Dual-output power supply for portable and industrial gear
The Texas Instruments TPS61103PWG4 is a dual-output power management IC that packs a synchronous step-up (boost) converter and a linear LDO regulator into a single 20-TSSOP package. The boost channel delivers a regulated 3.3 V at up to 1.8 A, while the LDO provides an adjustable output from 0.9 V to 3.6 V at 500 mA — enough to power a mixed-voltage system from a single low-voltage battery or 3.3 V rail.
The 500 kHz switching frequency is a middle ground — fast enough to keep inductor size small, slow enough to avoid tight layout constraints on a 2-layer board.
Housed in a 20-TSSOP with 0.65 mm pitch and a 4.40 mm body width, the part reflows on a standard lead-free profile. The moisture sensitivity level is not stated in this listing, so a bake before reflow is prudent if the tube seal has been compromised — a precaution that avoids the popcorning that can lift the thin TSSOP leads.