manufacturer or authorized distributors?
All LMR23630ADDAR 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 LMR23630ADDAR meets industry standards.
7.What is the process for return or replacement of LMR23630ADDAR?
All LMR23630ADDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR23630ADDAR, 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 LMR23630ADDAR part is unused and in its original packaging.
Return procedure for LMR23630ADDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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