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| STBC08 800mA Standalone linear Li-Ion Battery charger with thermal regulation Feature summary Programmable charge current up to 800mA No external MOSFET, sense resistors or blocking diode required Complete linear charger for single cell lithiumion batteries Constant current / constant voltage operation with thermal regulation to maximize charge rate without risk of overheating Two charge status output pins Charges single cell li-ion batteries directly from USB port Preset 4.2V charge voltage with 1% accuracy Charge current monitor for gas gauging Automatic recharge Under-voltage lockout C/10 Charge termination 25A supply current in shutdown mode Low battery voltage detect for precharge setting Soft-start feature limits inrush current DFN6 (3x3mm) package (for better power dissipation) DFN6 (3x3mm) Description The STBC08 is a constant current/constant voltage charger for single cell Li-Ion batteries. No external sense resistor or blocking diode is required. The STBC08 is designed to work within USB power specifications. An internal block regulates the current when the junction temperature increases, in order to protect the device when it operates in high power or high ambient temperature conditions. The charge voltage is fixed at 4.2V, and current limitation can be programmed using a single resistor connected between PROG pin and GND. The charge cycle is automatically terminated when the current flowing to the battery is 1/10 of the programmed value. If the external adaptor is removed, the STBC08 turns off and a 2A current can flow from the battery to the device. The device can be put into Shutdown Mode, reducing the supply current to 25A. The device also has a charge current monitor, under voltage lockout, automatic recharge. The charge termination and input voltage presence are indicated by two separate status pins. Applications Cellular telephones PDAs Bluetooth applications Battery-powered devices Order code Part number STBC08PMR September 2006 Package QFN6 (3mm x 3mm) Rev. 1 Packaging 4500 parts per reel 1/17 www.st.com 17 STBC08 Contents 1 2 3 4 5 6 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 6.12 6.13 Charge cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 VCC Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Power ON pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 CHRG pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 PROG pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Programming charge current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 BAT pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Charge termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Automatic recharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Soft start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Thermal regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Stability considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 STBC08 Block diagram 1 Figure 1. Block diagram Block diagram 3/17 Pin configuration STBC08 2 Figure 2. Pin configuration Pin connections (top view) Table 1. Pln N 1 Pin description Symbol BAT Note This pin provides an accurate 4.2V output voltage and the charge current to the battery. Only 2A reverse current can flow in to the device when in Shutdown mode 2 Open Drain. When the STBC08 detects an undervoltage lockout condition or when the POWER ON external adaptor provide an input voltage higher than 7.2V or less than battery voltage, POWER ON goes in high impedance state CHRG GND PROG VCC Open Drain. This pin goes in low impedance when the STBC08 is in precharge or charge mode Ground pin Charge current program. Charge Current monitor and shutdown pin. The current limitation is programmed using a 1% tolerance RPROG between PROG pin and GND Input supply voltage. The input range is from 4.25 to 6.5V. If VCC Figure 3. Application circuit 4/17 STBC08 Maximum ratings 3 Table 2. Symbol Vcc VBAT VPROG VCHRG Maximum ratings Absolute maximum ratings Parameter Input supply voltage BAT pin voltage PROG pin voltage CHRG pin voltage POWER ON pin voltage BAT pin current PROG pin current BAT short circuit duration PD TJ TSTG TOP Power dissipation Max junction temperature Storage temperature range Operating junction temperature range Value From -0.3 to 10 From -0.3 to VCC+0.3 From -0.3 to VCC+0.3 From -0.3 to 7 From -0.3 to 7 800 800 Continuous Internally Limited 125 -65 to 125 -40 to 85 mW C C C Unit V V V V V mA A VPOWER-OM IBAT IPROG Table 3. Symbol RthJA Thermal Data Parameter Thermal Resistance Junction-Ambient Value 105.7 Unit C/W 5/17 Electrical characteristics STBC08 4 Table 4. Symbol VCC Electrical characteristics Electrical characteristics (VCC = 5V, CI = 1F, TJ = -40 to 85 unless otherwise specified) (Note 2). Parameter Supply voltage Charge mode, RPROG =10K Standby mode (charge terminated) ICC Supply current (Note 1) Shutdown mode RPROG not connected VCC < VBAT VCC < VUV VBAT Termination output voltage VCC = 4.3V to 6.5V Current mode RPROG=10K Current mode RPROG=2K IBAT BAT pin current Standby mode VBAT=4.2V Shutdown mode (RPROG not connected), TJ=25C Sleep mode, VCC=0V, TJ=25C IPRE VPRE Pre-charge current Pre-charge threshold VBAT<2.8V RPROG =2K TJ=25C RPROG =10K VBAT falling Hysteresis RPROG =10K VCC Undervoltage lockout VCC Low to High RPROG =10K Hysteresis RPROG =10K PROG Pin Rising VMSD Manual shutdown threshold PROG Pin Falling VCC Low to High TJ=25C RPROG =10K VCC High to Low TJ=25C RPROG =10K RPROG =10K RPROG =2K Current Mode RPROG =10K ICHRG=5mA Pull-up IPOWER-ON=5mA 0.35 0.93 0.85 50 5 0.95 85 30 0.1 mA/mA 0.1 1.0 0.35 1.07 0.6 1 0.6 V V A V 1.05 120 mV 50 20 2.8 70 3.65 50 1.15 4.158 90 465 0 Test Min. 4.25 150 150 21 17 17 4.2 100 500 -2.5 1 1 45 2.9 100 3.80 180 1.21 Typ. Max. 6.5 500 300 40 50 40 4.242 110 535 -6 2 2 70 3.0 130 3.95 300 1.30 V V mA mA A A A mA V mV V mV A Unit V VUV VASD VCC-VBAT Lockout threshold ITERM VPROG VCHRG IPOWER_ON IPOWER_ON C/10 Termination current threshold (IBAT/IBATC10) (Note 3) PROG pin voltage CHRG Pin pull-down voltage POWER-ON pin leakage current POWER-ON pin pull-down voltage 6/17 STBC08 Table 4. Symbol VRECHRG TLIM RON tSS TRECHARGE tTERM IPROG Electrical characteristics Electrical characteristics (VCC = 5V, CI = 1F, TJ = -40 to 85 unless otherwise specified) (Note 2). Parameter Test Min. Typ. 200 120 600 IBAT=0 to IBAT=1000V/RPROG VBAT High to Low IBAT Falling Below ICHG/10 0.75 400 100 2 1000 1 4.5 2500 Max. Unit mV C m s ms s A Recharger battery threshold Battery Voltage TJ=25C voltage RPROG =10K Junction temperature in constant temperature mode Power Fet "ON" resistance (Between VCC and BAT) Soft-start time Recharge comparator filter time Note 4 Termination comparator filter time Note 4 PROG pin pull-up current Note: 1 2 3 4 Supply current includes PROG pin current but not any current delivered to the battery through the VBAT pin. The STBC08 was tested using a battery simulator and an output capacitor value of 4.7F ITERM is expressed as a fraction of measured full charge current with indicated PROG resistor Guaranteed by design 7/17 Typical performance characteristics STBC08 5 Typical performance characteristics Figure 4. IBAT vs Supply voltage Figure 5. VBAT vs VCC Figure 6. IBAT vs temperature Figure 7. VPROG vs temperature Figure 8. IBAT/IPROG vs temperature Figure 9. Recharge battery threshold voltage vs. temperature 8/17 STBC08 Typical performance characteristics Figure 10. IBAT/IPROG vs VCC Figure 11. IBAT vs VBAT Figure 12. VCHRG vs temperature (CHRG pin output low voltage) Figure 13. IBAT vs VPROG Figure 14. Power FET "ON" resistance 9/17 Application information STBC08 6 Application information The STBC08 uses an internal P-Channel MOSFET to work in constant current and constant voltage method. It is able to provide up to 800mA with a final regulated output voltage of 4.2V 1% in full temperature range. No blocking diode and sensing resistor are required. It is also possible to use an USB port as power supply voltage. 6.1 Charge cycle A charge cycle begins when the voltage at the VCC pin rises above the UVLO threshold level, the RPROG program resistor of 1% is connected between the PROG pin to GND pin and when a battery is connected to the charger output. If the battery voltage is below 2.9V, the charger enters Trickle Charge mode. In this condition, the device supplies 1/10 of the programmed charge current to bring the battery voltage up to safe level otherwise the life of a battery is reduced. If the BAT pin voltage is higher than 2.9V the charger enters in Constant Current Mode. When the BAT pin voltage is close to the final float voltage (4.2V) the device enters in Constant Voltage Mode and the charge current begins to decrease. The charge cycle is terminated when the current drops to 1/10 of the programmed value. 6.2 VCC Pin Input Supply Voltage. This pin is used to supplie the device in the range from 4.25V to 6.5V voltage. A bypass capacitor of 1F is recommended for use. When VCC value drops of 30mV of the BAT pin voltage, the device enters in Shutdown Mode, dropping IBAT to less than 2A. 6.3 Power ON pin The POWER ON pin is an open drain flag that indicates VCC presence, VUVLO CHRG pin The CHRG pin is an open drain flag, it indicates the status of the charge. When the pin is in low state, the device is charging the battery. If the pin is in high impedance state the charge is terminated. Table 5. CHRG CHRG LOW LOW 00 HIGH 01 11 Power-ON HIGH Table 5 describes Flag Status values for the CHRG pin. 10/17 STBC08 Application information -00 is Precharge Mode (Trickle charge mode) or Charge Mode. VCC is higher than VUVLO and RPROG is connected to the PROG pin. - 01 is STANBY MODE (charge completed) or SHUTDOWN MODE (RPROG not connected). - 11 supply is not sufficient. 6.5 PROG pin Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a 1% resistor, RPROG, to ground. When the device is charging in constant current, the value of voltage on this pin is 1.0V. In other conditions, the voltage on this pin can be used to measure the charge current using the following formula: IBAT = (VPROG/RPROG)*1000 The PROG pin is used to shut down the device, disconnecting the program resistor from ground a 1A current flows to pull the PROG pin high. If the value of this Pin is 1.21V (shutdown threshold voltage), the device enters Shutdown mode and the input supply current drops to 25A. Driving this pin to voltage beyond 2.4V a current of 35A flows into the device from PROG pin. 6.6 Programming charge current The RPROG resistor is used to set the charge current value. The battery charge current is 1000 times the Prog pin current value. The program resistor and the charge current are calculated using the following formula: RPROG=1000*VPROG/IBAT; The charge current out of the BAT pin can be monitored through the PROG pin voltage using the following equation: IBAT=(VPROG/RPROG)x1000 6.7 BAT pin Charge Current Output pin. It provides charge current to the battery and regulates the final float voltage to 4.2V. An internal precision resistor is used as a feedback loop to compare the VO with the reference. 6.8 Charge termination A charge cycle is terminated when the final float voltage is reached consequently the charge current falls to 1/10th of the programmed value. The charge is over when the PROG pin voltage falls below 100mV for longer time than tTERM (~1ms). The charge current is latched off, the device enters in standby mode and the input supply current drops to 200A. 11/17 Application information STBC08 6.9 Automatic recharge The device restarts the charge cycle when the battery voltage falls below 4.05V to maintain the battery capacity value higher than 80%. During the recharge time, the CHRG pin goes low state. 6.10 Soft start When a charge cycle starts, a internal soft start circuit minimizes the inrush current. At starting phase, the charge current ramps from zero to the full scale in a 100s period time. 6.11 Thermal regulation An internal thermal feedback loop reduces the output current if the die temperature attempts to rise above a present value of approximately 120C. This feature protects the device from excessive temperature and allows the user to push the limits of the power handling capability of a given circuit board without risk of damaging the device. 6.12 Power dissipation It is very important to use a good thermal PC board layout to maximize the available output current. The thermal path for the heat generated by the IC is from the die to the copper lead frame through the package leads and exposed pad to the PC board copper. The PC board copper is the heat sink. The footprint copper pads should be as wide as possible and expand out to larger copper areas to spread and dissipate the heat to the surrounding ambient. Feed through vias to inner or backside copper layers are also useful in improving the overall thermal performance of the device. Other heat sources on the board, not related to the device, must also be considered when designing a PC board layout because they will affect overall temperature rise and the maximum output current. 6.13 Stability considerations The STBC08 contains two control loops: constant voltage and constant current. The constant-voltage loop is stable without any compensation when a battery is connected with low impedance leads. Excessive lead length, however, may add enough series inductance to require a bypass capacitor of at least 1F from BAT to GND. Furthermore, a 4.7F capacitor with a 0.2 to 1 series resistor from BAT to GND is required to keep ripple voltage low when the battery is disconnected. 12/17 STBC08 Package mechanical data 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 13/17 Package mechanical data STBC08 DFN6 (3x3) MECHANICAL DATA mm. DIM. MIN. A A1 A3 b D D2 E E2 e L 0.30 0.23 2.90 2.23 2.90 1.50 0.80 0 TYP 0.90 0.02 0.20 0.30 3.00 2.38 3.00 1.65 0.95 0.40 0.50 0.012 0.38 3.10 2.48 3.10 1.75 0.009 0.114 0.088 0.114 0.059 MAX. 1.00 0.05 MIN. 0.031 0 TYP. 0.035 0.001 0.008 0.012 0.118 0.094 0.118 0.065 0.037 0.016 0.020 0.015 0.122 0.098 0.122 0.069 MAX. 0.039 0.002 inch 7946637A 14/17 STBC08 Package mechanical data Tape & Reel QFNxx/DFNxx (3x3) MECHANICAL DATA mm. DIM. MIN. A C D N T Ao Bo Ko Po P 3.3 3.3 1.1 4 8 12.8 20.2 60 18.4 0.130 0.130 0.043 0.157 0.315 TYP MAX. 330 13.2 0.504 0.795 2.362 0.724 MIN. TYP. MAX. 12.992 0.519 inch 15/17 Revision history STBC08 8 Table 6. Date Revision history Revision history Revision 1 Initial release. Changes 04-Sep-2006 16/17 STBC08 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. 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