4.5-V to 18-V input, 3A/2A/2A output, Synchronous triple buck converter 40-VQFN -40 to 125
Texas Instruments
Texas Instruments - TPS65251-2RHAT
$2.52 - $4.58
Texas Instruments - TPS65251-2RHAR
$2.11 - $2.85
Texas Instruments - TPS65251-2 HA