AMSCO AS3685A

AS3685A/AS3685B
Product Brief
austriamicrosystems
Product Brief
AS3685A/AS3685B
Ultra Small High Efficiency 700mA Charge Pump for White LED Flash
1 General Description
The AS3685 is low noise high efficiency capacitive
charge pump with 1:1, 1:1.5 and 1:2 operating
modes in a small 3x3mm DFN10 or a tiny 2x1.5mm
WL-CSP (Wafer Level Chip Scale Package)
package. It can drive one flash led at up to 700mA
current. It supports flash/torch and indicator mode
for the flash led.
Additionally the AS3685 limits the flash time
automatically to protect the flash LED.
Overtemperature Protection
Automatic 800ms Flash Timeout to protect the
flash LED (time factory programmable)
Two Device Variants:
− AS3685A: Direct control to select three
currents
− AS3685B: Single Pin Interface or Two Pin
Interface with Strobe Input; 17 different
currents can be selected
Package
− DFN10 3x3mm (10 pins + exposed pad)
− WL-CSP (Wafer Level Chip Scale Package)
3x4 balls 0.5mm pitch (2x1.5mm)
2 Key Features
High Efficiency capactive charge pump with 1:1,
1:1.5 and 1:2 modes
− 1:2 Mode can be disabled
(factory programmable)
Up to 700mA Led Current
Automatic Charge Pump Mode switching (Up)
LED cathode disconnect in Shutdown
3 Application
Flash / Torch for Mobile Phones, Digital
Cameras and PDA
4 Application Diagram
Figure 1 – Application Diagram of AS3685A/AS3685B
CFLY1 1.0 F
CFLY2 1.0 F
C1+ C1- C2+ C2VBAT
CBAT
2.2 F
VBAT
VCP
AS3685A
AS3685B
EN1
ILED
EN2
CVCP
2.2 F
DLED
ISET VSS
RTXMASK
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RISET
Revision 2.0 / 20060726
1-2
AS3685A/AS3685B
Product Brief
austriamicrosystems
Copyright
Copyright © 1997-2006, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, AustriaEurope. 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 owner.
All products and companies mentioned are trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent identification provisions
appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by
description regarding the information set forth herein or regarding the freedom of the described devices from
patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time
and without notice. Therefore, prior to designing this product into a system, it is necessary to check with
austriamicrosystems AG for current information. This product is intended for use in normal commercial
applications. Applications requiring extended temperature range, unusual environmental requirements, or high
reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not
recommended without additional processing by austriamicrosystems AG for each application.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not
limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect,
special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise
or flow out of austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters:
austriamicrosystems AG
Business Unit Communications
A 8141 Schloss Premstätten, Austria
T. +43 (0) 3136 500 0
F. +43 (0) 3136 5692
[email protected]
For Sales Offices, Distributors and Representatives, please visit:
www.austriamicrosystems.com
austriamicrosystems
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Revision 2.0 / 20060726
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