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ISL9205
Data Sheet March 20, 2007 FN9252.0
Li-ion Battery Charger
The ISL9205 is an integrated single-cell Li-ion or Li-polymer charger capable of operating at an input voltage as low as 2.5V. The low operating voltage allows the charger to work with a variety of AC adapters. The ISL9205 operates as a linear charger when the AC adapter is a voltage source. The battery is charged in a standard Li-ion charge profile, i.e. a constant current phase followed be a constant voltage phase (CC/CV). The charge current during the constant current phase is determined by the external resistor connected to the IREF pin. When the adapter output is a current-limited voltage source and the current limit is smaller than the programmed constant current of the IC, the ISL9205 operates as a pulse charger where the charge current is determined by the current limit of the AC adapter during the constant current phase. The ISL9205 operates in a linear mode during the constant voltage phase in both adapter cases. The ISL9205 incorporates ThermaguardTM which protects the IC against over temperature. If the die temperature rises above a typical value of +100C, the thermal foldback function reduces the charge current to prevent further temperature rise. The ISL9205 includes an external temperature monitoring function (not available in some package options). A negative temperature coefficient (NTC) thermistor is connected between the TEMP pin and GND to monitor the battery or ambient temperature. The ISL9205 also includes a timer to set the time reference for various charge time limits. The timer is programmable with an external capacitor. A logic input and two open-drain logic outputs are available for controlling the charger and indicating the charger status. The EN pin enables the charger. The ISL9205B, ISL9205C, and ISL9205D incorporate a a timeout function so that the charge is terminated when the preset time limits have been reached. The FAULT pin is an open-drain output which turns on when a fault condition is encountered. The STATUS pin is also an open-drain output which turns on when the charger is delivering current.
Features
* Complete Charger for Single-Cell Li-ion/Polymer Batteries * Integrated Pass Element and Current Sensor * No External Blocking Diode Required * Low Component Count and Cost * 25mV Voltage Accuracy Over-Temperature and Input Voltage Range * 15mV Voltage Accuracy at Room Temperature * Programmable Charge Current * Charge Current Thermal Foldback for Thermal Protection (ThermaguardTM) * Trickle Charge for Fully Discharged Batteries * Power Presence and Charge Indications * NTC Interface (ISL9205D) * Less than 3A Leakage Current off the Battery when No Input Power Attached or Charger Disabled * Ambient Temperature Range: -40C to +85C * DFN Packages * Pb-free plus anneal available (RoHS compliant)
Applications
* Mobile Phones * Blue-Tooth Devices * PDAs * MP3 Players * Stand-Alone Cradle or Travel Chargers * Other Handheld Devices
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2007. All Rights Reserved. Thermaguard is a trademark of Intersil Americas Inc. All other trademarks mentioned are the property of their respective owners.
ISL9205 Ordering Information
PART NUMBER (NOTE) ISL9205AIRZ ISL9205AIRZ-T ISL9205BIRZ ISL9205BIRZ-T ISL9205CIRZ ISL9205CIRZ-T ISL9205DIRZ ISL9205DIRZ-T PART MARKING DLCA DLCA DLDA DLDA DLEA DLEA DLFA DLFA TEMP. RANGE (C) -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 VBAT (V) 4.2 4.2 4.2 4.2 4.256 4.256 4.2 4.2 VSEN YES YES YES YES YES YES NO NO TEMP NO NO NO NO NO NO YES YES TIMEOUT NO NO YES YES YES YES YES YES PACKAGE (Pb-free) PKG DWG. #
10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
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ISL9205 Pin Description
VIN (Pin 1)
VIN is the input power source. Connect to a wall adapter.
EN (Pin 6)
EN is the enable logic input. Connect the EN pin to LOW to disable the charger or leave it floating to enable the charger. There is an internal 400k pull-up resistor at this pin.
FAULT (Pin 2)
FAULT is an open-drain output indicating fault status. This pin is pulled to LOW under any fault condition. When a fault condition occurs, the time counter will be reset. When the charger is disabled, the FAULT pin outputs high impedance.
V2P8 (Pin 7)
This is a 2.8V reference voltage output. This pin provides a 2.8V voltage source when the input voltage is above the POR threshold and outputs zero otherwise. The V2P8 pin can be used as an indication for adapter presence.
STATUS (Pin 3)
STATUS is an open-drain output indicating charging and inhibit states. The STATUS pin is pulled LOW when the charger is charging a battery. It will be turned into high impedance when the charge current drops to IMIN. This high impedance state will be latched until a recharge cycle or a new charge cycle starts. When the charger is disabled, the STATUS pin outputs high impedance.
IREF (Pin 8)
This is the charge current programming and monitoring pin. Connect a resistor between this pin and GND to set the charge current during the constant current phase, as given by Equation 1:
80 I REF = ---------------R IREF (A) (EQ. 1)
TIME (Pin 4)
The TIME pin determines the oscillation period by connecting a timing capacitor between this pin and GND. The oscillator also provides a time reference for the charger.
Where RIREF is in k.
TEMP (Pin 9 for ISL9205D; N/A for ISL9205A, ISL9205B, and ISL9205C)
TEMP is the input for an external NTC thermistor. The TEMP pin is also used for battery removal detection.
GND (Pin 5)
GND is the connection to system ground.
VSEN (Pin 9 for ISL9205A,ISL9205B, and ISL9205C; N/A for ISL9205D)
VSEN is the remote voltage sense pin. Connect this pin as close to the battery positive terminal as possible. If the VSEN pin is left floating, its voltage drops to 0V and the charger operates in trickle mode.
VBAT (Pin 10)
VBAT is the connection to the battery. Typically a 10F Tantalum capacitor is needed for stability when there is no battery attached. When a battery is attached, only a 0.1F ceramic capacitor is required.
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ISL9205 Pinouts
ISL9205A, ISL9205B, ISL9205C (10 LD DFN TOP VIEW)
VIN VIN FAULT STATUS TIME GND 1 2 3 4 5 10 VBAT 9 8 7 6 VSEN IREF V2P8 EN FAULT STATUS TIME GND 1 2 3 4 5
ISL9205D (10 LD DFN) TOP VIEW
10 VBAT 9 8 7 6 TEMP IREF V2P8 EN
Typical Applications
ISL9205A, ISL9205B AND ISL9205C
5V WALL ADAPTER VIN 1 mF C1 1 R3 1 k R1 1 k R2 ISL9205A ISL9205B ISL9205C D1 D2 VSEN FAULT STATUS EN EN DIS 1F C3 V2P8 TIME CTIME 15nF IREF IMIN RIREF 80k VBAT 1F C2
+ BATTERY PACK
GND
ISL9205D
5V WALL ADAPTER VIN 1F C1 1 R3 VBAT 1F 1 k R1 1 k R2 ISL9205D RU D1 D2 TEMP FAULT STATUS EN EN DIS V2P8 TIME 1F C3 CTIME 15nF GND IREF IMIN RIREF 80k RT T C2 V2P8 + -
BATTERY PACK
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ISL9205
Absolute Maximum Ratings
Voltage Ratings for All Pins . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V Charge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0A ESD Rating Human Body Model (Per EIA JESD22 Method A114-B) . . . . .2kV Machine Model (Per EIA JED-4701 Method C-111) . . . . . . . 200V
Thermal Information
Thermal Resistance JA (C/W) JC (C/W) 3x3 DFN Package (Note 1), (Note 2) . . 48 6 Maximum Junction Temperature (Plastic Package). . . . . . . . +150C Maximum Storage Temperature Range . . . . . . . . .-65C to +150C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . +300C
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . .-40C to +85C Operating Supply Voltage (VIN Pin). . . . . . . . . . . . . . . 4.25V to 6.5V Programmed Charge Current . . . . . . . . . . . . . . . . . 50mA to 900mA
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. The 150C maximum junction temperature is for information purposes only. In reality, the current foldback feature will prevent the junction from rising above a worst case temperature of 125C.
NOTES: 1. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with "direct attach" features. See Tech Brief TB379. 2. For JC, the "case temp" location is the center of the exposed metal pad on the package underside.
Electrical Specifications
Typical Values Are Tested at VIN = 5V and the Ambient Temperature at +25C. All Maximum and Minimum Values Are Guaranteed Under the Recommended Operating Supply Voltage Range and Ambient Temperature Range, Unless Otherwise Noted. SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
PARAMETER POWER-ON RESET Rising POR Threshold Falling POR Threshold VIN-BAT OFFSET VOLTAGE Rising Edge STANDBY CURRENT BAT Pin Sink Current VIN Pin Supply Current VIN Pin Supply Current VOLTAGE REGULATION Output Voltage (Except ISL9205C)
VPOR VPOR
VBAT = 3.0V, use V2P8 pin to indicate the comparator output.
3.2 2.25
3.6 2.5
3.9 2.7
V V
VOS
VBAT = 4.2V, IBAT = 20mA, use STATUS pin to indicate the comparator output (Note 3
45
80
100
mV
ISTANDBY Charger disabled or the input is floating IVIN IVIN Charger disabled Charger enabled
-
150 1.0
3.3 250 -
A A mA
VCH VCH
Tested at 50mA load, 5V input, and +25C -40C < TA < +85C, 4.3V < VIN < 6.5V Tested at 50mA load, 5V input, and +25C -40C < TA < +85C, 4.3V < VIN < 6.5V VBAT = 4.0V, charge current = 0.35A
4.185 4.175 4.241 4.231 -
4.20 4.20 4.256 4.256 500
4.215 4.225 4.271 4.281 -
V V V V m
Output Voltage (ISL9205C)
VCH VCH
PMOS ON-Resistance CHARGE CURRENT (Note 4) Constant Charge Current Trickle Charge Current End-of-Charge Current V2P8 PIN OUTPUT V2P8 Pin Output Voltage
rDS(ON)
ICC ITRK IMIN
RIREF = 100k, VBAT = 3.0V to 4.0V RIREF = 100k, VBAT = 0V to 2.5V RIREF = 100k
760 64 70
800 80 80
840 96 90
mA mA mA
VV2P8
Load current less than 1mA
2.8
2.9
3.0
V
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ISL9205
Electrical Specifications
Typical Values Are Tested at VIN = 5V and the Ambient Temperature at +25C. All Maximum and Minimum Values Are Guaranteed Under the Recommended Operating Supply Voltage Range and Ambient Temperature Range, Unless Otherwise Noted. (Continued) SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
PARAMETER TRICKLE CHARGE THRESHOLDS Preconditioning Charge Threshold Voltage Preconditioning Voltage Hysteresis Recharge Threshold Recharge Threshold Hysteresis INTERNAL TEMPERATURE MONITORING Charge Current Foldback Threshold
VMIN VMINHYS VRCH VRCHHYS Referenced to the charger output voltage VCH
2.7 50 -225 -
2.8 100 -150 50
2.9 150 -70 -
V mV mV mV
TFOLD
110
C
AMBIENT TEMPERATURE MONITORING (ISL9205D only) High Voltage Threshold High Voltage Threshold Hysteresis Low Voltage Threshold Low Voltage Threshold Hysteresis OSCILLATOR Oscillation Period LOGIC INPUT AND OUTPUTS EN/TOEN Pin Logic Input High EN/TOEN Pin Logic Input Low EN/TOEN Pin Internal Pull Up Resistance STATUS/FAULT Output Voltage When On STATUS/FAULT Leakage Current NOTE: 3. The 4.2V VBAT is selected so that the STATUS output can be used as the indication for the offset comparator output indication. If the VBAT is lower than the POR threshold, no output pin can be used for indication. 4. The charge current can be affected by the thermal foldback function if the IC under the test setup cannot dissipate the heat. 10mA current VSTATUS = 6.5V 1.3 200 400 0.5 600 0.8 1 V V k V A tOSC CTIME = 15nF 2.7 3.0 3.3 ms V2P8 = 3.0V V2P8 = 3.0V V2P8 = 3.0V V2P8 = 3.0V 1.98 0.99 2.0 1.9 1 1.1 2.02 1.01 V V V V
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ISL9205
Typical Operating Performance
4.210 4.206 4.202
The test conditions for the Typical Operating Performance are: VIN = 5V, TA = +25C, RIREF = RIMIN = 100k, VBAT = 3.7V, Unless Otherwise Noted
4.210 4.204 4.198 4.192 4.186 CHARGE CURRENT = 50 mA 4.180
VBAT (V)
4.198 4.194
4.190 0.0
VBAT (V)
0.2
0.4
0.6
0.8
1.0
0
20
40
60
80
100
120
CHARGE CURRENT (mA)
TEMPERATURE (C)
FIGURE 1. CHARGER OUTPUT VOLTAGE vs CHARGE CURRENT
FIGURE 2. CHARGER OUTPUT VOLTAGE vs TEMPERATURE
4.30 IBAT = 50mA 4.24 0.96 0.90 0.84 0.78 0.72 4.06 0.66 0.60 4.5 4.8 5.1 VIN (V) 5.4 5.7 6.0 3.0 3.2 3.4 3.6 VBAT (V) 3.8 4.0 4.2
VBAT (V)
4.12
4.00 4.2
FIGURE 3. CHARGER OUTPUT VOLTAGE vs INPUT VOLTAGE CHARGE CURRENT IS 50mA
1.00 0.96 CHARGE CURRENT (mA) 0.86 0.90 0.84 0.78 0.72 0.44 0.66 0.60 4.2 0 20 40 60 80 100 120 TEMPERATURE (C)
0.58
0.30
IBAT (A)
0.72
IBAT (A)
4.18
FIGURE 4. CHARGE CURRENT vs OUTPUT VOLTAGE
4.6
5.0 VIN (V)
5.4
5.8
6.2
FIGURE 5. CHARGE CURRENT vs AMBIENT TEMPERATURE
FIGURE 6. CHARGE CURRENT vs INPUT VOLTAGE
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ISL9205 Typical Operating Performance
2.90
The test conditions for the Typical Operating Performance are: VIN = 5V, TA = +25C, RIREF = RIMIN = 100k, VBAT = 3.7V, Unless Otherwise Noted (Continued)
2.90
2.88
2.88
V2P8 (V)
2.84
VIN (V) 3.5 4.1 4.7 VIN (V) 5.3 5.9 6.5
2.86
2.86
2.84
2.82
2.82
2.80
2.80 0.0
2.0
4.0
6.0
8.0
10.0
V2P8 LOAD CURRENT (mA)
FIGURE 7. V2P8 OUTPUT vs INPUT VOLTAGE
FIGURE 8. V2P8 OUTPUT vs ITS LOAD CURRENT
1.0
1.20
0.9
1.08
rDS(ON ) ()
0.7
rDS(ON) () 0 20 40 60 80 100
0.8
0.96
0.84
0.6
0.72
0.5
0.60 2.9 3.1 3.3 3.5 3.7 VBAT (V) 3.9 4.1
TEMPERATURE (C)
FIGURE 9. rDS(ON) vs TEMPERATURE AT 3.7V OUTPUT
FIGURE 10. rDS(ON) vs OUTPUT VOLTAGE USING CURRENT LIMITED ADAPTERS
0.50
0.80 0.70
0.40
ENABLED 0.60 Iq (mA) ENABLED 0.50 0.40 0.30
Iq (mA)
0.30
0.20
DISABLED
0.10
0.20 0.10 3.0 3.6 4.2 VIN (V) 4.8 5.4 6.0
DISABLED
0.00
0
20
40
60
80
100
120
TEMPERATURE (C)
FIGURE 11. INPUT QUIESCENT CURRENT vs INPUT VOLTAGE
FIGURE 12. INPUT QUIESCENT CURRENT vs TEMPERATURE
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ISL9205 Functional Block Diagram
VIN Q MAIN VBAT
C1 TEMPERATURE MONITORING QSEN 100000:1 CURRENT MIRROR ISEN
REFERENCES VRECHRG V POR V MIN V CH
V2P8
IT
VIN
VSEN
INPUT_OK
+ V POR + 80mV -
R IREF
IREF
IR CURRENT REFERENCES IMIN = IR/10
+ CA CHRG + VA -
+ -
V CH + TRICKLE/FAST MINBAT I SEN (16 LD OPTION) + MIN_I INPUT_OK + RECHARGE LOGIC EN STATUS TEMP TEMP MONITOR ESD DIODE STATUS VMIN VRECHRG
TIME GND
OSC
COUNTER FAULT
FAULT
Theory of Operation
The ISL9205 is an integrated charger for single-cell Li-ion or Li-polymer batteries. The ISL9205 is capable of operating in two operation modes, linear charge mode and pulse charge mode. The ISL9205 functions as a traditional linear charger when powered with a voltage source adapter. When powered with a current-limited adapter, the charger functions as a pulse charger by fully turning on the pass element and the power dissipation is hence drastically reduced.
mode, depending on the battery voltage. When the battery voltage is lower than 2.8V, the charger operates in trickle mode where the charge current is set at 10% of the constant current mode current. The trickle mode is for preconditioning a deeply discharged battery. Once the battery voltage is above the typical 2.8V threshold, the constant current (CC) mode starts. The constant current is programmable between 50mA to 1A.
Constant Voltage Phase
When the battery reaches the final voltage, the ISL9205 switches the operation to a constant voltage (CV) phase. The output voltage is regulated at the final voltage value. During the constant voltage phase, the charge current reduces gradually as the cell voltage rises.
Constant Current Phase
The ISL9205 starts the charge at a constant current (CC) phase. The charge current is regulated to fast charge the battery before the final voltage has been reached. The charge current is programmable with the IREF pin and has two operation modes: trickle mode and constant current
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ISL9205
Charge Termination and Recharge
As the charge current reaches the EOC (end-of-charge) current threshold during the constant voltage phase, the STATUS pin open-drain FET is turned off to indicate an EOC condition. The EOC current is fixed at 10% of the programmed constant charge current. If the timeout function is available (ISL9205B, ISL9205C and ISL9205D), the charger will be terminated when the user programmed charge time limit has been reached. If the timeout function is not available (ISL9205A), the charger will continue to charge until the EN pin is pulled to logic LOW or the input power has been removed. Should the charge is terminated by the timeout function, recharge will occur when the battery voltage falls to 150mV below the constant voltage value. The STATUS open-drain FET is turned on when a recharge condition is met, whether the charger is previously terminated or not. An internal delay is implemented at the STATUS pin for both EOC and recharge conditions to prevent nuisance trips due to noise and fast load current transitions. The delay time is approximately one clock cycle (varies between 0.5 and 1.5 clock) of the internal oscillator, which is programmed by the timer capacitor. The typical charge waveforms in Figure 13 show the complete cycle operation.
TRICKLE 4.2V IREF 1/8 OF TIMEOUT CC CV CHARGE VOLTAGE CHARGE CURRENT
battery, the TEMP function can be used to discover a battery removal condition when the TEMP pin voltage is much higher than the reference threshold.
POR
The power-on reset (POR) function monitors the supply voltage. The POR has a rising edge threshold of 3.6V typical and 2.5V typical for falling edge. The charger is expected to operate when the input voltage is above the POR threshold. After POR the charger will continue to operate for supply voltage down to 2.5V typical. It is also required that the supply voltage be higher than the VBAT pin voltage by a typical 80mV for the charger to function.
Oscillator, TIMEOUT and Charge Cycle
The ISL9205 incorporates with an oscillation circuit using an external timing capacitor connected to the TIME pin. The oscillator sets the limit for the maximum charge time during the trickle mode and the fast mode (CC and CV). The maximum charge time (TIMEOUT) for the fast mode is set by:
TIMEOUT = 2
22
t OSC
(EQ. 2 1)
VREC
where the tOSC is the oscillator period. The minimum programmable tOSC is 20S (CTIME = 100pF). The time limit for the trickle charge is 1/8 of the fast mode time limit. For the ISL9205A, there is no time-out function and hence the charger will never be turned off after the EOC but will indicate the EOC condition through the STATUS pin. A charge cycle is the time interval between the time when the charger is enabled to the moment it is disabled. If the battery voltage is lower than the trickle charge threshold at the time the charger is enabled, the charger enters the trickle mode and the timer is reset and its limit is set to 1/8 of TIMEOUT. For ISL9205B, ISL9205C and ISL9205D, the charger will stop and indicate a TIMEOUT fault if the charge time is longer than the limit. If the trickle mode completes successfully before the time limit, the charger moves to CC mode and the timer is reset and the time limit is set to TIMEOUT. The charger needs to reach the EOC conditions before the TIMEOUT interval elapsed, otherwise, a TIMEOUT fault will be issued. The charger indicates the EOC with the STATUS pin but does not terminate until the TIMEOUT interval elapsed.
2.8V TIMEOUT 10% IREF IMIN
CHG
STATUS INDICATION TIME
FIGURE 13. TYPICAL CHARGE CYCLE WITH TIMEOUT
Temperature Monitoring and Thermal Foldback
In the event where the die temperature reaches the thermal foldback threshold (+110C typical), the charge current is reduced accordingly to prevent further temperature rise. In the ISL9205D, there is an external temperature monitoring function. A negative temperature coefficient (NTC) thermistor can be connected between the TEMP pin and GND to monitor the battery temperature or ambient temperature. The hysteresis comparators internal to the ISL9205 provide a valid temperature window centered at the voltage of the TEMP pin, which is programmed by the NTC and the pull-up resistor connected to the pin. When the measured temperature is outside this window, the charger is paused (both the charger and the timer are stopped) and a fault indication is issued. If the thermistor is attached to the
Indications
The ISL9205 has two open-drain status indication pins. These two pins are FAULT and STATUS. These pins require an external pull-up resistor to function properly. The V2P8 pin can be used as the presence of AC adapter.
Charger Disable
The EN pin allows the user to disable the charger. When the charger is disabled, all internal circuits are shut down and the quiescent current at the input pin is less than a typical value of 150mA.
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ISL9205
Remote Battery Voltage Sensing
In the ISL9205A, ISL9205B and ISL9205C versions, a Kelvin sense pin is provided for battery terminal voltage monitoring. Thus, the IR drop due to the connection leads and PCB traces can be eliminated, resulting a more accurate battery voltage monitoring, especially when the battery is located at a significant distance away from the ISL9205. If remote sensing is not needed, the VSEN pin can be connected to VBAT at the IC. two paths to exit the trickle charge, one is when the battery voltage rises above the preconditioning charge threshold within the 1/8 TIMEOUT interval and the other is when the 1/8 TIMEOUT interval has been elapsed before reaching the preconditioning charge voltage threshold. When TIMEOUT fault occurs, the charger enters the TIMEOUT fault state. There are only two ways to exit the TIMEOUT fault state, by toggling the EN input or re-cycling the input power. If the charger finishes the trickle charger before the 1/8 TIMEOUT limit, it moves to the fast charge state. When entering the fast charge state, the TIMEOUT timer is reset as well. If the charger hits EOC conditions before the TIMEOUT, the charger enters Charge Compete state. The charger stays on but the STATUS indicates EOC condition, until the TIMEOUT (starting from entering the fast charge state) is reached then the charger moves to the Inhibit state. In the Inhibit state, the charger is off and the EOC condition continues to be indicated.
Applications Information
PCB Layout Guidance
The ISL9205 uses a thermally-enhanced DFN package that has an exposed thermal pad at the bottom side of the package. The layout should connect as much as possible to copper on the exposed pad. Typically the component layer is more effective in dissipating heat. The thermal impedance can be further reduced by using other layers of copper connecting to the exposed pad through a thermal via array. A minimum of four (4) such thermal vias are recommended. Each thermal via is recommended to have 0.3mm diameter and 0.7mm distance from other thermal vias.
Stability Consideration
The ISL9205 should behave like a current and thermal limited linear regulator. The charger operation is stable with an output ceramic decoupling capacitor in the range of 1F to 200F, with or without a battery connected.
Input Bypass Capacitor
Due to the inductance of the power leads of the wall adapter or USB source, the input capacitor type must be properly selected to prevent high voltage transient during a hot-plug event. A tantalum capacitor is a good choice for its high ESR, providing damping to the voltage transient. Multi-layer ceramic capacitors, however, have a very low ESR and hence when chosen as input capacitor, a 1 series resistor must be used, as shown in the "Typical Applications" on page 4, to provide adequate damping.
2.8V Bias Voltage
The ISL9205 provides a 2.8V voltage for biasing the internal control and logic circuit. This voltage is also available for external circuits such as the NTC thermistor circuit. The maximum allowed external load is 2mA. A bypass capacitor is needed at this pin for best performace. It is recommentded to use a minimum 1.0F, X5R type of ceramic capacitor.
State Machine Diagram
The state machine diagram is shown in Figure 14. The diagram starts with the Power-Off state. When the input voltage rises above the POR threshold, the charger resets itself. Then, if the charger is disabled, the charger stays in the Charger Disabled state. If the charger is enabled, the trickle charge starts. Anytime when entering the trickle charge state, the internal TIMEOUT timer is reset. There are 11
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ISL9205
PWR OFF CHARGER: OFF STATUS: OFF FAULT: OFF V IN > V POR NOT ENABLED CHARGER DISABLED CHARGER: OFF STATUS: OFF FAULT: OFF ANYTIME EN PIN CHANGES TO DISABLE ENABLED
POR CHARGER: OFF STATUS: OFF FAULT: OFF NOTE 3: ISL6292 AND ISL6292C ALWAYS HAVE 1/8 TIMEOUT LIMIT FOR TRICKLE CHARGE, BUT NOT ISL9203.
TRICKLE TEMP FAULT REMOVED TEMP FAULT CHARGER: OFF STATUS: OFF FAULT: ON V BAT DROPS BELOW VMIN ANYTIME A TEMP FAULT OCCURS (EXCEPT IN TIMEOUT FAULT) CHARGE CHARGER: ON STATUS: ON FAULT: OFF
VBAT < V MIN WHEN 1/8 TIMEOUT COMPLETES
TIMEOUT CHARGER: OFF STATUS: OFF FAULT: ON
DISABLE VBAT> VMIN BEFORE 1/8 TIMEOUT COMPLETES
FAST CHARGE CHARGER: ON STATUS: ON FAULT: OFF TIMEOUT
TO CHARGER DISABLED BLOCK
VBAT > VRCH AND ICHG < IMIN CHARGE COMPLETE CHARGER: ON STATUS: OFF FAULT: OFF VBAT < VRCH
TIMEOUT INHIBIT CHARGER: OFF STATUS: OFF FAULT: OFF
V BAT < VRCH
FIGURE 14. STATE MACHINE DIAGRAM
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ISL9205 Dual Flat No-Lead Plastic Package (DFN)
2X 0.15 C A A D 2X 0.15 C B
L10.3x3
10 LEAD DUAL FLAT NO-LEAD PLASTIC PACKAGE MILLIMETERS SYMBOL A A1 MIN 0.80 0.18 1.95 1.55 0.25 0.30 NOMINAL 0.90 0.20 REF 0.23 3.00 BSC 2.00 3.00 BSC 1.60 0.50 BSC 0.35 10 5 0.40 1.65 2.05 0.28 MAX 1.00 0.05 NOTES 5,8 7,8 7,8 8 2 3 Rev. 3 6/04 NOTES: 1. Dimensioning and tolerancing conform to ASME Y14.5-1994. 2. N is the number of terminals. 3. Nd refers to the number of terminals on D. 4. All dimensions are in millimeters. Angles are in degrees. 5. Dimension b applies to the metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. 6. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 identifier may be either a mold or mark feature. 7. Dimensions D2 and E2 are for the exposed pads which provide improved electrical and thermal performance. 8. Nominal dimensions are provided to assist with PCB Land Pattern Design efforts, see Intersil Technical Brief TB389.
E 6 INDEX AREA TOP VIEW B
A3 b D D2 E E2
0.10 C
e k L N Nd
A 0.08 C C SEATING PLANE SIDE VIEW A3
7 (DATUM B) 6 INDEX AREA (DATUM A) 1 2 D2
8
D2/2 NX k E2 E2/2
NX L N 8 N-1 NX b e (Nd-1)Xe REF. BOTTOM VIEW 5 0.10 M C A B
C L 0.415 NX (b) 5 SECTION "C-C" C NX b (A1) 0.200 L NX L e CC TERMINAL TIP
FOR ODD TERMINAL/SIDE
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 13
FN9252.0 March 20, 2007

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