AS3649-ZWLM

AS3649-ZWLM Datasheet

AS3649

Part	Datasheet
AS3649-ZWLM	AS3649-ZWLM (pdf)

Related Parts	Information
AS3649-ZWLT	AS3649-ZWLT

PDF Datasheet Preview
AS3649 2500mA High Current LED Flash Driver 1 General Description The AS3649 is an inductive high efficient DCDC step up converter with two current sources. The DCDC step up converter operates at a fixed frequency of 4MHz and includes soft startup to allow easy integration into noise sensitive RF systems. The two current sources can operate in flash / torch or video light modes. The AS3649 includes flash timeout, overvoltage, overtemperature, undervoltage and LED short/open circuit protection functions. A TXMASK/TORCH function reduces the flash current in case of parallel operation to the RF power amplifier and avoids a system shutdown. Alternatively this pin can be used to directly operate the torch light directly. If the TXMask function is not used, it can be used as a hardware torch input programmable . A hardware NTC pin can be used to measure the LED temperature with the ADC and to automatically reduce the LED current if a temperature threshold is exceeded. The AS3649 is controlled by an I2C interface and has a hardware reset pin ON. Setting ON=0 resets the AS3649. Interface input voltage levels are 1.8V compliant. The AS3649 is available in a space-saving WL-CSP package measuring only 2.06x2.02x0.6mm and operates over the -30ºC to +85ºC temperature range. Figure Typical Operating Circuit 2 Key Features efficiency 4MHz fixed frequency DCDC Boost converter with soft start allows small coils - Stable even in coil current limit current adjustable up to 2x1000mA 2x1250mA with current boost or 2000mA and automatic load balancing for two LEDs current adjustment for low battery voltage operation for lower output current for reliable light output of the LED can run at 31.5kHz to avoid audible noise functions Automatic Flash Timeout timer to protect the LED s Overvoltage and undervoltage Protection Overtemperature Protection LED short/open circuit protection to measure LED temperature to automatically reduce the flash current if the LED temperature is too high programmable level Interface with hardware reset pin in tiny WL-CSP Package, 16 balls 0.5mm pitch, 2.06x2.02x0.6mm package size 3 Applications Flash/Torch for mobile phones AS3649 1 - 39 AS3649 Datasheet - Pin Assignments 4 Pin Assignments Figure Pin Assignments Top View AS3649 Pin Description Table Pin Description for AS3649 Pin Number1 A1 A2 A3 A4 B1 B2 B3 C1 C2 Pin Name PGND2 PGND1 ON SW2 SW1 NTC TXMASK/TORCH VOUT2 VOUT1 Power ground make a short connection between all GND balls Power ground make a short connection between all GND balls Positive supply voltage input - connect to supply and make a short connection to input capacitor CVIN and to coil LDCDC Hardware reset input an active low signal resets the registers of AS3649 and enters shutdown and I2C lines SDA and SCL are in high-Z , active high allows to operate the device DCDC converter switching node - make a short connection to SW1 / coil LDCDC DCDC converter switching node - make a short connection to SW2 / coil LDCDC LED temperature sensor input NTC for LED overtemperature protection Function 1 Connect to RF power amplifier enable signal - reduces currents during flash to avoid a system shutdown due to parallel operation of the RF PA and the flash driver Function 2 Operate torch current level without using the I2C interface to operate the torch without need to start a camera processor if the I2C is connected to the camera processor DCDC converter output capacitor - make a short connection to CVOUT / VOUT1 Datasheet - Ordering Information 11 Ordering Information The devices are available as the standard products shown in Table Table Ordering Information Ordering Code Delivery Form AS3649-ZWLT 2500mA High Current LED Flash Driver Tape & Reel Z Temperature Range -30ºC - 85ºC WL Package Wafer Level Chip Scale Package WL-CSP 2.06x2.02x0.6mm T Delivery Form Tape & Reel Package 16-pin WL-CSP 2.06x2.02x0.6mm 0.5mm pitch RoHS compliant / Pb-Free / Green Note All products are RoHS compliant and ams green. Buy our products or get free samples online at Technical Support is available at For further information and requests, email us at or find your local distributor at 38 - 39 AS3649 Datasheet - Ordering Information Copyrights Copyright 1997-2013, ams AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. 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 or registered trademarks of their respective companies. Disclaimer Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. ams 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. ams 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 ams 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 ams AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by ams AG is believed to be correct and accurate. However, ams 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 ams AG rendering of technical or other services. Contact Information Headquarters ams AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: 39 - 39

PDF Datasheet Preview

AS3649
2500mA High Current LED Flash Driver
1 General Description

The AS3649 is an inductive high efficient DCDC step up converter with two current sources. The DCDC step up converter operates at a fixed frequency of 4MHz and includes soft startup to allow easy integration into noise sensitive RF systems. The two current sources can operate in flash / torch or video light modes.

The AS3649 includes flash timeout, overvoltage, overtemperature, undervoltage and LED short/open circuit protection functions. A TXMASK/TORCH function reduces the flash current in case of parallel operation to the RF power amplifier and avoids a system shutdown. Alternatively this pin can be used to directly operate the torch light directly. If the TXMask function is not used, it can be used as a hardware torch input programmable .

A hardware NTC pin can be used to measure the LED temperature with the ADC and to automatically reduce the LED current if a temperature threshold is exceeded.

The AS3649 is controlled by an I2C interface and has a hardware reset pin ON. Setting ON=0 resets the AS3649. Interface input voltage levels are 1.8V compliant.

The AS3649 is available in a space-saving WL-CSP package measuring only 2.06x2.02x0.6mm and operates over the -30ºC to +85ºC temperature range.

Figure Typical Operating Circuit
2 Key Features
efficiency 4MHz fixed frequency DCDC Boost converter with soft start allows small coils - Stable even in coil current limit
current adjustable up to 2x1000mA 2x1250mA with current boost or 2000mA and automatic load balancing for two LEDs
current adjustment for low battery voltage
operation for lower output current for reliable light output of the LED can run at 31.5kHz to avoid audible noise
functions Automatic Flash Timeout timer to protect the LED s Overvoltage and undervoltage Protection Overtemperature Protection LED short/open circuit protection
to measure LED temperature
to automatically reduce the flash current if the LED temperature is too high programmable level

Interface with hardware reset pin
in tiny WL-CSP Package, 16 balls 0.5mm pitch, 2.06x2.02x0.6mm package size
3 Applications

Flash/Torch for mobile phones

AS3649
1 - 39

AS3649

Datasheet - Pin Assignments
4 Pin Assignments

Figure Pin Assignments Top View

AS3649

Pin Description

Table Pin Description for AS3649

Pin Number1 A1 A2 A3

A4 B1 B2 B3

C1 C2

Pin Name PGND2 PGND1

ON SW2 SW1 NTC

TXMASK/TORCH

VOUT2 VOUT1

Power ground make a short connection between all GND balls

Power ground make a short connection between all GND balls Positive supply voltage input - connect to supply and make a short connection to input capacitor CVIN and to coil LDCDC Hardware reset input an active low signal resets the registers of AS3649 and enters shutdown and I2C lines SDA and SCL are in high-Z , active high allows to operate the device DCDC converter switching node - make a short connection to SW1 / coil LDCDC

DCDC converter switching node - make a short connection to SW2 / coil LDCDC

LED temperature sensor input NTC for LED overtemperature protection Function 1 Connect to RF power amplifier enable signal - reduces currents during flash to avoid a system shutdown due to parallel operation of the RF PA and the flash driver Function 2 Operate torch current level without using the I2C interface to operate the torch without need to start a camera processor if the I2C is connected to the camera processor DCDC converter output capacitor - make a short connection to CVOUT / VOUT1
Datasheet - Ordering Information
11 Ordering Information

The devices are available as the standard products shown in Table
Table Ordering Information
Ordering Code

Delivery Form

AS3649-ZWLT
2500mA High Current LED Flash Driver

Tape & Reel

Z Temperature Range -30ºC - 85ºC WL Package Wafer Level Chip Scale Package WL-CSP 2.06x2.02x0.6mm T Delivery Form Tape & Reel

Package 16-pin WL-CSP 2.06x2.02x0.6mm
0.5mm pitch RoHS compliant / Pb-Free / Green

Note All products are RoHS compliant and ams green. Buy our products or get free samples online at

Technical Support is available at

For further information and requests, email us at or find your local distributor at
38 - 39

AS3649
Datasheet - Ordering Information

Copyrights

Copyright 1997-2013, ams AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. 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 or registered trademarks of their respective companies.

Disclaimer

Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. ams 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. ams 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 ams 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 ams AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by ams AG is believed to be correct and accurate. However, ams 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 ams AG rendering of technical or other services.

Contact Information

Headquarters ams AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01

For Sales Offices, Distributors and Representatives, please visit:
39 - 39

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived AS3649-ZWLM Datasheet file may be downloaded here without warranties.

Datasheet ID: AS3649-ZWLM 519695