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Texas Instruments LM2825N-12/NOPB
- Part No.:
- LM2825N-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.600", 15.24mm)
- Datasheet:
-
LM2825N-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 1A 24PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
LM2825N-12/NOPB from Texas Instruments is a fixed-output 12V, 1A synchronous buck DC-DC converter in a 24-pin PDIP package, featuring ±4% output voltage tolerance, 87% typical efficiency at 24VIN/0.5A, and integrated thermal shutdown with current limiting. It operates across −40°C to +85°C ambient and supports TTL-compatible shutdown control for power sequencing in industrial power supplies.
For engineers reviewing the LM2825N-12/NOPB datasheet, LM2825N-12/NOPB pinout, LM2825N-12/NOPB application, or LM2825N-12/NOPB equivalent, key selection considerations include input voltage range (15–40V), output current derating above 70°C, soft-start programmability, radiated EMI compliance to CISPR 22 Class B, and absence of external components required for basic operation.
Technical Context
The LM2825N-12/NOPB integrates a PWM controller, power MOSFETs, bootstrap diode, oscillator, error amplifier, and protection circuitry into a single 24-pin PDIP package. Its fixed 12V output is internally trimmed, eliminating external feedback resistors, and it uses internal current-mode control with 150 kHz switching frequency and second-stage current limit reduction under overload.
Thermal management relies on PCB copper area as heatsink (θJA = 30°C/W), while shutdown/soft-start functionality is implemented via a dedicated SD/SS pin with 1.3V threshold and 65 μA standby quiescent current. Radiated emissions are measured per CISPR 22 at 10 m, meeting Class B limits up to 1 GHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.0 V ±4% - ensures stable rail for 12V logic, sensors, or intermediate bus without external resistor network. |
| Max Input Voltage | 40 V - supports wide industrial input ranges including 24V nominal systems with transients. |
| Output Current | Up to 0.75 A at full spec (derated above 0°C) - sufficient for point-of-load conversion in distributed power architectures. |
| Efficiency | 87% typical at 24VIN, 0.5A load - reduces thermal load and improves system-level power density (35 W/in³). |
| Quiescent Current | 65 μA in shutdown - enables low-power retention modes in battery-backed or always-on systems. |
| Switching Frequency | 150 kHz - balances EMI performance and inductor size; reduced under current-limit conditions for fault handling. |
| Operating Temp | −40°C to +85°C ambient - qualified for industrial and automotive under-hood environments. |
Pinout & Package
LM2825N-12/NOPB uses a 24-pin plastic dual-in-line (PDIP) package (Package Drawing NFL), measuring 1.25 × 0.54 × 0.26 inches, with through-hole mounting and copper lead frame for thermal conduction to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 15–40V DC; requires local bypass capacitor if >6″ from bulk filter. |
| GND | Power ground | Common return for input, output, and control circuits; critical for noise immunity and thermal path. |
| VOUT | Regulated output | Delivers fixed 12V at up to 0.75A; ripple ≤100 mVp-p at 24VIN/1A. |
| SD/SS | Shutdown/Soft-start control | TTL-compatible input: <0.6V = shutdown (65 μA IQ), >2.0V = soft-start enabled (ramped output rise). |
| NC | No connect | Pins 1, 2, 3, 4, 5, 6, 7, 18, 19, 20, 21, 22, 23, 24 - electrically isolated but may be used for thermal pad attachment. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables rapid design-in for 12V point-of-load regulation without feedback resistors, compensation networks, or external MOSFETs. |
| TTL shutdown with soft-start | Allows precise power sequencing and inrush current limiting via single SD/SS pin-no external timing capacitors needed unless extended ramp required. |
| Radiated EMI compliant | Meets CISPR 22 Class B limits (≤37 dBμV/m at 230–1000 MHz) at 10 m distance-reduces need for external filtering in EMC-sensitive applications. |
| Integrated protection | Includes thermal shutdown, cycle-by-cycle current limiting, and short-circuit foldback-eliminates need for external fault-handling circuitry. |
| High reliability | MTBF >20 million hours - validated for long-life industrial and embedded systems requiring minimal field failure rates. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24V vehicle battery or industrial 24V rail to regulated 12V for microcontrollers, CAN transceivers, and analog sensors. IC Role / Device Role / Timing Role: Primary step-down regulator providing clean, protected 12V rail with thermal and overcurrent resilience. Use Value: Eliminates need for discrete buck controller + MOSFET + gate driver, reducing BOM count and layout complexity while meeting CISPR 22 Class B emissions. | Use Scenario: Powering interior lighting drivers, door lock actuators, and HVAC control logic in harsh temperature environments. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter delivering robust 12V supply with −40°C to +85°C operation and 65 μA shutdown current. Use Value: Enables low-power sleep mode retention and withstands automotive load dump transients up to 40V without external clamping. |
| Distributed Power System | Programmable Logic Controller (PLC) |
Use Scenario: Local regulation on I/O modules where centralized 24V backplane feeds multiple 12V sub-systems. IC Role / Device Role / Timing Role: Self-contained buck converter with no external passives-ideal for space-constrained module designs. Use Value: Achieves 35 W/in³ power density and simplifies thermal design via PCB copper heatsinking, avoiding discrete heat sinks. | Use Scenario: Providing isolated 12V auxiliary power for FPGA configuration, real-time clock, and communication interfaces in industrial controllers. IC Role / Device Role / Timing Role: Pre-regulator feeding linear regulators or LDOs to achieve ultra-low-noise rails. Use Value: High efficiency (87%) minimizes heat generation in sealed enclosures, while ±4% output tolerance ensures reliable downstream IC operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVS-12 | 5-pin TO-220 package; 3A output; 52 kHz switching; requires external diode and inductor. | Higher current capability but larger footprint and more external components; less integrated than LM2825N-12/NOPB. | Select when >1A load or higher thermal margin is required; avoid if board space or component count is constrained. |
| TPS54202DDCR | 6-pin SOT-23 package; 2A output; 500 kHz switching; requires external inductor and feedback resistors. | Smaller footprint and higher frequency, but lacks integrated EMI filtering and fixed-output simplicity. | Select for compact, high-frequency designs where external passives are acceptable; not drop-in due to different pinout and control scheme. |
Compared with LM2825N-12/NOPB, LM2576HVS-12 offers higher current but demands more board area and external components, while TPS54202DDCR provides miniaturization at the cost of integration and EMI performance-LM2825N-12/NOPB remains optimal for rapid, low-component-count 12V/0.75A conversion with certified emissions compliance.
Availability
LM2825N-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, distributed power systems, and programmable logic controllers requiring stable component supply and long-term manufacturability.
Supply support for LM2825N-12/NOPB 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 experience in high-reliability power conversion ICs.
The LM2825 product line was designed for simplified, high-density DC-DC conversion in industrial and automotive applications where integration, EMI compliance, and thermal resilience are critical-delivering complete buck solutions in a single PDIP package.
FAQ
What is the maximum input voltage rating for LM2825N-12/NOPB?
The absolute maximum input voltage for LM2825N-12/NOPB is +45V, but the recommended operating range is 15V to 40V DC. Exceeding 40V risks violating the specified electrical characteristics and may trigger internal protection circuits. The device is commonly used with 24V industrial or automotive inputs, where transient spikes up to 40V are tolerated without external clamping.
Does LM2825N-12/NOPB require external components to operate?
No-LM2825N-12/NOPB is a fully integrated buck converter requiring no external feedback resistors, compensation network, or power MOSFETs. Only input and output capacitors are needed for stable operation; a soft-start capacitor is optional. This eliminates typical design iterations associated with loop compensation and component selection, accelerating time-to-market for 12V point-of-load applications.
What is the output current capability of LM2825N-12/NOPB across temperature?
LM2825N-12/NOPB delivers up to 0.75A continuously at full specification within its operating ambient range of −40°C to +85°C. Output current is thermally derated above 0°C, dropping to ~0.5A at +70°C and further at +85°C. Derating curves in the datasheet (Figure 23) define exact limits based on input/output voltage combinations and PCB copper area.
How does the shutdown and soft-start function work on LM2825N-12/NOPB?
LM2825N-12/NOPB uses a single SD/SS pin: applying <0.6V places the device in shutdown mode (IQ = 65 μA), while >2.0V initiates soft-start, ramping VOUT gradually via internal current source. No external capacitor is required for basic soft-start, though adding one (0.1–1 μF) extends ramp time for sensitive loads. This dual-function pin simplifies power sequencing in multi-rail systems.
Is LM2825N-12/NOPB RoHS compliant and lead-free?
Yes-LM2825N-12/NOPB carries the "/NOPB" suffix indicating Green (RoHS & no Sb/Br) compliance per TI's packaging standards. It features CU SN lead finish, is exempt from MSL restrictions (Level-1-NA-UNLIM), and meets JEDEC moisture sensitivity requirements. The "NOPB" designation confirms it contains no lead, bromine, or antimony-based flame retardants.
LM2825N-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 15V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
LM2825N-12/NOPB FAQ
1.How can I place an order for LM2825N-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2825N-12/NOPB 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 LM2825N-12/NOPB reliable?
The price and inventory of LM2825N-12/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2825N-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2825N-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2825N-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2825N-12/NOPB?
LM2825N-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2825N-12/NOPB 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 LM2825N-12/NOPB?
For technical support, including LM2825N-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2825N-12/NOPB requirements.
6.How does Aetrix verify that LM2825N-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2825N-12/NOPB 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 LM2825N-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2825N-12/NOPB?
All LM2825N-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2825N-12/NOPB, 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 LM2825N-12/NOPB part is unused and in its original packaging.
Return procedure for LM2825N-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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