AAT3685 AAT, AAT3685 Datasheet

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... 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 tem- perature range. ...

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... Connect resistor here to set charge current for low-current port. Connect resistor here to set charge current for high-current port. Exposed paddle (bottom); connect to GND directly beneath package. TDFN33-12 (Top View) ADP/USB SETH 1 12 BAT SETL 2 11 GND PWRSEL 3 10 CHR STAT1 STAT2 DATA 6 7 AAT3685 3685.2006.10.1.3 ...

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... AAT3685 Feature Options Internal Pull-Up Product Resistor on EN Pin AAT3685 No AAT3685-1 Yes 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 ...

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... IUL CHARGE Charging Devices Charging MOSFET Transistor R DS(ON)U On Resistance 1. The AAT3685 output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -25°C to +85°C temperature range is guaranteed by design. 4 Lithium-Ion/Polymer Battery Charger 1 Conditions Rising Edge CC Charge Current = 500mA AAT3685 ...

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... PERIOD f Data Output Frequency DATA T Over-Temperature Shutdown Threshold OVSD 1. The AAT3685 output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -25°C to +85°C temperature range is guaranteed by design. 3685.2006.10.1.3 Lithium-Ion/Polymer Battery Charger 1 Conditions AAT3685-1 Only, V STAT Pin Sinks 4mA ...

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... End of Charge Voltage vs. Temperature 4.242 4.221 4.200 4.179 4.158 50 75 100 -50 Preconditioning Charge Current vs. Temperature 120 110 100 100 -50 AAT3685 4.75 5 5.25 Supply Voltage (V) - Temperature (°C) (SETH; SETH = 3.83kΩ Ω Temperature (°C) 3685.2006.10.1.3 5.5 100 100 ...

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... Fast Charge Current vs. Supply Voltage 1200 1000 800 600 400 200 4.5 Fast Charge Current vs. Supply Voltage 1200 1000 800 600 400 200 0 6 6.5 4.40 AAT3685 (SETH; SETH = 3.83kΩ) 3 3.5 4 Battery Voltage (V) (SETH; SETH = 3.83kΩ Ω 3.3V BAT V = 3.9V BAT V = 3.5V BAT 4.25 4.5 4.75 5 5.25 5.5 Supply Voltage (V) (SETH ...

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... V BUS (400mV/div) Charge Current (400mA/div) Peripheral Current Consumption (400mA/div) 100 1000 AAT3685 V vs. Supply Voltage IL EN Pin (Falling) -40°C +25°C +85°C 4.4 4.6 4.8 5 5.2 5.4 5.6 Supply Voltage (V) V vs. Supply Voltage IL PWRSEL (Falling) -40°C +25°C +85°C 4.4 4.6 4.8 5 5.2 5.4 5.6 Supply Voltage (V) Charge Current vs. Time (SETH; SETH = 3.83kΩ Ω ) ...

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... Typical Characteristics Temperature Sense Output Current vs. Temperature -50 - Temperature (° ° C) 3685.2006.10.1.3 Lithium-Ion/Polymer Battery Charger 50 75 100 AAT3685 9 ...

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... CHR STAT1 STAT2 DATA EN Functional Description The AAT3685 is a highly integrated single cell lithi- um-ion/polymer battery charger IC designed to operate from adapter or USB port V while requiring a minimum number of external components. The device precisely regulates bat- tery charge voltage and current for 4.2V lithium- ion/polymer battery cells ...

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... TS pin from the bat- tery, must be within the proper window for safe charging. When these conditions have been met and a battery is connected to the BAT pin, the AAT3685 checks the state of the battery. If the cell voltage is below the Preconditioning Voltage Threshold (V the AAT3685 begins preconditioning the cell ...

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... V Charge MIN BAT No Current Yes Charging V > V Mode EOC BAT No Voltage Yes Charging I > I Mode BAT TERM No Charge Completed AAT3685 Input Power Input Detect PWRSEL= ? Input Voltage Regulation Enable No Port Voltage Test V < V ADP/USB ADP/USB_CHR Yes Charge Current Reduction 3685.2006.10.1.3 ...

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... In the event a port being used to supply the charger is unable to provide the programmed fast charge current the system under charge must also share supply current with other func- tions, the AAT3685 will automatically reduce USB SETH SETL (kΩ Ω (kΩ Ω ) ...

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... AAT3685, the charge control will suspend charging until the source sup- ply is capable of supplying the minimum input cur- rent to charge. At this point, the AAT3685 will auto- 14 Lithium-Ion/Polymer Battery Charger matically resume charging in the appropriate mode based on the battery cell voltage ...

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... TS pin voltage lower than the TS1 threshold, and the AAT3685 will halt charging and signal the fault con- dition. required by the system, it should be terminated to ground using a 10kΩ ...

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... Note: Red LED forward voltage (V 2.0V @ 2mA. Table 2 shows the four status LED display conditions. Digital Charge Status Reporting The AAT3685 has a comprehensive digital data reporting system by use of the DATA pin feature. 1. Flashing rate depends on output capacitance. 16 Lithium-Ion/Polymer Battery Charger Table 2: LED Display Status Conditions. ...

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... SETL Constant Current Mode 21 SETL Constant Voltage Mode 22 SETL End of Charging 23 Data Report Error IN AAT3685 Status Control OUT 3685.2006.10.1.3 Lithium-Ion/Polymer Battery Charger Table 3: Serial Data Report Table. 1.8V to 5.0V R PULL_UP DATA Pin Figure 4: Data Pin Application Circuit. AAT3685 IN GPIO OUT μP GPIO Port 17 ...

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... Eq [( · BAT CC 18 Lithium-Ion/Polymer Battery Charger the AAT3685 status data control will reply the data word back to the system microcontroller after a delay specified by the data report time specification T . Upon sensing DATA(RPT) pulses will be specified by the T P DATA T LAT < ...

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... 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, ...

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... AAT3685 Evaluation Board Layout Figure 5: AAT3685 Evaluation Board Component Side Layout. 20 Lithium-Ion/Polymer Battery Charger Figure 6: AAT3685 Evaluation Board Solder Side Layout. AAT3685 3685.2006.10.1.3 ...

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... AAT3685 Evaluation Board Schematic Diagram Mini-B GND ADP/USB 1 C2 TB1 10μF ADP/USB 1 GND 2 BAT GND 3 TB2 C1 10μF 3685.2006.10.1.3 Lithium-Ion/Polymer Battery Charger ON/OFF PWRSEL AAT3685 Open Open 10 PWRSEL 1 ADP/USB STAT2 ...

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... AAT3685 Evaluation Board Bill of Materials (BOM) Quantity Description 1 Test Pin 1 Connecting Terminal Block, 2.54mm, 2 Pos 1 Connecting Terminal Block, BAT, GND, TS 2.54mm, 3 Pos 1 USB 2.0 Receptacle, 5 Pos 2 Capacitor, Ceramic, 10μF 6.3V 10% X5R 0805 1 Typical Red LED, Super Bright 1 Typical Green LED 2 Header, 3-Pin 1 Resistor, 10kΩ 1/16W 5% ...

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... Index Area (D/2 x E/2) Detail "B" 1.70 ± 0.05 Bottom View Option A: Option B: C0.30 (4x) max R0.30 (4x) max Chamfered corner Round corner Detail "A" AAT3685 Part Number (Tape and Reel) 2 AAT3685IWP-4.2-T1 AAT3685IWP-4.2-1-T1 0.3 ± 0.10 0.16 0.375 ± 0.125 0.075 ± 0.075 0.1 REF Pin 1 Indicator (optional) Detail "B" 23 ...