Typical industrial and automotive applications require multiple high current, low voltage power supplies to drive everything from disk drives to microprocessors. The LT®3507 triple step-down converter fi ts easily into these applications. It is simple and compact compared to multi-chip solutions. The LT3507 is a single IC current mode triple step- down regulator with internal power switches and a low dropout linear regulator driver. The switching convert- ers are capable of generating one 2.4A output and two 1.5A outputs. All three converters are synchronized to a single oscillator, with the 2.4A output running antiphase to the other two converters, thereby reducing input ripple current. Each converter has independent shutdown and soft-start circuits and generates a power good signal when its output is in regulation, simplifying both supply sequencing and the interface with microcontrollers and DSPs. Separate input pins for each regulator offer ad- ditional fl exibility; regulators can be cascaded to reduce circuit size, or each regulator can draw power from a different input source. The switching frequency is set with a single resistor between 250kHz to 2.5MHz. High switching frequency allows the use of small inductors and capacitors result- ing in a very compact triple output supply. The constant switching frequency, combined with low impedance ceramic capacitors, results in low output ripple. With its wide input voltage range of 4V to 36V, the LT3507 regulates a broad array of power sources including 5V logic rails, unregulated wall transformers, lead acid bat- teries and distributed power supplies.