LTC3547BEDDB#TRMPBF

LTC3547B is a dual, constant-frequency, synchronous step-down DC/DC converter. 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 300mA 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 compensated to work with ceramic capacitors. It is used in application such as cellular telephones, digital still cameras, wireless and DSL modems, portable media players, PDAs/palmtop PCs etc.

• High efficiency (upto 96%) dual step-down outputs
• Low dropout operation is 100% duty cycle
• No schottky diodes required, internally compensated 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, supply current is 450μA typical at (VFB1 = VFB2 = 0.95 × VFBREG)
• Ultralow shutdown current is 1μA max at (RUN1 = RUN2 = 0V, VIN = 5.5V)
• Operating temperature is -40°C to 85°C
• Package style is 8-lead plastic DFN

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party