 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
AAT3681IJS-4.2-T1 Datasheet(PDF) 11 Page - Advanced Analog Technology, Inc. |
|
||||||||||||||||||||||||||||||
AAT3681IJS-4.2-T1 Datasheet(HTML) 11 Page - Advanced Analog Technology, Inc. |
|
|
11 / 15 page  Application Information Adapter or USB Power Input Constant current charge levels up to 300mA may be programmed by the user when powered from a sufficient input power source. The AAT3681 will operate from the adapter input over a 4.0V to 6.5V range. The constant current fast charge current for the adapter input is set by the RSET resistor con- nected between ISET and ground. Refer to Table 1 for recommended RSET values for a desired con- stant current charge level. Adapter Input Charge Inhibit and Resume The AAT3681 has a UVLO and power on reset fea- ture so that if the input supply to the ADP pin drops below the UVLO threshold, the charger will sus- pend charging and shut down. When power is re- applied to the ADP pin or the UVLO condition recovers, the system charge control will assess the state of charge on the battery cell and will auto- matically resume charging in the appropriate mode for the condition of the battery. Enable / Disable The AAT3681 provides an enable function to con- trol the charger IC on and off. The enable (EN) pin is internally pulled down. When pulled to a logic high level, AAT3681 is enabled. When left open or pulled to a logic low level, the AAT3681 will be shut down and forced into the sleep state. Charging will be halted regardless of the battery voltage or charging state. When the device is re-enabled, the charge control circuit will automatically reset and resume charging functions with the appropriate charging mode based on the battery charge state and measured cell voltage on the BAT pin. Programming Charge Current The fast charge constant current charge level is user programmed with a set resistor placed between the ISET pin and ground. The accuracy of the fast charge, as well as the preconditioning trick- le charge current, is dominated by the tolerance of the set resistor used. For this reason, a 1% toler- ance metal film resistor is recommended for the set resistor function. Fast charge constant current lev- els from 15mA to 300mA may be set by selecting the appropriate resistor value from Table 1. Table 1: RSET Values. Figure 2: Constant Charging Current vs. Set Resistor Values. Protection Circuitry Over-Voltage Protection An over-voltage event is defined as a condition where the voltage on the BAT pin exceeds the maximum battery charge voltage and is set by the over-voltage protection threshold (VOVP). If an over- voltage condition occurs, the AAT3681 charge con- trol will shut down the device until voltage on the BAT pin drops below VOVP. The AAT3681 will resume normal charging operation after the over- voltage condition is removed. Over-Temperature Shutdown The AAT3681 has a thermal protection control circuit which will shut down charging functions should the internal die temperature exceed the preset thermal limit threshold. Once the internal die temperature falls below the thermal limit, normal operation will resume the previous charging state. RSET (k Ω Ω) 1 10 100 1000 1 10 100 1000 Nominal Set Resistor ICHARGE (mA) Value (k Ω Ω) 300 5.36 250 6.49 200 8.06 150 10.7 100 16.2 50 31.6 40 38.3 30 53.6 20 78.7 15 105 AAT3681 USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger 3681.2007.01.1.2 11 |
Similar Part No. - AAT3681IJS-4.2-T1 |
|
Similar Description - AAT3681IJS-4.2-T1 |
|
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
