Electronic Components Datasheet Search |
|
AAT3682 Datasheet(PDF) 11 Page - Skyworks Solutions Inc. |
|
AAT3682 Datasheet(HTML) 11 Page - Skyworks Solutions Inc. |
11 / 18 page AAT3682 DATA SHEET Li-Ion/Polymer Linear Battery Charger 11 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201884B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012 Sleep / Charge Complete Temp., OC, OV Fault Battery Conditioning Constant Current Mode Constant Voltage Mode off / off / off / off on / on / off / off on / on / on / on on / off / off / off on / on / on / off Charge Status Output Status LED Display on/off ON OFF ON OFF ON OFF ON OFF ON OFF on/off on/off on/off Figure 3: LED Display Output. Resuming Charge and the VRCH Threshold The AAT3682 will automatically resume charging under most conditions when a battery charge cycle is inter- rupted. Events such as an input supply interruption or under voltage, removal and replacement of the battery under charge, or charging a partially drained battery are all possible. The AAT3682 will monitor the battery volt- age and automatically resume charging in the appropri- ate mode based upon the measured battery cell voltage. This feature is useful for systems with an unstable input supply, which could be the case when powering a char- ger from a USB bus supply. It is also beneficial for charg- ing or “topping off” partially discharged batteries. The only restriction on resuming charge of a battery is that the battery cell voltage must be below the battery recharge voltage threshold (VRCH) specification. There is VRCH threshold hysteresis built into the charge control system. This is done to prevent the charger from errone- ously turning on and off once a battery charge cycle is complete. For example, the AAT3682 has a typical VRCH threshold of 4.1V. A battery under charge is above 4.1V, but is still in the constant voltage mode because it has not yet reached 4.2V to complete the charge cycle. If the battery is removed and then placed back on the charger, the charge cycle will not resume until the battery voltage drops below the VRCH threshold. In another case, a bat- tery under charge is in the constant current mode and the cell voltage is 3.7V when the input supply is inadver- tently removed and then restored. The battery is below the VRCH threshold and the charge cycle will immediately resume where it left off. LED Display Charge Status Output The AAT3682 provides a battery charge status output via the STAT pin. STAT is an open-drain serial data output capable of displaying five distinct status functions with one LED connected between the STAT pin and VP. There are four periods which determine a status word. Under default conditions, each output period is one second long; thus one status word will take four seconds to dis- play through an LED. The five modes include: 1. Sleep/Charge Complete: The IC goes into Sleep mode when no battery is present -OR- when the charge cycle is complete. 2. Fault: When an over-current (OC) condition is detected by the current sense and control circuit -OR- when an over-voltage (OV) condition is detect- ed at the BAT pin -OR- when a battery over-temper- ature fault is detected on the TEMP pin. 3. Battery Conditioning: When the charge system is in 1X or 2X trickle charge mode. 4. Constant Current (CC) Mode: When the system is in constant current charge mode. 5. Constant Voltage (CV) Mode: When the system is in constant voltage charge mode. An additional feature of the LED status display is for a Battery Not Detected state. When the AAT3682 senses there is no battery connected to the BAT pin, the STAT output will turn the LED on and off at a rate dependent on the size of the output capacitor being used. The LED cycles on for two periods then remains off for two peri- ods. See Figure 3 below. |
Similar Part No. - AAT3682_12 |
|
Similar Description - AAT3682_12 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |