AS1321-T

AS1321-T Datasheet

AS1321

Part	Datasheet
AS1321-T	AS1321-T (pdf)

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Datasheet AS1321 130mA Step-Up DC-DC Converter 1 General Description The AS1321 is a high-efficiency step-up DC-DC converter designed to generate a fixed output voltage of +5.0V. The AS1321 achieves an efficiency of up to The minimum input voltage is +1.5V, the output voltage is fixed at +5.0V, and output current is up to 130mA 2V VBATT. In order to save power the AS1321 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-timeclocks. The AS1321 provides a power-on reset output that goes highimpedance when the output reaches 90% of its regulation point. The SHDNN trip threshold of the AS1321 can be used as an input voltage detector that disables the device when the battery voltage falls to a predetermined level. An internal synchronous rectifier is included, which is parallel with the external Schottky diode. The AS1321 is available in a 6-pin SOT23 package. Figure AS1321 - Typical Application Diagram 2 Key Features ! Fixed Output Voltage +5.0V ! Output Current Up to 130mA 2V VBATT ! Internal Synchronous Rectifier ! Shutdown Mode Supply Current Less Than 1µA ! Efficiency Up to 96% ! Minimum Input Voltage +1.5V ! Accurate Shutdown Low-Battery Cutoff Threshold ! Battery Input Connected to Pin OUT in Shutdown Mode for Backup Power ! 6-pin SOT23 Package 3 Applications The AS1321 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 +5.0V supply or as a battery backup. 2 BATT +1.5V to +5.0V Battery CIN 22µF 10µH SHDNN AS1321 5 OUT COUT 22µF 6 RESETN +5.0V Output R1 100kΩ RESETN Output 3 GND 1 - 13 AS1321 Datasheet - Pin Assignments 4 Pin Assignments Figure Pin Assignments Top View SHDNN 1 6 RESETN BATT 2 AS1321 5 OUT GND 3 Pin Descriptions Table Pin Descriptions Pin Number Pin Name SHDNN BATT RESETN Description Active-Low Logic Shutdown Input 0 = The AS1321 is off and the current into BATT is 1µA typ . 1 = The AS1321 is on. Battery Voltage Input Ground External Inductor Connection Output Voltage Active-Low reset output Datasheet - Ordering Information 11 Ordering Information The AS1321 is available as the standard products shown in Table Table Ordering Information Ordering Code AS1321-T Marking ASKX Description 130mA Step-Up DC-DC Converter Delivery Form Tape and Reel Package 6-pin SOT23 Note All products are RoHS compliant. Buy our products or get free samples online at ICdirect: Technical Support is found at For further information and requests, please contact us or find your local distributor at Design the AS1321 online at analogbench is a powerful design and simulation support tool that operates in on-line and off-line mode to evaluate performance and generate application-specific bill-of-materials for austriamicrosystems' power management devices. 12 - 13 AS1321 Datasheet Copyrights Copyright 1997-2010, austriamicrosystems AG, Tobelbaderstrasse 30, 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 life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. 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 Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: 13 - 13

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Datasheet

AS1321
130mA Step-Up DC-DC Converter
1 General Description

The AS1321 is a high-efficiency step-up DC-DC converter designed to generate a fixed output voltage of +5.0V. The AS1321 achieves an efficiency of up to The minimum input voltage is +1.5V, the output voltage is fixed at +5.0V, and output current is up to 130mA 2V VBATT. In order to save power the AS1321 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-timeclocks. The AS1321 provides a power-on reset output that goes highimpedance when the output reaches 90% of its regulation point. The SHDNN trip threshold of the AS1321 can be used as an input voltage detector that disables the device when the battery voltage falls to a predetermined level. An internal synchronous rectifier is included, which is parallel with the external Schottky diode. The AS1321 is available in a 6-pin SOT23 package.

Figure AS1321 - Typical Application Diagram
2 Key Features
! Fixed Output Voltage +5.0V ! Output Current Up to 130mA 2V VBATT ! Internal Synchronous Rectifier ! Shutdown Mode Supply Current Less Than 1µA ! Efficiency Up to 96% ! Minimum Input Voltage +1.5V ! Accurate Shutdown Low-Battery Cutoff Threshold ! Battery Input Connected to Pin OUT in Shutdown Mode for

Backup Power ! 6-pin SOT23 Package
3 Applications

The AS1321 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 +5.0V supply or as a battery backup.
2 BATT
+1.5V to +5.0V Battery

CIN 22µF
10µH

SHDNN

AS1321
5 OUT

COUT 22µF
6 RESETN
+5.0V Output

R1 100kΩ

RESETN Output
3 GND
1 - 13

AS1321

Datasheet - Pin Assignments
4 Pin Assignments

Figure Pin Assignments Top View

SHDNN 1
6 RESETN

BATT 2 AS1321 5 OUT

GND 3

Pin Descriptions

Table Pin Descriptions

Pin Number

Pin Name

SHDNN

BATT

RESETN

Description Active-Low Logic Shutdown Input 0 = The AS1321 is off and the current into BATT is 1µA typ . 1 = The AS1321 is on. Battery Voltage Input Ground External Inductor Connection Output Voltage Active-Low reset output
Datasheet - Ordering Information
11 Ordering Information

The AS1321 is available as the standard products shown in Table
Table Ordering Information
Ordering Code AS1321-T

Marking ASKX

Description 130mA Step-Up DC-DC Converter

Delivery Form Tape and Reel

Package 6-pin SOT23

Note All products are RoHS compliant. Buy our products or get free samples online at ICdirect:

Technical Support is found at

For further information and requests, please contact us or find your local distributor at

Design the AS1321 online at analogbench is a powerful design and simulation support tool that operates in on-line and off-line mode to evaluate performance and generate application-specific bill-of-materials for austriamicrosystems' power management devices.
12 - 13

AS1321

Datasheet

Copyrights

Copyright 1997-2010, austriamicrosystems AG, Tobelbaderstrasse 30, 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 life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. 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 Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01

For Sales Offices, Distributors and Representatives, please visit:
13 - 13

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Datasheet ID: AS1321-T 519586