ADT7221
Part List
Component
U1
*1
Q1
L1
C1
C2
C3
Description
Composite type with a PNP transistor
and schottky barrier diode
PNP transistor
Output filter inductor
Output filter capacitor
Bypass capacitor
Load capacitor for LDO
IC
Chip transistor
Chip inductor
Tantalum capacitor
Tantalum capacitor
Tantalum capacitor
Type
FP103
MMBT589LT1
47uH/590mA
47uF/10V
10uF/25V
1uF/10V
Value
*1 : For cost down , it is possible to use discrete component with a PNP transistor and a schottky barrier diode.
In this case, you make use the discrete components with proper electrical specification.
Table A
shows the required key electrical limits. It is recommended to use PNP and schottky barrier diode
having equivalent specification in the
Table A.
Table A
: Selection guide for the discrete components
Component
PNP
Collector Current
Schottky
Barrier Diode
Repetitive Peak Reverse Voltage
Average Rectified Current
-2
30
700
A
V
mA
Parameter
Collector to Emitter Voltage
Ratings
-20
Unit
V
Remarks
Recommend
‘2SB1424’ by ROHM or Equivalent IC
Recommend
‘RSX101M-30’ by ROHM or Equivalent
Pin Configuration
1
6
A50
2
5
3
4
* This specifications are subject to be changed without notice
Jun. 16. 2008 / Rev. 0.1
2/6
http://www.ad-tech.co.kr
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