LTC3563 - 500mA, Synchronous Step-Down DC/DC Converter with Selectable Output Voltage

LTC3563 - 500mA, Synchronous Step-Down DC/DC Converter with Selectable Output Voltage - Linear Technology（凌力尔特）

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.

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

Cellular Telephones

Wireless and DSL Modems

Digital Cameras

MP3 Players

PDAs and Other Handheld Devices

器件型号	封装	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量)
LTC3563EDC	2x2 DFN-6	E	$2.29
LTC3563EDC#PBF	2x2 DFN-6	E	$2.29
LTC3563EDC#TRMPBF	2x2 DFN-6	E	$2.29	$1.65
LTC3563EDC#TRPBF	2x2 DFN-6	E	$2.29	$1.60

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