LM3658 Dual Source USB/AC Li Chemistry Charger IC for Portable Applications General Description Features 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 pin-selectable. The termination voltage is controlled to within 0.35% of 4.2V. 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. 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 LLP package Applications Smartphones Digital still cameras PDAs Hard Drive and flash-based MP3 players USB-powered devices Typical Application 20128201 (c) 2007 National Semiconductor Corporation 201282 www.national.com LM3658 Dual Source USB/AC Li Chemistry Charger IC for Portable Applications November 2006 LM3658 Connection Diagram and Package Mark Information LLP10 Package Drawing 20128202 Note: The actual physical placement of the package marking will vary from part to part. The package marking "X" is the manufacturing plant code. "YY" is a 2digit date code, and "ZZ" for die traceability. These codes will vary considerably. "L111B" identifies the device (part number, option, etc.). 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. Ordering Information Order Number 5 Hour Timer Selectable Timer LDO Mode No LDO Mode Package Marking Supplied As LM3658SD X X L111B 1000 units, Tape-and-Reel LM3658SDX X X L111B 4500 units, Tape-and-Reel LM3658SD-A X X L155B 1000 units, Tape-and-Reel LM3658SDX-A X X L155B 4500 units, Tape-and-Reel LM3658SD-B X X L156B 1000 units, Tape-and-Reel LM3658SDX-B X X L156B 4500 units, Tape-and-Reel For more information on the various options, please refer to Operation Description section. www.national.com 2 If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. CHG_IN, USBpwr (VCC) All other pins except GND Power Dissipation (Note 3) Junction Temperature (TJ-MAX) -65C to +150C 2.0 kV 200V Operating Ratings -0.3V to +6.5V -0.3V to CHG_IN or USBpwr Internally Limited +150C (Notes 1, 2) Input Voltage Range for CHG_IN Input Voltage Range for USB_pwr Recommended Load Current Power Dissipation(Note 3) Junction Temperature (TJ) Range Ambient Temperature (TA) Range 4.5V to 6.0V 4.35V to 6.0V 0 to 1000 mA Internally Limited -40C to +125C -40C to +85C Thermal Properties JA, Junction-to-Ambient Thermal 54C/W Resistance (Note 5) Electrical Characteristics Unless otherwise noted, VCC (VCHG_IN and/or VUSBpwr) = 5V, VBATT = 3.5V. CCHG_IN = 1 F, CUSBpwr = 1 F, CBATT = 1 F. Typical values and limits appearing in normal type apply for TJ = 25C. Limits appearing in boldface type apply over TJ = 0C to +85C. (Notes 2, 6, 7) 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 A ICC_STBY Quiescent Current in Standby Mode VBATT < VCC - VOK_CHG VCC > VPOR EN_b = High 400 600 A Battery Leakage VBATT > VCC + VOK_CHG Current in Power Down Mode 0.01 2.0 A 7 15 A IBATT_PD IBATT_MAINT Battery Leakage STAT1 = off, STAT2 = on, adapter or USB Current in Maintenance connected, VBATT = 4.2V Mode VOK_CHG CHG_IN or USBpwr OK Trip-Point 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 4.2 V VTERM Battery Charge Termination Voltage ICHG = 10% of its value when VBATT = 3.5V Battery Charge Termination Voltage Tolerance TA = 25C -0.35 +0.35 TA = 0C to 85C -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 ICHG 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 3 % 1000 mA www.national.com LM3658 Storage Temperature Range ESD Rating (Note 4) Human Body Model: Machine Model: Absolute Maximum Ratings (Notes 1, 2) LM3658 Symbol ICHG KISET VISET Parameter CHG_IN Full Rate Charge Current Conditions Min Typ Max RISET = 10k 220 245 270 RISET = 5 k 465 500 535 RISET = 3.3k 700 760 820 Charge Current Set 6V VCC 4.5V Coefficient VBATT < VCC - VOK_CHG ICHG = KISET/RISET (see V FULL_RATE < VBATT < VTERM full-rate charge mode description) Charge Current Set Voltage 6V VCC 4.5V VBATT < VCC - VOK_CHG VFULL_RATE < VBATT < VTERM Units mA 2500 A 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 35 45 55 mA VFULL_RATE Full-Rate Qualification VBATT rising, transition from pre-qualification to Threshold full-rate charging 2.9 3.0 3.1 V Full Rate Hysteresis VBATT falling 50 60 70 mV End-of-Charge Current, Percent from Full-Range Current 6V VCC 4.5V VBATT < VCC - VOK_CHG VFULL_RATE < VBATT < VTERM 7 9 11 % Minimum Top-Off Charge Current 6V VCC 4.5V VBATT < VCC - VOK_CHG VBATT = VTERM 1.25 2.5 3.75 % VRESTART Restart Threshold Voltage VBATT falling, transition from EOC to prequalification mode 3.94 4.0 4.07 V VTL 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 A TREG Regulated Junction Temperature 120 C TSD Thermal Shutdown Temperature 165 C VTLDO LDO mode detection threshold 3.95 4.0 v VLDO LDO Mode Regulation 6V VCHG_IN 4.5V TS= Floating IBATT = 100mA -3.0 4.2 IEOC ITOPOFF VTH www.national.com VBATT = 2V, for both AC adapter and USB TS pin voltage for entry into LDO mode. For LM3658SD-B only 4 +3.0 % Parameter Conditions Min Typ Max Units 40 60 100 ms DETECTION AND TIMING TPOK Power OK Deglitch Time TPREQUAL Pre-Qualification Timer 27 30 33 mins TPQ_FULL Deglitch Time for PreQualification to FullRate Charge Transition 270 300 330 ms Deglitch Time for FullRate to PreQualification Transition 270 300 330 ms LM3658SD, LM3658SD-B and LM3658SD-A with USB_sel=high 270 300 330 LM3658SD-A with USB_sel=low 540 600 660 TFULL_PQ TCHG Charge Timer VBATT < VCC - VOK_CHG mins TEOC Deglitch Time for Endof-Charge 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 270 300 330 ms TTOPOFF Top-Off Charging Timer LM3658SD, LM3658SD-B and LM3658SD-A with USB_sel=high 27 30 33 LM3658SD-A with USB_sel=low 54 60 66 Low-Level Input Voltage EN_b 0 VIH High-Level Input Voltage EN_b 1.4 USB_sel 2.5 IOL Low-Level Output Current STAT1, STAT2, output voltage = 0.25V IOH High-Level Output Current STAT1, STAT2, output voltage = 6.0V mins I/O VIL V 0.7 USB_sel 1.5 10 V 25 0.01 mA A 1 Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: All voltages are with respect to the potential at the GND pin. Note 3: The LM3658 has built-in thermal regulation to regulate the die temperature to 120C. See Operation Description section for more detail. Note 4: The Human body model is a 100 pF capacitor discharged through a 1.5 k resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin. MIL-STD-883 3015.7 Note 5: 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 AN1187 for more detail. Note 6: Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm. Note 7: LM3658 is not intended as a Li-Ion battery protection device; battery used in this application should have an adequate internal protection. 5 www.national.com LM3658 Symbol LM3658 Block Diagram 20128203 www.national.com 6 LM3658 Li-Ion Charging Profile 20128204 7 www.national.com LM3658 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 A typical. 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. 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. 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. CONSTANT-VOLTAGE CHARGING MODE AND END-OFCHARGE (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 End-Of-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. 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 120C to guarantee 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 100C 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: 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 fullrate 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. 20128205 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. Where TA is the ambient temperature and JA is the thermal resistance of the package. Thermal regulation guarantees 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. 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. 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: www.national.com 8 STAT2 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 10k 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. 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 prequalification 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. 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. 20128210 The LM3658 battery temperature feature is tailored to use negative temperature coefficient (NTC) 103AT thermistors with 10k impedance. If alternative thermistors need to be used in the system, supplemental external resistors are needed to create a circuit with equivalent impedance. 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 top-off 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 20128211 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. TTOPOFF CHG_IN Low 30 minutes 10 hours 60 minutes CHG_IN High 30 minutes 5 hours USBpwr Low 30 minutes 10 hours 60 minutes USBpwr High 30 minutes 5 hours 30 minutes 30 minutes 9 www.national.com LM3658 TABLE 1. Status Pins Summary STAT1 LM3658 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. THERMAL PERFORMANCE OF THE LLP 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 LLP package and to the PCB layout rules in order to maximize power dissipation of the LLP package. The LLP 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 LLP reduces one layer in the thermal path. The thermal advantage of the LLP 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 LLP package, the junction-to-ambient thermal resistance (JA) can be improved by a factor of two when the die attach pad of the LLP 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 "Leadless Lead Frame Package (LLP)." This application note also discusses package handling, solder stencil and the assembly process. 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 F capacitor as close as possible to the BATT pin. An input capacitor ranging from 1.0 F- 10.0 F must be connected to the CHG_IN and USBpwr input pins. Low cost ceramic capacitors can be selected. www.national.com 10 LM3658 LM3658 FLOWCHARTS 20128207 LM3658 Flowchart 11 www.national.com LM3658 20128206 LM3658 USBpwr Mode Flowchart 20128208 LM3658 CHG_IN Mode Flowchart www.national.com 12 LM3658 Physical Dimensions inches (millimeters) unless otherwise noted LLP10 Package Drawing NS Package Number SDA10A 13 www.national.com LM3658 Dual Source USB/AC Li Chemistry Charger IC for Portable Applications Notes THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS, IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT NATIONAL'S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS. EXCEPT AS PROVIDED IN NATIONAL'S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness. National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. Copyright(c) 2007 National Semiconductor Corporation For the most current product information visit us at www.national.com National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530-85-86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +49 (0) 870 24 0 2171 Francais Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560