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Texas Instruments LMR23625CFDDAR
- Part No.:
- LMR23625CFDDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR23625CFDDAR.pdf
- Description:
- IC REG BUCK ADJ 2.5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR23625CFDDAR from Texas Instruments is a 36-V, 2.5-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 fixed 2.1-MHz forced-PWM operation, integrates synchronous rectification and internal compensation, and targets industrial power conditioning for PLC CPU and HVAC control systems.
For engineers reviewing the LMR23625CFDDAR datasheet, LMR23625CFDDAR pinout, LMR23625CFDDAR application, or LMR23625CFDDAR equivalent, key selection criteria include its 2.5-A continuous output, 75-µA no-load quiescent current, 60-ns minimum on-time, precision enable input, and hiccup-mode short-circuit protection - all validated for wide-VIN industrial environments.
Technical Context
The LMR23625CFDDAR uses fixed-frequency peak-current-mode control with internal loop compensation, eliminating external compensation components. Its 2.1-MHz switching frequency operates exclusively in forced-PWM (FPWM) mode - no PFM option - ensuring constant frequency and low output-voltage ripple across load conditions.
It integrates high-side and low-side MOSFETs (RDS(on) = 185 mΩ / 105 mΩ), features a precision 1-V reference (±2% over –40°C to +125°C), and supports synchronization to external clocks from 200 kHz to 2.2 MHz via the EN/SYNC pin. Thermal shutdown triggers at 170°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - supports direct regulation from unregulated industrial rails including 24-V DC systems and automotive battery inputs. |
| Output Current | 2.5 A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, and sensor signal chains in factory automation. |
| Switching Frequency | 2.1 MHz (fixed, FPWM only) - enables compact magnetics and reduces EMI filtering requirements in space-constrained PCB layouts. |
| Quiescent Current | 75 µA in PFM mode - not applicable to LMR23625CFDDAR; this variant is FPWM-only, so actual operating IQ is higher but ensures stable light-load regulation. |
| Min. On-Time | 60 ns - allows high duty-cycle operation down to ~1.7 V output at 36 V input, supporting wide VIN-to-VOUT conversion ratios. |
| Reference Voltage | 1.0 V ±2% (–40°C to +125°C) - enables accurate output setting (e.g., 3.3 V or 5 V) using standard 1% feedback resistors without trimming. |
| Shutdown Current | 2 µA typical - extends battery life in always-on monitoring nodes when disabled via EN/SYNC pin. |
Pinout & Package
LMR23625CFDDAR uses an 8-pin HSOIC package (4.89 mm × 3.90 mm) with exposed thermal pad (PowerPAD™) for enhanced heat dissipation. The package requires solder connection of the thermal pad to a dedicated PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch node | Connects to power inductor; carries high di/dt switching current - requires short, low-inductance trace routing. |
| 2 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100 nF–470 nF ceramic capacitor between BOOT and SW. |
| 3 VCC | Internal LDO output | Provides bias for control circuitry; must be bypassed with 2.2-µF/16-V capacitor to AGND - no external load permitted. |
| 4 FB | Feedback input | Senses output voltage divider midpoint; high-impedance analog input - keep trace short and away from noise sources. |
| 5 EN/SYNC | Enable & sync input | Logic-level enable (1.55 V threshold); also accepts AC-coupled external clock (200–2200 kHz) for synchronization. |
| 6 AGND | Analog ground | Reference for internal references and logic; connect directly to system ground plane with low-impedance path. |
| 7 VIN | Input supply | Primary power input (4–36 V); place bulk and high-frequency input capacitors as close as possible to this pin and PGND. |
| 8 PGND | Power ground | Low-side MOSFET source connection; tie to AGND, thermal pad, CIN, and COUT grounds with minimal loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Forced-PWM (FPWM) mode only | Eliminates frequency variation at light loads, ensuring predictable EMI profile and tight output voltage regulation (±1%) across full load range. |
| Integrated synchronous MOSFETs | Reduces external component count by two discrete FETs and associated gate drivers; RDS(on) values optimized for 2.5-A continuous conduction. |
| Internal compensation | Removes need for external Type-II/III compensation network - simplifies design, accelerates prototyping, and improves stability with common ceramic output capacitors. |
| Precision enable input | 1.55-V typical threshold with 0.4-V hysteresis enables reliable system power sequencing and custom UVLO using resistor dividers on EN/SYNC. |
| Hiccup-mode short-circuit protection | Trips after 64 consecutive valley-current-limit events, then retries every 5 ms - prevents thermal runaway while allowing automatic recovery after fault removal. |
Applications
| PLC CPU Power Supply | HVAC Control Unit |
|---|---|
Use Scenario: Powers ARM Cortex-M7-based CPU and DDR memory interface in modular programmable logic controllers operating from 24-V DC field bus. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering stable 1.2-V core and 3.3-V I/O rails with fast transient response to CPU burst loads. Use Value: 2.1-MHz FPWM operation maintains <±10 mV output deviation during 2-A step transients, reducing need for large output capacitance. |
Use Scenario: Supplies 5-V rail for microcontroller, display driver, and relay interface in commercial building HVAC controllers exposed to 36-V surge transients. IC Role / Device Role / Timing Role: Wide-input buck converter handling brownouts and surges while maintaining uninterrupted operation during AC line dips. Use Value: 4-V UVLO rising threshold and 0.4-V hysteresis prevent erratic cycling during marginal input conditions; thermal shutdown protects against enclosure overheating. |
| GSM/GPRS Fleet Telematics | Industrial Sensor Node |
Use Scenario: Regulates battery-backed 12-V nominal supply to 3.3-V for LTE-M modem, GPS receiver, and CAN transceiver in vehicle tracking units. IC Role / Device Role / Timing Role: High-efficiency, low-noise power stage enabling >90% efficiency at 500-mA load while meeting CISPR-25 Class 3 EMI limits. Use Value: 60-ns minimum on-time supports 3.3-V output from 12-V input at >27% duty cycle - avoids sub-harmonic instability in current-mode control. |
Use Scenario: Powers ultra-low-power MCU, analog front-end, and LoRaWAN radio in battery-operated predictive maintenance sensors deployed in factories. IC Role / Device Role / Timing Role: Always-on regulator with 2-µA shutdown current, enabling multi-year battery life when host MCU enters deep sleep. Use Value: Precision enable input allows MCU to assert EN/SYNC only during active measurement cycles - eliminates standby leakage through feedback divider. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR23625CDDA | Same HSOIC-8 package and 2.1-MHz fixed frequency, but lacks FPWM capability - operates in PFM mode only. | Higher light-load efficiency but larger output ripple and variable frequency; unsuitable for EMI-sensitive or timing-critical systems. | Select LMR23625CDDA only if lowest quiescent current (75 µA) is prioritized over ripple and EMI predictability. |
| LMR23630CFDDA | Pin-compatible 3-A version with identical FPWM mode, same 2.1-MHz frequency, and extended current capability. | Supports higher-power loads (e.g., dual-core MCUs or Ethernet PHYs) without layout change - ideal for scalable platform designs. | Choose LMR23630CFDDA when future-proofing for >2.5-A peak loads or when margin is required for thermal derating in enclosed enclosures. |
Compared with LMR23625CDDA, LMR23625CFDDAR trades light-load efficiency for deterministic EMI and tighter regulation; compared with LMR23630CFDDA, it offers lower cost and thermal footprint for 2.5-A maximum applications without overdesign.
Availability
LMR23625CFDDAR is available at Aetrix Electronics and suitable for factory automation systems, HVAC control units, and GSM/GPRS telematics requiring stable component supply, long-term industrial lifecycle support, and consistent parametric performance across temperature extremes.
Supply support for LMR23625CFDDAR 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 and automotive power solutions.
The LMR23625CFDDAR belongs to TI's SIMPLE SWITCHER® family - engineered for ease of use in wide-input industrial power supplies, emphasizing integrated functionality, robust protection, and simplified layout over raw efficiency optimization.
FAQ
What is the switching frequency configuration of LMR23625CFDDAR?
The LMR23625CFDDAR operates exclusively in forced-PWM (FPWM) mode at a fixed 2.1-MHz switching frequency. Unlike other variants such as LMR23625CDDA, it does not support pulse-frequency modulation (PFM). This ensures constant frequency operation, low output-voltage ripple, and predictable EMI behavior across all load conditions - critical for noise-sensitive industrial applications. The LMR23625CFDDAR datasheet confirms FPWM-only functionality in the Device Comparison Table and Section 7.1.
Does LMR23625CFDDAR support external frequency synchronization?
Yes, LMR23625CFDDAR supports external clock synchronization via the EN/SYNC pin. An AC-coupled external clock signal (200 kHz to 2.2 MHz) can be injected through a small coupling capacitor to align the internal oscillator, enabling coherent switching across multiple converters in a system. This capability is documented in Section 7.3.3 and Electrical Characteristics Table 6.7, where fSYNC range and timing parameters are specified. No additional pins or configuration registers are required.
What is the thermal pad connection requirement for LMR23625CFDDAR?
The LMR23625CFDDAR HSOIC package includes an exposed thermal pad (PowerPAD™) that must be soldered to a dedicated PCB copper pour connected to PGND. This pad serves as the primary heat dissipation path and contributes significantly to the device's thermal resistance (RθJA = 42.0°C/W). TI recommends using ≥4 thermal vias (0.3-mm diameter) under the pad, filled or capped, connecting to an inner-layer ground plane. Failure to properly connect the thermal pad risks junction temperature exceeding 125°C under 2.5-A load.
How does the enable function work on LMR23625CFDDAR?
The EN/SYNC pin on LMR23625CFDDAR provides both enable control and synchronization input. It has a precise 1.55-V typical rising threshold and 0.4-V hysteresis, allowing clean startup/shutdown and custom UVLO implementation using resistor dividers. When pulled below 1 V, the device enters shutdown with 2-µA quiescent current. TI specifies strict non-floating requirements - the pin must never be left open. Direct connection to VIN enables self-startup, while MCU GPIO or system supervisor signals enable controlled sequencing.
What protection features are integrated into LMR23625CFDDAR?
LMR23625CFDDAR integrates five key protections: (1) cycle-by-cycle peak current limiting (HS limit: 4.8 A typ), (2) hiccup-mode short-circuit protection triggered after 64 current-limit events, (3) thermal shutdown at 170°C with 15°C hysteresis, (4) input undervoltage lockout (VIN_UVLO rising threshold: 3.7 V), and (5) VCC undervoltage lockout (rising threshold: 3.2 V). These are fully documented in Sections 6.5 and 7.3.1–7.3.4 of the datasheet and require no external components to activate.
LMR23625CFDDAR 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):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR23625CFDDAR FAQ
1.How can I place an order for LMR23625CFDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR23625CFDDAR 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 LMR23625CFDDAR reliable?
The price and inventory of LMR23625CFDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR23625CFDDAR is usually 5 days.
3.What payment methods are accepted for LMR23625CFDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR23625CFDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR23625CFDDAR?
LMR23625CFDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR23625CFDDAR 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 LMR23625CFDDAR?
For technical support, including LMR23625CFDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR23625CFDDAR requirements.
6.How does Aetrix verify that LMR23625CFDDAR is sourced from the original manufacturer or authorized distributors?
All LMR23625CFDDAR 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 LMR23625CFDDAR meets industry standards.
7.What is the process for return or replacement of LMR23625CFDDAR?
All LMR23625CFDDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR23625CFDDAR, 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 LMR23625CFDDAR part is unused and in its original packaging.
Return procedure for LMR23625CFDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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