iFi hip dac 3 is a fantastic little portable DAC/amp with a Burr-Brown chipset, a built-in 2,200 mAh battery, and both 3.5 mm (S-Balanced) and 4.4 mm balanced outputs. In my testing it had tons of usable power for IEMs and full-size headphones, plus genuinely useful features like PowerMatch, IEMatch, and XBass.
Pros
+Musical and warm tuning with a solid black background
+Plenty of power for many full-size headphones and basically any IEM
+3.5 mm S-Balanced and 4.4 mm balanced outputs
+PowerMatch gain switch, IEMatch for sensitive IEMs, and XBass analog bass shelf
+Built-in battery and separate USB-C charging port for charging while listening
+USB-C input and strong accessory bundle (USB-C, USB-A, Lightning cables)