LTC3563 Series

500mA, Synchronous Step-Down DC/DC Converter with Selectable Output Voltage

Catalog

500mA, Synchronous Step-Down DC/DC Converter with Selectable Output Voltage

Part	Function	Voltage - Input (Min) [Min]	Supplier Device Package	Current - Output	Mounting Type	Voltage - Output (Min/Fixed)	Frequency - Switching	Voltage - Input (Max) [Max]	Package / Case	Operating Temperature [Max]	Operating Temperature [Min]	Output Type	Number of Outputs	Topology	Synchronous Rectifier	Output Configuration
Analog Devices LTC3563EDC#TRMPBF	Step-Down	2.5 V	6-DFN (2x2)	500 mA	Surface Mount	1.28 V 1.87 V	2.25 MHz	5.5 V	6-WFDFN Exposed Pad	85 °C	-40 °C	Programmable	1	Buck		Positive
Analog Devices LTC3563EDC#TRPBF	Step-Down	2.5 V	6-DFN (2x2)	500 mA	Surface Mount	1.28 V 1.87 V	2.25 MHz	5.5 V	6-WFDFN Exposed Pad	85 °C	-40 °C	Programmable	1	Buck		Positive

Catalog

500mA, Synchronous Step-Down DC/DC Converter with Selectable Output Voltage

Key Features

• High Efficiency: Up to 96%

• Pin Selectable Output Voltage: 1.28V/1.87V

• Low Ripple (<20mVP-P) Burst Mode®Operation: IQ= 26µA

• Very Low Quiescent Current: Only 26µA

• 2.5V to 5.5V Input Voltage Range

• 2.25MHz Constant Frequency Operation

• Low Dropout Operation: 100% Duty Cycle

• No Schottky Diode Required

• Internal Soft-Start Limits Inrush Current

• Shutdown Mode Draws <1µA Supply Current

• ±2% Output Voltage Accuracy

• Current Mode Operation for Excellent Line and Load Transient Response

• Overtemperature Protected

• Available in 2mm × 2mm 6-Lead DFN

Description

The LTC3563 is a high efficiency monolithic synchronous buck converter using a constant frequency, current mode architecture. A voltage select input allows the user to program the output voltage to 1.28V or 1.87V. Supply current during operation is only 26µA, dropping to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3563 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Internal power switches are optimized to provide high efficiency and eliminate the need for an external Schottky diode.The switching frequency is internally set at 2.25MHz, allowing the use of small surface mount inductors and capacitors. The LTC3563 is specifically designed to work well with ceramic output capacitors, achieving very low output voltage ripple and a small PCB footprint.The LTC3563 is configured for the power saving Burst Mode Operation.ApplicationsCellular TelephonesWireless and DSL ModemsDigital CamerasMP3 PlayersPDAs and Other Handheld Devices