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Texas Instruments LMR23625CDDAR
- Part No.:
- LMR23625CDDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR23625CDDAR.pdf
- Description:
- IC REG BUCK ADJ 2.5A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:5,004
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Product details
Overview
LMR23625CDDAR 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 PFM and forced-PWM modes at 2.1 MHz, features internal compensation, 75-µA quiescent current, and precision enable for power sequencing - used in PLC CPU power rails and HVAC control systems.
For engineers reviewing the LMR23625CDDAR datasheet, LMR23625CDDAR pinout, LMR23625CDDAR application, or LMR23625CDDAR equivalent, key selection factors include input voltage range (4–36 V), continuous output current (2.5 A), switching frequency options (2.1 MHz fixed or sync-capable), thermal performance (RθJA = 42.0°C/W), and integrated protection including hiccup-mode short-circuit and thermal shutdown.
Technical Context
The LMR23625CDDAR employs fixed-frequency peak-current-mode control with internal loop compensation, eliminating external compensation components. Its dual-mode operation (PFM for light-load efficiency, forced-PWM for low ripple and constant frequency) is selectable via EN/SYNC pin configuration.
It integrates high-side and low-side MOSFETs (RDS(on) = 185 mΩ / 105 mΩ), supports synchronization to external clocks from 200 kHz to 2.2 MHz, and includes precision enable with 1.55-V typical threshold and 0.4-V hysteresis - enabling robust system-level power sequencing and UVLO control.
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 unregulated battery/supply inputs. |
| Output Current | 2.5 A continuous - sufficient for powering microcontrollers, FPGAs, and analog subsystems in automation equipment. |
| Switching Frequency | 2.1 MHz (fixed) - enables compact magnetics and EMI filtering; supports external sync up to 2.2 MHz for noise-sensitive applications. |
| Quiescent Current | 75 µA in PFM mode - extends battery life in always-on industrial sensors and remote monitoring nodes. |
| Enable Threshold | 1.55 V typical rising threshold with 0.4 V hysteresis - allows precise system-level UVLO setting using resistor dividers. |
| Thermal Resistance | RθJA = 42.0°C/W (HSOIC) - requires minimal PCB copper area for thermal management in space-constrained enclosures. |
| Minimum ON Time | 60 ns - supports high-duty-cycle operation down to ~12% VOUT/VIN, enabling 3.3-V output from 24-V input without external components. |
Pinout & Package
LMR23625CDDAR uses the 8-pin HSOIC (DDA) package with exposed thermal pad (PowerPAD™), measuring 4.89 mm × 3.90 mm. The thermal pad must be soldered to a PCB ground plane for effective heat dissipation and electrical grounding.
| 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 100–470 nF ceramic capacitor between BOOT and SW for reliable gate drive. |
| 3 VCC | Bias supply output | Internal LDO output (4.1 V); bypass with 2.2-µF/16-V capacitor to AGND - no external load permitted. |
| 4 FB | Voltage feedback input | Monitors output via resistor divider; reference voltage = 1.0 V ±1.5% - sets output accuracy and stability. |
| 5 EN/SYNC | Enable & sync input | Logic-controlled start-up and external clock synchronization; supports UVLO programming and system sequencing. |
| 6 AGND | Analog ground | Reference for internal references and feedback circuitry - must connect to clean ground plane, separate from PGND if possible. |
| 7 VIN | Main input supply | Accepts 4–36 V; requires local 10-µF ceramic input capacitor placed near pin for transient suppression. |
| 8 PGND | Power ground | Low-side MOSFET source return; connects internally to thermal pad - must tie directly to CIN, COUT, and AGND with low-impedance path. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces conduction losses and improves full-load efficiency by >3% vs. asynchronous designs. |
| Internal compensation | Removes need for external Type-II/III compensation network - cuts BOM count, simplifies layout, and ensures stable operation across all output capacitors. |
| Soft-start into prebiased load | Prevents output voltage overshoot when powering already-charged rails - critical for hot-swap and multi-rail sequencing in PLC backplanes. |
| Hiccup-mode short-circuit protection | Shuts down on sustained overload, then retries after 5 ms - protects MOSFETs and inductor during fault conditions without latch-up. |
| Power-good flag (PGOOD) | Open-drain output indicating valid regulation within ±4% of target - enables downstream logic enable and system health monitoring. |
Applications
| PLC CPU Power Supply | HVAC Control Module |
|---|---|
Use Scenario: Powers ARM Cortex-M7 MCU and peripheral I/O in programmable logic controller rack units operating from 24-V industrial bus. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 3.3 V/2.5 A with tight load regulation (<±1%) and fast transient response. Use Value: Enables reliable operation under 24-V brownout (down to 4 V input) and maintains regulation during 1-A step load transients with <50-mV deviation. | Use Scenario: Supplies 5-V rail for temperature sensor interface, fan motor driver logic, and wireless telemetry in commercial HVAC controllers. IC Role / Device Role / Timing Role: Wide-input buck converter supporting both AC/DC adapter (12–24 V) and backup battery (9–36 V) inputs. Use Value: Delivers 75-µA quiescent current in PFM mode to extend 3.6-V Li-ion backup runtime beyond 72 hours during mains outage. |
| GSM/GPRS Fleet Telemetry Unit | Factory Automation Sensor Node |
Use Scenario: Powers GSM modem, GPS receiver, and microcontroller in vehicle-mounted telematics devices powered by automotive battery (9–16 V nominal, up to 36 V load dump). IC Role / Device Role / Timing Role: Input-transient-hardened DC-DC stage with 42-V absolute max rating and hiccup-mode protection against shorted antenna lines. Use Value: Survives ISO 7637-2 pulse 5a (36 V/100 ms) without latch-up or output collapse - eliminates need for upstream TVS clamping. | Use Scenario: Powers ultra-low-power industrial IoT sensor (temperature, vibration, humidity) with BLE radio in sealed enclosure powered by 24-V fieldbus. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in PFM mode at sub-mA loads, synchronized to BLE transmit bursts. Use Value: Achieves >85% efficiency at 100-µA load (PFM) and switches to FPWM only during radio transmission - minimizes average power draw. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR23625CFDDA | Same HSOIC-8 package but adds forced-PWM mode only (no PFM option); identical electrical specs otherwise. | Suitable where constant frequency and lowest output ripple are mandatory - e.g., RF subsystems or ADC reference supplies. | Select LMR23625CFDDA when PFM-induced frequency variation is unacceptable, and accept slightly higher light-load current (≈100 µA vs. 75 µA). |
| LMR23630CDDAR | 3-A version in pin-compatible HSOIC-8 package; shares same footprint, control architecture, and feature set. | Used when future-proofing for higher current loads or derating for extended thermal margin in high-ambient environments. | Choose LMR23630CDDAR if design may scale to >2.5 A or requires >20% thermal headroom at 125°C ambient. |
Compared with LMR23625CFDDA, the LMR23625CDDAR offers superior light-load efficiency via PFM mode but trades off ripple performance; versus LMR23630CDDAR, it provides optimal cost and thermal balance for 2.5-A applications without overdesign.
Availability
LMR23625CDDAR is available at Aetrix Electronics and suitable for factory automation systems, building HVAC controls, and GSM/GPRS telemetry units requiring stable component supply across long production lifecycles.
Supply support for LMR23625CDDAR 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 industrial-grade DC-DC conversion.
The LMR23625CDDAR belongs to TI's SIMPLE SWITCHER® family - designed specifically for rugged, easy-to-deploy power solutions in factory automation, building control, and transportation systems where reliability and design simplicity are critical.
FAQ
What is the maximum input voltage rating for the LMR23625CDDAR?
The LMR23625CDDAR has an absolute maximum input voltage rating of 42 V, with recommended operating range from 4 V to 36 V. This allows safe operation during automotive load-dump events (ISO 7637-2 Pulse 5a) and industrial 24-V rail transients. Exceeding 42 V risks permanent damage per the Absolute Maximum Ratings table in the datasheet.
Does the LMR23625CDDAR support external frequency synchronization?
Yes, the LMR23625CDDAR supports external clock synchronization via its EN/SYNC pin, accepting AC-coupled signals from 200 kHz to 2.2 MHz. This capability enables noise-sensitive applications - such as those with ADCs or RF modules - to lock switching frequency away from critical bands, reducing conducted EMI and improving system signal integrity.
What is the purpose of the thermal pad on the LMR23625CDDAR package?
The exposed thermal pad on the LMR23625CDDAR's HSOIC package serves as the primary heat dissipation path and must be soldered to a PCB ground plane. It connects internally to PGND and provides RθJC(bot) = 3.6°C/W, significantly lowering junction temperature. Omitting thermal pad connection degrades thermal performance by >25°C at full load and violates TI's recommended layout guidelines.
Can the LMR23625CDDAR operate with a prebiased output voltage?
Yes, the LMR23625CDDAR supports soft-start into a prebiased output, preventing reverse current flow and output overshoot when powering rails already charged by other sources. This behavior is enabled by internal zero-cross detection and valley current limiting, making it suitable for hot-swap and multi-source power architectures common in PLC backplanes and redundant power systems.
How does the LMR23625CDDAR handle short-circuit faults?
The LMR23625CDDAR implements hiccup-mode short-circuit protection: upon detecting sustained overcurrent (64 consecutive cycles of valley current limit), it shuts down for 5 ms before retrying. This prevents thermal runaway while allowing automatic recovery - unlike latch-off protection, which requires external reset. The hiccup interval is fixed for the HSOIC package and differs from the WSON variant's 10-ms delay.
LMR23625CDDAR 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
LMR23625CDDAR FAQ
1.How can I place an order for LMR23625CDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR23625CDDAR 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 LMR23625CDDAR reliable?
The price and inventory of LMR23625CDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR23625CDDAR is usually 5 days.
3.What payment methods are accepted for LMR23625CDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR23625CDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR23625CDDAR?
LMR23625CDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR23625CDDAR 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 LMR23625CDDAR?
For technical support, including LMR23625CDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR23625CDDAR requirements.
6.How does Aetrix verify that LMR23625CDDAR is sourced from the original manufacturer or authorized distributors?
All LMR23625CDDAR 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 LMR23625CDDAR meets industry standards.
7.What is the process for return or replacement of LMR23625CDDAR?
All LMR23625CDDAR units undergo pre-shipment inspection (PSI). If there is an issue with LMR23625CDDAR, 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 LMR23625CDDAR part is unused and in its original packaging.
Return procedure for LMR23625CDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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