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

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

产品特点 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

应用

Cellular Telephones
Wireless and DSL Modems
Digital Cameras
MP3 Players
PDAs and Other Handheld Devices

典型应用图

参数

LTC3563 订购信息和价格参考Package Variations and Pricing

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

LTC3563 数据手册及相关资料下载

数据手册(英文) : LTC3563 - 500mA, Synchronous Step-Down DC/DC Converter with Selectable Output Voltage.PDF
产品选型卡 : Energy Harvesting Portfolio.PDF
可靠性数据 : R415 Reliability Data .PDF