Texas Instruments LM2588T-ADJ/NOPB

Overview

LM2588T-ADJ/NOPB from Texas Instruments is a monolithic 5-A flyback/boost/forward switching regulator IC with adjustable output voltage, NPN internal switch rated for 65 V standoff and 5 A peak current, 100–200 kHz programmable switching frequency, and external shutdown control. It targets isolated DC-DC power conversion in industrial power supplies and telecom line cards requiring ±4% system output tolerance over line and load.

For engineers reviewing the LM2588T-ADJ/NOPB datasheet, LM2588T-ADJ/NOPB pinout, LM2588T-ADJ/NOPB application, or LM2588T-ADJ/NOPB equivalent, key selection criteria include its 4–40 V input range, 1.23 V internal reference for output programming, current-mode control architecture, thermal/UVLO/overcurrent protection, and TO-220-7 package thermal performance.

Technical Context

The LM2588T-ADJ/NOPB implements current-mode PWM control with an internal 1.23 V reference, error amplifier, oscillator with frequency adjustment via external resistor (pin 1), and NPN power switch. Its feedback loop uses resistive divider programming of VOUT = 1.23 × (1 + R1/R2), enabling precise regulation across wide input and load ranges.

Protection features include undervoltage lockout (3.3 V threshold), thermal shutdown (150 °C max junction), cycle-by-cycle current limiting (6.5 A typical limit), and soft-start (11 μA internal current). The device supports synchronization via pin 6 and operates in flyback, boost, or forward topologies with minimal external components.

Key Specifications

Pinout & Package

LM2588T-ADJ/NOPB is housed in a 7-pin TO-220 (NDZ) package with bent, staggered leads and exposed metal tab for thermal dissipation. The tab is electrically connected to pin 2 (Ground).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar flyback/boost regulator applications.

Compared with LM2587T-ADJ/NOPB, the LM2588T-ADJ/NOPB delivers 2× higher output current and adds synchronization capability; versus UC3845N, it reduces component count and layout complexity but trades off flexibility in switch and frequency selection.

Availability

LM2588T-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, and embedded control systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance.

Supply support for LM2588T-ADJ/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 expertise in high-reliability power conversion ICs.

The LM2588 product line was designed for cost-sensitive, medium-power isolated and non-isolated DC-DC conversion in industrial, telecom, and instrumentation applications where simplicity, robustness, and wide input range are critical.

FAQ

What is the maximum output power achievable with LM2588T-ADJ/NOPB in a flyback configuration?

The LM2588T-ADJ/NOPB supports up to approximately 60 W in well-designed flyback configurations, constrained by its 5 A peak switch current, 65 V standoff, and thermal limits. Real-world output power depends on transformer design, PCB copper area, heatsinking, and ambient temperature - with 65 °C/W θJA, sustained 5 A operation requires careful thermal management. LM2588T-ADJ/NOPB data sheet Figure 19 shows load step response up to 1.2 A at 12 V, confirming viability for multi-amp designs when properly implemented.

How do I set the output voltage for LM2588T-ADJ/NOPB?

Set the output voltage of LM2588T-ADJ/NOPB using two external resistors (R1 and R2) forming a voltage divider from VOUT to GND, with the midpoint connected to the Feedback (pin 3) input. The formula is VOUT = 1.23 × (1 + R1/R2). For example, to achieve 12 V, use R2 = 2.0 kΩ and R1 = 17.5 kΩ (1% metal film recommended). LM2588T-ADJ/NOPB's internal 1.23 V reference ensures accuracy, and R2 should be between 1 kΩ and 5 kΩ for optimal temperature stability.

Does LM2588T-ADJ/NOPB require an external NPN transistor?

No, LM2588T-ADJ/NOPB integrates a 5-A, 65-V NPN power switch - no external transistor is needed. The Switch (pin 7) connects directly to the transformer primary or boost inductor. External components include only the magnetic element, output rectifier, input/output capacitors, feedback divider, and optional frequency-setting resistor. This integration reduces BOM count and simplifies layout compared to controller-only ICs like UC3845N, making LM2588T-ADJ/NOPB a complete switching regulator solution.

Can LM2588T-ADJ/NOPB synchronize to an external clock?

Yes, LM2588T-ADJ/NOPB supports external synchronization via its Sync pin (pin 6). A negative-going pulse applied to this pin forces the internal oscillator to align its switching edge, enabling multiple LM2588T-ADJ/NOPB devices or other synchronized converters to operate at the same frequency. This eliminates beat frequencies and reduces EMI in multi-rail systems. The LM2588T-ADJ/NOPB datasheet specifies a 0.75 V threshold and 100 μA input current at the sync pin, with ~700 ns delay from sync edge to switch turn-on.

What protection features are built into LM2588T-ADJ/NOPB?

LM2588T-ADJ/NOPB includes undervoltage lockout (active below 3.3 V), thermal shutdown (at 150 °C junction temperature), cycle-by-cycle current limiting (6.5 A typical), and internal soft-start. These functions protect both the IC and external components during faults, startup, or abnormal operating conditions. The current limit and UVLO are fully internal - no external components needed. LM2588T-ADJ/NOPB also draws less than 60 μA in shutdown mode, supporting low-power system states without additional circuitry.