AAT3685-1 Advanced Analog Technology, Inc., AAT3685-1 Datasheet
AAT3685-1
Related parts for AAT3685-1
AAT3685-1 Summary of contents
Page 1
... LEDs. A serial interface output is available to report any one of 14 various status states to a microcontroller. The AAT3685 is available in a Pb-free, thermally-enhanced, space-saving 12-pin 3x3mm TDFN package and is rated over the -40°C to +85°C temperature range. Typical Application ...
Page 2
... SETH 1 12 BAT SETL 2 11 GND PWRSEL 3 10 CHR STAT1 STAT2 DATA PRODUCT DATASHEET PRODUCT DATASHEET AAT3685 AAT3685 3685.2007.12.1.4 3685.2007.12.1.4 ...
Page 3
... BatteryManager BatteryManager TM TM AAT3685 Feature Options Product Internal Pull-Up Resistor on EN Pin AAT3685 AAT3685-1 Absolute Maximum Ratings Symbol Description V ADP/USB Input Voltage, <30ms, Duty Cycle <10 ADP/USB Input Voltage, Continuous P V BAT, PWRSEL, SETH, SETL, STAT1, STAT2, DATA, TS, CHR Operating Junction Temperature Range ...
Page 4
... The AAT3685 output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -40°C to +85°C temperature range is guaranteed by design Lithium-Ion/Polymer Battery Charger Lithium-Ion/Polymer Battery Charger 1 Conditions Rising Edge CC Charge Current = 500mA AAT3685 4.25V BAT AAT3685- 4.25V BAT V = 4V, ADP/USB Pin Open BAT No Connection on CHR Pin CC Mode CC Mode SETH SETL ...
Page 5
... The AAT3685 output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -40°C to +85°C temperature range is guaranteed by design. 3685.2007.12.1.4 3685.2007.12.1.4 Lithium-Ion/Polymer Battery Charger Lithium-Ion/Polymer Battery Charger 1 Conditions AAT3685-1 Only STAT Pin Sinks 4mA For SETH Mode For SETL Mode For SETH Mode For SETL Mode ...
Page 6
... PRODUCT DATASHEET PRODUCT DATASHEET AAT3685 AAT3685 Battery Voltage vs. Supply Voltage 4.75 5 5.25 Supply Voltage (V) - Temperature (° ° C) (SETH; SETH = 3.83kΩ Ω ) ...
Page 7
... PRODUCT DATASHEET PRODUCT DATASHEET AAT3685 AAT3685 Charging Current vs. Battery Voltage (SETH; SETH = 3.83kΩ Ω ) 2.5 3 3.5 4 Battery Voltage (V) (SETH; SETH = 3.83kΩ Ω ...
Page 8
... Current (200mA/div) USB Peripheral Current Consumption (200mA/div) 1000 PRODUCT DATASHEET PRODUCT DATASHEET AAT3685 AAT3685 V vs. Supply Voltage IL EN Pin (Falling) -40°C +25°C +85°C 4.2 4.4 4.6 4 ...
Page 9
... Temperature (° ° C) 3685.2007.12.1.4 3685.2007.12.1.4 Lithium-Ion/Polymer Battery Charger Lithium-Ion/Polymer Battery Charger 75 100 PRODUCT DATASHEET PRODUCT DATASHEET AAT3685 AAT3685 9 9 ...
Page 10
... USB port V supply, but it can also be powered BUS from any input voltage source capable supplying 4.5V to 5.5V for loads up to 1A. The AAT3685 constant charge current can be externally programmed for two levels, SETH and SETL, for maximum constant current charge levels up to 1A. ...
Page 11
... When the input supply is disconnected, the charger will also automatically enter power-saving sleep mode. Only consuming an ultra-low 0.3μA in sleep mode (1μA for AAT3685-1), the AAT3685 minimizes battery drain when it is not charging. This feature is particularly useful in applications where the input supply level may fall below the battery charge or under-voltage lockout level ...
Page 12
... Mode BAT TERM No Charge Completed PRODUCT DATASHEET PRODUCT DATASHEET AAT3685 AAT3685 Input Power 0 Input Detect PWRSEL Input Voltage Regulation Enable No Port Voltage Test V < ...
Page 13
... Line Adapter or USB Source Most USB charging applications limit charging current to 500mA due to the limitations of a USB port as a power R12 source. The AAT3685 is capable of, and may be pro- R12 + R11 grammed for, constant current charge levels up to 1A. Thus, charging operation is not just restricted to use with USB port supplies ...
Page 14
... The AAT3685 provides an enable function to control the charger IC on and off. The enable (EN) pin is an active high. When pulled to a logic low level, the AAT3685 will be shut down and forced into the sleep state. Charging will be halted regardless of the battery voltage or charg- ing state ...
Page 15
... If the use of the TS pin function is not required by the system, it should be terminated to ground using a 10kΩ resistor. Alternatively, on the AAT3685-1, the TS pin may be left open. Battery Charge Status Indication The AAT3685 indicates the status of the battery under charge with two different systems ...
Page 16
... The system microcontroller should assert an active low data request pulse for minimum duration of 200ns; this is specified by T end of the data request pulse, the AAT3685 status data control will reply the data word back to the system micro- controller after a delay specified by the data report time ...
Page 17
... P OFF DATA Thermal Considerations The AAT3685 is packaged in a Pb-free, 3x3mm TDFN package which can provide up to 2.0W of power dissipa- tion when it is properly bonded to a printed circuit board and has a maximum thermal resistance of 50°C/W. Many considerations should be taken into account when ...
Page 18
... If the AAT3685 input used in a system with an external power supply source rather than a USB port V , such as a typical AC-to-DC wall adapter, then a C BUS capacitor in the range of 10μ ...
Page 19
... TDFN33-12 Open 10K PRODUCT DATASHEET PRODUCT DATASHEET AAT3685 AAT3685 Figure 6: AAT3685 Evaluation Board Solder Side Layout. PWRSEL RED GRN LED D1 LED ...
Page 20
... BatteryManager BatteryManager TM TM AAT3685 Evaluation Board Bill of Materials (BOM) Quantity Description 1 Test Pin Connecting Terminal Block, 1 2.54mm, 2 Pos Connecting Terminal Block, 1 2.54mm, 3 Pos 1 USB 2.0 Receptacle, 5 Pos Capacitor, Ceramic, 10μF 2 6.3V 10% X5R 0805 1 Typical Red LED, Super Bright 1 Typical Green LED 2 Header, 3-Pin Resistor, 10kΩ ...
Page 21
... Bottom View 0.05 ± 0.05 Side View PRODUCT DATASHEET PRODUCT DATASHEET AAT3685 AAT3685 2 AAT3685IWP-4.2-T1 AAT3685IWP-4.2-1-T1 0.43 ± 0.05 0.1 REF C0.3 Pin 1 Indicator (optional) Detail "A" ...