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Texas Instruments LMR23630ADDA
- Part No.:
- LMR23630ADDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR23630ADDA.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,722
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Product details
Overview
LMR23630ADDA 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, employs peak-current-mode control with internal compensation, and supports PFM/FPWM operation for high efficiency or low ripple. Used in PLC CPU power supplies and HVAC control systems.
For engineers reviewing the LMR23630ADDA datasheet, LMR23630ADDA pinout, LMR23630ADDA application, or LMR23630ADDA equivalent, key selection criteria include its fixed 400-kHz switching frequency, 75-µA no-load quiescent current, precision enable input, integrated synchronous rectification, and thermal protection - all validated for industrial wide-VIN regulation.
Technical Context
The LMR23630ADDA uses fixed-frequency peak-current-mode control with internal loop compensation, eliminating external compensation components. Its 60-ns minimum on-time enables high duty-cycle operation down to ~1 V output at 36 V input.
It integrates high-side and low-side NMOS FETs (RDS(on) = 185 mΩ / 105 mΩ), features a precision 1-V reference (±2% over temperature), and supports hiccup-mode short-circuit protection with 64-cycle fault detection and 5-ms retry delay in HSOIC packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports unregulated industrial rails including 24-V and 36-V battery/supply systems. |
| Output Current | 3 A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or sensor subsystems. |
| Switching Frequency | Fixed 400 kHz - enables compact magnetics and predictable EMI filtering without RT resistor layout. |
| Quiescent Current | 75 µA in PFM mode - extends battery life in always-on industrial monitoring nodes. |
| Enable Threshold | 1.55 V typical rising threshold with 0.4 V hysteresis - allows clean power sequencing with standard logic-level signals. |
| Thermal Shutdown | 170 °C typical with 15 °C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Min. On-Time | 60 ns - supports high step-down ratios (e.g., 36 V → 3.3 V) without pulse-skipping instability. |
Pinout & Package
LMR23630ADDA is housed in an 8-pin HSOIC (4.89 mm × 3.90 mm) with exposed PowerPAD™ thermal pad for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Connects to inductor; carries high di/dt switching current - requires short, low-inductance trace to minimize EMI. |
| BOOT | Bootstrap supply | Drives high-side gate; requires 100 nF–470 nF ceramic capacitor between BOOT and SW for reliable high-side turn-on. |
| VCC | Bias LDO output | Internally generates ~4.1 V; must be bypassed with 2.2-µF/16-V capacitor to AGND - no external load permitted. |
| FB | Feedback input | Senses output via resistor divider; references internal 1-V precision bandgap - sets VOUT = 1 V × (1 + RFBB/RFBT). |
| VIN | Main input supply | Accepts 4–36 V; connects to bulk input capacitor - shortest possible path to PGND minimizes voltage spikes. |
| PGND | Power ground | Low-side FET source return; must tie directly to CIN and COUT grounds and thermal pad for optimal thermal and EMI performance. |
| EN/SYNC | Enable & sync input | Active-high enable with undervoltage lockout; also accepts external 200–2200 kHz clock for synchronization - no pull-up required. |
| AGND | Analog ground | Reference for FB, EN, and internal circuits; must connect to PGND at single point near IC to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces conduction loss and improves full-load efficiency by ~3–5% vs. asynchronous designs. |
| Internal compensation | Removes need for external Type-II/III compensation network - cuts BOM count and simplifies layout for stable operation across 10× output capacitance range. |
| Soft start into prebiased load | Prevents reverse current flow when enabling into powered output rail - essential for hot-swap and redundant supply applications. |
| PFM and FPWM mode options | PFM maximizes light-load efficiency (>85% at 1 mA); FPWM maintains constant frequency and <15-mVpp ripple at all loads - selectable via part number variant. |
| Precision enable input | 1.55-V threshold with 0.4-V hysteresis enables direct interface with 1.8-V/3.3-V GPIO - avoids level-shifter complexity in multi-rail sequencing. |
Applications
| PLC CPU Power Supply | HVAC Control Unit |
|---|---|
Use Scenario: Powers ARM Cortex-M7-based PLC main processor and peripheral I/O from 24-V factory bus. IC Role / Device Role / Timing Role: Primary 3.3-V/3-A buck regulator delivering core logic voltage with tight load regulation (<±1.5% from 0–3 A). Use Value: 75-µA PFM quiescent current extends uptime during standby; 400-kHz fixed frequency simplifies EMI filter design for CE-compliant industrial enclosures. | Use Scenario: Supplies 5-V rail for HVAC controller MCU, display driver, and CAN transceiver from fluctuating 24-V HVAC bus. IC Role / Device Role / Timing Role: Wide-input buck converter maintaining stable 5-V output despite ±20% input variation and 100-ms brownouts. Use Value: 60-ns min on-time ensures regulation down to 5 V even at 36-V max input; hiccup-mode protection prevents latch-up during motor startup surges. |
| Asset Tracking Node | General Purpose Wide VIN Regulation |
Use Scenario: Powers GPS/GSM module and ultra-low-power MCU in battery-operated logistics tracker with solar-assisted charging. IC Role / Device Role / Timing Role: Primary system regulator converting variable 6–30-V solar/battery input to 3.3-V MCU rail with minimal no-load draw. Use Value: 2-µA shutdown current preserves battery during months of dormancy; soft-start into prebiased load prevents disruption when solar panel reconnects. | Use Scenario: Provides 12-V intermediate rail from 24-V or 36-V industrial power bus for analog sensors, op-amps, and isolated gate drivers. IC Role / Device Role / Timing Role: High-efficiency step-down stage delivering up to 3 A with <1% load regulation and <50-mV line regulation over full input range. Use Value: Integrated MOSFETs and internal compensation reduce solution size to <150 mm² - fits compact DIN-rail mounted modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR23630AFDDA | Same HSOIC-8 package, identical specs except adds FPWM mode support via dedicated PGOOD pin function. | Required where constant-frequency operation and power-good signaling are both needed - e.g., FPGA configuration sequencing. | Select LMR23630AFDDA if FPWM mode and PGOOD flag are mandatory; otherwise LMR23630ADDA offers simpler enable-only control. |
| LMR23625ADDA | Pin-to-pin compatible HSOIC-8 variant rated for 2.5 A; shares same 400-kHz frequency, 75-µA IQ, and thermal characteristics. | Suitable for lower-current applications (≤2.5 A) where margin or cost optimization is prioritized over 3-A headroom. | Choose LMR23625ADDA when load current is confirmed ≤2.5 A - reduces thermal stress and may improve light-load efficiency. |
Compared with LMR23630AFDDA, LMR23630ADDA omits PGOOD and FPWM capability but retains identical thermal performance and footprint; versus LMR23625ADDA, it provides 0.5-A higher current rating with no layout change - enabling scalable design reuse across product tiers.
Availability
LMR23630ADDA is available at Aetrix Electronics and suitable for factory automation systems, building HVAC controllers, and asset tracking devices requiring stable component supply across long production lifecycles.
Supply support for LMR23630ADDA 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 broad industrial and automotive focus.
The LMR23630ADDA belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC-DC regulators, designed specifically for robust, low-risk power conversion in harsh industrial environments with wide input ranges and minimal external components.
FAQ
What is the switching frequency of the LMR23630ADDA?
The LMR23630ADDA operates at a fixed 400 kHz switching frequency. This value is factory-programmed and cannot be adjusted via external resistor or sync signal - unlike WSON variants with RT or SYNC pins. The fixed frequency simplifies EMI filter design and eliminates tuning effort during layout.
Does the LMR23630ADDA support power-good indication?
No, the LMR23630ADDA does not provide a power-good (PGOOD) output. That function is available only on variants such as LMR23630AFDDA (HSOIC with PGOOD) or LMR23630APDRR (WSON with PGOOD). The LMR23630ADDA lacks the dedicated open-drain PGOOD pin and associated internal circuitry.
What is the maximum output voltage achievable with the LMR23630ADDA?
The LMR23630ADDA supports output voltages from 1 V to 28 V, set by an external resistor divider on the FB pin referencing its internal 1-V precision bandgap. Output accuracy is ±2% over temperature and line/load conditions, making it suitable for 3.3-V, 5-V, and 12-V rails in industrial systems.
How does the LMR23630ADDA handle short-circuit conditions?
The LMR23630ADDA implements hiccup-mode short-circuit protection: upon detecting 64 consecutive valley-current-limit events, it shuts down for 5 ms before retrying. This limits average fault power, prevents thermal runaway, and avoids latch-up - critical for unattended industrial equipment where sustained shorts may occur.
Can the LMR23630ADDA be synchronized to an external clock?
No, the LMR23630ADDA does not support external clock synchronization. Its EN/SYNC pin functions solely as an enable input with undervoltage lockout; it lacks the internal sync detection circuitry present in RT- or PGOOD-equipped variants like LMR23630DRR or LMR23630FDRR.
LMR23630ADDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LMR23630ADDA FAQ
1.How can I place an order for LMR23630ADDA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR23630ADDA 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 LMR23630ADDA reliable?
The price and inventory of LMR23630ADDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR23630ADDA is usually 5 days.
3.What payment methods are accepted for LMR23630ADDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR23630ADDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR23630ADDA?
LMR23630ADDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR23630ADDA 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 LMR23630ADDA?
For technical support, including LMR23630ADDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR23630ADDA requirements.
6.How does Aetrix verify that LMR23630ADDA is sourced from the original manufacturer or authorized distributors?
All LMR23630ADDA 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 LMR23630ADDA meets industry standards.
7.What is the process for return or replacement of LMR23630ADDA?
All LMR23630ADDA units undergo pre-shipment inspection (PSI). If there is an issue with LMR23630ADDA, 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 LMR23630ADDA part is unused and in its original packaging.
Return procedure for LMR23630ADDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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