LM3658 www.ti.com SNVS328E – MAY 2005 – REVISED MARCH 2007 LM3658 Dual Source USB/AC Li Chemistry Charger IC for Portable Applications Check for Samples: LM3658 FEATURES DESCRIPTION • The LM3658 is a single chip charger IC designed for handheld applications. It can safely charge and maintain a single cell Li-Ion/Polymer battery operating from an AC wall adapter or USB power source. Input power source selection of USB/AC is automatic. With both power sources present, the AC power source has priority. Charge current is programmed through an external resistor when operating from an AC wall adapter allowing charge currents from 50 mA to 1000 mA. When the battery is charged using USB power, charge currents of 100 mA or 500 mA are pinselectable. The termination voltage is controlled to within ±0.35% of 4.2V. 1 2 • • • • • • • • • • • • • Integrated Power FETs with Thermal Regulation Charges from Either an AC Wall Adapter or USB Power Source with Automatic Source Selection 50 mA to 1000 mA Charge Currents Using AC Wall Adapter Pin-Selectable USB Charge Currents of 100 mA or 500 mA LDO Mode with 1A of Source Current is Automatically Invoked When the Battery is Absent and the AC Wall Adapter is Connected Continuous Battery Temperature Monitoring Built-in Multiple Safety Timers Charge Status Indication Continuous Over-current and Temperature Protection Near-depleted Battery Pre-conditioning Sleep Mode with Ultra Low Quiescent Current On-board Kelvin-sensing Achieves ±0.35% Termination Accuracy Maintenance Mode with Automatic Recharge Thermally Enhanced 3 mm x 3 mm WSON Package APPLICATIONS • • • • • Smartphones Digital Still Cameras PDAs Hard Drive and Flash-based MP3 Players USB-powered Devices The LM3658 requires few external components and integrates internal power FETs, reverse current protection and current sensing. The internal power FETs are thermally regulated to obtain the most efficient charging rate for a given ambient temperature. The LM3658 operates in five modes: pre-qualification mode, constant-current mode, constant-voltage mode, top-off mode and maintenance mode. Additionally, the charger IC operates as a linear regulator in “LDO mode”, when the AC wall adapter is connected and no battery is present. Optimal battery management is obtained through thermal regulation, battery temperature measurement and multiple safety timers. The LM3658 provides two open-drain outputs for LED status indication or connection to GPIOs. Typical Application CHG_IN 4.5V to 6V 1 BATT 10 1 PF USBpwr 4.5V to 6V 1 PF + Battery Pack 2 1 PF LM3658 9 Ts Iset GND USB_sel EN_b 3 8 4 7 5 6 Stat1 Stat2 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2005–2007, Texas Instruments Incorporated LM3658 SNVS328E – MAY 2005 – REVISED MARCH 2007 www.ti.com Connection Diagram and Package Mark Information 1 2 3 4 Die-Attach Pad (DAP) GND 5 10 10 9 9 1 2 8 8 Die-Attach Pad (DAP) 7 7 GND 6 6 Top View 3 4 5 Bottom View Figure 1. WSON10 Package Drawing Pin Descriptions Pin # Name Description 1 CHG_IN AC wall adapter input pin. 2 USBpwr USB power input pin. 3 GND Power and signal ground pin. 4 USB_sel Pulling this pin low limits the USB charge current to 100 mA. Pulling this pin high limits the USB charge current to 500 mA. 5 EN_b Pulling this pin low enables the charger. Pulling this pin high disables the charger. 6 STAT2 Active low open-drain output. Indicates charger status. This pin is capable of driving an LED as well as GPIOs. See Operation Description section for more detail. 7 STAT1 Active low open-drain output. Indicates charger status. This pin is capable of driving an LED as well as GPIO. See Operation Description section for more detail. 8 ISET A resistor is connected between this pin and GND. The resistor value determines the full-rate charge current when using the AC source. 9 TS Battery temperature sense pin. This pin must be connected to battery pack’s temperature sense output pin. For the LM3658SD-B version, leaving this pin open indicates that the battery pack is not present. The charger IC will invoke LDO mode if this pin is left floating. See Operation Description section for more detail. 10 BATT Positive battery terminal connection. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ABSOLUTE MAXIMUM RATINGS (1) (2) (3) −0.3V to +6.5V CHG_IN, USBpwr (VCC) −0.3V to CHG_IN or USBpwr All other pins except GND Power Dissipation (4) Internally Limited Junction Temperature (TJ-MAX) +150°C −65°C to +150°C Storage Temperature Range ESD Rating (5) Human Body Model: Machine Model: (1) (2) (3) (4) (5) 2 2.0 kV 200V All voltages are with respect to the potential at the GND pin. Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of the device is specified. Operating Ratings do not imply specified performance limits. For specified performance limits and associated test conditions, see the Electrical Characteristics tables. If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. The LM3658 has built-in thermal regulation to regulate the die temperature to 120ºC. See Operation Description section for more detail. The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin. MIL-STD-883 3015.7 Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 LM3658 www.ti.com SNVS328E – MAY 2005 – REVISED MARCH 2007 OPERATING RATINGS (1) (2) Input Voltage Range for CHG_IN 4.5V to 6.0V Input Voltage Range for USB_pwr 4.35V to 6.0V Recommended Load Current 0 to 1000 mA Power Dissipation (3) Internally Limited Junction Temperature (TJ) Range −40°C to +125°C Ambient Temperature (TA) Range −40°C to +85°C (1) (2) (3) Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of the device is specified. Operating Ratings do not imply specified performance limits. For specified performance limits and associated test conditions, see the Electrical Characteristics tables. All voltages are with respect to the potential at the GND pin. The LM3658 has built-in thermal regulation to regulate the die temperature to 120ºC. See Operation Description section for more detail. THERMAL PROPERTIES θJA, Junction-to-Ambient Thermal Resistance (1) (1) 54°C/W Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power dissipation exists, special care must be paid to thermal dissipation issues in board design. Please refer to application note AN-1187 (SNOA401) for more detail. ELECTRICAL CHARACTERISTICS Unless otherwise noted, VCC (VCHG_IN and/or VUSBpwr) = 5V, VBATT = 3.5V. CCHG_IN = 1 µF, CUSBpwr = 1 µF, CBATT = 1 µF. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over TJ = 0°C to +85°C. (1) (2) (3) Symbol Parameter Conditions Min Typ Max Units CHARGER VCHG_IN AC Wall Adapter Input Voltage Range 4.5 6.0 V VUSBpwr USB Input Voltage Range 4.35 6.0 V ICC_PD Quiescent Current in Power Down Mode VBATT > VCC–VOK_CHG 1 5 µA ICC_STBY Quiescent Current in Standby Mode VBATT < VCC − VOK_CHG VCC > VPOR EN_b = High 400 600 µA IBATT_PD Battery Leakage Current in Power Down Mode VBATT > VCC + VOK_CHG 0.01 2.0 µA IBATT_MAI Battery Leakage Current in Maintenance Mode STAT1 = off, STAT2 = on, adapter or USB connected, VBATT = 4.2V 7 15 µA VOK_CHG CHG_IN or USBpwr OK TripPoint VCC – VBATT (Rising) VCC – VBATT (Falling) 200 50 mV VPOR VCC POR Trip-Point VCC (Rising) VBATT < VCC – VOK_CHG VFULL_RATE < VBATT < VTERM 3.0 V Battery Charge Termination Voltage ICHG = 10% of its value when VBATT = 3.5V 4.2 V Battery Charge Termination Voltage Tolerance TA = 25°C −0.35 +0.35 TA = 0°C to 85°C −1.5 +1.5 VCHG_DO CHG_IN Drop-Out Voltage VBATT = VTERM, ICHG = 1A VCC > VBATT + VCHG_DO_MAX 500 mV VUSB_DO USBpwr Drop-Out Voltage VBATT = VTERM, USB_sel = high VCC > VBATT + VUSB_DO_MAX 250 mV NT VTERM (1) (2) (3) % All voltages are with respect to the potential at the GND pin. Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not specified, but do represent the most likely norm. LM3658 is not intended as a Li-Ion battery protection device; battery used in this application should have an adequate internal protection. Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 3 LM3658 SNVS328E – MAY 2005 – REVISED MARCH 2007 www.ti.com ELECTRICAL CHARACTERISTICS (continued) Unless otherwise noted, VCC (VCHG_IN and/or VUSBpwr) = 5V, VBATT = 3.5V. CCHG_IN = 1 µF, CUSBpwr = 1 µF, CBATT = 1 µF. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over TJ = 0°C to +85°C. (1)(2)(3) Symbol ICHG ICHG KISET VISET Parameter Conditions Min Typ Max Units 1000 mA CHG_IN Full-Rate Charge Current Range (see full-rate charge mode description) 6V ≥ VCC ≥ 4.5V VBATT < VCC – VOK_CHG VFULL_RATE < VBATT < VTERM ICHG = KISET/RISET 50 CHG_IN Full Rate Charge Current RISET = 10kΩ 220 245 270 RISET = 5 kΩ 465 500 535 RISET = 3.3kΩ 700 760 820 mA Charge Current Set Coefficient ICHG = KISET/RISET (see full-rate charge mode description) 6V ≥ VCC ≥ 4.5V VBATT < VCC – VOK_CHG VFULL_RATE < VBATT < VTERM 2500 AΩ Charge Current Set Voltage 6V ≥ VCC ≥ 4.5V VBATT < VCC – VOK_CHG VFULL_RATE < VBATT < VTERM 2.5 V IUSB_L USB Full-Rate Charge Low Current 80 90 100 mA IUSB_H USB Full-Rate Charge High Current 400 450 500 mA IPREQUAL Pre-Qualification Current VBATT = 2V, for both AC adapter and USB 35 45 55 mA VFULL_RA Full-Rate Qualification Threshold VBATT rising, transition from pre-qualification to fullrate charging 2.9 3.0 3.1 V Full Rate Hysteresis VBATT falling 50 60 70 mV 7 9 11 % 6V ≥ VCC ≥ 4.5V VBATT < VCC – VOK_CHG VBATT = VTERM 1.25 2.5 3.75 % VBATT falling, transition from EOC to prequalification mode 3.94 4.0 4.07 V Battery Temperature Sense Comparator Low-Voltage Threshold 0.46 0.49 0.52 V Battery Temperature Sense Comparator High-Voltage Threshold 2.44 2.49 2.54 V ITSENSE Battery Temperature Sense Current 94 100 106 µA TREG Regulated Junction Temperature 120 °C TSD Thermal Shutdown Temperature 165 °C VTLDO LDO mode detection threshold TS pin voltage for entry into LDO mode. For LM3658SD-B only 3.95 4.0 v VLDO LDO Mode Regulation 6V ≥ VCHG_IN ≥ 4.5V TS= Floating IBATT = 100mA -3.0 4.2 +3.0 40 60 100 ms 27 30 33 mins Deglitch Time for PreQualification to Full-Rate Charge Transition 270 300 330 ms Deglitch Time for Full-Rate to Pre-Qualification Transition 270 300 330 ms TE End-of-Charge Current, Percent 6V ≥ VCC ≥ 4.5V from Full-Range Current VBATT < VCC – VOK_CHG VFULL_RATE < VBATT < VTERM IEOC ITOPOFF Minimum Top-Off Charge Current VRESTART Restart Threshold Voltage VTL VTH % DETECTION AND TIMING TPOK Power OK Deglitch Time VBATT < VCC – VOK_CHG TPREQUAL Pre-Qualification Timer TPQ_FULL TFULL_PQ 4 Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 LM3658 www.ti.com SNVS328E – MAY 2005 – REVISED MARCH 2007 ELECTRICAL CHARACTERISTICS (continued) Unless otherwise noted, VCC (VCHG_IN and/or VUSBpwr) = 5V, VBATT = 3.5V. CCHG_IN = 1 µF, CUSBpwr = 1 µF, CBATT = 1 µF. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over TJ = 0°C to +85°C. (1)(2)(3) Symbol Min Typ Max LM3658SD, LM3658SD-B and LM3658SD-A with USB_sel=high 270 300 330 LM3658SD-A with USB_sel=low 540 600 660 Deglitch Time for End-ofCharge Transition 270 300 330 ms TBATTEMP Deglitch Time for Battery Temperature Fault 20 40 80 ms TDGL Deglitch Time for EN_b and USB_sel Pins 20 40 80 ms TITOPOFF Deglitch Time for ITOPOFF ms TTOPOFF Top-Off Charging Timer TCHG TEOC Parameter Charge Timer Conditions 270 300 330 LM3658SD, LM3658SD-B and LM3658SD-A with USB_sel=high 27 30 33 LM3658SD-A with USB_sel=low 54 60 66 EN_b 0 Units mins mins I/O VIL Low-Level Input Voltage 0.7 USB_sel VIH High-Level Input Voltage V 1.5 EN_b 1.4 USB_sel 2.5 10 IOL Low-Level Output Current STAT1, STAT2, output voltage = 0.25V IOH High-Level Output Current STAT1, STAT2, output voltage = 6.0V V 25 0.01 mA 1 Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 µA 5 LM3658 SNVS328E – MAY 2005 – REVISED MARCH 2007 www.ti.com BLOCK DIAGRAM Body Switcher CHG_IN BATT Power Supply Body Switcher Ts USBpwr Voltage Current References Setting and Thermo Block Iset Sensor Current/Voltage GND Control Loop with Voltage/Current Limits LDO_on + USB_sel + BATT BATT TEMP STAT1 STAT2 + + EN_b 6 + VTERM Logic and Timers Iset + VFULL_RATE + VEOC VRESTART Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 LM3658 www.ti.com SNVS328E – MAY 2005 – REVISED MARCH 2007 Li-Ion Charging Profile 1C 1C Battery Voltage/Battery Current Battery Voltage 4.2V 4.0V Battery Current 3.0V 0.1C 50 mA 0.025C Time Prequalification Constant Current TPREQUAL STAT1 STAT2 Maintenance Constant Current Constant Voltage TCHG ON OFF TTOPOFF TCHG OFF ON ON OFF Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 7 LM3658 SNVS328E – MAY 2005 – REVISED MARCH 2007 www.ti.com LM3658 OPERATION DESCRIPTION POWER-DOWN MODE The LM3658 will power down automatically when the voltage on the USBpwr or CHG_IN pin drops below the battery voltage with an amount that is equal to VOK_CHG (VBATT > VCC - VOK_CHG). Power-Down mode shuts off the internal power FETs as well as the open-drain pull-down transistors on the status pins STAT1 and STAT2. The only current consumed by the LM3658 is an ultra-low quiescent current of 1 µA typical. POWER-ON RESET As soon as the voltage of one of the power sources rises above VBATT + VOK_CHG, the charger will wake up. However, charging will not be initiated unless the supply voltage source exceeds the VPOR. AUTOMATIC POWER SOURCE DETECTION When the voltage of one of the power sources exceeds the VPOR threshold, the LM3658 detects which power source is a valid charge supply. When both supply voltages are valid and present, CHG_IN will automatically be selected over USBpwr. The USBpwr will be the designated power source only if no CHG_IN is present or when the voltage on the CHG_IN pin is less than the battery voltage. THERMAL POWER FET REGULATION The internal power FETs are thermally regulated to the junction temperature of 120ºC to specify optimal charging of the battery. At all times is the charge current limited by the ISET resistor setting, the USB 100 mA/500 mA selection, or the 100ºC junction temperature of the LM3658. The charge current is therefore a function of the charge current settings, the thermal conductivity of the package and the ambient temperature as described in the following equation: 120°C - T A KISET ] ICHG = min [ or USB_sel or RISET TJA(VCC - VBATT) Where TA is the ambient temperature and θJA is the thermal resistance of the package. Thermal regulation specifies maximum charge current and superior charge rate without exceeding the power dissipation limits of the LM3658. PRE-QUALIFICATION MODE During pre-qualification, STAT1 is on and STAT2 is off, and the charger supplies a constant current of 50 mA to the battery. When the battery voltage reaches VFULL_RATE, the charger transitions from pre-qualification to full-rate charging. The pre-qualification mode aborts when the battery doesn’t reach VFULL_RATE within the time allowed in TPREQUAL timer. In this event, charging stops and STAT1 and STAT2 will both be on, indicating a bad battery condition. CHG_IN FULL-RATE CHARGING MODE The full-rate charge cycle is initiated following the successful completion of the pre-qualification mode. Timer TCHG starts to count when the charger enters full-rate charging, with STAT1 on and STAT2 off. When charging with an AC wall adapter, the full-rate charge current is proportional to the value of the resistor that is connected to the ISET pin as described in the following equation: KISET ICHG = RISET It is recommended to charge Li-Ion batteries at 1C rate, where “C” is the capacity of the battery. As an example, it is recommended to charge a 750 mAh battery at 750 mA, or 1C. Charging at a higher rate can cause damage to the battery. 8 Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 LM3658 www.ti.com SNVS328E – MAY 2005 – REVISED MARCH 2007 USBpwr FULL-RATE CHARGING MODE The full-rate charge cycle is initiated following the successful completion of the pre-qualification mode. Timer TCHG starts to count when the charger enters full-rate charging, with STAT1 on and STAT2 off. If the USB bus provides the charger supply, then the default full-rate charge current is 100 mA max unless the USB_sel pin is pulled high, which sets the charge current to 500 mA max. CONSTANT-VOLTAGE CHARGING MODE AND END-OF-CHARGE (EOC) DETECTION The battery voltage increases rapidly as a result of full-rate charging and will reach the 4.2V termination voltage, triggering the constant-voltage charge cycle. Timer TCHG continues to count in this cycle. STAT1 is on and STAT2 is off. The charge current gradually decreases during constant-voltage charging until it reaches the EndOf-Charge (EOC), which is equal to 10% of the full-rate current set either by the resistor connected to the ISET pin or the USB_sel pin. If Timer TCHG times out before EOC is reached, charging stops and STAT1 and STAT2 will both be on, indicating a bad battery condition. TOP-OFF CHARGING MODE Once EOC has been reached, a top-off cycle continues to charge the battery. Timed top-off cycle provides optimal battery capacity following a complete charge cycle. During this cycle, charging terminates when ICHG reaches 2.5% of the full-rate charge current or when TTOPOFF times out, whichever occurs first. STAT1 will turn off and STAT2 will turn on once the top-off cycle completes successfully, indicating that charging is done. MAINTENANCE MODE Maintenance mode begins immediately after the charger successfully finishes the top-off cycle. In the maintenance mode, the battery voltage is being monitored by the LM3658 continuously. If the battery voltage drops 200 mV below VTERM, a new full-rate charge cycle starts to replenish the battery. As this new full-rate charge cycle begins, STAT1 will turn on and STAT2 will turn off, and all the timers will reset. Refer to the LM3658 Flowchart. CHARGE STATUS OUTPUTS The LM3658 provides two open-drain outputs STAT1 and STAT2 that can be connected to external LEDs or to General Purpose I/O’s (GPIO) of a peripheral IC. All charge status of the LM3658 is illustrated in Table 1. “ON” means that STATx pin is pulled low as its pull-down transistor is turned on, representing a logic 0. Table 1. Status Pins Summary STAT1 STAT2 Condition OFF OFF Power-Down, charging is suspended or interrupted ON OFF Pre-qualification mode, CC and CV charging, Top-off mode OFF ON Charge is completed ON ON Bad battery (Safety timer expired), or LDO mode SAFETY TIMERS In order to prevent endless charging of the battery, which can cause damage to the battery, there are three safety timers that forcefully terminate charging if the charging mode is not completed within the time allowed. Pre-Qualification Timer (TPREQUAL) The pre-qualification timer starts with the initiation of the pre-qualification mode and allows 30 minutes to transition from pre-qualification to full rate charging. If the battery voltage does not reach VFULL_RATE in 30 minutes, charging stops and status pins STAT1 and STAT2 both turn on to indicate a bad battery status. Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 9 LM3658 SNVS328E – MAY 2005 – REVISED MARCH 2007 www.ti.com Charger Timer (TCHG) The charge timer starts with the initiation of full-rate charging and has a duration of 5 hours for the LM3658. If the charge current does not reach EOC, charging stops and STAT1 and STAT2 both turn on to indicate a bad battery status. Once the charge control declares a bad battery, removing the input source is the only means to clear the bad battery status. Top-Off Timer (TTOPOFF) Once the charger successfully completes constant current constant voltage charging, it enters top-off mode and starts TTOPOFF timer. Topoff lasts 30 minutes for the LM3658. During top-off, charging stops when TTOPOFF reaches its count or when ICHG reaches 2.5% of the full-rate charge current. There is no time-out condition in topoff mode. When charging is interrupted either by battery temperature out of range or disabling the LM3658, the applicable safety timer will store its count value for the duration of the interruption and subsequently resumes counting from its stored count value when charging continues, only if the charger resumes to the same operation mode it was in before the interrupt. The LM3658SD-A version has selectable timers for TCHG and TTOPOFF. Based on the logic level applied to the USB_sel pin, timers can be chosen as follow: Input USB_SEL TPREQUAL TCHG TTOPOFF CHG_IN Low 30 minutes 10 hours 60 minutes CHG_IN High 30 minutes 5 hours 30 minutes USBpwr Low 30 minutes 10 hours 60 minutes USBpwr High 30 minutes 5 hours 30 minutes BATTERY TEMPERATURE MONITORING (SUSPEND MODE) The LM3658 is equipped with a battery thermistor interface to continuously monitor the battery temperature by measuring the voltage between the TS pin and ground. Charging is allowed only if the battery temperature is within the acceptable temperature range set by a pair of internal comparators inside the LM3658. If the battery temperature is out of range, STAT1 and STAT2 both turn off and charging is suspended. Timer holds its count value. The TS pin is only active during charging and draws no current from the battery when no external power source is present. If the TS pin is not used in the application, it should be connected to GND through 10kΩ pulldown resistor. When the TS pin is left floating (battery removal), then the charger will be disabled as the TS voltage exceeds the upper temperature limit. Ts ntc + Logic charger control + - hiRef loRef The LM3658 battery temperature feature is tailored to use negative temperature coefficient (NTC) 103AT thermistors with 10kΩ impedance. If alternative thermistors need to be used in the system, supplemental external resistors are needed to create a circuit with equivalent impedance. 10 Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 LM3658 www.ti.com SNVS328E – MAY 2005 – REVISED MARCH 2007 Ts R2 + Logic charger control + - R1 ntc hiRef loRef DISABLING CHARGER (CHARGE INTERRUPT MODE) Charging can be safely interrupted by pulling the EN_b pin high and charging can resume upon pulling the EN_b pin low. The enable pin can be permanently tied to GND with no extra current consumption penalty during power down mode. When the charger is disabled, timer holds its count value, and STAT1 and STAT2 are both off. LDO MODE (AVAILABLE ONLY IN LM3658SD-B VERSION) The LM3658SD-B version enters LDO mode when the Ts pin is floating and AC wall adapter is still connected to CHG_IN pin. In LDO mode, STAT1 and STAT2 are both on. The LM3658SD-B becomes a linear regulator capable of delivering 1A of source current. Normally the Ts pin is connected to the thermistor from the battery pack for temperature monitoring purpose. If this pin is disconnected, the LM3658SD-B assumes that there is no battery present and will automatically invoke the LDO mode. LDO mode allows applications to operate without a battery provided that the AC wall adapter supplies power to the CHG_IN pin. The LDO mode is not possible in USB mode. For the other versions of the LM3658, floating the Ts pin does not invoke LDO mode. Instead, it will go to suspend mode. Please refer to “ Battery Temperature Monitoring” section for more detail. 5 HOUR/ 10 HOUR SELECTABLE TIMER (AVAILABLE ONLY IN LM3658SD-A VERSION) The LM3658SD-A allows the user to select between 5 hour or 10 hour timer based on the polarity of the USB_sel pin, in both CHG_IN mode and USBpwr mode. By pulling the USB_sel pin high, the timer is set to 5 hours. In the USBpwr mode, the polarity of the USB_sel pin determines the charge current as well as the timer. In CHG_IN mode, the polarity of the USB_sel pin determines only the timer. The charge current is set by the resistor at Iset pin. INPUT/OUTPUT BYPASS CAPACITORS Care should be taken to support the stability of the charge system by connecting a 1 µF capacitor as close as possible to the BATT pin. An input capacitor ranging from 1.0 µF– 10.0 µF must be connected to the CHG_IN and USBpwr input pins. Low cost ceramic capacitors can be selected. THERMAL PERFORMANCE OF THE WSON PACKAGE The LM3658 is a monolithic device with integrated power FETs. For that reason, it is important to pay special attention to the thermal impedance of the WSON package and to the PCB layout rules in order to maximize power dissipation of the WSON package. The WSON package is designed for enhanced thermal performance and features an exposed die attach pad at the bottom center of the package that creates a direct path to the PCB for maximum power dissipation. Compared to the traditional leaded packages where the die attach pad is embedded inside the molding compound, the WSON reduces one layer in the thermal path. Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 11 LM3658 SNVS328E – MAY 2005 – REVISED MARCH 2007 www.ti.com The thermal advantage of the WSON package is fully realized only when the exposed die attach pad is soldered down to a thermal land on the PCB board with thermal vias planted underneath the thermal land. Based on thermal analysis of the WSON package, the junction-to-ambient thermal resistance (θJA) can be improved by a factor of two when the die attach pad of the WSON package is soldered directly onto the PCB with thermal land and thermal vias, as opposed to an alternative with no direct soldering to a thermal land. Typical pitch and outer diameter for thermal vias are 1.27 mm and 0.33 mm respectively. Typical copper via barrel plating is 1 oz, although thicker copper may be used to further improve thermal performance. The LM3658 die attach pad is connected to the substrate of the IC and therefore, the thermal land and vias on the PCB board need to be connected to ground (GND pin). For more information on board layout techniques, refer to Application Note 1187 (SNOA401) “Leadless Lead Frame Package (LLP).” This application note also discusses package handling, solder stencil and the assembly process. 12 Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 LM3658 www.ti.com SNVS328E – MAY 2005 – REVISED MARCH 2007 LM3658 FLOWCHARTS LDO mode From any mode (except POR & power down) If Ts pin is floating, LM3658 goes to the LDO mode after 300 msec deglitch Powerdown Mode No VCC > VBATT + VOK Yes Yes Ts pin Is floating Yes Suspend Mode From any mode except POR and Powerdown If Ts pin is not in desired range, LM3658 enters Suspend mode. Timer stops. Ts pin out of window No No POR Mode Yes VCC > VPOR Yes Yes CHG_IN present No USBpwr present Yes Charge Interrupt Mode Timer stops CHG_IN Mode No En_b low USBpwr Mode Yes Bad Battery Mode Disconnect power Source to restart Charger. Maintenance Mode No VBATT < VRESTART Yes Figure 2. LM3658 Flowchart Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 13 LM3658 SNVS328E – MAY 2005 – REVISED MARCH 2007 www.ti.com USBpwr CCCV Mode CHG_IN present Topoff Mode Yes CHG_IN present Go to POR USB_SEL is High Prequalification Mode CHG_IN present Yes Go to POR No Set Ichg = 100 mA Yes Yes Go to Bad Battery Mode TCHG expire No No VBATT t VFULL_RATE Yes Go to Charger Interrupt Mode Yes Go to Bad Battery Mode En_b High VBATT < VRESTART No VBATT < VFULL_RATE IEOC detected Yes Go to Charger Interrupt Mode Yes Go to POR No TTOPOFF expire No Yes Set Ichg = 500 mA No No Yes Yes Maintenance Mode No Go to Charger Interrupt Mode No TPREQUAL expire USB_SEL is High Set Ichg = 500 mA No No En_b High Yes Set Ichg=100 mA En_b High Go to POR No No USBpwr Mode Yes No Yes No ICHG < ITOPOFF Figure 3. LM3658 USBpwr Mode Flowchart CHG_IN Mode CHG_IN Prequalification Mode En_b High CHG_IN Yes Go to Charger Interrupt Mode Yes Go to Bad Battery Mode En_b High No TPREQUAL expire Yes Go to Charger Interrupt Mode Yes Go to Bad Battery Mode En_b High No TCHG expire VBATT t VFULL_RATE Yes VBATT < VRESTART VBATT < VFULL_RATE IEOC Yes Go to Charger Interrupt Mode Yes Go to POR No TTOPOFF expire No No Maintenance Mode No No No No Topoff Mode CCCV Mode No Yes No detected ICHG < ITOPOFF Figure 4. LM3658 CHG_IN Mode Flowchart 14 Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Links: LM3658 PACKAGE OPTION ADDENDUM www.ti.com 9-Mar-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Qty Drawing Eco Plan Lead/Ball Finish (2) MSL Peak Temp Op Temp (°C) Top-Side Markings (3) (4) LM3658SD ACTIVE WSON DSC 10 1000 TBD Call TI Call TI -40 to 85 L111B LM3658SD-A/NOPB ACTIVE WSON DSC 10 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 L155B LM3658SD-B ACTIVE WSON DSC 10 1000 TBD Call TI Call TI -40 to 85 L156B LM3658SD-B/NOPB ACTIVE WSON DSC 10 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 L156B LM3658SD/NOPB ACTIVE WSON DSC 10 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 L111B LM3658SDX ACTIVE WSON DSC 10 4500 TBD Call TI Call TI -40 to 85 L111B LM3658SDX-A ACTIVE WSON DSC 10 4500 TBD Call TI Call TI -40 to 85 L155B LM3658SDX-A/NOPB ACTIVE WSON DSC 10 4500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 L155B LM3658SDX-B ACTIVE WSON DSC 10 4500 TBD Call TI Call TI -40 to 85 L156B LM3658SDX-B/NOPB ACTIVE WSON DSC 10 4500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 L156B LM3658SDX/NOPB ACTIVE WSON DSC 10 4500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 L111B (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 9-Mar-2013 Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) Only one of markings shown within the brackets will appear on the physical device. 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Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 14-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM3658SD WSON DSC 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM3658SD-A/NOPB WSON DSC 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM3658SD-B WSON DSC 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM3658SD-B/NOPB WSON DSC 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM3658SD/NOPB WSON DSC 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM3658SDX WSON DSC 10 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM3658SDX-A WSON DSC 10 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM3658SDX-A/NOPB WSON DSC 10 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM3658SDX-B WSON DSC 10 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM3658SDX-B/NOPB WSON DSC 10 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM3658SDX/NOPB WSON DSC 10 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 14-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM3658SD WSON DSC 10 1000 203.0 190.0 41.0 LM3658SD-A/NOPB WSON DSC 10 1000 203.0 190.0 41.0 LM3658SD-B WSON DSC 10 1000 203.0 190.0 41.0 LM3658SD-B/NOPB WSON DSC 10 1000 203.0 190.0 41.0 LM3658SD/NOPB WSON DSC 10 1000 203.0 190.0 41.0 LM3658SDX WSON DSC 10 4500 349.0 337.0 45.0 LM3658SDX-A WSON DSC 10 4500 349.0 337.0 45.0 LM3658SDX-A/NOPB WSON DSC 10 4500 349.0 337.0 45.0 LM3658SDX-B WSON DSC 10 4500 349.0 337.0 45.0 LM3658SDX-B/NOPB WSON DSC 10 4500 349.0 337.0 45.0 LM3658SDX/NOPB WSON DSC 10 4500 349.0 337.0 45.0 Pack Materials-Page 2 MECHANICAL DATA DSC0010A SDA10A (Rev A) www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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