austriamicrosystems AS1320 Product Brief 2 0 0 m A St e p - U p D C - D C C o n v e r t e r 1 General Description 2 Key Features The AS1320 is a high-efficiency step-up DC-DC converter designed to generate a fixed voltage of +3.3V. The AS1320 achieves an efficiency of up to 90%. The minimum input voltage is 1.5V, the output voltage is fixed at 3.3V, and output current is up to 200mA (@ 2V). In order to save power the AS1320 features a shutdown mode, where it draws less than 1µA. In shutdown mode the battery is connected directly to the output enabling the supply of real-time-clocks. ! Fixed Output Voltage: 3.3V ! Output Current: Up to 200mA (@ 2V) ! Internal Synchronous Rectifier ! Requires No External Schottky Diode or FETs ! Shutdown Mode Supply Current: Less Than 1µA ! Efficiency: Up to 90% The AS1320 provides a power-on reset output that goes high-impedance when the output reaches 90% of its regulation point. ! Minimum Input Voltage: +1.5V ! The SHDNN trip threshold of the AS1320 can be used as an input voltage detector that disables the device when the battery voltage falls to a predetermined level. Accurate Shutdown Low-Battery Cutoff Threshold ! Battery Input Connected to Pin OUT in Shutdown Mode for Backup Power An internal synchronous rectifier is included, thus an external transistor or Schottky diode is not required. ! 6-pin SOT23 Package The AS1320 is available in a 6-pin SOT23 package. 3 Applications The AS1320 is ideal for low-power applications where ultra-small size is critical as in medical diagnostic equipment, hand-held instruments, pagers, digital cameras, remote wireless transmitters, cordless phones, and PC cards. The device is also perfect as a local 3.3V supply or as a battery backup. Figure 1. Application Diagram 2 4 +1.5 to +3.5V Battery L1 10µH CIN 22µF On Off www.austriamicrosystems.com LX +3.3V Output 5 BATT OUT AS1320 1 6 RESETN 3 SHDNN GND Revision 1.0 COUT 22µF R1 100kΩ RESETN Output austriam i c r o systems AS132 0 Product Brief Copyrights Copyright © 1997-2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG A-8141 Schloss Premstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 e-mail: [email protected] For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com austriamicrosystems – www.austriamicrosystems.com Revision 1.0 a leap ahead