LTC3547B Datasheet | Linear Technology

LTC3547B Dual Monolithic 300m A Synchronous Step-Down Regulator Features High Efficiency (Up to 96%) Dual Step-Down Outputs - 300m A Output Current per Channel at V = 3V IN - 2.25MHz Constant-Frequency Operation - 2.5V to 5.5V Input Voltage Range - Low Dropout Operation: 100% Duty Cycle .. - No Schottky Diodes Required - Internally pensated for All Ceramic Capacitors - Independent Internal Soft-Start for Each Channel - Available in Fixed Output Versions - Current Mode Operation for Excellent Line and Load Transient Response - 0.6V Reference Allows Low Output Voltages - Short-Circuit Protected - Ultralow Shutdown Current: I < 1μA Q - Low Profile (0.75mm) 8-Lead 3mm × 2mm DFN Package - DESCRIPTIO The LTC®3547B is a dual, 2.25MHz, constant-frequency, synchronous step-down DC/DC converter in a tiny 3mm × 2mm DFN package. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Low output voltages are supported with the 0.6V feedback reference voltage. Each regulator can supply 300m A continuous output current. The input voltage range is 2.5V to 5.5V, making it ideal for Li-Ion polymer and USB powered applications. Supply current is only 1μA in shutdown. An internally set 2.25MHz switching frequency allows the use of tiny surface mount inductors and capacitors. Internal soft-start reduces inrush current during start-up. All outputs are internally pensated to work with ceramic capacitors. The LTC3547B is available in a low profile (0.75mm) 3mm × 2mm DFN package. The LTC3547B is also available in a fixed output voltage configuration selected via internal resistor dividers (see Table 2). , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6580258, 5481178, 6304066, 6127815, 6498466, 6611131. U APPLICATIO S - - - - -...