LTC3547 Datasheet | Linear Technology

Features High Efficiency Dual Step-Down Outputs: Up to 96% - 300m A Output Current per Channel at V = 3V IN - Automatic Low Ripple Burst Mode Operation (20m VP-P) - Only 40µA Quiescent Current During Operation (Both Channels) - 2.25MHz Constant-Frequency Operation .. - 2.5V to 5.5V Input Voltage Range - Low Dropout Operation: 100% Duty Cycle - Internally pensated for All Ceramic Capacitors - Independent Internal Soft-Start for Each Channel - 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 - LTC3547 Dual Monolithic 300m A Synchronous Step-Down Regulator DESCRIPTIO The LTC®3547 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 and USB powered applications. Supply current during operation is only 40µA and drops to < 1µA in shutdown. Automatic Burst Mode® operation increases efficiency at light loads, further extending battery life. An internally set 2.25MHz switching frequency allows the use of tiny surface mount inductors and capacitors. Internal soft-start reduces inrush current during startup. All outputs are internally pensated to work with ceramic capacitors. The LTC3547 is available in a low profile (0.75mm) 3mm × 2mm DFN package. The LTC3547 is also available in a fixed output voltage configuration, eliminating the need for the external feedback networks (see Table 2). , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation....