16-SOIC dual-rail LCD bias generator
The MAX722CSE-T is a dual-output linear regulator from Analog Devices, packaged in a standard 16-SOIC narrow body (3.90 mm width). It generates one low-voltage rail (0 V to 3.3 V) for logic or controller supply and a second programmable high-voltage rail (5 V to 100 V) for LCD bias or display backplane drive. Input voltage spans 7 V to 20 V, accepting unregulated wall adapters, battery packs, or a regulated intermediate bus. The commercial temperature range (0°C to 70°C) limits deployment to indoor, temperature-controlled equipment — palmtop computers, instrumentation panels, and converter modules where the ambient stays within office or lab conditions.
Dual output rails: logic bias and LCD high voltage
Output 1 provides a regulated 0 V to 3.3 V range — this rail powers the microcontroller core, memory, or interface logic in a portable LCD terminal. Output 2 delivers 5 V to 100 V, adjustable via external resistors, to bias the LCD glass. The two outputs share a common input but regulate independently, so the LCD bias does not couple noise into the logic rail. The 7 V minimum input headroom means a 5 V logic rail cannot directly feed the regulator — a 9 V battery or 12 V bus is the practical supply. The 20 V maximum input covers most single-cell Li-ion (4.2 V) boosted to 12 V or a 2-cell stack (7.4-8.4 V) without exceeding the abs-max. Packaged in Bulk rather than tape-and-reel — the MOQ is typically a tube or tray quantity, not a full reel. For a surplus-lot buyer, this means the date-code spread may be tighter than a reel pull, but the handling cost per unit is higher if re-reeling is needed for pick-and-place.
RoHS status and compliance boundary
The MAX722CSE-T is marked RoHS non-compliant. The lead-bearing solder finish on the leads means this part cannot ship into EU RoHS-restricted markets without an exemption claim. It remains suitable for legacy designs, military/aerospace contracts with leaded solder exemption, or repair stock where the original BOM specified tin-lead finish. Lifecycle status is Active — Analog Devices continues to manufacture this part with no published end-of-life notice.