ALDO2, a multi-function rad-hard linear regulator for SiPM-based HEP detectors

ALDO2 is a multi-function, adjustable, low dropout linear regulator designed in onsemi I3T80 0.35~$\mu$m HV CMOS technology for use HEP detectors that adopt silicon photomultipliers (SiPMs). The chip features four independent regulators, two voltage channels (max 3.3 V) used to filter and stabilize the power supply of front-end chips, 70 V), specifically provide bias arrays SiPMs. Each can be independently shut down protected over-current over-temperature. regulators also implement circuit monitor current SiPM arrays, allowing perform I-V curves thus fine-tune working point during detector lifetime. adopts radiation hardening techniques has been fully qualified up TID 20 Mrad, 1-MeV-equivalent neutron fluence $10^{15}$ cm$^{-2}$, with heavy ions 40 MeV cm$^2$ mg$^{-1}$ LET $10^{10}$ cm$^{-2}$ cumulative fluence. will installed CMS HL-LHC phase, Barrel Timing Detector (BTL) High Granularity Calorimeter (HGCAL).