The "DC=E2H" marking is a manufacturer-specific code. Depending on the brand, it identifies the following parts: RT9193-18GB (often used in crypto mining hardware repair). XC6219B182MR Micro Commercial Components (MCC) MCL9193K518 Availability
Noise Bypass Pin. Connecting a 10nF capacitor reduces overall output noise. VOUT Regulated Fixed 1.8V Output Pin. 2. Key Specifications & Electrical Characteristics dc e2h datasheet
Designed for noise-sensitive applications like cellular phones and wireless LANs. The "DC=E2H" marking is a manufacturer-specific code