Maxim > Products > Part Number Search Part Number Search Maxim Product Naming Conventions MAX1681ESA 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters MAX1681ESA+ 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters MAX1681ESA+T 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters MAX1681ESA-T 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters