AS1321_1 AMSCO [austriamicrosystems AG], AS1321_1 Datasheet

AS1321_1

Manufacturer Part Number

AS1321_1

Description

130mA Step-Up DC-DC Converter

Manufacturer

AMSCO [austriamicrosystems AG]

Datasheet

1.AS1321_1.pdf (13 pages)

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Da t a s h eet

A S 1 3 2 1

1 3 0 m A St e p - U p D C - D C C o n v e r t e r

1 General Description

The AS1321 is a high-efficiency step-up DC-DC con-

verter designed to generate a fixed output voltage of

+5.0V.

The AS1321 achieves an efficiency of up to 96%. The

minimum input voltage is +1.5V, the output voltage is

fixed at +5.0V, and output current is up to 130mA

(@ 2V V

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-time-clocks.

The AS1321 provides a power-on reset output that goes

high-impedance when the output reaches 90% of its reg-

ulation 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 1. AS1321 - Typical Application Diagram

www.austriamicrosystems.com

+1.5V to +5.0V

BATT

Battery

22µF

Off

10µH

SHDNN

BATT

Revision 1.02

AS1321

2 Key Features

3 Applications

The AS1321 is ideal for low-power applications where

ultra-small size is critical as in medical diagnostic equip-

ment, 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.

Fixed Output Voltage: +5.0V

Output Current: Up to 130mA (@ 2V V

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

6-pin SOT23 Package

Mode for Backup Power

RESETN

GND

OUT

22µF

OUT

100kΩ

Output

+5.0V

RESETN

Output

BATT

)

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Related parts for AS1321_1

AS1321_1 Summary of contents

Page 2

AS1321 Datasheet - Pinout Pin Assignments Figure 2. Pin Assignments (Top View) Pin Descriptions Table 1. Pin Descriptions Name Pin Number SHDNN 1 BATT 2 GND OUT 5 RESETN 6 ...

Page 3

AS1321 Datasheet - Absolute Maximum Ratings Stresses beyond those listed in Table 2 and functional operation of ...

Page 4

AS1321 Datasheet - Electrical Characteristics T = -40 to +85º +2V, V ...

Page 5

AS1321 Datasheet - Typical Operating Characteristics V = 2.0V, ...

Page 6

AS1321 Datasheet - Figure 9. Maximum Output Current vs. V ...

Page 7

AS1321 Datasheet - Figure 15 Off Response; R ...

Page 8

AS1321 Datasheet - Detailed Description The AS1321 is a high-efficiency, compact step-up converter with 35µA quiescent supply current which ensures ...

Page 9

AS1321 Datasheet - Low-Battery Cutoff The AS1321 SHDNN trip threshold (1.228V) can be used as an input voltage detector that disables ...

Page 10

AS1321 Datasheet - Application Information Inductor Selection The control circuitry of the AS1321 permits a wide range ...

Page 11

AS1321 Datasheet - Package Drawings and Markings The AS1321 is available in a ...

Page 12

AS1321 Datasheet - Ordering Information The AS1321 is available as the standard products shown in Table 4. Ordering Information Ordering ...

AS1321 Datasheet Copyrights Copyright © 1997-2009, 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 ...

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