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Texas Instruments LMR23630DRRT
- Part No.:
- LMR23630DRRT
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LMR23630DRRT.pdf
- Description:
- IC REG BUCK ADJ 3A 12SON
- Quantity:
- Payment:
- Shipping:
Inventory:1,188
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Product details
Overview
LMR23630DRRT from Texas Instruments is a 36-V, 3-A synchronous step-down DC-DC converter in a 12-pin WSON wettable flanks package with PowerPAD™. It delivers regulated output from 4 V to 36 V input, supports PFM/FPWM modes, features 60 ns minimum on-time, internal compensation, and precision enable. It is used in factory automation power rails for PLC CPU and HVAC control.
For engineers reviewing the LMR23630DRRT datasheet, LMR23630DRRT pinout, LMR23630DRRT application, or LMR23630DRRT equivalent, key selection criteria include adjustable switching frequency (200–2200 kHz via RT pin), 75 µA quiescent current in PFM mode, hiccup-mode short-circuit protection, thermal shutdown at 170°C, and compatibility with 3.3 V or 5 V output configurations.
Technical Context
The LMR23630DRRT employs peak-current-mode control with fixed-frequency operation and light-load PFM mode entry. Its RT pin enables precise frequency programming from 200 kHz to 2200 kHz using an external resistor, while EN/SYNC supports both enable logic and external clock synchronization within the same range.
It integrates high-side and low-side NMOS power FETs (RDS(on) = 160 mΩ / 95 mΩ), uses a precision 1-V internal reference for ±1% output voltage accuracy over temperature, and implements cycle-by-cycle current limiting with hiccup recovery (64 cycles, 10 ms retry delay in WSON).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports wide industrial input sources including 24 V rail and battery-backed systems. |
| Output Current | 3 A continuous - sufficient for powering microcontrollers, I/O modules, and sensor interfaces in PLCs. |
| Switching Frequency | Adjustable 200–2200 kHz via RT pin - enables EMI optimization and inductor size reduction. |
| Quiescent Current | 75 µA in PFM mode - extends battery life in always-on industrial monitoring nodes. |
| Min. On-Time | 60 ns - supports high duty-cycle operation (e.g., 5 V out from 12 V in) without pulse skipping. |
| Thermal Shutdown | 170°C threshold with 15°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Reference Voltage | 1.0 V ±1% over –40°C to +125°C - ensures stable feedback across industrial temperature range. |
Pinout & Package
LMR23630DRRT is housed in a 12-pin WSON (3.0 mm × 3.0 mm) wettable flanks package with exposed thermal pad. The package supports automated optical inspection (AOI) and improves solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Connects to power inductor; carries high di/dt switching current - requires short, low-inductance layout. |
| BOOT | Bootstrap supply | Drives high-side gate; requires 100 nF–470 nF ceramic capacitor between BOOT and SW. |
| VCC | Bias LDO output | Internal 4.1 V supply; bypass with 2.2 µF/16 V capacitor to AGND - no external load permitted. |
| FB | Feedback input | Monitors output via resistor divider; 1 V reference enables precise VOUT setting (e.g., 3.3 V or 5 V). |
| EN/SYNC | Enable & sync input | Active-high enable; also accepts AC-coupled external clock (200–2200 kHz) for system-level timing alignment. |
| RT | Frequency set | Connect resistor to AGND to program fSW; floating defaults to 400 kHz - not to be shorted to ground. |
| AGND | Analog ground | Reference for FB, EN/SYNC, RT; must tie to clean ground plane separate from PGND return paths. |
| PGND | Power ground | Low-side FET source return; connects to CIN/COUT grounds and thermal pad - shortest possible path required. |
| Thermal Pad | Die thermal path | Exposed copper pad under package; must be soldered to large PCB ground plane for RθJB = 16.3°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external compensation network - reduces BOM count and layout sensitivity. |
| Soft start into prebiased load | Prevents output overshoot when powering up partially charged rails - critical for hot-swap and multi-rail sequencing. |
| Hiccup-mode short-circuit protection | Enters 10 ms off-cycle after 64 consecutive current-limit events - prevents thermal runaway during sustained fault. |
| Wettable flanks WSON package | Enables AOI-compatible solder joint inspection - improves manufacturing yield in high-reliability industrial assembly. |
| PFM/FPWM mode selection | Configurable via pin option (FDRR vs DRR) - balances light-load efficiency (PFM) vs ripple/noise performance (FPWM). |
Applications
| PLC CPU Power Supply | HVAC Control Module |
|---|---|
Use Scenario: Powers ARM Cortex-M7-based CPU and DDR memory interface in modular programmable logic controller rack. IC Role / Device Role / Timing Role: Primary 3.3 V/3 A point-of-load regulator; supplies core logic and I/O buffers with tight transient response. Use Value: 60 ns min on-time enables stable 3.3 V output from 12 V backplane even under full load, minimizing dropout risk. | Use Scenario: Regulates 5 V rail for microcontroller, CAN transceiver, and analog sensor front-end in commercial HVAC zone controller. IC Role / Device Role / Timing Role: Main DC-DC converter delivering clean, low-noise 5 V from 24 V HVAC bus. Use Value: FPWM mode option suppresses audible noise and maintains constant frequency for EMI filtering predictability. |
| Asset Tracking Node | Industrial Sensor Hub |
Use Scenario: Powers ultra-low-power GPS/GSM module and accelerometer in battery-operated fleet tracking device. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in PFM mode during sleep intervals. Use Value: 75 µA quiescent current extends 2000 mAh Li-SOCl₂ battery life to >5 years in periodic wake-up operation. | Use Scenario: Supplies 3.3 V to multiple analog sensors (temperature, pressure, humidity) and ADC in distributed IIoT edge node. IC Role / Device Role / Timing Role: Central power management IC with precision enable for controlled subsystem wake-up. Use Value: Precision enable threshold (1.55 V typical) allows clean power sequencing with MCU GPIO without external level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR23630FDRR | Same WSON-12 package, but includes FPWM mode (not PFM); PGOOD pin instead of RT pin. | Preferred where low-output-ripple and constant-frequency operation are mandatory (e.g., RF-sensitive sensor hubs). | Select LMR23630FDRR if system requires guaranteed fixed-frequency operation regardless of load; LMR23630DRRT is optimal for battery-life-critical PFM use cases. |
| LMR23625DRRT | 2.5 A version, pin-to-pin compatible WSON-12, identical feature set and pinout except lower current limit. | Suitable for cost-optimized designs with margin below 3 A (e.g., auxiliary 3.3 V rail in non-CPU subsystems). | Choose LMR23625DRRT only when verified peak load remains ≤2.5 A - avoids overdesign while maintaining layout compatibility. |
Compared with LMR23630FDRR, LMR23630DRRT trades FPWM capability for frequency adjustability and lower light-load IQ; versus LMR23625DRRT, it provides 0.5 A higher current headroom without changing PCB layout or thermal design.
Availability
LMR23630DRRT is available at Aetrix Electronics and suitable for factory automation, building control, and asset tracking applications requiring stable component supply, long-term industrial lifecycle support, and consistent parametric performance across temperature.
Supply support for LMR23630DRRT 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 power solutions.
The LMR23630DRRT belongs to TI's SIMPLE SWITCHER® family - designed specifically for rugged, easy-to-deploy DC-DC conversion in harsh industrial environments where reliability, thermal robustness, and minimal external components are essential.
FAQ
What is the function of the RT pin on the LMR23630DRRT?
The RT pin on the LMR23630DRRT sets the switching frequency by connecting an external resistor to AGND. Using Equation RT(kΩ) = 40200 / fSW(kHz) – 0.6, designers can program frequencies from 200 kHz to 2200 kHz. Leaving RT floating configures LMR23630DRRT for default 400 kHz operation. Shorting RT to ground is prohibited and may damage the device.
Does the LMR23630DRRT support synchronization to an external clock?
Yes, the LMR23630DRRT supports external clock synchronization via its EN/SYNC pin. An AC-coupled positive pulse (2.8–5.5 V amplitude, ≥100 ns pulse width) can be injected to lock the internal oscillator to an external clock in the 200 kHz–2200 kHz range. This capability enables timing alignment across multiple LMR23630DRRT units in synchronized power systems.
What thermal management considerations apply to the LMR23630DRRT in its WSON package?
The LMR23630DRRT in WSON-12 relies on its exposed thermal pad for heat dissipation. To achieve RθJB = 16.3°C/W, the pad must be soldered to a minimum 200 mm² copper area on the PCB's inner or bottom layer, connected via ≥4 thermal vias (0.3 mm diameter). Poor thermal pad connection raises junction temperature and triggers thermal shutdown at 170°C.
How does the LMR23630DRRT handle short-circuit conditions?
The LMR23630DRRT responds to output short circuits with hiccup-mode protection: after 64 consecutive current-limit events, it shuts down for 10 ms before attempting restart. This limits average power dissipation and prevents thermal runaway. Recovery is automatic and does not require cycling EN. The LMR23630DRRT also includes cycle-by-cycle current limiting and thermal shutdown as layered safeguards.
Can the LMR23630DRRT be used to generate a 3.3 V output from a 24 V input?
Yes, the LMR23630DRRT can generate 3.3 V from 24 V input using a resistor divider on the FB pin (e.g., RFBB = 10 kΩ, RFBT = 23 kΩ). With 60 ns minimum on-time and peak-current-mode control, it maintains regulation even at ~14% duty cycle. Efficiency exceeds 85% at 1 A load (VIN = 24 V, VOUT = 3.3 V, fSW = 400 kHz), per Figure 7-2 in the LMR23630DRRT datasheet.
LMR23630DRRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 12-WFDFN Exposed Pad
- 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:
- 150kHz ~ 2.425MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-SON (3x3)
LMR23630DRRT FAQ
1.How can I place an order for LMR23630DRRT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR23630DRRT 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 LMR23630DRRT reliable?
The price and inventory of LMR23630DRRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR23630DRRT is usually 5 days.
3.What payment methods are accepted for LMR23630DRRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR23630DRRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR23630DRRT?
LMR23630DRRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR23630DRRT 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 LMR23630DRRT?
For technical support, including LMR23630DRRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR23630DRRT requirements.
6.How does Aetrix verify that LMR23630DRRT is sourced from the original manufacturer or authorized distributors?
All LMR23630DRRT 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 LMR23630DRRT meets industry standards.
7.What is the process for return or replacement of LMR23630DRRT?
All LMR23630DRRT units undergo pre-shipment inspection (PSI). If there is an issue with LMR23630DRRT, 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 LMR23630DRRT part is unused and in its original packaging.
Return procedure for LMR23630DRRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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