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4V-60V (Cold Crank) Input to 5V Output DC/DC Automotive Converter 5V Backup Supply from Supercap Runs Down to VIN = 2V with 250mA Load Automotive 5V Regulator with Cold Crank Capability Buck-Boost Converter In SuperCap Backup Power Supply Energy Harvesting Converter Operates from a Variety of Weak Sources Industrial 12V 1MHz Regulator with Custom Input Undervoltage Lockout Thresholds Single Supercapacitor Charger from 1.8V to 5.5V Input to 5V Output (1000mA Max Input Current) Solar Powered Converter Extends Battery Life in Low Power 3V Primary Battery Applications Solar Powered Converter with MPPC Charges Storage Capacitor Stacked Supercapacitor Charger from 1.8V to 5.5V Input to 5V Output (1000mA Max Input Current) Supercap Powered Backup Supply USB, FireWire, Automotive and Unregulated Wall Adapter to Regulated 5V
Ultrawide input voltage requirements are a common design problem for DC/DC converter applications, but when that range includes voltages both above and below the output voltage, the converter must perform both step-up and step-down functions. The LT3433 is a high voltage monolithic DC/DC converter that incorporates two switch elements, allowing for a unique topology that accommodates both step-up and step-down conversion using a single inductor. A 4V-60V to 5V DC/DC converter is shown in Figure 2. This converter is well suited for 12V automotive battery applications, maintaining output voltage regulation with battery line voltages from 4V cold crank through 60V load dump.