Texas Instruments LM2593HVT-3.3/NOPB

Overview

LM2593HVT-3.3/NOPB from Texas Instruments is a monolithic 150-kHz non-synchronous step-down DC-DC converter delivering up to 2 A at fixed 3.3 V output, with input voltage support up to 60 V, ±4% output voltage tolerance over line/load/temperature, and integrated shutdown/soft-start and out-of-regulation error flag. It serves as a high-efficiency buck regulator in industrial power supplies and automotive subsystems.

For engineers reviewing the LM2593HVT-3.3/NOPB datasheet, LM2593HVT-3.3/NOPB pinout, LM2593HVT-3.3/NOPB application, or LM2593HVT-3.3/NOPB equivalent, key selection criteria include its 60-V max input rating, 2-A guaranteed load capability, TO-263-7 thermal performance (R_θJA = 30°C/W with 0.5 in² copper), 90-μA standby current, and programmable power-up delay via external capacitor on Pin 5.

Technical Context

The LM2593HVT-3.3/NOPB implements a fixed-frequency (150 kHz) current-mode PWM control architecture with internal frequency compensation and a single N-channel DMOS power switch. Its feedback loop compares the regulated 3.3-V output directly to an internal 1.23-V reference via fixed resistor divider, eliminating external sensing components.

Functional modes include active regulation (SD/SS ≥ 2 V), shutdown (SD/SS ≤ 0.6 V, I_Q ≈ 90 μA), and soft-start (capacitor on SD/SS pin ramps duty cycle from 0% to 100%). The error flag (Pin 3) asserts low ≤1 V when output drops below 95% of nominal, with programmable delay set by capacitor on Pin 5 charged by 3-μA current source.

Key Specifications

Pinout & Package

LM2593HVT-3.3/NOPB is housed in a 7-pin TO-263 (KTW) thermally enhanced surface-mount package with exposed thermal pad. Package dimensions are 10.10 mm × 8.89 mm, and the tab must be soldered to PCB copper for thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with LM2593HV-3.3/NOPB, the TO-220 variant trades thermal performance for mechanical flexibility; compared with LM2678-3.3/NOPB, LM2593HVT-3.3/NOPB provides integrated fault signaling at the cost of lower peak efficiency and current rating-making it optimal for cost-sensitive, space-constrained designs requiring autonomous power monitoring.

Availability

LM2593HVT-3.3/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, telecom remote radio units, and medical portable diagnostic devices requiring stable component supply and long-term manufacturability.

Supply support for LM2593HVT-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 company headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and personal electronics markets.

The LM2593HV series belongs to TI's SIMPLE SWITCHER® power converter product line, engineered for ease of use in mid-power DC-DC applications where minimal external components, wide input range, and integrated protection are essential.

FAQ

What is the maximum input voltage rating for LM2593HVT-3.3/NOPB?

The LM2593HVT-3.3/NOPB has an absolute maximum input voltage rating of 63 V, with recommended operation up to 60 V. This enables direct use with 24-V and 48-V industrial buses and withstands automotive load-dump transients. Exceeding 60 V risks violating recommended operating conditions and may reduce reliability, even if within absolute maximum limits.

Does LM2593HVT-3.3/NOPB require external feedback resistors?

No, LM2593HVT-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, the 3.3-V reference is internally trimmed and connected directly to the feedback pin (Pin 6), eliminating resistor tolerance errors and layout sensitivity. This simplifies design and improves output accuracy to ±4% across temperature and load.

How does the error flag (Pin 3) operate on LM2593HVT-3.3/NOPB?

The error flag on LM2593HVT-3.3/NOPB is an open-collector output that pulls low (≤1 V) when the regulated output falls below 95% of 3.3 V (i.e., <3.135 V). It sinks up to 3 mA and requires an external pull-up resistor (e.g., 4.7 kΩ to VOUT). A capacitor on Pin 5 introduces programmable delay before the flag asserts high after power-up, enabling controlled sequencing.

What thermal performance can be expected from LM2593HVT-3.3/NOPB in a typical PCB layout?

In a standard layout with the TO-263-7 thermal pad soldered to 0.5 in² of 1-oz copper, LM2593HVT-3.3/NOPB achieves R_θJA = 30°C/W. At 2 A load and 12 V_IN, power dissipation is ~1.8 W, resulting in ~54°C junction rise above ambient-well within the 125°C max operating temperature. Larger copper areas further reduce thermal resistance.

Can LM2593HVT-3.3/NOPB be used in shutdown mode with ultra-low power consumption?

Yes, LM2593HVT-3.3/NOPB draws only 90 μA typical quiescent current in shutdown mode (SD/SS ≤ 0.6 V), making it suitable for battery-powered applications requiring extended standby. This current remains stable across input voltages up to 60 V and temperatures from –40°C to +125°C, ensuring predictable low-power behavior in harsh environments.