LTC3547B Series

Dual Monolithic 300mA Synchronous Step-Down Regulator

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

Dual Monolithic 300mA Synchronous Step-Down Regulator

Part	Package / Case	Voltage - Output (Max) [Max]	Voltage - Output (Min/Fixed)	Voltage - Input (Min) [Min]	Voltage - Input (Max) [Max]	Frequency - Switching	Output Configuration	Output Type	Topology	Mounting Type	Current - Output	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package	Function	Number of Outputs
Analog Devices Inc./Maxim Integrated LTC3547BIDDB#TRPBF	8-WFDFN Exposed Pad	5.5 V	0.6 V	2.5 V	6.5 V	2.25 MHz	Positive	Adjustable	Buck	Surface Mount	300 mA	125 °C	-40 °C	8-DFN (3x2)	Step-Down	2
Analog Devices Inc./Maxim Integrated LTC3547BIDDB#TRMPBF	8-WFDFN Exposed Pad	5.5 V	0.6 V	2.5 V	6.5 V	2.25 MHz	Positive	Adjustable	Buck	Surface Mount	300 mA	125 °C	-40 °C	8-DFN (3x2)	Step-Down	2
Analog Devices Inc./Maxim Integrated LTC3547BEDDB#TRPBF	8-WFDFN Exposed Pad	5.5 V	0.6 V	2.5 V	5.5 V	2.25 MHz	Positive	Adjustable	Buck	Surface Mount	300 mA	85 C	-40 ¯C	8-DFN (3x2)	Step-Down	2

Catalog

Dual Monolithic 300mA Synchronous Step-Down Regulator

Description

The LTC3547B 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 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. 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.ApplicationsCellular TelephonesDigital Still CamerasWireless and DSL ModemsPortable Media PlayersPDAs/Palmtop PCs