Texas Instruments LM2588S-3.3/NOPB

Overview

LM2588S-3.3/NOPB from Texas Instruments is a monolithic 5-A flyback/boost regulator IC with fixed 3.3-V output, integrated 65-V NPN switch, 4–40-V input range, current-mode control, and external shutdown capability-designed for isolated or non-isolated DC-DC conversion in industrial power supplies and embedded systems.

For engineers reviewing the LM2588S-3.3/NOPB datasheet, LM2588S-3.3/NOPB pinout, LM2588S-3.3/NOPB application, or LM2588S-3.3/NOPB equivalent, key selection considerations include its ±4% system output tolerance over line/load, 100–200-kHz adjustable switching frequency, thermal/UVLO/current-limit protection, soft-start function, and compatibility with standard flyback transformers and inductors.

Technical Context

The LM2588S-3.3/NOPB implements current-mode control with an internal error amplifier (transconductance: 1.193 mmho typ), 1.23-V reference (used internally to set 3.3-V output via fixed resistor divider), and oscillator synchronized via pin 6. Its NPN switch delivers up to 5 A with 65-V standoff and 0.7-V saturation voltage at 5 A.

Operation includes undervoltage lockout (3.3 V threshold), thermal shutdown, cycle-by-cycle current limiting, and soft-start via internal 11-μA current source charging the compensation capacitor. Shutdown draws ≤60 μA total (16 μA from VIN, 40 μA from ON/OFF pin).

Key Specifications

Pinout & Package

LM2588S-3.3/NOPB is supplied in the KTW (DDPAK/TO-263-7) package: 14.986 mm × 10.16 mm body, surface-mount, thermally enhanced with exposed die pad. Pin numbering follows TI's standard 7-pin TO-263 layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2587S-3.3/NOPB, the LM2588S-3.3/NOPB delivers 67% more switch current and adds sync capability-critical for noise-sensitive multi-rail systems. Versus UCC28C43D, it trades design flexibility for integration, reducing component count and layout complexity in mid-power industrial supplies.

Availability

LM2588S-3.3/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, and telecom line cards requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for LM2588S-3.3/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 series was designed specifically for cost-effective, low-component-count flyback, forward, and boost converter implementations in industrial, automotive, and telecom infrastructure-emphasizing ruggedness, integrated protection, and ease of use.

FAQ

What is the maximum input voltage rating for the LM2588S-3.3/NOPB?

The LM2588S-3.3/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operation from 4 V to 40 V. Exceeding 40 V may trigger undervoltage lockout recovery instability or reduce long-term reliability-TI specifies 40 V as the upper limit for guaranteed performance across temperature and load conditions. The LM2588S-3.3/NOPB must not be operated continuously above 40 V in production designs.

Does the LM2588S-3.3/NOPB require external feedback resistors to set the 3.3-V output?

No, the LM2588S-3.3/NOPB integrates the feedback resistor divider internally to produce a fixed 3.3-V output-pin 3 (Feedback) connects directly to the internal 1.23-V reference node. External resistors are unnecessary and would disrupt regulation. This distinguishes the LM2588S-3.3/NOPB from the adjustable LM2588 version, which requires external R1/R2 to set V_OUT.

Can the LM2588S-3.3/NOPB be used in a non-isolated boost configuration?

Yes, the LM2588S-3.3/NOPB supports non-isolated boost topologies per TI's Figure 17 reference design. It regulates 3.3 V from inputs as low as 4 V using an inductor, diode, and output capacitor. However, output current is limited by external components-not internally-so designers must ensure the inductor saturation current and diode PIV ratings exceed peak switch current (5 A) and 65-V standoff.

What thermal management is required for the LM2588S-3.3/NOPB in continuous 3-A operation?

At 3-A output in a KTW package with 1 oz. copper area (0.4896 in²), the LM2588S-3.3/NOPB exhibits θ_JA = 35°C/W. With 12-V input and 3.3-V/3-A output (efficiency ≈75%), power dissipation is ~11.5 W, yielding ~400°C rise-exceeding 150°C max junction. A minimum 4-in² copper pour or external heatsink is mandatory. TI recommends θ_JA ≤ 26°C/W (7.4× package area) for full-load operation without forced air.

Is the LM2588S-3.3/NOPB pin-compatible with other LM2588 variants like the 5-V or adjustable versions?

Yes, all LM2588 variants-including LM2588S-3.3/NOPB, LM2588S-5.0/NOPB, LM2588S-12/NOPB, and LM2588SX-ADJ/NOPB-share identical KTW (TO-263-7) pinout, package dimensions, and electrical interface. Only the internal feedback divider differs; compensation, shutdown, sync, and switching functions remain functionally identical across the family.