Dual-rail automotive PMIC in a 14-pin HTSSOP
The Texas Instruments TPS65321AQPWPRQ1 combines a step-down buck converter rated for 3.2A output with a 280mA LDO in a single 14-HTSSOP package. The buck output is adjustable from 1.1V to 20V; the LDO covers 1.1V to 5.5V. Input supply range spans 3V to 36V, covering nominal 12V and 24V automotive buses with headroom for load-dump transients.
The buck converter delivers up to 3.2A. The LDO provides 280mA. The integrated supervisor monitors the output rails and asserts a reset on undervoltage — one less external voltage monitor on the BOM. No sequencer means the buck and LDO power up simultaneously; if sequenced rails are required, an external sequencer or a PMIC with that feature is needed.