Texas Instruments LM2825N-5.0/NOPB

Overview

LM2825N-5.0/NOPB from Texas Instruments is a self-contained 1A fixed-output DC-DC buck converter in a 24-pin PDIP package, delivering regulated 5.0V ±4% output across 7V–40V input, with 80% typical efficiency at 12V_IN/0.5A, 65 μA standby current, and integrated thermal/current protection for industrial power rails.

For engineers reviewing the LM2825N-5.0/NOPB datasheet, LM2825N-5.0/NOPB pinout, LM2825N-5.0/NOPB application, or LM2825N-5.0/NOPB equivalent, key selection criteria include input voltage range compatibility (7–40V), no-external-component operation, TTL shutdown capability, radiated EMI compliance to CISPR 22 Class B, and thermal derating behavior above 70°C ambient.

Technical Context

The LM2825N-5.0/NOPB integrates a PWM controller, power MOSFET switch, diode, inductor, and feedback network into a single 24-pin PDIP package. Its fixed 5.0V output eliminates external resistor dividers, and its 150 kHz oscillator enables predictable EMI filtering while supporting up to 1A continuous load under specified thermal conditions.

Operation includes programmable soft-start via external capacitor on Pin 23, TTL-compatible shutdown control on Pin 22 (1.3V threshold), and internal current limiting (1.2A min) with thermal shutdown. Line regulation is 2.7 mV over 7–40V input, and load regulation is 8 mV from 0.1A to 1A at 12V_IN.

Key Specifications

Pinout & Package

LM2825N-5.0/NOPB uses a 24-pin plastic dual-in-line package (PDIP), package drawing NFL, dimensions 1.25 × 0.54 × 0.26 inches (31.8 × 13.7 × 6.6 mm), with copper lead frame for thermal conduction to PCB copper planes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output buck converter applications.

Compared with LM2575HVS-5.0, LM2825N-5.0/NOPB offers superior EMI performance (CISPR 22 Class B verified) and lower active quiescent current, while TPS54202DDCR provides higher current and frequency flexibility at the cost of design complexity and input voltage limitation.

Availability

LM2825N-5.0/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, embedded controller pre-regulators, on-card distributed power, and legacy DC/DC module replacements requiring stable component supply, long-lifecycle assurance, and RoHS-compliant through-hole assembly.

Supply support for LM2825N-5.0/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 ICs, with decades of expertise in high-reliability power conversion solutions.

The LM2825 product line delivers fully integrated, application-ready DC-DC buck converters targeting cost-sensitive, space-constrained industrial and instrumentation systems requiring minimal design effort and guaranteed electrical performance.

FAQ

What input voltage range is supported by the LM2825N-5.0/NOPB?

The LM2825N-5.0/NOPB supports an input voltage range of 7V to 40V, with minimum input requirements of 7V for proper regulation of its fixed 5.0V output. Operation below 7V may result in dropout or unregulated output. Absolute maximum input is +45V, beyond which permanent damage may occur.

Does the LM2825N-5.0/NOPB require external components to function?

No - the LM2825N-5.0/NOPB is a complete, self-contained 5.0V buck converter requiring no external resistors, capacitors, or compensation networks for basic operation. Only optional components - such as an input bypass capacitor (if >6″ from source) or soft-start capacitor on Pin 23 - are needed for enhanced reliability or sequencing.

How does the shutdown and soft-start functionality work on the LM2825N-5.0/NOPB?

The LM2825N-5.0/NOPB uses Pin 22 (SD/SS) for combined shutdown and soft-start control: applying <0.6V places the device in shutdown (65 μA I_Q), while applying >2.0V initiates soft-start. A 0.1–1 μF capacitor on this pin controls ramp rate, reducing inrush current and enabling controlled power-up in current-limited systems.

What is the thermal performance and derating behavior of the LM2825N-5.0/NOPB?

The LM2825N-5.0/NOPB has a junction-to-ambient thermal resistance (θ_JA) of 30°C/W in standard PDIP mounting. Full 1A output is ensured from −40°C to 70°C ambient; above 70°C, output current must be derated per Figure 23, dropping to ~0.75A at 85°C ambient with typical PCB copper area.

Is the LM2825N-5.0/NOPB compliant with electromagnetic interference standards?

Yes - the LM2825N-5.0/NOPB meets CISPR 22 Class B radiated emission limits at 10m distance (30–1000 MHz), as verified in the official datasheet. This compliance is achieved with standard PCB layout practices and no additional shielding, making it suitable for industrial and commercial equipment without added EMI mitigation cost.