The TPSM86837 and TPSM86838 are compact synchronous step-down power modules designed for 12V, 19V and 24V power buses. Each device integrates the power MOSFETs, shielded inductor and essential passive components into a 5.0mm × 5.5mm package.

Both modules provide up to 8A continuous output current and support output voltages from 0.6V to 5.5V. D-CAP3 control enables fast transient response without external loop compensation.

The 28V specification is the maximum operating input voltage. Designers using a 24V rail must ensure that input transients remain within the device limits.

TPSM86837 vs TPSM86838 Specifications

Main Difference: Eco-Mode vs FCCM

Choose TPSM86837 for Light-Load Efficiency

TPSM86837 enters Eco-mode when the output load decreases. This reduces switching losses and improves efficiency during standby or variable-load operation.

It is suitable for applications where:

The load frequently enters idle or standby mode

Light-load efficiency is important

Lower system power consumption has priority

Some variation in switching frequency at light load is acceptable

Typical applications include industrial computers, communications equipment and systems with variable processor or FPGA loads.

Choose TPSM86838 for Lower Ripple

TPSM86838 operates in forced continuous conduction mode, or FCCM. It maintains continuous switching at light load, providing more predictable switching behavior and generally lower output ripple.

It is the better option where:

Low output ripple is important

A more consistent switching frequency is required

The load powers noise-sensitive digital, analog or RF circuitry

EMI filtering needs predictable switching behavior

FCCM can consume more power than Eco-mode under light-load conditions, so the choice involves a trade-off between standby efficiency and ripple performance.

FAQ

What is the main difference between TPSM86837 and TPSM86838?

TPSM86837 uses Eco-mode to improve light-load efficiency. TPSM86838 uses FCCM to provide lower ripple and more consistent switching behavior.

Can these modules operate from a 24V input?

Yes. Both support inputs from 4.5V to 28V and are suitable for regulated 24V buses. Input transients must remain within the device ratings.

What output voltage can they provide?

Both devices support adjustable outputs from 0.6V to 5.5V.

Do TPSM86837 and TPSM86838 require an external inductor?

No. The shielded power inductor is integrated into the module.

Are TPSM86837 and TPSM86838 pin-compatible?

They use the same 19-pin, 5.0mm × 5.5mm B3QFN package and share the same core electrical specifications. However, switching-mode behavior, thermal conditions and ripple requirements should be reviewed before substitution.

Can the modules always deliver 8A?

The rated maximum output is 8A, but actual continuous-current capability depends on operating conditions and PCB thermal design. Consult the TI datasheet derating curves before finalizing the design.