AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger General Description Features The AAT3686 BatteryManager is a highly integrated single-cell lithium-ion/polymer battery charger IC designed to operate with USB port and AC adapter inputs. It requires the minimum number of external components. The AAT3686 precisely regulates battery charge voltage and current for 4.2V lithium-ion/polymer battery cells. Adapter charge current rates can be programmed up to 1.5A. In the absence of an adapter and with a USB port connected, the battery can also be charged by USB power. Depending on the USB port type, the AAT3686 charge current can be programmed for two separate levels up to 500mA. An optional Charge Reduction Loop is also built in to allow users to charge the battery with available current from a USB port, while keeping the port voltage regulated. USB charging is disabled when an adapter is present. Battery temperature and charge state are fully monitored for fault conditions. In the event of an over-voltage or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the battery under charge. Status monitor output pins are provided to indicate the battery charge status by directly driving two external LEDs. A serial interface output is available to report 22 various status states to a microcontroller. The AAT3686 is available in a Pb-free, thermallyenhanced, space-saving TDFN34-16 (3x4mm) or TDFN44-16 (4x4mm) package and is rated over the -40°C to +85°C temperature range. • • • • • • • • • • • • • • BatteryManager™ USB Port/AC Adapter System Power Charger — USB: Programmable to 500mA for USB Hi/Lo — Adapter: Programmable to 1.5A Max 4.0V to 5.5V Input Voltage Range Adapter Present Indicator (ADPP# Pin) Adapter Presence Automatically Disables USB Charging High Level of Integration With Internal: — Charging Devices — Reverse Blocking Diodes — Current Sensing Automatic Recharge Sequencing Digital Thermal Regulation in ADP Charge Charge Reduction Loop in USB Charge Battery Temperature Monitoring Full Battery Charge Auto Turn-Off Over-Voltage and Emergency Thermal Protection Power On Reset and Soft Start Serial Interface Status Reporting TDFN34-16 or TDFN44-16 Package Applications • • • • • • Typical Application Cellular Telephones Digital Still Cameras Hand-Held PCs MP3 Players Personal Data Assistants (PDAs) Other Lithium-Ion/Polymer Battery-Powered Devices Enable USB Input USB EN CHR USBSEL USB Hi/Lo Select RSETH BATT+ USBH BAT USBL TS AAT3686 RSETL C2 10μF CT BATTCT ADP Present ADPP# ADP Input GND ADP ADPSET RSET STAT1 DATA TEMP STAT2 Battery Pack Serial Data 3686.2006.10.1.9 1 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Pin Descriptions Pin # (TDFN34-16/ TDFN44-16) Name Type 1 2 3 4 5 USB BAT ADP GND CHR In In/Out In Ground In/Out 6 7 EN ADPP# In Out 8 9 10 11 12 TS DATA STAT2 STAT1 CT In/Out In/Out Out Out In/Out 13 14 15 16 EP USBSEL USBL USBH ADPSET In In/Out In/Out In/Out Function USB power supply input. Battery charging and sensing. Adapter input. Ground connection. Resistor divider to set USB voltage regulation for charge reduction mode. Leave this pin open for default 4.5V USB regulation point. Tie to USB pin to disable this function. Enable pin. Logic high enables the IC. Adapter present indicator. This pin is open drain until ADP pin reaches threshold. Connect to 10kΩ NTC thermistor. Status report to microcontroller via serial interface, open-drain. Battery charge status indicator pin to drive an LED: active low, open-drain. Battery charge status indicator pin to drive an LED: active low, open-drain. Timing capacitor to adjust internal watchdog timer. Set maximum charge time for adapter powered trickle, CC, and CV charge modes. The watchdog timer only sets the timers for adapter battery charging; there is no timeout for the battery charging from the USB input. If timing function is not needed, terminate this pin to ground. When USB is present, use this pin to toggle between 100mA and 500mA limit. Connect resistor here to set charge current for low-current USB port. Connect resistor here to set charge current for high-current USB port. Use resistor at this pin to set adapter charging current. Exposed paddle (bottom); connect to GND directly beneath package. Pin Configuration TDFN34-16 (Top View) USB BAT ADP GND CHR EN ADPP# TS 2 TDFN44-16 (Top View) 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 ADPSET USBH USBL USBSEL CT STAT1 STAT2 DATA USB BAT ADP GND CHR EN ADPP# TS 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 ADPSET USBH USBL USBSEL CT STAT1 STAT2 DATA 3686.2006.10.1.9 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger AAT3686 Feature Options Product Internal Pull-Up Resistor on EN Pin Can Leave TS Pin Open AAT3686 AAT3686-1 No Yes No Yes Absolute Maximum Ratings1 Symbol VP VP VN TJ TLEAD Description USB, ADP Input Voltage, <30ms, Duty Cycle <10% USB, ADP Input Voltage, Continuous BAT, USBSEL, USBH, USBL, ADPSET, STAT1, STAT2, ADPP#, DATA, TS, CT, CHR, EN Operating Junction Temperature Range Maximum Soldering Temperature (at leads) Value Units -0.3 to 7.0 -0.3 to 6.0 V V -0.3 to VP + 0.3 V -40 to 150 300 °C °C Value Units 37 2.7 °C/W W Thermal Information2 Symbol θJA PD Description Maximum Thermal Resistance Maximum Power Dissipation 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on an FR4 board. 3686.2006.10.1.9 3 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Electrical Characteristics1 VADP = 5V, TA = -25°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C. Symbol Operation USB, ADP VADPP VU_DSBL VUVLO IOP ISLEEP Description USB Port or Adapter Voltage Range Adapter Present Indicator Threshold Voltage ADP Voltage Level to Disable USB Charging Under-Voltage Lockout Under-Voltage Lockout Hysteresis Operating Current Sleep Mode Current Reverse Leakage Current from BAT Pin Voltage Regulation VBAT_EOC1 End of Charge Voltage Accuracy ΔVBAT/VBAT EOC Voltage Tolerance VMIN Preconditioning Voltage Threshold VRCH Battery Recharge Voltage Threshold VUSB_CHR USB Charge Reduction Regulation VCHR CHR Pin Voltage Accuracy Current Regulation ICH Charge Current ΔICH/ICH Charge Current Regulation Tolerance VADPSET ADPSET Pin Voltage VUSBH USBH Pin Voltage VUSBL USBL Pin Voltage KIA Current Set Factor: ICHARGE/IADPSET KIUH Current Set Factor: ICHARGE/IUSBH KIUL Current Set Factor: ICHARGE/IUSBL Charging Devices Adapter Charging Transistor RDS(ON)A On Resistance USB Charging Transistor RDS(ON)U On Resistance ILeakage Conditions Min Typ 4.0 USB Present 5.5 V 4.25 4.5 4.7 V 4.25 4.5 4.7 V Rising Edge 3.0 150 0.75 0.3 1 CC Charge Current = 500mA AAT3686: VBAT = 4.25V AAT3686-1: VBAT = 4.25V VBAT = 4V, USB, ADP Pins Open 1.5 1.0 3 1.0 4.158 No Connection on CHR Pin Max Units 2.8 4.2 0.5 3.0 4.3 1.9 VBAT_EOC - 0.1 4.5 2.0 100 µA µA 4.242 3.15 4.64 2.1 V % V V V V 1500 mA % V V V 10 2.0 2.0 2.0 4000 2000 2000 CC Mode CC Mode CC Mode V mV mA VIN = 5.5V 0.2 0.25 0.35 Ω VIN = 5.5V 0.4 0.5 0.65 Ω 1. The AAT3686 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 3686.2006.10.1.9 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Electrical Characteristics1 VADP = 5V, TA = -25°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C. Symbol Description Logic Control / Protection VUSBSEL(H) Input High Threshold VUSBSEL(L) Input Low Threshold VEN(H) Input High Threshold VEN(L) Input Low Threshold IEN(H) EN Input Current VADPP# Output Low Voltage TP Preconditioning Time Out (ADP mode only) Preconditioning and Constant Current Mode TC Time Out (ADP mode only) Constant Voltage Mode Time Out TV (ADP mode only) VSTAT Output Low Voltage ISTAT STAT Pin Current Sink Capability VOVP Over-Voltage Protection Threshold ITK/ICHG ITERM/ICHG ITS Pre-Charge Current Charge Termination Threshold Current TS Hot Temperature Fault TS2 TS Cold Temperature Fault DATA Pin Sink Current ADPP# Current Sink Capability Input High Threshold Input Low Threshold Status Request Pulse Width System Clock Period Data Output Frequency Thermal Loop Regulation Thermal Loop Entering Threshold Thermal Loop Exiting Threshold Over-Temperature Shutdown Threshold Min Typ Max 1.6 Units AAT3686-1 Only; VEN = 5V ADPP# Pin Sinks 4mA CCT = 100nF, V_ADP = 5.5V 25 V V V V µA V Minute CCT = 100nF, V_ADP = 5.5V 3.0 Hour CCT = 100nF, V_ADP = 5.5V 3.0 Hour 0.4 1.6 0.4 10 0.4 STAT Pin Sinks 4mA 0.4 For Adapter or USBH Mode For USBL Mode For Adapter or USBH Mode For USBL Mode Current Source from TS Pin TS1 I_DATA I_ADPP# VDATA(H) VDATA)(L) SQPULSE tPERIOD fDATA TREG TLOOP_IN TLOOP_OUT TOVSD Conditions Threshold Hysteresis Threshold Hysteresis DATA Pin is Active Low State ADPP# Pin is Active Low State 70 310 2.2 8.0 4.4 10 50 7.5 35 80 330 15 2.3 10 % % 90 350 2.4 3 8 1.6 0.4 Status Request 200 50 20 90 110 85 145 V mA V µA mV V mV mA mA V V ns µs kHz °C °C °C °C 1. The AAT3686 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. 3686.2006.10.1.9 5 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics IFASTCHARGE vs. RSET Battery Voltage vs. Supply Voltage 4.242 4.221 1000 ADP VBAT (V) IFASTCHARGE (mA) 10000 USBL 100 10 USBH 1 USBH 4.200 ADP 4.179 10 4.158 4.5 100 4.75 5.0 5.25 5.5 Supply Voltage (V) RSET (kΩ) Recharge Voltage vs. Temperature End of Charge Voltage vs. Temperature 4.242 4.140 4.130 4.120 4.221 ADP 4.100 VBAT (V) VRCH (V) 4.110 4.090 USBH 4.080 4.070 ADP 4.200 USBH 4.179 4.060 4.050 4.040 -50 -25 0 25 50 75 4.158 -50 100 -25 0 Temperature (°C) 25 50 75 100 Temperature (°C) Preconditioning Threshold Voltage vs. Temperature Preconditioning Charge Current vs. Temperature (ADPSET = 8.06kΩ Ω; USBH = 8.06kΩ) 3.05 120 60 3.04 VMIN (V) USBH 3.01 3.00 2.99 ADP 2.98 2.97 110 55 ADP 100 50 USBH 90 45 ICH USB (mA) 3.02 ICH ADP (mA) 3.03 2.96 2.95 -50 -25 0 25 50 Temperature (°C) 6 75 100 80 -50 -25 0 25 50 75 40 100 Temperature (°C) 3686.2006.10.1.9 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics Fast Charge Current vs. Temperature Charging Current vs. Battery Voltage (ADPSET = 8.0kΩ Ω; USBH = 8.06kΩ) 1100 540 1080 530 500 1000 490 980 480 ADP 470 940 460 920 450 900 -50 -25 0 25 50 75 0.8 ICH (A) 510 1020 960 1.0 520 USBH 1040 ICH USB (mA) ICH ADP (mA) 1060 (Adapter; ADPSET = 8.06kΩ Ω) 1.2 0.6 0.4 0.2 0.0 440 100 2.5 2.9 3.3 Temperature (°C) (USBL; USBL = 40.2kΩ Ω) 600 120 500 100 400 80 ICH (mA) ICH (mA) 4.5 Charging Current vs. Battery Voltage (USBH; USBH = 8.06kΩ) 300 200 100 60 40 20 0 2.5 0 3.0 3.5 4.0 2.5 4.5 3.0 Battery Voltage (V) 3.5 4.0 4.5 Battery Voltage (V) Fast Charge Current vs. Supply Voltage Fast Charge Current vs. Supply Voltage (Adapter; ADPSET = 8.06kΩ Ω) (USBH; USBH = 8.06kΩ Ω) 600 1200 VBAT = 3.3V VBAT = 3.3V 500 1000 VBAT = 3.5V 800 VBAT = 3.9V ICH (mA) ICH (mA) 4.1 Battery Voltage (V) Charging Current vs. Battery Voltage 600 3.7 VBAT = 3.5V 400 100 0 4.5 5.0 Supply Voltage (V) 3686.2006.10.1.9 300 200 200 4.0 VBAT = 3.9V 400 5.5 6.0 0 4.0 4.25 4.5 4.75 5.0 5.25 5.5 5.75 6.0 Supply Voltage (V) 7 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics Fast Charge Current vs. Supply Voltage Fast Charge Current vs. Supply Voltage (USBL; USBL = 40.2kΩ Ω) (USBH; USBH = 8.06kΩ Ω) 120 600 VBAT = 3.5V 0°C 100 500 ICH (mA) ICH (mA) VBAT = 3.3V 80 VBAT = 3.9V 60 40 20 70°C 400 25°C 300 200 100 0 4.0 4.5 5.0 5.5 6.0 0 4.4 6.5 4.5 4.6 Supply Voltage (V) 5.0 EN Pin (Falling) 1.4 1.4 1.3 1.3 1.2 1.2 -40°C 1.1 +25°C 1.1 1.0 VIH (V) VIH (V) 4.9 VIL vs. Supply Voltage EN Pin (Rising) 0.9 0.8 -40°C +25°C 1.0 0.9 0.8 0.7 0.7 +85°C 0.6 0.6 0.5 +85°C 0.5 0.4 0.4 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 4.2 4.4 4.6 Supply Voltage (V) 5.0 5.2 5.4 5.6 VIH vs. Supply Voltage VIL vs. Supply Voltage USBSEL (Rising) USBSEL (Falling) 1.4 1.4 1.3 1.3 -40°C 1.1 4.8 6.0 5.8 6.0 1.2 +25°C 1.1 VIH (V) 1.0 0.9 0.8 0.7 -40°C +25°C 1.0 0.9 0.8 0.7 +85°C 0.6 5.8 Supply Voltage (V) 1.2 VIH (V) 4.8 Supply Voltage (V) VIH vs. Supply Voltage +85°C 0.6 0.5 0.5 0.4 0.4 4.2 4.4 4.6 4.8 5.0 5.2 5.4 Supply Voltage (V) 8 4.7 5.4 5.8 6.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 Supply Voltage (V) 3686.2006.10.1.9 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics USB Charge Current vs. Time Adapter Mode Supply Current vs. ADPSET Resistor (USBH; USBH = 8.06kΩ) 0.80 USB VBUS (200mV/div) 0.70 USB Charge Current (200mA/div) IQ (mA) 0.60 Constant Current 0.50 Charge Reduction Mode Activated 0.40 0.30 USB Peripheral Current Consumption (200mA/div) Pre-Conditioning 0.20 0.10 0.00 1 10 100 0 1000 2 4 6 8 10 Time (sec) ADPSET Resistor (kΩ Ω) Counter Timeout vs. Temperature CT Pin Capacitance vs. Counter Timeout 10 2.0 8 1.8 6 1.6 Capacitance (μ μF) Counter Timeout (%) (CT = 0.1µF) 4 2 0 -2 -4 -6 -8 Precondition Timeout 1.4 1.2 1.0 0.8 Precondition + Constant Current Timeout or Constant Voltage Timeout 0.6 0.4 0.2 -10 0.0 -50 -25 0 25 50 75 100 Temperature (°°C) 0 2 4 6 8 10 Time (hours) Temperature Sense Output Current vs. Temperature TS Pin Current (μA) 88 86 84 82 80 78 76 74 72 -50 -25 0 25 50 75 100 Temperature (°°C) 3686.2006.10.1.9 9 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Functional Block Diagram Reverse Blocking USB USBSEL USBH USBL CHR Current Compare Charge Reduction Loop CV/ Precharge Charge Control Constant Current UVLO OverTemperature Protect Current Compare ADPSET BAT ADP ADPP# STAT1 STAT2 DATA Reverse Blocking Voltage Sense 80µA TS Charge Status Serial Data Window Comparator IC enable Watchdog Timer CT EN GND Functional Description The AAT3686 is a highly integrated single-cell lithiumion/polymer battery charger IC designed to operate with USB port and AC adapter inputs, while requiring a minimum number of external components. The AAT3686 precisely regulates battery charge voltage and current for 4.2V lithium-ion/polymer battery cells. The adapter charge input constant current level can be programmed up to 1.5A for rapid charging applications. In the absence of a high current adapter input source, the AAT3686 can be powered from a USB port VBUS supply. Depending on the USB port type, the AAT3686 constant charge current can be externally programmed for two levels, USB high and USB low, for maximum constant current charge levels up to 500mA. Typically, the USB charge levels are set at 500mA and 100mA for the USBH and USBL modes; however, the user may program either mode to any level up to 500mA. The USBH/L mode has automatic Charge Reduction Loop control to allow users to charge the battery with limited available current from a USB port, while 10 maintaining the regulated port voltage. This system assures the battery charge function will not overload a USB port while charging if other system demands also share power with the respective port supply. The USB charge function is automatically disabled when an adapter input power source greater than 4.4V is present. Status monitor output pins are provided to indicate the battery charge status by directly driving two external LEDs. A serial interface output is available to report 22 various status states to a microcontroller. Battery temperature and charge state are fully monitored for fault conditions. In the event of an overvoltage or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the battery under charge. In addition to internal charge controller thermal protection, the AAT3686 also provides a temperature sense feedback function (TS pin) from the battery to shut down the device in the event the battery exceeds its own thermal limit during charging. All fault events are reported to the user either by the simple status LEDs or via the DATA pin function. 3686.2006.10.1.9 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Charging Operation Regardless of which charge input function is selected (i.e., either the adapter input or USB input), the AAT3686 has four basic modes for the battery charge cycle: pre-conditioning/trickle charge; constant current/fast charge; constant voltage; and end of charge (see Figure 1). Preconditioning Trickle Charge Phase Constant Current Charge Phase Constant Voltage Charge Phase Charge Complete Voltage I = Max CC Regulated Current Constant Current Mode Voltage Threshold Trickle Charge and Termination Threshold I = CC / 10 Figure 1: Current vs. Voltage Profile During Charging Phases. Battery Preconditioning Before the start of charging, the AAT3686 checks several conditions in order to assure a safe charging environment. The input supply must be above the minimum operating voltage, or under-voltage lockout threshold (VUVLO), for the charging sequence to begin. Also, the cell temperature, as reported by a thermistor connected to the TS pin from the battery, 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 AAT3686 checks the state of the battery. If the cell voltage is below the preconditioning voltage threshold (VMIN), the AAT3686 begins preconditioning the cell. The battery preconditioning trickle charge current is equal to the fast charge constant current divided by 10 (USBL divided by 2). For example, if the programmed fast charge current is 500mA, then the preconditioning mode (trickle charge) current will be 50mA. Cell preconditioning is a safety precaution for a deeply discharged battery and also aids in limiting power dissipation in the pass transistor when the voltage across the device is at the greatest potential. Fast Charge / Constant Current Charging Cell preconditioning continues until the voltage on the BAT pin exceeds the preconditioning voltage 3686.2006.10.1.9 threshold (VMIN). At this point, the AAT3686 begins the constant current fast charging phase. The fast charge constant current (ICC) amplitude is determined by the charge mode, ADP, USBH or USBL, and is programmed by the user via the RSET, RSETH, and RSETL resistors. The AAT3686 remains in constant current charge mode until the battery reaches the voltage regulation point, VBAT. Constant Voltage Charging The system transitions to a constant voltage charging mode when the battery voltage reaches the output charge regulation threshold (VBAT) during the constant current fast charge phase. The regulation voltage level is factory programmed to 4.2V (±1%). Charge current in the constant voltage mode drops as the battery cell under charge reaches its maximum capacity. End of Charge Cycle Termination and Recharge Sequence When the charge current drops to 7.5% (35% for USBL) of the programmed fast charge current level in the constant voltage mode, the device terminates charging and goes into a standby state. The charger will remain in a standby state until the battery voltage decreases to a level below the battery recharge voltage threshold (VRCH). 11 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger When the input supply is disconnected or drops below UVLO or EN = 0, the charger will automatically enter power-saving sleep mode. Consuming an ultra-low 0.3µA in sleep mode (1µA for AAT3686-1), the AAT3686 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. In such cases where the AAT3686 input voltage drops, the device will enter sleep mode and automatically resume charging once the input supply has recovered from its fault condition. System Operation Flow Chart Output ADPP Yes ADP Voltage Test ADP > VADPP ADP Yes Power Select Yes UVLO VP > VUVLO Switch On No No USB ADP Loop Power On Reset No Sleep Mode Enable 0 USB Low Current Loop USB Detect USBSEL = ? Thermal Loop Enable 1 USB High Current Loop No Timing Fault Conditions Monitor OV, OT Yes Yes Yes Shutdown Mode No Battery Temp. Monitor VTS1 < TS < VTS2 Device Temp. Monitor TJ > 110°C No Thermal Loop Current Reduction in ADP Charging Mode Expire Battery Temp. Fault Charge Safety Timer Timer No Recharge Test VRCH > VBAT Yes Preconditioning Test VMIN > VBAT Yes Low Current Conditioning Charge Yes Current Charging Mode Yes Voltage Charging Mode Set No Current Phase Test VEOC > VBAT No Voltage Phase Test IBAT > ITERM USB Loop Current Reduction in USB Charging Mode Yes No Charge Completed 12 USB Voltage Regulation Enable No USB Voltage Test VUSB < 4.5V 3686.2006.10.1.9 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Application Information AC Adapter / USB System Power Charging Adapter Mode In the adapter mode, constant current charge levels up to 1.5A can be programmed by the user. The AAT3686 system control will always select the adapter input over the USB supply input whenever adapter voltage is present on the ADP pin. The AAT3686 will operate from the adapter input over a 4.0V to 5.5V range. The constant current fast charge current for the adapter input mode is set by the RSET resistor connected between the ADPSET and ground. Refer to Table 1 for recommended RSET values for a desired constant current charge level. The presence of voltage on the adapter input is indicated by the ADPP# pin function. This indicator pin is an open drain and will pull the ADPP# pin low when voltage is detected on the ADP pin. The precise charging function in the adapter mode may be read from the DATA pin and/or status LEDs. Please refer to the Battery Charge Status Indication discussion in this datasheet for further details on data reporting. Thermal Loop Control Due to the integrated nature of the linear charging control pass device for the adapter mode, a special thermal loop control system has been employed to maximize charging current under all operation conditions. The thermal management system measures the internal circuit die temperature and reduces the fast charge current when the device exceeds a preset internal temperature control threshold. Once the thermal loop control becomes active, the fast charge current is initially reduced by a factor of 0.44. The initial thermal loop current can be estimated by the following equation: ITLOOP = ICC · 0.44 The thermal loop control re-evaluates the circuit die temperature every three seconds and adjusts the fast charge current back up in small steps to the full fast charge current level or until an equilibrium current is discovered and maximized for the given ambient temperature condition. The thermal loop 3686.2006.10.1.9 controls the system charge level; therefore, the AAT3686 will always provide the highest level of constant current in the fast charge mode possible for any given ambient temperature condition. Adapter Input Charge Inhibit and Resume The AAT3686 has an under-voltage lockout and power on reset feature so that the charger will suspend charging and shut down if the input supply to the adapter pin drops below the UVLO threshold. When power is re-applied to the adapter pin or the UVLO condition recovers and ADP > VBAT, 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. USB Mode The AAT3686 provides an input for intelligent USB charging. When no voltage is present on the adapter input pin, the charge controller will automatically switch to accepting power from the USB input. The USB charge mode provides two programmable fast charge levels up to 500mA each, USB high and USB low, USBH and USBL, respectively. The USBH or USBL modes may be externally selected by the USB select pin (USBSEL). USBSEL is internally pulled low through a 1MΩ resistor. When the USBSEL pin is connected to a logic high level, the USBH level will be active. Conversely, when USBSEL is pulled to a logic low level (ground), the USBL level will be used for charging. Typically, USBH is set for 500mA and USBL is set for 100mA. However, these two USB charge levels may be user programmed to any level between 50mA and 500mA by selecting the appropriate resistor values for RSETH and RSETL. Refer to Table 1 for recommended RSETH and RSETL values for the desired USB input constant current charge levels. USB Charge Reduction In many instances, product system designers do not know the real properties of a potential USB port used to supply power to the battery charger. Typically, powered USB ports found on desktop and notebook PCs should supply up to 500mA. In the event a USB port being used to supply the charger is unable to provide the programmed fast charge current or if the system under charge must also share supply current with other functions, the AAT3686 will automatically reduce USB fast charge current to maintain port integrity and protect the host system. 13 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger ICC ADP Ω) RSET (kΩ USBH Ω) RSET (kΩ USBL Ω) RSET (kΩ 50 75 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 N/A N/A 84.5 43.2 28.0 21.0 16.9 13.3 11.5 10.2 9.09 8.06 7.32 6.65 6.04 5.62 5.36 86.6 57.6 42.2 21.0 13.7 10.2 8.06 6.65 5.62 4.87 4.32 3.83 3.48 3.16 2.87 2.67 2.43 86.6 57.6 42.2 20.5 13.7 10.2 8.06 6.65 5.62 4.87 4.32 3.83 3.48 3.16 2.87 2.67 2.43 USB VUSB R11 1.025M CHR R12 VCHR = 2.0V 825k Figure 2: Internal Equivalent Circuit for the CHR Pin. Table 1: Resistor Values. The USB charge reduction system becomes active when the voltage on the USB input falls below the USB charge reduction threshold (VUSBCHR), which is typically 4.5V. Regardless of which USB charge function is selected (USBH or USBL), the charge reduction system will reduce the fast charge current level in a linear fashion until the voltage sensed on the USB input recovers above the charge reduction threshold voltage. The USB charge reduction threshold (VUSBCHR) can be externally set to a value lower than 4.5V by placing a resistor divider network between VUSB and ground with the center connected to the CHR pin. The USB charge reduction feature can be disabled by connecting a 10kΩ resistor from the CHR pin directly to the USB input pin (see Figure 2). The following equation can be used to approximate a USB charge reduction threshold below 4.5V: VUSBCHR = 2.0V ÷ R12 R12 + R11 USB Input Charge Inhibit and Resume The AAT3686 UVLO and power on reset feature will function when the USB input pin voltage level drops below the UVLO threshold. At this point, the charger will suspend charging and shut down. When power is re-applied to the USB 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 AAT3686 provides an enable function to control the charger IC on and off. The enable (EN) pin is active high. When pulled to a logic low level, the AAT3686 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. Where R11/R12 << 1MΩ. 14 3686.2006.10.1.9 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Programming Charge Current Protection Circuitry The fast charge constant current charge level for both adapter and USB input modes are programmed with set resistors placed between the ADPSET, USBH, and USBL pins 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, 1% tolerance metal film resistors are recommended for the set resistor function. Fast charge constant current levels from 50mA to 1.5A can be set by selecting the appropriate resistor value from Table 1. The RSET resistor should be connected between the ADPSET pin and ground. The USB input fast charge constant current charge control provides for two current set levels, USBH and USBL. The USBSEL pin is used to select the high or low charge current levels in the USB charge mode. When the USBSEL pin is pulled to a voltage level above the VUSBSEL(H) threshold, the USBH current level will be selected. Conversely, this pin should be pulled below VUSBSEL(L) to enable the USBL charge level. Typically, the two RSETH and RSETL resistors for the USBH and USBL functions are fixed for 500mA and 100mA USB fast charge levels. However, these two charge levels can be set to any level between 50mA and 500mA depending upon the system design requirements for a given USB charge application. Refer to Table 1 and Figure 3 for recommended RSETH and RSETL values. IFASTCHARGE (mA) 10000 1000 ADP USBL 100 10 USBH 1 10 RSET (kΩ) Figure 3: IFASTCHARGE vs. RSET. 3686.2006.10.1.9 100 Programmable Watchdog Timer The AAT3686 contains a watchdog timing circuit for the adapter input charging mode. No watchdog timing functions are active for the USB input mode. Typically, a 0.1µF ceramic capacitor is connected between the TC pin and ground. When a 0.1µF ceramic capacitor is used, the device will time a shutdown condition if the trickle charge mode exceeds 25 minutes and a combined trickle charge plus fast charge mode of three hours. When the device transitions to the constant voltage mode, the timing counter is reset and will time out after three hours and shut down the charger (see Table 2). Mode Trickle Charge (TC) Time Out Trickle Charge (TC) + Fast Charge (CC) Time Out Constant Voltage (VC) Mode Time Out Time 25 minutes 3 hours 3 hours Table 2: Summary for a 0.1µF Used for the Timing Capacitor. The CT pin is driven by a constant current source and will provide a linear response to increases in the timing capacitor value. Thus, if the timing capacitor were to be doubled from the nominal 0.1µF value, the time-out times would be doubled. If the programmable watchdog timer function is not needed, it can be disabled by connecting the CT pin to ground. The CT pin should not be left floating or un-terminated, as this will cause errors in the internal timing control circuit. The constant current provided to charge the timing capacitor is very small, and this pin is susceptible to noise and changes in capacitance value. Therefore, the timing capacitor should be physically located on the printed circuit board layout as closely as possible to the CT pin. Since the accuracy of the internal timer is dominated by the capacitance value, 10% tolerance or better ceramic capacitors are recommended. Ceramic capacitor materials, such as X7R and X5R type, are a good choice for this application. 15 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger 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 overvoltage protection threshold (VOVP). If an over-voltage condition occurs, the AAT3686 charge control will shut down the device until voltage on the BAT pin drops below the over-voltage protection threshold (VOVP). The AAT3686 will resume normal charging operation after the over-voltage condition is removed. During an over-voltage event, the STAT LEDs will report a system fault, and the actual fault condition may be read via the DATA pin signal. Over-Temperature Shutdown The AAT3686 has a thermal protection control circuit which will shut down charging functions should the internal die temperature exceed the preset thermal limit threshold. Battery Temperature Fault Monitoring In the event of a battery over-temperature condition, the charge control will turn off the internal pass device and report a battery temperature fault on the DATA pin function. The STAT LEDs will also display a system fault. After the system recovers from a temperature fault, the device will resume charging operation. The AAT3686 checks battery temperature before starting the charge cycle, as well as during all stages of charging. This is accomplished by monitoring the voltage at the TS pin. This system is intended to use negative temperature coefficient thermistors (NTC), which are typically integrated into the battery package. Most of the commonly used NTC thermistors in battery packs are approximately 10kΩ at room temperature (25°C). The TS pin has been specifically designed to source 80µA of current to the thermistor. The voltage on the TS pin that results from the resistive load should stay within a window from 335mV to 2.32V. If the battery becomes too hot during charging due to an internal fault, the thermistor will heat up and reduce in value, pulling the TS pin voltage 16 lower than the TS1 threshold and the AAT3686 will signal the fault condition. 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 AAT3686-1, the TS pin may be left open. Battery Charge Status Indication The AAT3686 indicates the status of the battery under charge with two different systems. First, the device has two status LED driver outputs. These two LEDs can indicate simple functions such as no battery charge activity, battery charging, charge complete, and charge fault. The AAT3686 also provides a bi-directional data reporting function so that a system microcontroller can interrogate the DATA pin and read any one of 22 system states. Status Indicator Display Simple system charging status states can be displayed using one or two LEDs in conjunction with the STAT1 and STAT2 pins on the AAT3686. These two pins are simple switches to connect the LED cathodes to ground. It is not necessary to use both display LEDs if a user simply wants to have a single lamp to show "charging" or "not charging." This can be accomplished by using the STAT1 pin and a single LED. Using two LEDs and both STAT pins simply gives the user more information to the charging states. Refer to Table 3 for LED display definitions. The LED anodes should be connected to either VUSB or VADP, depending upon system design requirements. The LEDs should be biased with as little current as necessary to create reasonable illumination; therefore, a ballast resistor should be placed between the LED cathodes and the STAT1/2 pins. LED current consumption will add to the overall thermal power budget for the device package, so it is wise to keep the LED drive current to a minimum. 2mA should be sufficient to drive most low-cost green or red LEDs. It is not recommended to exceed 8mA for driving an individual status LED. 3686.2006.10.1.9 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Event Description Charge Disabled or Low Supply Charge Enabled Without Battery Battery Charging Charge Completed Fault STAT1 STAT2 Off Flash1 On Off On Off Flash1 Off On On Table 3: Status LED Display Conditions. The required ballast resistor value can be estimated using the following formulas: For connection to the adapter supply: RB(STAT1/2) = VADP - VF(LED) ILED(STAT1/2) Example: RB(STAT1) = 5.5V - 2.0V = 1.75kΩ 2mA Note: Red LED forward voltage (VF) is typically 2.0V @ 2mA. For connection to the USB supply: RB(STAT1/2) = VUSB - VF(LED) ILED(STAT1/2) Example: RB(STAT2) = 5.0V - 3.2V = 900Ω 2mA Note: Green LED forward voltage (VF) is typically 3.2V @ 2mA. The four status LED display conditions are described in Table 3. Digital Charge Status Reporting The AAT3686 has a comprehensive digital data reporting system by use of the DATA pin feature. This function can provide detailed information regarding the status of the charging system. The DATA pin is a bi-directional port which will read back a series of data pulses when the system microcontroller asserts a request pulse. This single strobe request protocol will invoke one of 22 possible return pulse counts which the microcontroller can look up based on the serial report table shown in Table 4. The DATA pin function is active low and should normally be pulled high to VADP or VUSB. This data line may also be pulled high to the same level as the high state for the logic I/O port on the system microcontroller. In order for the DATA pin control circuit to generate clean, sharp edges for the data output and to maintain the integrity of the data timing for the system, the pull-up resistor on the data line should be low enough in value so that the DATA signal returns to the high state without delay. If too small a pull-up resistor is used, the strobe pulse from the system microcontroller could exceed the maximum pulse time and the DATA output control could issue false status reports. A 1.5kΩ resistor is recommended when pulling the DATA pin high to 5.0V on either VADP or VUSB inputs. If the data line is pulled high to a voltage level less than 5.0V, the pull-up resistor can be calculated based on a recommended minimum pull-up current of 3mA. Use the following formula: RPULL-UP ≤ VPULL-UP 3mA 1. Flashing rate depends on output capacitance. 3686.2006.10.1.9 17 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 DATA Report Status Chip Over-Temperature Shutdown Battery Temperature Fault Over-Voltage Turn Off Not Used ADP Watchdog Time-Out in Battery Condition Mode ADP Battery Condition Mode ADP Watchdog Time-Out in Constant Current Mode ADP Thermal Loop Regulation in Constant Current Mode ADP Constant Current Mode ADP Watchdog Time-Out in Constant Voltage Mode ADP Constant Voltage Mode ADP End of Charging USBH Battery Condition Mode USBH Charge Reduction in Constant Current Mode USBH Constant Current Mode USBH Constant Voltage Mode USBH End of Charging USBL Battery Condition Mode USBL Charge End of Charging Reduction in Constant Current Mode USBL Constant Current Mode USBL Constant Voltage Mode USBL End of Charging Data Report Error Table 4: Serial Data Report Table. 1.8V to 5.0V IN AAT3686 Status Control RPULL_UP IN DATA Pin GPIO OUT OUT μP GPIO Port Figure 4: Data Pin Application Circuit. Data Timing The system microcontroller should assert an active low data request pulse for minimum duration of 200ns; this is specified by the SQPULSE. Upon sensing the rising edge of the end of the data request 18 pulse, the AAT3686 status data control will reply the data word back to the system microcontroller after a delay defined by the data report time specification TDATA(RPT). The period of the following group of data pulses will be defined by the TDATA specification. 3686.2006.10.1.9 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Timing Diagram SQ SQPULSE PDATA System Reset System Start CK TSYNC Data TLAT TDATA(RPT) = TSYNC + TLAT < 2.5 PDATA TOFF > 2 PDATA TOFF N=1 N=2 N=3 Thermal Considerations VBAT = Battery voltage as seen at the BAT pin The AAT3686 is offered in a 3x4mm TDFN package and a 4x4mm TDFN package, each of which can provide up to 2.7W of power dissipation when it is properly bonded to a printed circuit board and has a maximum thermal resistance of 37°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: ICC = Maximum constant fast charge current programmed for the application IOP = Quiescent current consumed by the charger IC for normal operation First, the maximum power dissipation for a given situation should be calculated: Eq. 1: PD = [(VIN - VBAT) · ICC + (VIN · IOP)] Where: PD = Total power dissipation by the device VIN = Either VADP or VUSB, depending on which mode is selected 3686.2006.10.1.9 Next, the maximum operating ambient temperature for a given application can be estimated based on the thermal resistance of the 3x4mm and 4x4mm TDFN packages when sufficiently mounted to a PCB layout and the internal thermal loop temperature threshold. Eq. 2: TA = TJ - (θJA · PD) Where: TA = Ambient temperature in degrees C TJ = Maximum device junction temperature below the thermal loop threshold PD = Total power dissipation by the device θJA = Package thermal resistance in °C/W 19 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Example: For an application where the fast charge current for the adapter mode is set to 1A, VADP = 5.0V, and the worst case battery voltage is 3.0V, what is the maximum ambient temperature where the thermal limiting will become active? Given: VADP = 5.0V VBAT = 3.0V ICC = 1A IOP = 0.75mA TJ = 110°C θJA = 37°C/W Using Equation 3, calculate the device power dissipation for the stated condition: Eq. 3: PD = (5.0V - 3.0V)(1A) + (5.0V · 0.75mA) = 2.00375W The maximum ambient temperature before the AAT3686 thermal loop becomes active can now be calculated using Equation 4: Eq. 4: TA = 110°C - (37°C/W · 2.00375W) = 35.86°C = 35.86°C Therefore, under the stated conditions for this worst case power dissipation example, the AAT3686 will enter the thermal loop and lower the fast charge constant current when the ambient operating temperature rises above 35.86°C. Capacitor Selection 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 AAT3686 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 bounce effects when the power supply is "hot plugged." Likewise, a 10µF or greater input capacitor is recommended for the USB input to help buffer the effects of USB source power switching, noise, and input cable impedance. Output Capacitor The AAT3686 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 AAT3686 is to be used in applications where the battery can be removed from the charger, such as in the case of 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 to the AAT3686 BAT pin as possible. To minimize voltage drops on the PCB, keep the high current carrying traces adequately wide. For maximum power dissipation of the AAT3686 TDFN packages, the metal substrate should be solder bonded to the board. It is also recommended to maximize the substrate contact to the PCB ground plane layer to further increase local heat dissipation. Refer to the AAT3686 evaluation board for a good layout example. Input Capacitor In general, it is good design practice to place a decoupling capacitor between the VADP and VUSB pins and ground. An input capacitor in the range of 20 3686.2006.10.1.9 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger AAT3686 Evaluation Board Schematic Diagram Figure 5: AAT3686 Evaluation Board Component Side Layout. Figure 6: AAT3686 Evaluation Board Solder Side Layout. ON/OFF Figure 7: AAT3686 Evaluation Board Assembly Layout. USBSEL J1 J2 3 2 1 3 2 1 HI LO D4 (b) USB BAV74LT1 D4 (a) ADP D3 BAV74LT1 RED LED R9 R7 R8 R10 1.5K 1.5K 1.5K 1.5K R6 R11 Open Open U1 3 ADP BAT EN STAT2 CHR USBH 5 7 C2 C3 10μF 10μF 10μF R12 R1 Open 10K USBSEL USB 6 C1 AAT3686 1 2 BAT GREEN RED LED LED D2 D1 8 STAT1 DATA ADPP# TS GND 4 USBL ADPSET 13 10 11 DATA 9 15 SW1 14 16 R3 CT R5 R4 C6 8.06K 42.2K 8.06K Open (Optional) 12 C5 0.1μF TS CT Figure 8: AAT3686 Evaluation Board Schematic Diagram. 3686.2006.10.1.9 21 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger AAT3686 Evaluation Board Bill of Materials (BOM) Quantity Description 2 2 1 1 3 1 2 1 1 2 1 1 1 4 1 1 22 Desig. Footprint Test Pin TS, CT Conn Term Block USB, GND/ TBLOK2 2.54mm 2POS ADP, GND Conn Term Block BAT, TS, TBLOK3 2.54mm 3POS GND USB 2.0 Receptacle, USB USB-MINI-B 5POS Capacitor, Ceramic, C1, 2, 3 0805 10µF 6.3V 10% X5R 0805 Capacitor, Ceramic, C5 0603 0.1µF 25V 10% X5R 0603 Typical Red LED D1, D3 1206LED Typical Green LED D2 1206LED Switching Diode D4 a, b SOT23-3 Header, 3-Pin J1, 2 Header 2mm-3 RES 10kΩ 1/16W R1 0603 5% 0603 SMD RES 8.06kΩ 1/16W R3, 4 0603 1% 0603 SMD RES 42.2kΩ 1/16W R5 0603 1% 0603 SMD RES 1.5kΩ 1/16W R7, 8, 0603 5% 0603 SMD 9, 10 Switch Tact 6mm SW1 Switch SPST H = 5.0mm AAT3686 USB Port/AC U1 TDFN34-16; Adapter Lithium-Ion/ TDFN44-16 Polymer Battery Charger Manufacturer Part # Mill-Max Phoenix Contact 6821-0-0001-00-00-08-0 277-1274-ND Phoenix Contact 277-1273-ND Hirose Electronic Co., Ltd. Murata H2959CT-ND 490-1717-1-ND Murata 478-1244-2-ND Chicago Miniature Lamp Chicago Miniature Lamp On Semi Sullins Panasonic/ECG CMD15-21SRC/TR8 CMD15-21SRC/TR8 BAV74LT1 6821-0-0001-00-00-08-0 P10KJTR-ND Panasonic/ECG P9.76KHCT-ND Panasonic/ECG P42.2KHTR-ND Panasonic/ECG P1.5KCGCT-ND ITT Industries/C&K Div CKN9012-ND AnalogicTech AAT3686IRN-4.2 AAT3686IXN-4.2 3686.2006.10.1.9 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger Ordering Information Package Marking1 Part Number (Tape and Reel)2 TDFN34-16 TDFN44-16 TDFN44-16 PHXYY PHXYY SKXYY AAT3686IRN-4.2-T1 AAT3686IXN-4.2-T1 AAT3686IXN-4.2-1-T1 All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/pbfree. Package Information TDFN34-16 Detail "B" 4.00 ± 0.05 Index Area (D/2 x E/2) 0.20 MIN 0.35 ± 0.10 0.075 ± 0.075 Detail "A" Top View Bottom View 0.21 ± 0.05 3.00 ± 0.05 Pin 1 Indicator (optional) 0.85 MAX 7.5° ± 7.5° Detail "B" 0.05± 0.05 0.229 ± 0.051 Side View Option A: C0.30 (4x) max Chamfered corner Option B: R0.30 (4x) max Round corner Detail "A" All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3686.2006.10.1.9 23 AAT3686 USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger TDFN44-16 3.30 ± 0.05 Detail "B" 4.00 ± 0.05 Index Area (D/2 x E/2) 0.3 ± 0.10 0.375 ± 0.125 0.16 0.075 ± 0.075 0.1 REF 4.00 ± 0.05 2.60 ± 0.05 Top View Pin 1 Indicator (optional) 0.23 ± 0.05 Bottom View 0.45 ± 0.05 Detail "A" 0.229 ± 0.051 + 0.05 0.8 -0.20 7.5° ± 7.5° 0.05 ± 0.05 Detail "B" Option A: C0.30 (4x) max Chamfered corner Option B: R0.30 (4x) max Round corner Side View Detail "A" All dimensions in millimeters. © Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. 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