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Texas Instruments LMR23630DRRR
- Part No.:
- LMR23630DRRR
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LMR23630DRRR.pdf
- Description:
- IC REG BUCK ADJ 3A 12SON
- Quantity:
- Payment:
- Shipping:
Inventory:2,918
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Product details
Overview
LMR23630DRRR from Texas Instruments is a 36-V, 3-A synchronous step-down DC-DC converter in a 12-pin WSON package with wettable flanks and PowerPAD™ thermal pad. It operates from 4 V to 36 V input, delivers continuous 3-A output current, features peak-current-mode control with 60 ns minimum on-time, supports PFM/FPWM modes, and includes internal compensation for minimal external components. It is used in factory automation power supplies for PLC CPU rails.
For engineers reviewing the LMR23630DRRR datasheet, LMR23630DRRR pinout, LMR23630DRRR application, or LMR23630DRRR equivalent, key selection considerations include its adjustable switching frequency (200–2200 kHz via RT pin), 75 µA no-load quiescent current in PFM mode, precision enable input with 1.55 V typical threshold, hiccup-mode short-circuit protection, and thermal shutdown at 170 °C.
Technical Context
The LMR23630DRRR implements fixed-frequency peak-current-mode control with internal voltage-loop compensation, eliminating need for external loop components. Its RT pin enables precise frequency programming from 200 kHz to 2200 kHz using a single resistor to AGND - not present in fixed-frequency variants like LMR23630ADDA.
It integrates high-side and low-side NMOS power switches with RDS(on) of 160 mΩ (HS) and 95 mΩ (LS) at 12 V input, enabling high-efficiency operation across wide VIN range. The device supports soft-start into prebiased loads, precision enable with 0.4 V wake-up threshold and 0.4 V hysteresis, and power-good flag generation with 104–110% overvoltage and 92–96.5% undervoltage thresholds relative to 1 V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports industrial unregulated rails including 24 V DC systems and battery-backed inputs. |
| Output Current | 3 A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or sensor signal chains. |
| Switching Frequency | Adjustable 200–2200 kHz via RT pin - enables EMI optimization and inductor size reduction without layout change. |
| Quiescent Current | 75 µA in PFM mode - extends battery life in always-on industrial monitoring nodes. |
| Min. On-Time | 60 ns - allows high duty-cycle operation down to ~1.2 V output at 36 V input, critical for wide-VIN point-of-load conversion. |
| Thermal Shutdown | 170 °C with 15 °C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Reference Voltage | 1.0 V ±2% over –40°C to +125°C - ensures stable output regulation across automotive and industrial temperature ranges. |
Pinout & Package
LMR23630DRRR uses a 12-pin WSON (3.00 mm × 3.00 mm) package with wettable flanks and exposed thermal pad (Pin 9). The package supports automated optical inspection (AOI) and improves solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch node | Connects to inductor; carries high di/dt switching current - requires tight layout and Kelvin connection to minimize noise. |
| 2 (BOOT) | Bootstrap supply | Drives high-side gate; requires 100 nF–470 nF ceramic capacitor between BOOT and SW for reliable HS FET turn-on. |
| 3 (VCC) | Bias LDO output | Internal 4.1 V regulator; must be bypassed with 2.2 µF/16 V capacitor to AGND - no external load permitted. |
| 4 (FB) | Voltage feedback input | Senses output via resistor divider; 1 V reference enables accurate VOUT setting (e.g., 3.3 V with 232 kΩ/100 kΩ divider). |
| 5 (RT) | Frequency programming | Analog input to set fSW; open-circuit defaults to 400 kHz; 17.8 kΩ yields ~2200 kHz - not present on HSOIC variants. |
| 6 (EN/SYNC) | Enable & sync input | Active-high enable with 1.55 V threshold; accepts external clock (200–2200 kHz) via AC coupling for system-level timing synchronization. |
| 7 (AGND) | Analog ground | Reference for FB, EN, RT; must be connected to low-noise system ground plane, separate from PGND until star point. |
| 8 (VIN) | Main input supply | Accepts 4–36 V; requires local 10 µF+ ceramic input capacitor placed near pin to suppress high-frequency ripple. |
| 9 (PGND) | Power ground | Low-side FET source return; connects internally to thermal pad - must tie to solid copper pour under package. |
| 10 (PAD) | Thermal pad | Primary heat path to PCB; requires ≥6 thermal vias to inner ground plane for RθJA = 41.5 °C/W performance. |
| 11 (NC) | No connect | Not bonded - must remain floating; no trace or copper allowed. |
| 12 (PGOOD) | Power-good flag | Open-drain output asserting when VOUT is within ±3% of target; requires external pullup (10–100 kΩ) to logic rail ≤12 V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces conduction loss by >30% vs. asynchronous buck at 3 A, improving full-load efficiency to >92%. |
| Internal loop compensation | Removes need for external Type-II/III compensation network - cuts BOM count by 3–5 passive components and accelerates design validation. |
| Soft start into prebiased load | Prevents output overshoot when powering up partially charged rails (e.g., hot-swap systems or backup supplies), avoiding downstream IC latch-up. |
| Hiccup-mode short-circuit protection | Shuts down for 10 ms after 64 consecutive current-limit cycles - limits average fault power to <1 W, preventing thermal runaway during sustained shorts. |
| Wettable flank leads | Enables automated AOI of solder joints on bottom-side terminations - critical for high-reliability industrial assembly with IPC-A-610 Class 2/3 compliance. |
Applications
| PLC CPU Power Supply | HVAC Control Module |
|---|---|
Use Scenario: Powers 3.3 V core rail for ARM Cortex-M7-based programmable logic controller CPU in factory automation cabinet. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 24 V DC bus to tightly regulated 3.3 V at up to 2.5 A, with PGOOD signaling processor reset release. Use Value: 75 µA PFM quiescent current minimizes standby power draw during idle cycles; 60 ns min on-time supports 3.3 V output even during 36 V brownout conditions. | Use Scenario: Supplies 5 V rail for HVAC zone controller MCU, display interface, and analog sensor front-end in building management system. IC Role / Device Role / Timing Role: Wide-input buck converter accepting fluctuating 12–30 V field wiring; synchronized to system clock via EN/SYNC pin for deterministic EMI profile. Use Value: Adjustable 200–2200 kHz frequency avoids sensitive bands (e.g., 433 MHz ISM); FPWM mode ensures <15 mVpp output ripple for ADC reference stability. |
| Asset Tracking GPS Module | Industrial IoT Sensor Node |
Use Scenario: Powers GPS/GNSS receiver and LTE-M modem in battery-operated asset tracker deployed in remote logistics environments. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating from Li-ion (3.0–4.2 V) or 12 V vehicle supply; enables ultra-low-power sleep mode via precision enable pin. Use Value: 2 µA shutdown current extends shelf life; PFM mode maintains >85% efficiency at 100 µA load - critical for multi-year battery operation. | Use Scenario: Provides 3.3 V bias to MEMS accelerometer, temperature sensor, and LoRaWAN transceiver in predictive maintenance vibration monitor. IC Role / Device Role / Timing Role: Primary power stage with thermal shutdown and hiccup protection - withstands transient overloads from motor startup events in adjacent equipment. Use Value: 170 °C thermal shutdown with 15 °C hysteresis prevents damage during enclosure overheating; wettable flanks ensure solder joint integrity in thermal cycling environments. |
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 adds forced PWM (FPWM) mode - eliminates light-load frequency variation for EMI-sensitive designs. | Preferred where constant switching frequency is mandatory (e.g., EMC-compliant medical devices), not required for general industrial use. | Select LMR23630FDRR only if FPWM is needed; otherwise LMR23630DRRR offers identical baseline performance at lower cost. |
| LMR23625DDA | 8-pin HSOIC package, pin-compatible 2.5-A variant - shares same control architecture but lower current rating and fixed 400 kHz frequency. | Suitable for space-constrained layouts where thermal pad access is limited; lacks RT pin and PGOOD functionality. | Choose LMR23625DDA only if board area is critical and 2.5 A suffices; LMR23630DRRR provides higher current headroom and frequency flexibility. |
Compared with LMR23630FDRR, the LMR23630DRRR trades FPWM capability for cost and simplicity in PFM-dominant applications; compared with LMR23625DDA, it delivers 20% higher output current and full frequency adjustability in a thermally superior WSON package with wettable flanks.
Availability
LMR23630DRRR is available at Aetrix Electronics and suitable for factory automation systems, HVAC control modules, asset tracking devices, and industrial IoT sensor nodes requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LMR23630DRRR 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 and automotive electronics.
The LMR23630DRRR belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC-DC converters, designed specifically for rugged industrial power conditioning where wide input range, thermal robustness, and minimal external components are essential.
FAQ
What is the maximum input voltage rating for the LMR23630DRRR?
The LMR23630DRRR 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 internal VIN undervoltage lockout or reduce reliability; sustained exposure to 42 V is not advised per datasheet Section 7.1 Absolute Maximum Ratings.
Does the LMR23630DRRR support synchronization to an external clock?
Yes, the LMR23630DRRR supports frequency synchronization via its EN/SYNC pin, accepting external clock signals from 200 kHz to 2200 kHz. A small AC-coupling capacitor injects the sync pulse, and the internal oscillator locks to the external frequency - confirmed in Section 7.7 Switching Characteristics and Figure 8-2 of the datasheet.
What is the purpose of the RT pin on the LMR23630DRRR?
The RT pin on the LMR23630DRRR sets the switching frequency by connecting a resistor to AGND; resistance values from 17.8 kΩ to 198 kΩ program frequencies from 2200 kHz down to 200 kHz. Leaving RT open defaults to 400 kHz - this pin is absent on HSOIC variants like LMR23630ADDA and defines the DRR/FDRR part numbering suffix.
Can the LMR23630DRRR operate with a prebiased output voltage?
Yes, the LMR23630DRRR supports soft start into a prebiased load, preventing output overshoot when powering up circuits with stored charge (e.g., downstream capacitors or powered peripherals). This behavior is enabled by internal circuitry that monitors FB voltage during startup and adjusts ramp rate accordingly - detailed in Section 8.3.10 of the datasheet.
What thermal management features does the LMR23630DRRR include?
The LMR23630DRRR includes thermal shutdown at 170 °C with 15 °C hysteresis, junction-to-board thermal resistance of 16.3 °C/W (RθJB), and a dedicated thermal pad (Pin 9) requiring ≥6 vias to inner ground plane. These features collectively enable 3 A continuous operation at +85 °C ambient with proper PCB layout - verified in Section 7.4 Thermal Information and Figure 11-4 Layout Example.
LMR23630DRRR 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)
LMR23630DRRR FAQ
1.How can I place an order for LMR23630DRRR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR23630DRRR 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 LMR23630DRRR reliable?
The price and inventory of LMR23630DRRR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR23630DRRR is usually 5 days.
3.What payment methods are accepted for LMR23630DRRR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR23630DRRR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR23630DRRR?
LMR23630DRRR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR23630DRRR 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 LMR23630DRRR?
For technical support, including LMR23630DRRR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR23630DRRR requirements.
6.How does Aetrix verify that LMR23630DRRR is sourced from the original manufacturer or authorized distributors?
All LMR23630DRRR 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 LMR23630DRRR meets industry standards.
7.What is the process for return or replacement of LMR23630DRRR?
All LMR23630DRRR units undergo pre-shipment inspection (PSI). If there is an issue with LMR23630DRRR, 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 LMR23630DRRR part is unused and in its original packaging.
Return procedure for LMR23630DRRR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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