AAT3681AIJS-4.2-2-T1

DATA SHEET AAT3681A 500mA USB Port or AC Adapter Li-Ion/Polymer Battery Charger General Description Features The AAT3681A BatteryManager is an integrated single cell lithium-ion/polymer battery charger IC, designed to operate from a DC power source or USB port up to an input voltage of 7.5V. It requires just one external component. • USB or AC Adapter System Power Charger ▪ Programmable from 15mA to 500mA • 4.0V ~ 7.5V Input Voltage Range • High Level of Integration with Internal: ▪ Charging Device ▪ Reverse Blocking Diode Constant Regulated Output Voltage: ▪ 4.1 in AAT3681A-5 ▪ 4.2 in AAT3681A-1/-2/-4 • Automatic Current Sensing • Automatic Recharge Sequencing • Full Battery Charge Auto Turn Off/Sleep Mode/Charge Termination • Shutdown Current VUVLO Yes Shut Down Yes Fault Conditions Monitoring OV, OT Charge Control No (AAT3681A, AAT3681A-2, AAT3681A-5) No (AAT3681A-1, AAT3681A-4) Preconditioning Test V MIN > VBAT Yes Preconditioning (Trickle Charge) Yes Constant Current Charge Mode No No Recharge Test V RCH > VBAT Yes Current Phase Test V CO(REG) > VBAT No Voltage Phase Test IBAT > ITERM Yes No Constant Voltage Charge Mode No (AAT3681A, AAT3681A-1, AAT3681A-2, AAT3681A-4, AAT3681A-5, AAT3681A-6) Charge Completed Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201883C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 19, 2012 11 DATA SHEET AAT3681A 500mA USB Port or AC Adapter Li-Ion/Polymer Battery Charger Application Information Adapter or USB Power Input Constant current charge levels up to 500mA may be programmed by the user when powered from a sufficient input power source. The AAT3681A will operate from the adapter input over a 4.0V to 7.5V range. The constant current fast charge current for the adapter input is set by the RSET resistor connected between ISET and ground. Refer to Table 1 for recommended RSET values for a desired constant current charge level. Adapter Input Charge Inhibit and Resume 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 trickle charge current, is dominated by the tolerance of the set resistor used. For this reason, a 1% tolerance metal film resistor is recommended for the set resistor function. Fast charge constant current levels from 15mA to 500mA may be set by selecting the appropriate resistor value from Table 1. Nominal ICHARGE (mA) Set Resistor Value (kW) 500 450 400 350 300 250 200 150 100 50 40 30 20 15 3.24 3.57 4.12 4.64 5.36 6.49 8.06 10.7 16.2 31.6 38.3 53.6 78.7 105 The AAT3681A has a UVLO and power on reset feature so that if the input supply to the ADP pin drops below the UVLO threshold, the charger will suspend 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 automatically resume charging in the appropriate mode for the condition of the battery. Enable / Disable The AAT3681A provides an enable function to control the charger IC on and off. The EN pin functions as follows on the various AAT3681A options: AAT3681A-2: The enable (EN) pin is internally pulled down. When left open or pulled to a logic low level, the AAT3681A-2 is enabled. When pulled to a logic high level, the AAT3681A-2 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. Constant Current Table 1:Charging RSET Values. vs. Set Resistor Values 1000 ICH (mA) AAT3681A, AAT3681A-1, AAT3681A-4, and AAT3681A-5: The enable (EN) pin is internally pulled down through a 6MΩ resistor. When pulled to a logic high level, the AAT3681A is enabled. When left open or pulled to a logic low level, the AAT3681A will be shut down and forced into the sleep state. 100 10 1 1 10 100 1000 RSET (kΩ) 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 12 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201883C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 19, 2012 DATA SHEET AAT3681A 500mA USB Port or AC Adapter Li-Ion/Polymer Battery Charger Over-Temperature Shutdown The AAT3681A 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. Charge Status Output The AAT3681A provides battery charge status via a status pin. This pin is internally connected to an N-channel open drain MOSFET, which can be used to drive an external LED. The status pin can indicate the following conditions: Event Description Status No battery charging activity Battery charging via adapter or USB port Charging completed OFF ON OFF Table 2: LED Status Indicator. The LED should be biased with as little current as necessary to create reasonable illumination; therefore, a ballast resistor should be placed between the LED cathode and the STAT pin. LED current consumption will add to the overall thermal power budget for the device package, hence it is good to keep the LED drive current to a minimum. A 2mA should be sufficient to drive most lowcost green or red LEDs. It is not recommended to exceed 8mA for driving an individual status LED. The required ballast resistor values can be estimated using the following formulas: R1 = (VADP - VF(LED)) ILED Thermal Considerations The AAT3681A is offered in a SC70JW-8 package which can provide up to 687mW of power dissipation when it is properly bonded to a printed circuit board and has a maximum thermal resistance of 160°C/W. Many considerations should be taken into account when designing the printed circuit board layout, as well as the placement of the charger IC package in proximity to other heat generating devices in a given application design. The ambient temperature around the charger IC will also have an effect on the thermal limits of a battery charging application. The maximum limits that can be expected for a given ambient condition can be estimated by the following discussion. First, the maximum power dissipation for a given situation should be calculated: PD(MAX) = (TJ(MAX) - TA) θJA Where: PD(MAX) = Maximum Power Dissipation (W) qJA = Package Thermal Resistance (°C/W) TJ(MAX) = Maximum Device Junction Temperature (°C) [135°C] TA = Ambient Temperature (°C) Figure 3 shows the relationship of maximum power dissipation and ambient temperature of AAT3681A. 1000 800 PD(MAX) (mW) occurs, the AAT3681A charge control will shut down the device until the voltage on the BAT pin drops below VOVP. The AAT3681A will resume normal charging operation after the over-voltage condition is removed. 600 400 200 0 0 20 40 60 80 100 TA (°C) Example: R1 = (5.5V - 2.0V) = 1.75kΩ 2mA Figure 3: Maximum Power Dissipation. Note: Red LED forward voltage (VF) is typically 2.0V @ 2mA. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201883C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 19, 2012 13 DATA SHEET AAT3681A 500mA USB Port or AC Adapter Li-Ion/Polymer Battery Charger Next, the power dissipation can be calculated by the following equation: PD = [(VIN - VBAT) · ICH + (VIN · IOP)] Where: PD = VIN = VBAT = ICH = IOP Total Power Dissipation by the Device Input Voltage Battery Voltage as Seen at the BAT Pin Constant Charge Current Programmed for the  Application = Quiescent Current Consumed by the Charger IC for Normal Operation [0.5mA] By substitution, we can derive the maximum charge current before reaching the thermal limit condition (thermal cycling). The maximum charge current is the key factor when designing battery charger applications. ICH(MAX) = (PD(MAX) - VIN · IOP) VIN - VBAT (TJ(MAX) - TA) - V · I IN OP θJA ICH(MAX) = VIN - VBAT In general, the worst condition is the greatest voltage drop across the charger IC, when battery voltage is charged up to the preconditioning voltage threshold. Figure 4 shows the maximum charge current in different ambient temperatures without PCB thermal enhancements. 500 450 ICH(MAX) (mA) 400 TA = 25°C 350 Capacitor Selection Input Capacitor In general, it is good design practice to place a decoupling capacitor between the ADP pin and GND. An input capacitor in the range of 1µF to 22µF is recommended. If the source supply is unregulated, it may be necessary to increase the capacitance to keep the input voltage above the under-voltage lockout threshold during device enable and when battery charging is initiated. If the AAT3681A adapter input is to be used in a system with an external power supply source, such as a typical AC-to-DC wall adapter, then a CIN capacitor in the range of 10µF should be used. A larger input capacitor in this application will minimize switching or power transient effects when the power supply is “hot plugged” in. Output Capacitor The AAT3681A only requires a 1µF ceramic capacitor on the BAT pin to maintain circuit stability. This value should be increased to 10µF or more if the battery connection is made any distance from the charger output. If the AAT3681A is to be used in applications where the battery can be removed from the charger, such as with desktop charging cradles, an output capacitor greater than 10µF may be required to prevent the device from cycling on and off when no battery is present. Printed Circuit Board Layout Considerations For the best results, it is recommended to physically place the battery pack as close as possible to the AAT3681A BAT pin. To minimize voltage drops on the PCB, keep the high current carrying traces adequately wide. Refer to the AAT3681A evaluation board for a good layout example (see Figures 5 and 6). TA = 45°C 300 250 200 150 100 50 TA = 85°C 0 4.25 4.5 4.75 TA = 60°C 5 5.25 5.5 5.75 6 6.25 6.5 6.75 7 VIN (V) Figure 4: Maximum Charging Current Before Thermal Cycling Becomes Active. 14 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201883C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 19, 2012 DATA SHEET AAT3681A 500mA USB Port or AC Adapter Li-Ion/Polymer Battery Charger Figure 5: AAT3681A Evaluation Board Figure 6: AAT3681A Evaluation Board Top Side Layout. Bottom Side Layout. VBAT VIN(ADP) JP2 C1 10µF 1 2 3 4 R8 8.06K AAT3681A EN ISET BAT ADP GND GND GND STAT 8 7 6 5 C2 2.2µF U1 (SC70JW-8) JP1 0Ω D1 R1 RED LED 1K Figure 7: AAT3681A Evaluation Board Schematic Diagram. Component Part Number Description Manufacturer U1 R1 R8 JP1 C1 C2 JP2 LED1 AAT3681AIJS-T1 Chip Resistor Chip Resistor Chip Resistor GRM21BR61A106KE19L GRM21BR71A225KA01L PRPN401PAEN CMD15-21SRC/TR8 USB/ADP Battery Charger; SC70JW-8 Package 1kW, 5%, 1/4W; 0603 8.06kW, 1%, 1/4W; 0805 0W, 5%, 1/4W; 0603 Ceramic 10µF 10V 10% X5R 0805 Ceramic 2.2µF 10V 10% X7R 0805 Connecting Header, 2mm Zip Red LED; 1206 Skyworks Vishay Murata Sullins Electronics Chicago Miniature Lamp Table 3: AAT3681A Evaluation Board Bill of Materials. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201883C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 19, 2012 15 DATA SHEET AAT3681A 500mA USB Port or AC Adapter Li-Ion/Polymer Battery Charger Ordering Information Trickle Charge Enable Package Marking1 Part Number (Tape and Reel)2 Yes Yes No Yes No Yes Active High Active High Active High Active Low Active High Active High SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 SC70JW-8 E4XYY UTXYY UEXYY VSXYY A9XYY F2XYY AAT3681AIJS-4.1-T1 AAT3681AIJS-4.2-T1 AAT3681AIJS-4.2-1-T1 AAT3681AIJS-4.2-2-T1 AAT3681AIJS-4.2-4-T1 AAT3681AIJS-4.1-5-T1 Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. Package Information SC70JW-8 2.20 ± 0.20 1.75 ± 0.10 0.50 BSC 0.50 BSC 0.50 BSC 0.225 ± 0.075 2.00 ± 0.20 0.100 0.15 ± 0.05 0.45 ± 0.10 4° ± 4° 0.05 ± 0.05 7° ± 3° 1.10 MAX 0.85 ± 0.15 0.048REF 2.10 ± 0.30 All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 16 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201883C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 19, 2012 DATA SHEET AAT3681A 500mA USB Port or AC Adapter Li-Ion/Polymer Battery Charger Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201883C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 19, 2012 17