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Texas Instruments LMR23625CFPDRRT
- Part No.:
- LMR23625CFPDRRT
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LMR23625CFPDRRT.pdf
- Description:
- IC REG BUCK ADJ 2.5A 12SON
- Quantity:
- Payment:
- Shipping:
Inventory:6,455
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Product details
Overview
LMR23625CFPDRRT from Texas Instruments is a 36-V, 2.5-A synchronous step-down DC-DC converter in a 12-pin WSON wettable flanks package with PowerPAD™. It delivers regulated output from 4 V to 36 V input, supports fixed 2.1-MHz forced-PWM operation, integrates high- and low-side MOSFETs (RDS(on) = 160 mΩ / 95 mΩ), and features PGOOD flag, precision enable, and hiccup-mode short-circuit protection. It is used in factory automation PLC CPU power supplies.
For engineers reviewing the LMR23625CFPDRRT datasheet, LMR23625CFPDRRT pinout, LMR23625CFPDRRT application, or LMR23625CFPDRRT equivalent, key selection considerations include its 2.1-MHz FPWM-only operation, 12-pin WSON thermal performance (RθJA = 41.5°C/W), integrated PGOOD, 75-μA quiescent current, and compatibility with wide-VIN industrial power conditioning.
Technical Context
The LMR23625CFPDRRT employs fixed-frequency peak-current-mode control with internal loop compensation, eliminating external compensation components. Its architecture includes integrated high- and low-side NMOS switches, a precision 1-V reference (±2% over –40°C to +125°C), and dedicated EN/SYNC pin supporting both enable sequencing and external clock synchronization (200 kHz–2.2 MHz).
It operates exclusively in forced-PWM mode - unlike HSOIC variants - ensuring constant 2.1-MHz switching, minimal output voltage ripple at light load, and predictable EMI behavior. The device integrates a 4.1-V internal LDO for bias, supports soft-start into prebiased loads, and implements cycle-by-cycle current limiting with valley/peak thresholds (4.0–6.6 A HS/LS limits) and thermal shutdown at 162–178°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 36 V - enables direct regulation from unregulated 12/24-V industrial rails or automotive batteries without pre-regulation. |
| Output Current | 2.5 A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or sensor signal chains in embedded systems. |
| Switching Frequency | 2.1 MHz (fixed, FPWM only) - allows use of small 2.2-µH inductors and compact 47-µF ceramic output capacitors, reducing solution footprint. |
| Quiescent Current | 75 µA in PFM-equivalent light-load state - extends battery life in always-on monitoring nodes without sacrificing startup speed. |
| PGOOD Output | Open-drain flag with 92–110% VREF trip thresholds - provides reliable system-level power sequencing and fault detection for downstream logic. |
| Thermal Resistance | RθJA = 41.5°C/W (WSON) - enables 2.5-A operation at +85°C ambient with standard 2-layer PCB and thermal pad soldering. |
| Minimum ON Time | 60 ns - supports high-duty-cycle operation down to ~1.7 V output at 36 V input, critical for low-VOUT industrial interfaces. |
Pinout & Package
LMR23625CFPDRRT uses a 12-pin WSON (DRR) package (3.0 mm × 3.0 mm) with wettable flanks and exposed thermal pad. The package supports automated optical inspection (AOI) and improves solder joint reliability in high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SW | Switch node connecting internal high- and low-side MOSFETs; requires low-inductance path to power inductor. |
| 3 | BOOT | Bootstrap capacitor connection (100–470 nF) enabling high-side gate drive; must be placed adjacent to SW and VCC pins. |
| 4 | VCC | Bias supply output (4.1 V); bypassed with 2.2-µF/16-V capacitor to AGND - no external loading permitted. |
| 5 | FB | Feedback input referenced to 1-V internal reference; sets output voltage via resistor divider (e.g., RFBB = 10 kΩ, RFBT = 40.2 kΩ for 5 V). |
| 6 | PGOOD | Open-drain power-good flag; requires 10–100-kΩ pullup to ≤12 V logic rail for system reset or enable coordination. |
| 7 | EN/SYNC | Multi-function pin: logic-high (>1.55 V) enables regulator; AC-coupled external clock (200–2200 kHz) synchronizes switching frequency. |
| 8, 9 | AGND | Analog ground reference for feedback, reference, and control circuitry; must connect to low-noise system ground plane. |
| 10 | VIN | Main input supply (4–36 V); requires local 10-µF ceramic input capacitor placed near VIN and PGND pins. |
| 11, 12 | PGND | Power ground return for low-side FET and input/output capacitors; must tie directly to thermal pad and AGND at single point. |
| Thermal Pad | Exposed PAD | Low-impedance thermal and electrical connection to PGND; mandatory for thermal performance and EMI reduction - must be fully soldered. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PGOOD | Enables deterministic power sequencing and fault reporting in multi-rail systems without external supervisors. |
| Forced-PWM Only Operation | Guarantees constant 2.1-MHz switching across full load range, simplifying EMI filter design and improving transient response predictability. |
| Wettable Flanks WSON | Supports automated AOI of solder joints, increasing manufacturing yield and field reliability in industrial-grade assemblies. |
| Internal Compensation | Eliminates need for external Type-II/III compensation network, reducing BOM count and layout sensitivity to output capacitor ESR. |
| Prebias Soft Start | Allows safe startup into powered-down downstream circuits (e.g., hot-pluggable modules) without output voltage overshoot or reverse current. |
Applications
| PLC CPU Power Supply | GSM Module Power |
|---|---|
Use Scenario: Providing stable 3.3-V or 5-V rail to ARM Cortex-M7-based PLC CPU under fluctuating 24-V factory bus voltage with EMI constraints. IC Role / Device Role / Timing Role: Primary buck regulator delivering 2.5-A continuous current with PGOOD signaling CPU readiness and hiccup-mode protection during motor surge events. Use Value: 2.1-MHz FPWM operation minimizes conducted EMI in dense control cabinets; 4-V min input ensures operation during brownouts. | Use Scenario: Powering LTE/GSM communication modules in fleet tracking units operating from vehicle battery (9–16 V) with sleep-mode current budget <100 µA. IC Role / Device Role / Timing Role: System power manager supplying 3.3-V logic rail with ultra-low 75-µA quiescent current and 2-µA shutdown current. Use Value: Enables >5-year battery life in GPS-enabled asset trackers; PGOOD confirms clean power before modem initialization. |
| Industrial Sensor Hub | HVAC Controller Power |
Use Scenario: Generating isolated 5-V and 3.3-V rails for analog front-end, ADC, and wireless SoC in distributed environmental sensor nodes. IC Role / Device Role / Timing Role: Single-chip DC-DC solution replacing discrete buck + LDO, integrating feedback, soft-start, and protection in one WSON package. Use Value: Compact 3.0 mm × 3.0 mm footprint saves PCB area; wettable flanks ensure solder joint integrity in temperature-cycled installations. | Use Scenario: Regulating 24-V HVAC control panel supply to 5-V MCU and 12-V actuator drivers in building management systems. IC Role / Device Role / Timing Role: Main 2.5-A buck converter with precision enable for staged power-up of display, fan controller, and communication interfaces. Use Value: 1.55-V enable threshold and 0.4-V hysteresis allow clean sequencing; thermal shutdown prevents failure during summer peak loads. |
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 | 8-pin HSOIC package; supports PFM/FPWM mode selection; no PGOOD pin; RθJA = 42.0°C/W. | Lacks PGOOD flag and wettable flanks; better suited for cost-sensitive, non-AOI production with less stringent thermal requirements. | Select when PGOOD is unnecessary and board space allows larger HSOIC; verify EN/SYNC configuration matches FPWM-only requirement. |
| LMZM33603 | Complete 3-A module with integrated inductor; 3.8-mm × 3.0-mm × 1.6-mm footprint; 4–36-V input; fixed 5-V or adjustable 1–7-V output. | Higher integration reduces design time but increases height and cost; no FPWM mode - operates in auto-mode (PFM/PWM hybrid). | Choose for fastest time-to-market where board height permits and 3-A capability is needed; not drop-in compatible due to different pinout and regulation scheme. |
Compared with LMR23625CFPDRRT, the LMR23625CFDDA offers lower assembly cost but sacrifices PGOOD and thermal performance, while the LMZM33603 trades design flexibility for rapid prototyping - neither matches the LMR23625CFPDRRT's combination of FPWM determinism, PGOOD, and compact wettable-flank WSON.
Availability
LMR23625CFPDRRT is available at Aetrix Electronics and suitable for factory automation PLC CPU power supplies, GSM module power systems, and HVAC controller power regulation requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.
Supply support for LMR23625CFPDRRT 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 decades of expertise in high-reliability industrial power conversion.
The LMR23625CFPDRRT belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC-DC regulators, designed specifically for wide-input-voltage industrial applications where robustness, minimal external components, and fast time-to-market are critical.
FAQ
What is the switching frequency configuration of the LMR23625CFPDRRT?
The LMR23625CFPDRRT operates exclusively in forced-PWM (FPWM) mode at a fixed 2.1-MHz switching frequency. Unlike HSOIC variants, it does not support PFM mode - this ensures constant frequency, low output ripple, and predictable EMI behavior across all load conditions, making it ideal for noise-sensitive industrial environments.
Does the LMR23625CFPDRRT support external clock synchronization?
Yes, the LMR23625CFPDRRT supports frequency synchronization via its EN/SYNC pin. An AC-coupled external clock signal (200 kHz to 2.2 MHz, 2.8–5.5 V amplitude) can be injected to align switching edges with system clocks or other converters, reducing beat frequencies and easing EMI compliance testing in multi-rail systems.
What is the purpose of the PGOOD pin on the LMR23625CFPDRRT?
PGOOD on the LMR23625CFPDRRT is an open-drain power-good flag that asserts high when the output voltage is within ±6% of target (92–110% of 1-V reference). It enables precise power sequencing in multi-rail systems - for example, releasing a processor reset only after the LMR23625CFPDRRT output stabilizes - and supports fault detection during short-circuit events.
Can the LMR23625CFPDRRT start up into a prebiased output?
Yes, the LMR23625CFPDRRT supports soft start into a prebiased load. Its internal soft-start circuit ramps the reference voltage linearly over 6 ms (WSON-specific), preventing output voltage overshoot and reverse current flow when powering downstream circuits already holding residual charge - essential for hot-swap and modular system designs.
What thermal management practices are required for the LMR23625CFPDRRT?
The LMR23625CFPDRRT requires full soldering of its exposed thermal pad to a dedicated PGND copper pour with multiple thermal vias (≥6× 0.3-mm diameter) to an internal ground plane. This achieves the specified RθJA = 41.5°C/W and enables 2.5-A continuous operation at +85°C ambient. Leaving the pad unsoldered or using insufficient vias risks thermal shutdown under sustained load.
LMR23625CFPDRRT 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):
- 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, Wettable Flank
- Supplier Device Package:
- 12-SON (3x3)
LMR23625CFPDRRT FAQ
1.How can I place an order for LMR23625CFPDRRT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR23625CFPDRRT 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 LMR23625CFPDRRT reliable?
The price and inventory of LMR23625CFPDRRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR23625CFPDRRT is usually 5 days.
3.What payment methods are accepted for LMR23625CFPDRRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR23625CFPDRRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR23625CFPDRRT?
LMR23625CFPDRRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR23625CFPDRRT 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 LMR23625CFPDRRT?
For technical support, including LMR23625CFPDRRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR23625CFPDRRT requirements.
6.How does Aetrix verify that LMR23625CFPDRRT is sourced from the original manufacturer or authorized distributors?
All LMR23625CFPDRRT 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 LMR23625CFPDRRT meets industry standards.
7.What is the process for return or replacement of LMR23625CFPDRRT?
All LMR23625CFPDRRT units undergo pre-shipment inspection (PSI). If there is an issue with LMR23625CFPDRRT, 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 LMR23625CFPDRRT part is unused and in its original packaging.
Return procedure for LMR23625CFPDRRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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