Voltage Monolithic Switcher


Posted on Aug 28, 2012

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. The threshold for bridged mode operation is about 8V, so the converter will operate primarily in buck mode except during a cold crank condition. During buck operation, this converter can provide load currents up to 350mA with input voltages up to 60V. Operating with a nominal 13.8V input, this LT3433 converter accommodates loads of 400mA and produces efficiencies up to 82%.



The LT3433 uses a 200kHz constant frequency, current mode architecture and operates with input voltages from 4V to 60V. An internal 1% accurate voltage reference allows programming of precision output voltages up to 20V using an external resistor divi




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