LM2596S-ADJ/NOPB vs LM2596S-ADJ-EV Component Comparison

Quick verdict

For standard 3A buck regulator applications with a straightforward BOM and well-documented TI support, the LM2596S-ADJ/NOPB is the better choice due to its established datasheet and clear packaging details. The LM2596S-ADJ-EV, seemingly an evaluation or alternate source version with minimal spec differences, is appropriate mainly for quick prototyping or when availability or cost from EVVO is preferable, but it lacks detailed documentation and qualification info.

Spec comparison table

SpecLM2596S-ADJ/NOPBLM2596S-ADJ-EVNotes
FunctionStep-Down BuckStep-Down BuckIdentical functionality, no difference.
Input Voltage Max (V)40 V40 VIdentical max input voltage; no advantage.
Input Voltage Min (V)4.5 VNot specifiedKnown 4.5V min on NOPB is safer for low-voltage designs; EV version unspecified, a risk.
Mounting TypeSurface MountSurface MountIdentical; no difference.
Number of Outputs11Identical.
Operating Temperature (TJ)-40°C to 125°C-40°C to 125°CIdentical industrial temperature range.
Output ConfigurationPositivePositiveIdentical.
Output Current Max (A)3 A3 AIdentical max output current.
Output TypeAdjustableAdjustableIdentical.
Output Voltage Max (V)37 V37 VIdentical max output voltage.
Output Voltage Min (V)1.2 V1.2 VIdentical min output voltage.
Package CaseTO-263-6, D2PAK (5 Leads + Tab)TO-263-6, D2PAK (5 Leads + Tab)Both TO-263 packages, but supplier package names differ slightly (TO-263 (DDPAK-5) vs TO-263-5L).
Supplier Device PackageTO-263 (DDPAK-5)TO-263-5LMinor naming difference; verify pinout for compatibility (see section on drop-in compatibility).
Switching Frequency Typ. (kHz)150 kHz150 kHzIdentical switching frequency.
Synchronous RectifierNoNoBoth use diode rectification; no difference.
TopologyBuckBuckIdentical.
GradeNot specifiedNot specifiedNo data on grade or qualification for either; unknown quality or reliability differences.
QualificationNot specifiedNot specifiedNo qualification info to distinguish.

Design trade-offs

From the raw specs, both devices are functionally equivalent step-down regulators with a 3A output current limit, adjustable output voltage from 1.2V to 37V, and a 150kHz switching frequency. The switching frequency is fixed, which simplifies filter design but limits options for EMI optimization or size reduction via higher frequency inductors.

The main practical difference lies in the packaging and sourcing. The LM2596S-ADJ/NOPB is a Texas Instruments branded part with a clear, well-documented datasheet specifying a TO-263-6 (DDPAK-5) package with 5 leads plus a tab. This package is common, with well-known thermal characteristics and footprint references. The LM2596S-ADJ-EV, supplied by EVVO, uses a TO-263-5L package designation, which may indicate subtle mechanical differences or pin configuration changes. This could affect PCB footprint compatibility, thermal pad design, and soldering profiles.

Thermal considerations are critical at 3A output currents. Both parts dissipate significant power depending on input-output voltage differential and efficiency. The TO-263 package (D2PAK) provides a tab for heat sinking, but the exact tab size and thermal resistance could vary slightly between suppliers. Without explicit thermal resistance data, design margins should be conservative, especially for the EVVO part, where qualification and thermal specs are not detailed.

Efficiency curves are not provided for either, but given identical switching frequency, topology, and output current ratings, efficiency differences will mostly depend on process variations and discrete component selection (inductor, diode). Both parts lack synchronous rectification, which means diode conduction losses dominate at higher currents; expect roughly 75–85% efficiency depending on load and input voltage.

Gate drive requirements and layout sensitivity will be similar, as both are monolithic regulators using the same fundamental topology. The 150kHz switch frequency is low enough to reduce layout-induced ringing and EMI compared to higher-frequency regulators but still requires careful input/output decoupling and short high-current loop paths.

Cost at volume will depend on supplier agreements and sourcing. The TI part may command a premium for brand, documentation, and supply chain reliability. The EVVO version might be more cost-effective for low-volume or prototyping, but the lack of detailed datasheet and qualification data introduces risk for production designs.

Use-case fit

Choose LM2596S-ADJ/NOPB when…

Choose LM2596S-ADJ-EV when…

Drop-in compatibility

Based on the source data, both parts use a TO-263 package with 5 leads plus tab, but the supplier device package is listed as TO-263 (DDPAK-5) for the TI part and TO-263-5L for the EVVO part. This suggests a high likelihood of pin and footprint compatibility, but the slight difference in package naming means the mechanical dimensions and pin spacing should be confirmed before substitution.

Pinouts are not explicitly detailed here, so an engineer must cross-reference datasheets or request mechanical drawings to confirm exact compatibility. Without this, assuming drop-in substitution is risky, especially for production hardware. Electrical characteristics are the same, so if the package and footprint match, the substitution should be straightforward.

Alternatives to consider