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AS3685A Datasheet(PDF) 17 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) 17 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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AS3685A/AS3685B
Datasheet
www.austriamicrosystems.com/
AS3685
(ptr)
Revision 2.2
16 - 24
7.3 Protection Functions
7.3.1 Overtemperature Protection
If the AS3685 junction temperature exceeds TOVTEMP, the current sink will be disabled and the charge pump
forced into 1:1 mode. If the junction temperature drops below TOVTEMP – TOVTEMPHYST, the device enables the
current sink again and the charge pump resumes normal operation.
7.3.1.1 LED Shortcircuit protection
If the LED is shorted (VCP to ILED), then depending on the set current and the resulting high power dissipation
inside the AS3685, the overtemperature protection will trigger. This protects the AS3685 and the system against
damage. If the AS3685 is in off-mode, then shorting of the diode will have no influence on the system.
Note: Do not short VCP to VSS if the supply is not current limited (e.g. by an internal protection inside the
battery), as there is an internal diode between VBAT (anode) and VCP (cathode).
7.3.2 Flash Timeout
The flash duration of a single flash is limited automatically to tFLASHTIMEOUT (applies only for ‘Flash’ mode(s)).
This protects the flash LED against thermal damage.
7.4 Layout Recommendations
To improve the heat dissipation, use a massive ground plane.
Figure 23 – AS3685 DFN10 3x3mm Layout Recommendation
Figure 24 – AS3685 WL-CSP 2x1.5mm Layout Recommendation
1
5
2
3
4
6
7
8
9
AS3685
CVCP
CBAT
CFLY1
CFLY2
RISET
VBAT
VSS
ILED
VCP
EN1
EN2
VIA, which is connected to
the ground plane, too
'Normal' VIA
10
Bottom Layer
Top Layer
Use ground place
connected to VSS
Use ground plane
connected to VSS
CFLY2
RISET
A1
CVCP
CFLY1
VSS
VBAT
EN1
VCP
EN2
ILED
VIA, which is connected to
the ground plane, too
'Normal' VIA
Micro VIA between
AS3685
Bottom Layer
Top Layer
Inner Layer
A1 A2 A3
B1 B2 B3
C1 C2 C3
D1 D2 D3


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