ISL9205 ® Data Sheet July 28, 2010 FN9252.2 Li-ion Battery Charger Features 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. • Complete Charger for Single-Cell Li-ion/Polymer Batteries 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. • Low Component Count and Cost The ISL9205 incorporates Thermaguard™ which protects the IC against over temperature. If the die temperature rises above a typical value of +100°C , 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. Two logic inputs and two open-drain logic outputs are available for controlling the charger and indicating the charger status. The EN pin enables the charger, TOEN pin (available in ISL9205) enables the 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. 1 • Integrated Pass Element and Current Sensor • No External Blocking Diode Required • 25mV Voltage Accuracy Over-Temperature and Input Voltage Range • 15mV Voltage Accuracy at Room Temperature • Programmable Charge Current • Programmable End-of-Charge Current (ISL9205) • Charge Current Thermal Foldback for Thermal Protection (Thermaguard™) • Trickle Charge for Fully Discharged Batteries • Power Presence and Charge Indications • NTC Interface (not available in some package options) • Less than 3µA Leakage Current off the Battery when No Input Power Attached or Charger Disabled • Ambient Temperature Range: -40°C to +85°C • DFN, QFN Packages • Pb-Free (RoHS Compliant) Applications • Mobile Phones • Blue-Tooth Devices • PDAs • MP3 Players • Stand-Alone Cradle or Travel Chargers • Other Handheld Devices 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. Thermaguard is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2007, 2010. All Rights Reserved All other trademarks mentioned are the property of their respective owners. ISL9205 Ordering Information PART NUMBER* (Note) PART MARKING TEMP. RANGE (°C) VBAT (V) VSEN TEMP TIMEOUT PACKAGE (Pb-free) PKG DWG. # ISL9205IRZ DLBA -40 to +85 4.2 YES YES YES 16 Ld 3x3 QFN L16.3x3B ISL9205AIRZ DLCA -40 to +85 4.2 YES NO NO 10 Ld 3x3 DFN L10.3x3 ISL9205BIRZ DLDA -40 to +85 4.2 YES NO YES 10 Ld 3x3 DFN L10.3x3 ISL9205CIRZ DLEA -40 to +85 4.256 YES NO YES 10 Ld 3x3 DFN L10.3x3 ISL9205DIRZ DLFA -40 to +85 4.2 NO YES YES 10 Ld 3x3 DFN L10.3x3 *Add “-T” suffix for tape and reel. 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. Pinouts ISL9205A, ISL9205B, ISL9205C (10 LD DFN) TOP VIEW 13 VBAT 14 VBAT VSEN 3 8 IREF 3 4 9 TIME 4 7 V2P8 GND 5 6 EN 8 9 STATUS V2P8 2 11 TEMP 10 IMIN 7 FAULT 2 EN 1 6 TIME 10 VBAT 5 STATUS 1 GND FAULT VIN 12 VSEN TOEN VIN 15 VIN 16 VIN ISL9205 (16 LD QFN) TOP VIEW IREF ISL9205D (10 LD DFN TOP VIEW 2 VIN 1 10 VBAT FAULT 2 9 TEMP STATUS 3 8 IREF TIME 4 7 V2P8 GND 5 6 EN FN9252.2 July 28, 2010 ISL9205 Typical Applications For 3x3 QFN Package Option 5V WALL ADAPTER 1kΩ R1 1µF C1 1kΩ R2 VIN VBAT VIN VBAT VIN 1µF D1 D2 FAULT STATUS TOEN EN VSEN 1µF C3 BATTERY PACK T RU RT TEMP IREF IMIN RIMIN V2P8 TIME V2P8 C2 ISL9205IRZ GND RIREF 100kΩ 100kΩ CTIME 15nF For 3x3 DFN Package Option 5V WALL ADAPTER VIN 1µF C1 VBAT 1µF 1kΩ R1 1kΩ R2 D1 D2 ISL9205AIRZ C2 BATTERY PACK VSEN FAULT STATUS IREF EN V2P8 1µF C3 3 TIME GND RIREF 100kΩ CTIME 15nF FN9252.2 July 28, 2010 ISL9205 Pin Description VIN (Pin 1, 15, 16 for ISL9205; Pin 1 for ISL9205A, ISL9205B, ISL9205C and ISL9205D) VIN is the input power source. Connect to a wall adapter. 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. 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. 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. GND (Pin 5) GND is the connection to system ground. TOEN (Pin 6 for ISL9205; N/A for ISL9205A, ISL9205B, ISL9205C and ISL9205D) TOEN is the TIMEOUT enable input pin. Pulling this pin to LOW disables the TIMEOUT charge-time limit for the fast charge modes. Leaving this pin HIGH or floating enables the TIMEOUT limit. There is an internal 400kΩ pull-up resistor at this pin. EN (Pin 7 for ISL9205; Pin 6 for ISL9205A, ISL9205B, ISL9205C and ISL9205D) 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 400kΩ pull-up resistor at this pin. V2P8 (Pin 8 for ISL9205; Pin 7 for ISL9205A, ISL9205B, ISL9205C and ISL9205D) 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. IREF (Pin 9 for ISL9205; Pin 8 for ISL9205A, ISL9205B, ISL9205C and ISL9205D) 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 (EQ. 1) (A) Where RIREF is in kΩ. IMIN (Pin 10 for ISL9205; N/A for ISL9205A, ISL9205B, ISL9205C and ISL9205D) IMIN is the end-of-charge (EOC) current programming pin. Connect a resistor between this pin and GND to set the EOC current, as given by Equation 2: 8000 I MIN = ---------------R IMIN ( mA ) (EQ. 2) Where RIMIN is in kΩ. TEMP (Pin 11 for ISL9205; 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. VSEN (Pin 12 ISL9205; Pin 9 for ISL9205A, ISL9205B and ISL9205; 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 zero volt and the charger operates in trickle mode. VBAT (Pin 13, 14 for ISL9205; Pin 10 for ISL9205A, ISL9205B, ISL9205C and ISL9205D) VBAT is the connection to the battery. Typically a 10μF Tantalum capacitor is needed for stability when there is no battery attached. When a battery is attached, only a 0.1μF ceramic capacitor is required. 4 FN9252.2 July 28, 2010 ISL9205 Absolute Maximum Ratings Thermal Information Voltage Ratings for All Pins . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V Charge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0A ESD Rating Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2kV Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200V Thermal Resistance θJA (°C/W) θJC (°C/W) 3x3 DFN Package (Note 1) . . . . . . . . . 48 6 3X3 QFN Package (Note 2) . . . . . . . . 54 6 Maximum Junction Temperature (Plastic Package). . . . . . . . +150°C Maximum Storage Temperature Range . . . . . . . . .-65°C to +150°C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . +300°C Recommended Operating Conditions Ambient Temperature Range . . . . . . . . . . . . . . . . . . .-40°C to +85°C 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 150°C 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 125°C. NOTES: 1. θJA 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 θJC, 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 +25°C. All Maximum and Minimum Values Are Guaranteed Under the Recommended Operating Supply Voltage Range and Ambient Temperature Range, Unless Otherwise Noted. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS 3.2 3.6 3.9 V 2.25 2.5 2.7 V 45 80 100 mV - - 3.3 μA POWER-ON RESET Rising POR Threshold VPOR Falling POR Threshold VPOR VBAT = 3.0V, use V2P8 pin to indicate the comparator output. VIN-BAT OFFSET VOLTAGE Rising Edge VOS VBAT = 4.2V, IBAT = 20mA, use STATUS pin to indicate the comparator output (Note 3) STANDBY CURRENT BAT Pin Sink Current ISTANDBY Charger disabled or the input is floating VIN Pin Supply Current IVIN Charger disabled - 150 250 μA VIN Pin Supply Current IVIN Charger enabled - 1.0 - mA VCH Tested at 50mA load, 5V input, and +25°C 4.185 4.20 4.215 V VCH -40°C < TA < +85°C, 4.3V < VIN < 6.5V 4.175 4.20 4.225 V VCH Tested at 50mA load, 5V input, and +25°C 4.241 4.256 4.271 V VCH -40°C < TA < +85°C, 4.3V < VIN < 6.5V 4.231 4.256 4.281 V VOLTAGE REGULATION Output Voltage (Except ISL9205C) Output Voltage (ISL9205C) rDS(ON) VBAT = 4.0V, charge current = 0.35A - 500 - mΩ Constant Charge Current ICC RIREF = 100kΩ, VBAT = 3.0V to 4.0V 760 800 840 mA Trickle Charge Current ITRK RIREF = 100kΩ, VBAT = 0V to 2.5V 64 80 96 mA End-of-Charge Current IMIN RIMIN = 100kΩ (ISL9205) 70 80 90 mA End-of-Charge Current IMIN RIREF = 100kΩ (ISL9205A, ISL9205B, ISL9205C and ISL9205D) 70 80 90 mA Load current less than 1mA 2.8 2.9 3.0 V PMOS ON-Resistance CHARGE CURRENT (Note 4) V2P8 PIN OUTPUT V2P8 Pin Output Voltage VV2P8 5 FN9252.2 July 28, 2010 ISL9205 Electrical Specifications Typical Values Are Tested at VIN = 5V and the Ambient Temperature at +25°C. All Maximum and Minimum Values Are Guaranteed Under the Recommended Operating Supply Voltage Range and Ambient Temperature Range, Unless Otherwise Noted. (Continued) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS VMIN 2.7 2.8 2.9 V VMINHYS 50 100 150 mV -225 -150 -70 mV VRCHHYS - 50 - mV TFOLD - 110 - °C CHARGE THRESHOLDS Preconditioning Charge Threshold Voltage Preconditioning Voltage Hysteresis Recharge Threshold VRCH Recharge Threshold Hysteresis Referenced to the charger output voltage VCH INTERNAL TEMPERATURE MONITORING Charge Current Foldback Threshold AMBIENT TEMPERATURE MONITORING (ISL9205 and ISL9205D) High Voltage Threshold V2P8 = 3.0V 1.98 2.0 2.02 V High Voltage Threshold Hysteresis V2P8 = 3.0V - 1.9 - V Low Voltage Threshold V2P8 = 3.0V 0.99 1 1.01 V Low Voltage Threshold Hysteresis V2P8 = 3.0V - 1.1 - V 2.7 3.0 3.3 ms EN/TOEN Pin Logic Input High 1.3 - - V EN/TOEN Pin Logic Input Low - - 0.5 V 200 400 600 kΩ OSCILLATOR Oscillation Period tOSC CTIME = 15nF LOGIC INPUT AND OUTPUTS EN/TOEN Pin Internal Pull Up Resistance STATUS/FAULT Output Voltage When On 10mA current - - 0.8 V STATUS/FAULT Leakage Current VSTATUS = 6.5V - - 1 μA 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. 6 FN9252.2 July 28, 2010 ISL9205 The test conditions for the Typical Operating Performance are: VIN = 5V, TA = +25°C, RIREF = RIMIN = 100kΩ, VBAT = 3.7V, Unless Otherwise Noted 4.210 4.210 4.206 4.204 4.202 4.198 VBAT (V) VBAT (V) Typical Operating Performance 4.198 4.192 4.186 4.194 CHARGE CURRENT = 50 mA 4.180 4.190 0.0 0.2 0.4 0.6 0.8 1.0 0 20 40 60 80 100 120 TEMPERATURE (°C) CHARGE CURRENT (mA) FIGURE 2. CHARGER OUTPUT VOLTAGE vs TEMPERATURE FIGURE 1. CHARGER OUTPUT VOLTAGE vs CHARGE CURRENT 4.30 IBAT = 50mA 0.96 4.24 4.18 0.84 IBAT (A) VBAT (V) 0.90 4.12 0.78 0.72 4.06 0.66 4.00 4.2 0.60 4.5 4.8 5.1 5.4 5.7 6.0 3.0 3.2 VIN (V) 3.4 3.6 3.8 4.0 4.2 VBAT (V) FIGURE 3. CHARGER OUTPUT VOLTAGE vs INPUT VOLTAGE CHARGE CURRENT IS 50mA FIGURE 4. CHARGE CURRENT vs OUTPUT VOLTAGE 1.00 0.86 0.90 0.72 IBAT (A) CHARGE CURRENT (mA) 0.96 0.58 0.84 0.78 0.72 0.44 0.30 0.66 0 20 40 60 80 100 120 TEMPERATURE (°C) FIGURE 5. CHARGE CURRENT vs AMBIENT TEMPERATURE 7 0.60 4.2 4.6 5.0 5.4 5.8 6.2 VIN (V) FIGURE 6. CHARGE CURRENT vs INPUT VOLTAGE FN9252.2 July 28, 2010 ISL9205 The test conditions for the Typical Operating Performance are: VIN = 5V, TA = +25°C, RIREF = RIMIN = 100kΩ, VBAT = 3.7V, Unless Otherwise Noted (Continued) 2.90 2.90 2.88 2.88 2.86 2.86 VIN (V) V2P8 (V) Typical Operating Performance 2.84 2.84 2.82 2.80 2.82 3.5 4.1 4.7 5.3 5.9 2.80 0.0 6.5 2.0 VIN (V) 6.0 8.0 10.0 FIGURE 8. V2P8 OUTPUT vs ITS LOAD CURRENT 1.0 1.20 0.9 1.08 0.8 0.96 rDS(ON) (Ω) rDS(ON ) (Ω) FIGURE 7. V2P8 OUTPUT vs INPUT VOLTAGE 0.7 0.6 0.5 4.0 V2P8 LOAD CURRENT (mA) 0.84 0.72 0 20 40 60 80 0.60 100 2.9 3.1 3.3 TEMPERATURE (°C) FIGURE 9. rDS(ON) vs TEMPERATURE AT 3.7V OUTPUT 3.7 3.5 VBAT (V) 3.9 4.1 FIGURE 10. rDS(ON) vs OUTPUT VOLTAGE USING CURRENT LIMITED ADAPTERS 0.50 0.80 0.40 0.70 ENABLED ENABLED 0.30 Iq (mA) Iq (mA) 0.60 DISABLED 0.20 0.50 0.40 0.30 0.10 0.00 DISABLED 0.20 0.10 3.0 3.6 4.8 4.2 5.4 VIN (V) FIGURE 11. INPUT QUIESCENT CURRENT vs INPUT VOLTAGE 8 6.0 0 20 40 60 80 100 120 TEMPERATURE (°C) FIGURE 12. INPUT QUIESCENT CURRENT vs TEMPERATURE FN9252.2 July 28, 2010 ISL9205 Functional Block Diagram Q MAIN VIN C1 VBAT ISEN + CA - IR CURRENT REFERENCES V POR + - IREF VSEN VIN + INPUT_OK R IREF V2P8 VRECHRG IT V POR 100000:1 CURRENT MIRROR V MIN QSEN V CH REFERENCES TEMPERATURE MONITORING - + 80mV CHRG + VA - IMIN = IR/10 V CH + TRICKLE/FAST I SEN - MINBAT VMIN + - VRECHRG + MIN_I - INPUT_OK RECHARGE LOGIC ESD DIODE STATUS EN STATUS TEMP MONITOR TEMP OSC TIME COUNTER FAULT FAULT GND 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. two operation modes: trickle mode and constant current 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 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 9 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. FN9252.2 July 28, 2010 ISL9205 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. During the constant voltage phase, the charge current reduces gradually as the cell voltage rises. End-of-Charge 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 programmable for the ISL9205 by connecting a resistor from the IMIN pin to GND. For others, the EOC current is fixed at 10% of the programmed constant charge current. When the STATUS pin indicates the EOC condition, the charger will continue to charge until the EN pin is pulled to logic LOW or the input power has been removed. After EOC is reached, 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. 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 CC CV 4.2V IREF Charge Voltage VREC Charge Current 2.8V 10%IREF CHG IMIN 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 (+110°C typical), the charge current is reduced accordingly to prevent further temperature rise. In the ISL9205 and ISL9205D versions, 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 10 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 = 222tOSC where the tOSC is the oscillator period. The minimum programmable tOSC is 20μS (CTIME = 100pF). The time limit for the trickle charge is 1/8 of the fast mode time limit. In the ISL9205, the time-out function can be disabled by pulling the TOEN pin to logic LOW. When TIMEOUT is disabled, the charger will never be turned off in constant current and constant voltage modes. For the ISL9205B and the ISL9105D, the timeout function is always enforced. For the ISL9105A, there is not timeout function. 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. If the timeout function is enabled, 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 charging. Disabling TIMEOUT with TOEN In the ISL9205, the time-out function in fast charge state (CC/CV) can be disabled by pulling the TOEN pin to logic LOW. The timeout function for the trickle charge mode can not be disabled. Note that in the ISL9205A, there is no timeout function for both the trickle and the CC/CV intervals whereas in the ISL9205 with TOEN set pulled to LOW, there is no timeout for the CC/CV interval but the timeout function for the trickle interval is still enforced. FN9252.2 July 28, 2010 ISL9205 Indications Stability Consideration 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. 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 1µF to 200µF, with or without a battery connected. Charger Disable Input Bypass Capacitor 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. 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 1Ω series resistor must be used, as shown in the “Typical Applications” on page 3, to provide adequate damping. Remote Battery Voltage Sensing In the ISL9205 and 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. Applications Information PCB Layout Guidance The ISL9205 uses a thermally-enhanced QFN/DFN packages 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. 11 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 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. When VBAT drops below the recharge threshold, the STATUS pin will turn to logic low to indicate charging again. FN9252.2 July 28, 2010 ISL9205 PWR OFF CHARGER: OFF STATUS: OFF FAULT: OFF V IN > V POR NOT ENABLED POR CHARGER: OFF STATUS: OFF FAULT: OFF CHARGER DISABLED CHARGER: OFF STATUS: OFF FAULT: OFF ANYTIME EN PIN CHANGES TO DISABLE ENABLED TEMP FAULT REMOVED TRICKLE CHARGE CHARGER: ON STATUS: OFF FAULT: ON DISABLE STATUS: OFF FAULT: ON V BAT DROPS BELOW VMIN TIMEOUT FAULT) TIMEOUT CHARGER: OFF STATUS: ON FAULT: OFF TEMP FAULT CHARGER: OFF ANYTIME A TEMP FAULT OCCURS (EXCEPT IN VBAT < V MIN WHEN 1/8 TIMEOUT COMPLETES VBAT> VMIN BEFORE 1/8 TIMEOUT COMPLETES FAST CHARGE TO CHARGER DISABLED BLOCK CHARGER: ON TIMEOUT STATUS: ON FAULT: OFF V BAT > VRCH and I CHG< I MIN CHARGE COMPLETE VBAT < V RCH CHARGER: ON STATUS: OFF FAULT: OFF FIGURE 14. STATE MACHINE DIAGRAM 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 12 FN9252.2 July 28, 2010 ISL9205 Package Outline Drawing L16.3x3B 16 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 1, 4/07 4X 1.5 3.00 12X 0.50 A B 6 PIN 1 INDEX AREA 6 PIN #1 INDEX AREA 16 13 12 3.00 1 1 .70 4 9 (4X) + 0.10 - 0.15 0.15 5 8 0.10 M C A B + 0.07 TOP VIEW 4 16X 0.23 - 0.05 16X 0.40 ± 0.10 BOTTOM VIEW SEE DETAIL "X" 0.10 C 0 . 90 ± 0.1 C BASE PLANE SEATING PLANE 0.08 C ( 2. 80 TYP ) ( SIDE VIEW 1. 70 ) ( 12X 0 . 5 ) ( 16X 0 . 23 ) C 0 . 2 REF 5 0 . 00 MIN. 0 . 05 MAX. ( 16X 0 . 60) TYPICAL RECOMMENDED LAND PATTERN DETAIL "X" NOTES: 1. Dimensions are in millimeters. Dimensions in ( ) for Reference Only. 2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994. 3. Unless otherwise specified, tolerance : Decimal ± 0.05 4. Dimension b applies to the metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. 5. Tiebar shown (if present) is a non-functional feature. 6. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 indentifier may be either a mold or mark feature. 13 FN9252.2 July 28, 2010 ISL9205 Package Outline Drawing L10.3x3 10 LEAD DUAL FLAT PACKAGE (DFN) Rev 6, 09/09 3.00 6 PIN #1 INDEX AREA A B 1 6 PIN 1 INDEX AREA (4X) 3.00 2.00 8x 0.50 2 10 x 0.23 4 0.10 1.60 TOP VIEW 10x 0.35 BOTTOM VIEW 4 (4X) 0.10 M C A B 0.415 PACKAGE OUTLINE 0.200 0.23 0.35 (10 x 0.55) SEE DETAIL "X" (10x 0.23) 1.00 MAX 0.10 C BASE PLANE 2.00 0.20 C SEATING PLANE 0.08 C SIDE VIEW (8x 0.50) C 0.20 REF 5 1.60 0.05 TYPICAL RECOMMENDED LAND PATTERN DETAIL "X" NOTES: 1. Dimensions are in millimeters. Dimensions in ( ) for Reference Only. 2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994. 3. Unless otherwise specified, tolerance : Decimal ± 0.05 4. Lead width applies to the metallized terminal and is measured between 0.18mm and 0.30mm from the terminal tip. 5. Tiebar shown (if present) is a non-functional feature. 6. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 indentifier may be either a mold or mark feature. 14 FN9252.2 July 28, 2010