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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger General Description
The AAT3689 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 a minimum number of external components. The AAT3689 precisely regulates battery charge voltage and current for 4.2V lithium-ion/polymer battery cells. Adapter charge current rates may be programmed up to 1.0A. In the absence of an adapter and with a USB port connected, the battery can also be charged by USB power. The USB charge current can be programmed up to 500mA. 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. The AAT3689 is available in a Pb-free, thermallyenhanced, space-saving 12-pin 3x3mm TDFN package and is rated over the -40C to +85C temperature range.
AAT3689
Features
* * * *
BatteryManagerTM
* * * * * * * *
USB/AC Adapter System Power Charger -- USB: Programmable up to 500mA -- Adapter: Programmable up to 1.0A 4.0V to 5.5V Input Voltage Range Adapter Presence Automatically Disables USB Charging High Level of Integration With Internal: -- Charging Devices -- Reverse Blocking Diodes -- Current Sensing Automatic Recharge Sequencing Battery Temperature Monitoring Full Battery Charge Auto Turn-Off Over-Current Protection Over-Voltage Protection Emergency Thermal Protection Power On Reset and Soft Start 12-Pin 3x3 TDFN Package
Applications
* * * * * * Cellular Telephones Digital Still Cameras Hand-Held PCs MP3 Players Personal Data Assistants (PDAs) Other Lithium-Ion/Polymer Battery-Powered Devices
Typical Application
Enable
EN
USB Input
USB USBSET RSETUSB
BATT+
BAT TS C2 10F
AAT3689
ADP Input
RSETADP ADP ADPSET STAT1
BATTCT CT
GND
TEMP
STAT2
Battery Pack
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger Pin Descriptions
Pin #
1, 10 2 3 4 5 6 7 8 9
AAT3689
Name
USB BAT ADP GND EN TS STAT2 STAT1 CT
Type
In In/Out In Ground In In/Out Out Out In/Out
Function
USB power supply input. Battery charging and sensing. Adapter power supply input. Ground connection. Enable pin. Logic high enables the IC. Connect to 10k NTC thermistor. 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. Connect a resistor between this pin and GND to set the USB charging current. Connect a resistor between this pin and GND to set the adapter charging current. Exposed paddle (bottom); connect to GND directly beneath package.
11 12 EP
USBSET ADPSET
In/Out In/Out
Pin Configuration
TDFN33-12 (Top View)
USB BAT ADP GND EN TS
1 2 3 4 5 6
12 11 10 9 8 7
ADPSET USBSET USB CT STAT1 STAT2
2
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger Absolute Maximum Ratings1
Symbol
VP VP VN TJ TLEAD
AAT3689
Description
USB, ADP, <30ms, Duty Cycle <10% USB, ADP Continuous BAT, USBSET, ADPSET, STAT1, STAT2, TS, CT, EN Operating Junction Temperature Range Maximum Soldering Temperature (at leads)
Value
-0.3 to 7.0 -0.3 to 6.0 -0.3 to VP + 0.3 -40 to 150 300
Units
V V V C C
Thermal Information2
Symbol
JA PD
Description
Maximum Thermal Resistance Maximum Power Dissipation
Value
50 2.0
Units
C/W W
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. 3689.2006.11.1.0
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger Electrical Characteristics1
VADP = 5V, TA = -25C to +85C, unless otherwise noted. Typical values are TA = 25C. Symbol
Operation VUSB, VADP VU_DSBL VUVLO IOP ISLEEP ILeakage USB Port or Adapter Voltage Range ADP Voltage Level to Disable USB Charging Under-Voltage Lockout Under-Voltage Lockout Hysteresis Operating Current Sleep Mode Current 4.0 4.25 Rising Edge CC Charge Current = 500mA VADP = 5V, USB = EN = GND VUSB = 5V, ADP = EN = GND VBAT = 4V, USB, ADP Pins Open 4.158 2.8 4.5 3.0 150 0.75 0.3 1.0 4.2 0.5 3.0 VBAT_EOC - 0.1 100 10 In CC Mode In CC Mode 2.0 2.0 4000 2000 0.2 0.4 0.25 0.5 0.35 0.65 1000 4.242 3.15 5.5 4.7 V V V mV mA A A V % V V mA % V V
AAT3689
Description
Conditions
Min
Typ
Max Units
1.5 1 12
Reverse Leakage Current from BAT Pin Voltage Regulation VBAT_EOC1 End of Charge Voltage Accuracy VBAT/VBAT EOC Voltage Tolerance VMIN Preconditioning Voltage Threshold Battery Recharge Voltage VRCH Threshold Current Regulation ICH Charge Current Charge Current Regulation ICH/ICH Tolerance VADPSET ADPSET Pin Voltage VUSBSET USBSET Pin Voltage KIADP Current Set Factor: ICHARGE/IADPSET KIUSB Current Set Factor: ICHARGE/IUSBSET Charging Devices Adapter Charging Transistor RDS(ON)A On Resistance USB Charging Transistor RDS(ON)U On Resistance
VIN = 5.5V VIN = 5.5V

1. The AAT3689 output charge voltage is specified over the 0 to 70C ambient temperature range; operation over the -25C to +85C temperature range is guaranteed by design.
4
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger Electrical Characteristics1
VADP = 5V, TA = -25C to +85C, unless otherwise noted. Typical values are TA = 25C. Symbol Description Conditions Min Typ Max
1.6 2.2 VEN = 5V CCT = 100nF, VADP = 5.5V CCT = 100nF, VADP = 5.5V CCT = 100nF, VADP = 5.5V STAT Pin Sinks 4mA 8.0 4.4 10 105 7.5 80 330 15 2.3 10 145 0.4 10 25 3.0 3.0 0.4
AAT3689
Units
V V A Minute Hour Hour V mA V % %ICHG_CC % A mV V mV C
Logic Control / Protection Input High Threshold (Adapter) VEN(H) Input High Threshold (USB) VEN(L) Input Low Threshold IEN(H) EN Input Current 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/ICH Pre-Charge Current IOCP Over-Current Protection Threshold ITERM/ICHG Charge Termination Threshold Current ITS Current Source from TS Pin TS1 TS2 TOVSD TS Hot Temperature Fault TS Cold Temperature Fault Over-Temperature Shutdown Threshold
Threshold Hysteresis Threshold Hysteresis
70 310 2.2
90 350 2.4
1. The AAT3689 output charge voltage is specified over the 0 to 70C ambient temperature range; operation over the -25C to +85C temperature range is guaranteed by design. 3689.2006.11.1.0
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics
IFASTCHARGE vs. RSET
10000
AAT3689
Battery Voltage vs. Supply Voltage
4.242
IFASTCHARGE (mA)
4.221
1000
VBAT (V)
USB
4.200
ADP
100
ADP
4.179
USB
10 1 10 100 1000
4.158 4.5
4.75
5.0
5.25
5.5
RSET (k)
Supply Voltage (V)
Battery Recharge Voltage Threshold vs. Temperature
4.140 4.130 4.120
End of Charge Voltage vs. Temperature
4.242
VRCH (V)
4.100 4.090 4.080 4.070 4.060 4.050 4.040 -50
ADP USB
VBAT_EOC (V)
4.110
4.221
ADP
4.200
4.179
USB
-25
0
25
50
75
100
4.158 -50
-25
0
25
50
75
100
Temperature (C)
Temperature (C)
Preconditioning Voltage Threshold vs. Temperature
3.05 3.04 3.03 3.02
Preconditioning Charge Current vs. Temperature
(RSETADP = 8.06k; RSETUSB = 8.06k)
120 60
VMIN (V)
3.01 3.00 2.99 2.98 2.97 2.96 2.95 -50
USB
ICH ADP (mA)
110
55
ICH USB (mA)
ADP
100 50
ADP
USB
90 45
80 -25 0 25 50 75 100 -50 -25 0 25 50 75
40 100
Temperature (C)
Temperature (C)
6
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics
Fast Charge Current vs. Temperature
(RSETADP = 8.06k; RSETUSB = 8.06k)
1100 1080 1060 540 530
AAT3689
Adapter Charging Current vs. Battery Voltage
(RSETADP = 8.06k)
1.2 1.0
ICH ADP (mA)
1040 1020 1000 980 960 940 920 900 -50 -25 0 25
USB
520
ICH USB (mA)
510 500 490 480
0.8
ICH (A)
0.6 0.4 0.2 0.0 2.5 2.9 3.3 3.7 4.1 4.5
ADP
470 460 450 50 75 440 100
Temperature (C)
Battery Voltage (V)
USB Charging Current vs. Battery Voltage
(RSETUSB = 8.06k)
600 500 400 300 200 100 0 2.5
Fast Charge Current vs. Adapter Supply Voltage
(RSETADP = 8.06k)
1200
VBAT = 3.3V
1000 800 600 400 200 0 3.0 3.5 4.0 4.5 4.0 4.5 5.0 5.5 6.0
ICH (mA)
ICH (mA)
VBAT = 3.9V VBAT = 3.5V
Battery Voltage (V)
Adapter Supply Voltage (V)
Fast Charge Current vs. USB Supply Voltage
(RSETUSB = 8.06k)
600
Fast Charge Current vs. USB Supply Voltage
(RSETUSB = 42.4k)
120
VBAT = 3.3V
500 100
VBAT = 3.5V VBAT = 3.9V
80
VBAT = 3.5V
ICH (mA)
ICH (mA)
400 300 200 100 0 4.0
VBAT = 3.3V VBAT = 3.9V
60 40 20 0
4.25
4.5
4.75
5.0
5.25
5.5
5.75
6.0
4.0
4.5
5.0
5.5
6.0
6.5
USB Supply Voltage (V)
USB Supply Voltage (V)
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics
Fast Charge Current vs. USB Supply Voltage
(RSETUSB = 8.06k)
600 1.4
AAT3689
VIH vs. Supply Voltage
EN Pin (Rising)
1.3 1.2
0C
500 400
ICH (mA)
70C 25C
VIH (V)
1.1 1.0 0.9 0.8 0.7 0.6 0.5
-40C
+25C
300 200 100 0 4.4
+85C
0.4 4.5 4.6 4.7 4.8 4.9 5.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
USB Supply Voltage (V)
Supply Voltage (V)
VIL vs. Supply Voltage
EN Pin (Falling)
1.4 1.3 1.2 1.1 0.80 0.70 0.60
Adapter Mode Supply Current vs. ADPSET Resistor
-40C
+25C
VIH (V)
1.0 0.9 0.8 0.7 0.6 0.5 0.4 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
IQ (mA)
0.50 0.40 0.30 0.20
Constant Current
Pre-Conditioning
+85C
0.10 0.00 1 10 100 1000
Supply Voltage (V)
ADPSET Resistor (k)
Counter Timeout vs. Temperature
(CT = 0.1F)
10
CT Pin Capacitance vs. Counter Timeout
2.0 1.8
Counter Timeout (%)
8
Capacitance (F)
6 4 2 0 -2 -4 -6 -8 -10 -50 -25 0 25 50 75 100
1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 2
Precondition Timeout
Precondition + Constant Current Timeout or Constant Voltage Timeout
4
6
8
10
Temperature (C)
Time (hours)
8
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger Typical Characteristics
Temperature Sense Output Current vs. Temperature
88
AAT3689
TS Pin Current (A)
86 84 82 80 78 76 74 72 -50 -25 0 25 50 75 100
Temperature (C)
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger Functional Block Diagram
Reverse Blocking
AAT3689
USB USBSET
Current Compare CV/ Precharge
Constant Current
Charge Control
UVLO
BAT
ADPSET ADP
Current Compare
OverTemperature Protection
Reverse Blocking
Voltage Sense
Window Comparator
80uA
TS
Charge Status
STAT1 STAT2
IC Enable
Watchdog Timer
CT
EN GND
Functional Description
The AAT3689 is a highly integrated single cell lithium-ion/polymer battery charger IC designed to operate with USB port and AC adapter inputs, while requiring a minimum number of external components. The AAT3689 precisely regulates battery charge voltage and current for 4.2V lithiumion/polymer battery cells. The adapter charge input constant current level may be programmed up to 1.0A for rapid charging applications. In the absence of a high current adapter input source, the AAT3689 may be powered from a USB port VBUS supply. The USB constant charge current can be externally programmed for maximum constant current charge levels up to 500mA. The USB charge function is automatically disabled when an adapter input power source greater than 4.5V is present.
Status monitor output pins are provided to indicate the battery charge status by directly driving two external LEDs. 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 AAT3689 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.
Charging Operation
Regardless of which charge input function is selected (i.e., either the adapter input or USB input), the AAT3689 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).
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger
Preconditioning Trickle Charge Phase Charge Complete Voltage Regulated Current I = Max CC
AAT3689
Constant Current Charge Phase
Constant Voltage Charge Phase
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 AAT3689 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 AAT3689 checks the state of the battery. If the cell voltage is below the Preconditioning Voltage Threshold (VMIN), the AAT3689 begins preconditioning the cell. The battery preconditioning trickle charge current is equal to the fast charge constant current divided by 10. 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.
charge mode until the battery reaches the voltage regulation point, VBAT_EOC.
Constant Voltage Charging
The system transitions to a constant voltage charging mode when the battery voltage reaches output charge regulation threshold (VBAT_EOC) during the constant current fast charge phase. The regulation voltage level is factory programmed to 4.2V (1%). The 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% 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). 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 0.3A in sleep mode, the AAT3689 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 AAT3689 input voltage drops, the device will enter the sleep mode and automatically resume charging once the input supply has recovered from its fault condition. 11
Fast Charge / Constant Current Charging
The cell preconditioning continues until the voltage on the BAT pin exceeds the Preconditioning Voltage Threshold (VMIN). At this point, the AAT3689 begins the constant-current fast charging phase. The fast charge Constant Current (ICC) amplitude is determined by the charge mode, ADP or USB, and is programmed by the user via the RSETADP and RSETUSB resistors. The AAT3689 remains in constant current
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger
System Operation Flow Chart
AAT3689
ADP Power Select
Yes
UVLO VP > VUVLO No
Yes
Switch On No
USB No ADP Loop Power On Reset
Sleep Mode
Enable
USB Loop Timing Fault Conditions Monitor OV, OT No Yes Battery Temp. Monitor VTS1 < TS < VTS2 No
Yes Expire
Shutdown Mode Battery Temp. Fault
Charge Safety Timer No Recharge Test VRCH > VBAT Yes Preconditioning Test VMIN > VBAT Yes Low Current Conditioning Charge Set
No Yes Current Charging Mode
Current Phase Test VEOC > VBAT
No Yes Voltage Charging Mode
Voltage Phase Test IBAT > ITERM No Charge Charge Completed Completed
12
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0.5A/1.0A USB Port/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 1.0A may be programmed by the user. The AAT3689 system control will always select the adapter input over the USB supply input whenever adapter voltage is present on the ADP pin. The AAT3689 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 RSETADP resistor connected between the ADPSET pin and ground. Refer to Table 1 for recommended RSETADP values for a desired constant current charge level. The precise charging function in the adapter mode may be read from the status LEDs. Please refer to the Battery Charge Status Indication discussion in this datasheet for further details. Adapter Input Charge Inhibit and Resume The AAT3689 has an under-voltage lockout and power on reset feature so that if the input supply to the adapter pin drops below the UVLO threshold the charger will suspend charging and shut down. When power is re-applied to the adapter pin or the UVLO condition recovers and VADP > 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. ICC
50 75 100 200 300 400 500 600 700 800 900 1000
AAT3689
ADP RSET (k)
N/A N/A 84.5 43.2 28.0 21.0 16.9 13.3 11.5 10.2 9.09 8.06
USB RSET (k)
86.6 57.6 42.2 21.0 13.7 10.2 8.06 N/A N/A N/A N/A N/A
Table 1: Resistor Values. USB Input Charge Inhibit and Resume The AAT3689 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 AAT3689 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 AAT3689 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.
USB Mode
The AAT3689 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 may be user programmed to any level between 50mA and 500mA by selecting the appropriate resistor values for RSETUSB. Refer to Table 1 for recommended RSETUSB values for the desired USB input constant current charge levels.
Programming Charge Current
The fast charge constant current charge level for both Adapter and USB input modes are programmed with set resistors placed between the ADPSET and USBSET pins and ground. The accuracy of the fast charge is dominated by the tolerance of the set resistor used. For this reason, 1% 13
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger
tolerance metal film resistors are recommended for the set resistor function. ADP fast charge constant current levels from 100mA to 1.0A may be set by selecting the appropriate resistor value from Table 1. The USB charge may 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 2 for recommended RSETUSB values.
10000
AAT3689
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 0.1F value, the time-out times would be doubled. If the programmable watchdog timer function is not needed, it may 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.
IFASTCHARGE (mA)
1000
ADP
100
USB
10 1 10 100 1000
RSET (k)
Figure 2: IFASTCHARGE vs. RSET.
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 AAT3689 charge control will shut down the device until voltage on the BAT pin drops below the over-voltage protection threshold (VOVP). The AAT3689 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.
Protection Circuitry
Programmable Watchdog Timer The AAT3689 contains a watchdog timing circuit for the adapter input charging mode. No watchdog timing functions are active for the USB input mode. Typically, a 0.1F ceramic capacitor is connected between the CT pin and ground. When a 0.1F ceramic capacitor is used, the device will time a shutdown condition if the trickle charge mode exceeds 25 minutes or the combined trickle charge plus fast charge mode exceeds 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. Mode
Trickle Charge (TC) Time Out Trickle Charge (TC) + Fast Charge (CC) Time Out Constant Voltage (VC) Mode Time Out
Over-Temperature Shutdown
The AAT3689 has a thermal protection control circuit which will shut down charging functions should the internal die temperature exceed the preset thermal limit threshold.
Time
25 minutes 3 hours 3 hours
Battery Temperature Fault Monitoring
In the event of a battery over-temperature condition, the charge control will turn off the internal pass device. The STAT LEDs will display a system fault. After the system recovers from a temperature fault, the device will resume charging operation.
Table 2: Summary for a 0.1F Used for the Timing Capacitor. 14
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger
The AAT3689 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 (NTC) thermistors, which are typically integrated into the battery package. Most commonly used NTC thermistors used in battery packs are approximately 10k at room temperature (25C). The TS pin has been specifically designed to source 80A of current to the thermistor. The voltage on the TS pin that results from the resistive load should stay within a window from 330mV to 2.30V. If the battery becomes too hot during charging due to an internal fault, the thermistor will heat up and reduce in value, thus pulling the TS pin voltage lower than the TS1 threshold and the AAT3689 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 10k resistor. 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. 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)
AAT3689
Example:
RB(STAT1) =
5.5V - 2.0V = 1.75k 2mA
Battery Charge Status Indication
The AAT3689 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. Status Indicator Display Simple system charging status may be displayed using one or two LEDs in conjunction with the STAT1 and STAT2 pins on the AAT3689. 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 the system design
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 = 900 2mA
Note: Green LED forward voltage (VF) is typically 3.2V @ 2mA. The status LED display conditions are described in Table 3.
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger
AAT3689
Event Description
Charge Disabled or Low Supply Charge Enabled Without Battery Battery Charging Charge Completed Fault
STAT1
Off Flash1 On Off On
STAT2
Off Flash1 Off On On
Table 3: Status LED Display Conditions.
Capacitor Selection
Input Capacitor In general, it is good design practice to place a decoupling capacitor between the ADP and USB pins and ground. An input capacitor in the range of 1F to 22F 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 AAT3689 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 10F 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 10F 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 AAT3689 only requires a 1F ceramic capacitor on the BAT pin to maintain circuit stability. This value should be increased to 10F or more if the battery connection is made any distance from the charger output. If the AAT3689 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 10F 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 AAT3689 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 AAT3689 TDFN package, 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.
1. Flashing rate depends on output capacitance.
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger
AAT3689 Evaluation Board Layout
AAT3689
Figure 5: AAT3689 Evaluation Board Component Side Layout.
Figure 6: AAT3689 Evaluation Board Solder Side Layout.
AAT3689 Evaluation Board Schematic Diagram
ON/OFF J1
123
DS1 (b) USB BAV74LT1 DS1 (a) BAV74LT1
5 1 3 2
GRN LED D2 J2 0 U1
RED LED D1
ADP
EN USB ADP BAT TS CT
AAT3689
USB STAT2 STAT1 USBSET ADPSET GND
10 7 8 11 12 4
R5 1.5K
R4 1.5K
BAT TS C1 10F C2 10F C3 10F R3 10K CT C4 0.1F
6 9
R1 8.06K
R2 8.06K
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger
AAT3689 Evaluation Board Bill of Materials
Component
U1
AAT3689
Part Number
AAT3689IFP-4.2-T1
Description
0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger; 12-Pin 3x3 TDFN Package 8.06K, 1%, 1/4W; 0603 10K, 5%, 1/4W; 0603 1.5K, 5%, 1/4W; 0603 CER 10F 10V 10% X5R 0805 CER 0.1F 16V 10% X7R 0603 Conn. 3-pin Header, 2mm zip 0 Red LED; 1206 Green LED; 1206 Default Diode; SOT23-3
Manufacturer
AnalogicTech
R1, R2 R3 R4, R5 C1, C2, C3 C4 JP1 JP2 D1 D2 DS1 (a, b)
Chip Resistor Chip Resistor Chip Resistor GRM21BR61A106KE19 GRM188R71C104KA01 PRPN401PAEN Chip Resistor CMD15-21SRC/TR8 CMD15-21VGC/TR8 BAV74LT-A
Vishay Vishay Vishay Murata Murata Sullins Electronics Vishay Chicago Miniature Lamp Chicago Miniature Lamp On Semi
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3689.2006.11.1.0
0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger Ordering Information
Package
TDFN33-12
AAT3689
Marking1
RQXYY
Part Number (Tape and Reel)2
AAT3689IWP-4.2-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 Information3
TDFN33-12
Index Area
Detail "A"
0.43 0.05
0.1 REF
3.00 0.05 2.40 0.05
Pin 1 Indicator (optional)
3.00 0.05
1.70 0.05
Top View
Bottom View Detail "A"
0.75 0.05
0.05 0.05
Side View
All dimensions in millimeters.
1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection. 3689.2006.11.1.0
0.23 0.05
0.23 0.05
0.45 0.05
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0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger
AAT3689
(c) 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.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737- 4600 Fax (408) 737- 4611 20
3689.2006.11.1.0

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