SAN3020
APPLICATION NOTE
sa me s
SINGLE CHIP TELEPHONE POWER
EXTRACTION FOR EXTERNAL LOADS
1 Scope
This application note describes a simple add-on circuit for extracting current to supply external loads. It also
includes hardware description ,schematic and Vout/Iout curves.
2 Key Features
•
•
•
Only few additional low-cost components necessary
Can drive line currents up to ILine-5mA (=15mA for 20mA line current)
No influence in AC impedance or DC mask even when load is short circuited
Table of Contents
1 SCOPE.............................................................................................................................................................................................................1
2 KEY FEATURES ..............................................................................................................................................................................................1
3 OTHER APPLICABLE DOCUMENTS AND PAPERS ......................................................................................................................................1
4 REVISION STATUS .........................................................................................................................................................................................1
5 GENERAL DESCRIPTION...............................................................................................................................................................................1
6 HARDWARE CONFIGURATION......................................................................................................................................................................2
7 CIRCUIT DESCRIPTION..................................................................................................................................................................................2
8 CONNECTING LOADS AT VDD ........................................................................................................................................................................2
9 APPLICATION SCHEMATIC............................................................................................................................................................................3
10 LIABILITY AND COPYRIGHT STATEMENT..................................................................................................................................................4
3 Other applicable documents and papers
1. Data Sheet SA2531, SA2532
2. Pin-out comparison SA2531/2
4 Revision status
SAN3020 Application Note (this document)
AN3020 Schematic
Rev. B00
5 General description
Note: all further component references apply to the schematic shown in pt.9 of this application note !
SAN3020
PDS038-SA2531/2-002
Rev. B
21-03-00
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