This 12V to 4.2V DCDC Buck Converter Module provides a fixed 4.2V output from an input range of 8V to 36V and can supply up to 3A. Designed for reliable voltage regulation in compact form, it is suitable for applications that require a precise 4.2V supply derived from a higher voltage source such as automotive, industrial, or batterypowered systems. Key benefits Fixed 4.2V output from a broad input range (8V to 36V): delivers a stable, precise voltage suitable for Liion cell circuits and other loads that require 4.2V regulation. Up to 3A continuous current: supports moderate power loads without the need for a linear regulator that would waste heat. Wide input compatibility: usable with vehicle power, DC power adapters, or other highervoltage sources, enabling flexible integration. Compact module design: compact form factor facilitates easy mounting on PCBs or within small enclosures, enabling clean, spacesaving installations. Simple, dependable operation: a dedicated buck conversion solution that reduces heat and improves efficiency compared with linear regulation when dropping from higher input voltages. Key specifications and attributes Functionality: fixed output buck converter module with 4.2V output. Input compatibility: operates from 8V to 36V input. Output capability: fixed 4.2V output. Maximum load current: up to 3A. Size and form factor: described as a module suitable for compact applications; exact dimensions are not specified. Material: not specified in the available listing; construction is a standard electronic module with conventional PCB components. Performance notes: designed to provide a stable 4.2V supply under the stated input and current limits. Applications and use cases Liion battery charging circuits: provide a stable 4.2V reference for charging singlecell Liion batteries from a higher voltage source such as a 12V automotive system or other 8–36V supplies. 4.2V load supply from highervoltage sources: power small electronics that require a precise 4.2V source sourced from automotive, industrial, or bench power supplies. Prototyping and educational projects: use as a compact, fixedoutput regulator to study buck conversion behavior and to build test benches that require a consistent 4.2V reference. Notes The module is configured for a fixed 4.2V output; it is intended for applications needing a precise 4.2V supply from an 8–36V input. No adjustable output is indicated in the product description. Exact physical dimensions and enclosure materials are not specified in the provided specifications. This description reflects the product's brand intent, specifications, model characteristics, and features as listed: a 12V to 4.2V DCDC Buck Converter Module with 8V–36V input range, 4.2V fixed output, and 3A maximum output current, presented in a concise, customerfriendly format for easy assessment and integration.