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AS3685A Datasheet(PDF) 18 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

Part No. AS3685A
Description  Ultra Small High Efficiency 1000mA Charge Pump
Download  25 Pages
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Maker  TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]
Homepage  http://www.taosinc.com
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AS3685A Datasheet(HTML) 18 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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AS3685A/AS3685B
Datasheet
www.austriamicrosystems.com/
AS3685
(ptr)
Revision 2.2
17 - 24
8
External Components
8.1 Capacitor and Resistor Selection
Use low-ESR ceramic capacitors with X7R or X5R dielectric. These capacitors allow good filtering and have a
wide temperature range. The connections of all external capacitors should be kept as short as possible. All
resistors should have a tolerance of ±1%.
8.2 Usage of PCB Wire Inductance
The inductance between the battery and pin VBAT can be used as a filter to reduce disturbance on the battery.
Instead of using one capacitor (CBAT) it is recommended to split CBAT into CBAT1 and CBAT2 with the capacitance
of
CBAT1 = CBAT2 = CBAT
It is recommended to apply a minimum of 20nH (maximum 200nH) with low impedance. This inductance can be
realized on the PCB without any discrete coil. Assuming that a 1mm signal line corresponds to approximately
1nH (valid if the length (L) is significantly bigger than the width (W) of the line (L/W <10)), a line length of
20mm < L < 200mm
is recommended. The shape of the line is not important.
Figure 25 – PCB Wire Inductance Example1
Figure 26 – PCB Wire Inductance Example2
8.3 External Component Specifications
Table
10 – External Components List
Part
Min
Value
Typ
Max
Tol
(Min)
Rating
(Max)
Notes
Package
(min)
CBAT
1
2.2
μF
+/-20%
6.3V
Ceramic, X5R
e.g. Murata GRM21BR71A225KA01L
0603
CFLY1, CFLY2
1.0
μF
+/-20%
6.3V
Ceramic, X5R
e.g. Murata GRM188R60J105K
0603
(0402, 0405)
CVCP
2.2
μF
+/-20%
6.3V
Ceramic, X5R
e.g. Murata GRM21BR71A225KA01L
0603
RISET
10k
Ω
130k
Ω
+/-1%
Current Set Resistor
0201
RTXMASK
See section ‘TXMask function’
+/-1%
TXMask Set Resistor
0201
DLED
Flash Led
Notes:
1. See section ‘Usage of PCB Wire Inductance’
Battery
Connector
VSS
VSS
AS3685
Pin VBAT
L
CBAT1
CBAT2
LTOTAL = L
Battery
Connector
VSS
VSS
AS3685
Pin VBAT
L1
CBAT1
CBAT2
LTOTAL = L1 + 10*L2


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