LTC3569 Datasheet | Linear Technology

Triple Buck Regulator with 1.2A and Two 600m A Outputs and Individual Programmable References Features n Three Independent Current Mode Buck DC/DC Regulators (1.2A and 2 × 600m A) n Single Pin Programmable VFB Servo Voltages from 800m V Down to 425m V (in 25m V Steps) n Pull VFB High to Make Each 600m A Buck a Slave for Higher Current Operation n Pulse-Skipping or Burst Mode® Operation n Programmable Switching Frequency (1MHz to 3MHz) or Fixed 2.25MHz n Synchronizable (1.2MHz to 3MHz) n VIN Range 2.5V to 5.5V n All Regulators Internally pensated n PGOOD Output Flag n Quiescent Current <100µA (All Regulators in Burst Mode Operation) n Zero Shutdown Current n Overtemperature and Short-Circuit Protection n Tiny 3mm × 3mm, 3mm × 4mm 20-Lead QFN and Thermally Enhanced TSSOP FE-16 Packages Applications n Portable Applications with Multiple Supply Rails n General Purpose Step-Down DC/DC n Dynamic Voltage Scaling Applications Description The LTC®3569 contains three monolithic, synchronous step-down DC/DC converters. Intended for medium power applications, it operates over a 2.5V to 5.5V input voltage range. The operating frequency is adjustable from 1MHz to 3MHz, allowing the use of tiny, low cost capacitors and inductors. The three output voltages are independently programmable by toggling the EN pins up to 15 times, lowering the 800m V FB references by 25m V per cycle. The first buck regulator sources load currents up to 1200m A. The other two buck regulators each provide 600m A. The two 600m A buck regulators can also be configured to operate as slave power stages, running in parallel with another internal buck regulator to supply higher load currents. When operating as parallel, slave output stages, discrete external ponents are shared and available output currents sum together. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Thin SOT is a trademark of Linear Technology Corporation. All other trademarks are the property of...