Texas Instruments LM2825N-5.0

Overview

LM2825N-5.0 from Texas Instruments is a fixed-output 5.0 V, 1 A DC-DC buck converter in a 24-pin PDIP package, featuring ±4% output voltage tolerance, 80% typical efficiency at 12 V_IN/0.5 A, and wide 7–40 V input range. It integrates all active and passive components for high-efficiency step-down regulation and is used in on-card switching regulators and distributed power systems.

For engineers reviewing the LM2825N-5.0 datasheet, LM2825N-5.0 pinout, LM2825N-5.0 application, or LM2825N-5.0 equivalent, key selection considerations include its fixed 5.0 V output, 1 A guaranteed load current, 65 μA standby quiescent current, thermal shutdown protection, and compatibility with standard through-hole PCB layouts for industrial embedded power rails.

Technical Context

The LM2825N-5.0 implements a self-contained synchronous buck topology with internal MOSFETs, oscillator, error amplifier, and current-limit protection. Its 150 kHz fixed-frequency PWM control ensures stable regulation across 7–40 V input while maintaining ≤8 mV load regulation and ≤2.7 mV line regulation under specified conditions.

It features TTL-compatible shutdown/soft-start control (1.3 V threshold), integrated thermal shutdown, and current limiting (1.2 A min, 2.4 A max). The device operates from −40°C to +85°C ambient and delivers up to 1 A output with no external components required beyond input/output capacitors.

Key Specifications

Pinout & Package

LM2825N-5.0 is housed in a 24-pin plastic dual-in-line package (PDIP), package drawing NFL, with 1.25 × 0.54 × 0.26 inch profile. Pins are arranged in two parallel rows; "NC" pins are electrically isolated but connected to copper pads for thermal management only.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2576-5.0, LM2825N-5.0 provides superior integration in PDIP form with no external power devices, while TPS54202DRT delivers higher efficiency and flexibility at the cost of increased design complexity and SMT-only assembly.

Availability

LM2825N-5.0 is available at Aetrix Electronics and suitable for industrial power rails, embedded control systems, distributed power architectures, and pre-regulation stages requiring stable component supply and long-term manufacturability.

Supply support for LM2825N-5.0 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 was designed for cost-sensitive, space-constrained industrial and embedded applications requiring fully integrated, through-hole DC-DC buck converters with minimal external components and robust fault protection.

FAQ

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

The LM2825N-5.0 supports an input voltage range of 7 V to 40 V DC. This range is specifically validated for the 5.0 V fixed-output version and ensures stable operation across common industrial bus voltages including 12 V and 24 V systems. Operation below 7 V may result in dropout or regulation loss, and exceeding 40 V risks absolute maximum rating violation. The LM2825N-5.0 datasheet specifies these limits in the Operating Ratings table.

Does the LM2825N-5.0 require external components to function?

No, the LM2825N-5.0 operates as a complete DC-DC buck converter with no external power components required. Only input and output capacitors are needed for stability and ripple suppression. Unlike adjustable versions, the LM2825N-5.0 integrates the feedback network internally, eliminating external resistors. The LM2825N-5.0 datasheet confirms this in the "No External Components Required" highlight and Figure 17 test circuit.

How does the shutdown feature work on the LM2825N-5.0?

The LM2825N-5.0 uses a single SD/SS pin for both shutdown and soft-start control. Driving this pin below 0.6 V places the device in low-quiescent-current shutdown (65 μA typical). Applying a 2–3 V ramp initiates soft-start, gradually increasing output voltage to avoid inrush current. The LM2825N-5.0 shutdown threshold is TTL-compatible and requires no external pull-up or level-shifting circuitry per the Electrical Characteristics table.

What is the thermal performance of the LM2825N-5.0 in its PDIP package?

The LM2825N-5.0 has a junction-to-ambient thermal resistance (θ_JA) of 30 °C/W when soldered to a PCB with ~2 in² of 1 oz. copper. This value assumes no external heatsink and defines the temperature rise above ambient at full 1 A load. Derating curves in the LM2825N-5.0 datasheet show usable output current drops above 70°C ambient due to thermal limiting, confirming the need for adequate copper area in thermally demanding applications.

Is the LM2825N-5.0 RoHS compliant and what is its packaging status?

Yes, the LM2825N-5.0/NOPB variant is RoHS-compliant and green (Pb-free, no Sb/Br), with CU SN lead finish and JEDEC Level-1 moisture sensitivity. Per TI's Packaging Addendum, LM2825N-5.0/NOPB is ACTIVE with 12-unit reel packaging, while the non-NOPB LM2825N-5.0 is marked LIFEBUY. Both share identical electrical and thermal specifications; the NOPB version is recommended for new designs requiring environmental compliance.