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Texas Instruments LMR23630FDRRR
- Part No.:
- LMR23630FDRRR
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LMR23630FDRRR.pdf
- Description:
- IC REG BUCK ADJ 3A 12SON
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LMR23630FDRRR from Texas Instruments is a 36-V, 3-A synchronous step-down DC-DC converter in a 12-pin WSON package with wettable flanks, featuring adjustable switching frequency (200–2200 kHz), FPWM mode for low ripple, and precision enable input. It delivers regulated output from 4-V to 36-V input for industrial power conditioning in PLC CPU and HVAC control systems.
For engineers reviewing the LMR23630FDRRR datasheet, LMR23630FDRRR pinout, LMR23630FDRRR application, or LMR23630FDRRR equivalent, key selection factors include its FPWM/PGOOD-enabled WSON-12 variant, 60 ns minimum on-time, 75 µA PFM quiescent current, and compatibility with external clock synchronization up to 2.2 MHz.
Technical Context
The LMR23630FDRRR uses peak-current-mode control with internal compensation, enabling stable regulation across wide VIN (4–36 V) and VOUT (1–28 V) ranges without external loop components. Its FPWM mode enforces constant 400-kHz (or adjustable) switching, eliminating light-load frequency variation and minimizing output voltage ripple.
This variant integrates a PGOOD open-drain flag (Pin 6) and supports soft-start into prebiased loads, thermal shutdown at 170°C, hiccup-mode short-circuit protection, and cycle-by-cycle current limiting with 4–5.5 A valley limit (WSON). The RT pin is omitted; frequency adjustment is disabled - only FPWM and SYNC functionality remain active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports unregulated industrial rails including 24-V DC and automotive battery inputs. |
| Output Current | 3 A continuous - sustains full load under thermal limits with proper PCB copper area and airflow. |
| Switching Frequency | Fixed 400 kHz default, synchronizable 200–2200 kHz - enables EMI optimization and noise-sensitive system timing alignment. |
| Quiescent Current | 75 µA in PFM mode - extends battery life in always-on industrial sensors and asset trackers. |
| Minimum On-Time | 60 ns - allows high duty-cycle operation down to ~1.6 V output at 36 V input without pulse-skipping instability. |
| Power-Good Flag | Open-drain PGOOD with 94–96.5% UV / 104–110% OV thresholds - provides reliable system power sequencing and fault detection. |
| Enable Threshold | 1.4–1.7 V rising, 0.4 V hysteresis - enables precise multi-rail power-up coordination with external supervisors. |
Pinout & Package
LMR23630FDRRR is housed in a 3.00 mm × 3.00 mm, 12-pin WSON package with wettable flanks and exposed thermal pad (Pin 9) for enhanced solder joint inspection and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch node | Connects to inductor; carries high di/dt switching current - requires short, low-inductance trace to minimize EMI and voltage spikes. |
| 2 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100 nF ceramic capacitor between BOOT and SW for reliable gate drive. |
| 3 VCC | Bias LDO output | Internal 4.1-V regulator; must be bypassed with 2.2-µF/16-V capacitor to AGND - no external loading permitted. |
| 4 FB | Voltage feedback input | Senses output via resistor divider; 1-V reference enables accurate VOUT setting from 1 V to 28 V with ±0.5% typical tolerance. |
| 5 EN/SYNC | Enable & sync input | Active-high enable with 1.55-V threshold; accepts AC-coupled external clock (200–2200 kHz) for synchronized switching. |
| 6 PGOOD | Power-good flag | Open-drain output asserted when VOUT is within ±6% of target - requires external pullup (10–100 kΩ) to logic rail ≤12 V. |
| 7 AGND | Analog ground | Reference for FB, EN/SYNC, and internal circuits - must connect directly to low-noise system ground plane. |
| 8 VIN | Main input supply | Accepts 4–36 V; decoupling capacitor (≥10 µF ceramic + bulk) must be placed adjacent to this pin. |
| 9 PAD | Thermal pad | Internally connected to AGND and PGND - must be soldered to ≥200 mm² copper pour for RθJB = 16.3 °C/W thermal performance. |
| 10 PGND | Power ground | Low-side FET source return - connects to CIN/COUT grounds and thermal pad; separate from AGND at single-point star ground. |
| 11 NC | No connect | Not internally bonded - must remain floating; no routing or solder mask opening required. |
| 12 PGND | Power ground | Dual PGND pins (10 & 12) reduce ground impedance and improve current sharing in high-current paths. |
Key Features
| Feature | Design Value |
|---|---|
| FPWM mode operation | Eliminates light-load frequency dither, ensuring constant 400-kHz switching and <15 mVpp output ripple at 10-mA load. |
| Integrated PGOOD | Provides system-level power validation with 150-μs rise/fall deglitching - avoids false triggers during transient events. |
| Soft-start into prebiased load | Prevents reverse current flow when powering up into an already-biased rail - critical for hot-swap and redundant supply designs. |
| Thermal shutdown with hysteresis | Shuts down at 170°C (±8°C) and restarts after 15°C cooldown - prevents thermal runaway during overload or poor heatsinking. |
| Internal compensation | Removes need for external Type-II/III compensation network - reduces BOM count by ≥4 components and layout area by >30%. |
Applications
| PLC CPU Power Supply | HVAC Control Unit |
|---|---|
Use Scenario: Powers 3.3-V or 5-V microcontroller, FPGA, and I/O peripherals in programmable logic controllers operating from 24-V industrial bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, sequenced, and monitored 3-A output with PGOOD-driven reset assertion. Use Value: Enables robust operation across –40°C to +85°C ambient with <1% load regulation error and hiccup-mode protection against field-wiring shorts. | Use Scenario: Supplies 5-V logic and 3.3-V sensors in building automation thermostats and zone controllers powered from 24-VAC/DC distribution. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator supporting intermittent wireless transmission bursts while maintaining low standby IQ. Use Value: Achieves >85% efficiency at 10-mA load (PFM) and <20-mVpp ripple during Wi-Fi transmit (FPWM), extending battery life in wireless HVAC nodes. |
| Asset Tracking Device | Industrial Sensor Node |
Use Scenario: Powers GPS/GSM module, MCU, and flash memory in battery-operated logistics trackers deployed in vehicles and containers. IC Role / Device Role / Timing Role: Wide-input buck converter enabling direct connection to 12-V vehicle battery with cold-crank tolerance down to 4 V. Use Value: Delivers 3-A peak during GPS acquisition while consuming only 75 µA quiescent current in sleep mode - extends 2000-mAh Li-ion battery to >5 years shelf life. | Use Scenario: Regulates power for MEMS accelerometers, temperature sensors, and LoRa transceivers in predictive maintenance vibration monitors. IC Role / Device Role / Timing Role: Low-noise, thermally robust DC-DC stage with PGOOD confirmation before sensor sampling begins. Use Value: Maintains ±0.5% output accuracy over –40°C to +125°C junction temperature, ensuring calibrated sensor readings without software correction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR23630APDRR | Includes PGOOD and fixed 400-kHz frequency; differs in pin 6 function (PGOOD vs. RT in DRR variants) and absence of FPWM option. | Used where power-good signaling is required but frequency adjustability is unnecessary; lacks FPWM's low-light-load ripple control. | Select LMR23630APDRR if PGOOD is needed without FPWM, or if board layout reuses existing PGOOD-pullup design. |
| LMR23625FDDA | 2.5-A HSOIC-8 variant with identical FPWM/PGOOD feature set but lower current rating and larger 4.89 mm × 3.90 mm footprint. | Preferred for space-tolerant designs needing simpler thermal management and legacy SOIC-compatible layouts. | Choose LMR23625FDDA when 2.5-A output suffices and HSOIC-8 mechanical fit or qualification history is mandated. |
Compared with LMR23630FDRRR, LMR23630APDRR offers identical PGOOD capability but omits FPWM, while LMR23625FDDA trades 3-A capacity and WSON miniaturization for SOIC manufacturability and relaxed thermal constraints - all three share pin-compatible feedback, enable, and power-good interfaces.
Availability
LMR23630FDRRR is available at Aetrix Electronics and suitable for factory automation, building HVAC control, and asset tracking applications requiring stable component supply, long-term industrial lifecycle support, and consistent WSON-12 wettable flank packaging.
Supply support for LMR23630FDRRR 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 power conversion.
The LMR23630FDRRR belongs to TI's SIMPLE SWITCHER® synchronous buck regulator family, engineered for ease-of-use in harsh industrial environments where wide input range, integrated protection, and minimal external components are essential.
FAQ
What is the switching frequency configuration of the LMR23630FDRRR?
The LMR23630FDRRR operates at a fixed 400-kHz switching frequency by default and supports external synchronization from 200 kHz to 2200 kHz via the EN/SYNC pin. Unlike RT-equipped variants, it does not support resistor-based frequency adjustment - the RT pin is absent in this PGOOD/FPWM-specific WSON-12 configuration.
Does the LMR23630FDRRR support power-good signaling?
Yes, the LMR23630FDRRR includes an open-drain PGOOD pin (Pin 6) that asserts low when output voltage deviates beyond ±6% of the target. It features 150-μs rise/fall deglitching and requires an external 10–100-kΩ pullup resistor to a logic rail ≤12 V - a core requirement for safe system power sequencing in PLC and HVAC applications.
How does FPWM mode improve performance in the LMR23630FDRRR?
FPWM mode in the LMR23630FDRRR forces constant-frequency operation even at light loads, eliminating PFM's variable-frequency behavior. This reduces conducted EMI, maintains tight output voltage regulation (<15 mVpp ripple at 10 mA), and ensures predictable timing for downstream clocks and ADC sampling - critical in noise-sensitive industrial sensor nodes.
What thermal management is required for full 3-A operation of the LMR23630FDRRR?
For continuous 3-A output, the LMR23630FDRRR requires its exposed thermal pad (Pin 9) soldered to ≥200 mm² of inner-layer or bottom-side copper with ≥4 thermal vias (0.3-mm diameter) connecting to solid ground planes. This achieves RθJB ≈ 16.3 °C/W, limiting junction temperature rise to <50°C at 25°C ambient - essential to avoid thermal shutdown at full load.
Can the LMR23630FDRRR start up into a prebiased output voltage?
Yes, the LMR23630FDRRR supports soft-start into a prebiased load via controlled gate drive sequencing. When enabled with VOUT already present, it ramps the high-side switch duty cycle gradually while monitoring FB voltage, preventing reverse current flow and avoiding output overshoot - a key capability for hot-swap and redundant power supply architectures.
LMR23630FDRRR 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)
LMR23630FDRRR FAQ
1.How can I place an order for LMR23630FDRRR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR23630FDRRR 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 LMR23630FDRRR reliable?
The price and inventory of LMR23630FDRRR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR23630FDRRR is usually 5 days.
3.What payment methods are accepted for LMR23630FDRRR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR23630FDRRR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR23630FDRRR?
LMR23630FDRRR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR23630FDRRR 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 LMR23630FDRRR?
For technical support, including LMR23630FDRRR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR23630FDRRR requirements.
6.How does Aetrix verify that LMR23630FDRRR is sourced from the original manufacturer or authorized distributors?
All LMR23630FDRRR 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 LMR23630FDRRR meets industry standards.
7.What is the process for return or replacement of LMR23630FDRRR?
All LMR23630FDRRR units undergo pre-shipment inspection (PSI). If there is an issue with LMR23630FDRRR, 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 LMR23630FDRRR part is unused and in its original packaging.
Return procedure for LMR23630FDRRR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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