Texas Instruments LM2592HVSX-3.3

Overview

LM2592HVSX-3.3 from Texas Instruments is a monolithic 150 kHz step-down (buck) switching regulator IC delivering a fixed 3.3 V output at up to 2 A load current, with ±4% output voltage tolerance over line and load, input voltage range up to 60 V, and integrated thermal shutdown and current limiting. It serves as a primary DC/DC power conversion stage in industrial power supplies and automotive subsystems.

For engineers reviewing the LM2592HVSX-3.3 datasheet, LM2592HVSX-3.3 pinout, LM2592HVSX-3.3 application, or LM2592HVSX-3.3 equivalent, key selection considerations include its 60 V max input rating, 2 A guaranteed output capability, 150 kHz fixed-frequency operation enabling compact filter design, ON/OFF control interface, and 90 μA standby quiescent current for low-power modes.

Technical Context

The LM2592HVSX-3.3 integrates a PWM controller, power switch, internal frequency compensation, and feedback comparator in a single IC. Its 150 kHz oscillator enables use of smaller inductors and capacitors than lower-frequency buck regulators, while the two-stage current limit and thermal shutdown provide fault protection without external circuitry.

It operates in continuous conduction mode across its full 4.5–60 V input range and supports output regulation down to 3.3 V with no external resistive divider-feedback is internally connected to the output pin. The ON/OFF pin provides logic-level shutdown with 1.3 V threshold and <200 μA max standby current draw.

Key Specifications

Pinout & Package

LM2592HVSX-3.3 is housed in a 5-pin DDPAK (TO-263) surface-mount package with exposed thermal pad for enhanced heat dissipation. The package features a 2°C/W junction-to-case thermal resistance and supports PCB copper area optimization for thermal management.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck regulator applications.

Compared with LM2592HVSX-3.3, LM2596SX-3.3 offers higher current headroom but demands more PCB area and thermal management, while TPS54202DRCT delivers superior light-load efficiency and integration at the cost of increased design complexity and narrower input range.

Availability

LM2592HVSX-3.3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controller (PLC) I/O modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LM2592HVSX-3.3 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 solutions.

The LM2592HV series was designed specifically for rugged, wide-input-voltage DC/DC conversion in industrial and transportation systems where simplicity, thermal resilience, and input transient tolerance are critical.

FAQ

What is the maximum input voltage rating for LM2592HVSX-3.3?

The LM2592HVSX-3.3 has an absolute maximum input voltage rating of 63 V, with guaranteed operation across 4.5 V to 60 V. This makes it suitable for 24 V and 48 V industrial systems, as well as automotive applications subject to load-dump transients. Operation above 60 V risks permanent damage, and the device includes internal protection to prevent latch-up within its specified operating range.

Does LM2592HVSX-3.3 require external feedback resistors?

No, LM2592HVSX-3.3 does not require external feedback resistors. As a fixed-output variant, its Feedback (Pin 4) is internally connected to the Output (Pin 2), establishing a precise 3.3 V regulation point without external components. This simplifies layout, improves production consistency, and eliminates resistor tolerance errors that affect adjustable versions.

How does the ON/OFF pin function on LM2592HVSX-3.3?

The ON/OFF pin (Pin 5) of LM2592HVSX-3.3 enables logic-level shutdown: pulling it to ≤0.6 V enables regulation, while driving it to ≥2.0 V places the device in low-power standby mode drawing only ~90 μA. The pin tolerates up to +25 V and draws <5 μA in either state, supporting direct interfacing with microcontrollers or discrete logic without level-shifting.

What thermal performance can be expected from LM2592HVSX-3.3 in a standard PCB layout?

In a standard 4-layer PCB with 2.5 in² of 1 oz. copper connected to the DDPAK thermal pad, LM2592HVSX-3.3 achieves a junction-to-ambient thermal resistance (θJA) of ~30°C/W. At 2 A load and 12 V input, typical power dissipation is ~1.8 W, resulting in ~54°C junction rise above ambient - well within the +125°C max operating temperature when ambient stays below +71°C.

Is LM2592HVSX-3.3 RoHS compliant and lead-free?

Yes, LM2592HVSX-3.3 is RoHS compliant and manufactured with lead-free terminations per TI's standard packaging specifications. The DDPAK (TO-263) package uses matte tin plating and conforms to JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3), requiring bake conditioning if exposed to ambient for >168 hours before reflow.