2.75-V to 6-V, 4-A step-down module with adjustable-frequency & tracking in 3 x 4-mm SIP package 14-uSiP -40 to 125
Texas Instruments
Texas Instruments - XPSM82810SILT
$3.33
Texas Instruments - TPSM82810SSILR
$3.43 - $4.23