SD8003

SD8003 Shouding Standalone Linear Li-Lon Battery Charger with Thermal Regulation Features Description
Programmable Charge Current Up to The SD8003 500mA constant-current/constant voltage linear charger No MOSFET, Sense Resistor or Blocking for single cell lithium-ion batteries. Its package Diode Required and low external component count make the Constant-Current/Constant-Voltage SD8003 ideally suited for portable applications.

Operation with Thermal Regulation to





Furthermore, designed Maximize Charge Rate to is a the SD8003 work within complete is specifically USB power specifications. Without Risk of Overheating Charges Single Cell Li-Ion Batteries No external sense resistor is needed, and no Directly from USB Port blocking diode is required due to the internal Preset 4.2V Charge Voltage with 1% Accuracy MOSFET architecture. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. Automatic Recharge The SD8003 automatically terminates the 2.9V Trickle Charge Threshold Available in 6-Lead SOT-23 Package charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached. Applications



The SD8003 converters are available in the Charger for Li-Ion Coin Cell Batteries industry standard SOT-23-6L power packages Portable MP3 Players, Wireless Headsets (or upon request). Bluetooth Applications Multifunction Wristwatches Order Information SD8003 - ①②: SYMBOL DESCRIPTION ① Denotes Output voltage: ② Denotes Package Types: N: 4.2V E: SOT-23-6L http://www.shouding.net 1 SD8003 Shouding Typical Application DC+ LED2 C1 LED1 4 VCC 1 CHRG R1 300Ω R2 5 LD 300Ω BAT VOUT 3 PROG 6 GND 2 RSET C2 * IBAT = (VPROG/RSET)*900 * When charging in constant-current mode, the VPROG is usually 1V. Pin Assignment PIN NUMBER TOP VIEW PIN NAME FUNCTION SOT-23- 6L 6 1 5 2 4 3 SOT-23- 6L http://www.shouding.net Open-Drain Charge Status 1 CHRG 2 GND Ground 3 BAT Charge Current Output 4 VCC 5 LD 6 PROG Output Positive Input Supply Voltage. Open-Drain Charge Status Output Charge Current Program 2 SD8003 Shouding Pin Description CHRG (Pin 1): Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, high impedance is forced to the CHRG pin and LD (pin 5) is pulled low, indicating an “AC present” condition. GND (Pin 2): Ground. BAT (Pin 3): Charge Current Output. It should be bypassed with at least a 1uF capacitor. It Provides charge current to the battery and regulates the final float voltage to 4.2V. An internal precision resistor divider from this pin sets the float voltage which is disconnected in shutdown mode. VCC (Pin 4): Positive Input Supply Voltage. It Provides power to the charger VCC can range from 4.5V to 6V and should be bypassed with at least a 10uf capacitor. LD (Pin 5): Open-Drain Charge Status Output. See CHRG pin (Pin 1). PROG (Pin 6): Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a 1% resistor, RPROG, to ground. When charging in constant-current mode, this pin servos to 1V. In all modes, the voltage on this pin can be used to measure the charge current using the following formula: IBAT = (VPROG/RSET)*900. Absolute Maximum Ratings (Note 1)








Input Supply Voltage (VCC) ........................................................................................ –0.3V to 7V PROG............................................................................................................. – 0.3V to VCC + 0.3V BAT ......................................................................................................................... –0.3V to 7V CHRG..................................................................................................................... –0.3V to 7V BAT Pin Current ..................................................................................................................... 800mA Maximum Junction Temperature .............................................................................................. 125℃ Operating Ambient Temperature Range (Note 2)........................................................ –40℃ to 85℃ Storage Temperature Range …………………………………………….................. –65 ℃to 125℃ Lead Temperature (Soldering, 10 sec)..................................................................................... 300℃ Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: The SD8003 is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assur ed by design, characterization and correlation with statistical process controls. http://www.shouding.net 3 SD8003 Shouding Electrical Characteristics Operating Conditions: TA=25 SYMBOL VCC ℃, V CC=5V PARAMETER unless otherwise specified. CONDITIONS Input Supply Voltage Input Supply Current MIN TYP MAX UNITS 4.75 5 6 V Standby Mode (Charge 48 µA 80 µA Terminated) l ICC Shutdown Mode (RPROG Not Connected, VCC < VBAT) VFLOAT IBAT Regulated Output (Float) Voltage BAT Pin Current 0℃≤TA≤8  5℃, IBAT = 50mA 4.15 4.2 4.24 V RPROG = 10k, Current Mode 90 mA RPROG = 2k, Current Mode 450 mA Standby Mode, VBAT = 4.2V 7 µA Shutdown Mode (RPROG Not 13 µA Sleep Mode, VCC = 0V 0.1 µA VBAT < VTRIKL, RPROG = 2k 45 mA RPROG = 10k, VBAT Rising 2.9 V RPROG = 2k 45 mA 1 V 250 mV 660 mΩ Connected) ITRIKL VTRIKL ITERM Trickle Charge Current Trickle Charge Threshold Voltage C/10 Termination Current Threshold VPROG PROG Pin Voltage RPROG = 2k, Current Mode ∆VRECHRG Recharge Battery VFLOAT - VRECHRG RON Threshold Voltage Power FET “ON” Resistance (Between VCC and BAT) http://www.shouding.net 4 SD8003 Shouding Application Information The SD8003 is a single cell lithium-ion battery charger using a constant-current/constant-voltage algorithm. It can deliver up to 800mA of charge current (using a good thermal PCB layout) with a final float voltage accuracy of ±1%. The SD8003 includes an internal P-channel power MOSFET and thermal regulation circuitry. No blocking diode or external current sense resistor is required; thus, the basic charger circuit requires only two external components. Furthermore, the SD8003 is capable of operating from a USB power source. Normal Charge Cycle A charge cycle begins when the voltage at the VCC pin rises above 4.5V and a 1% program resistor is connected from the PROG pin to ground or when a battery is connected to the charger output. If the BAT pin is less than 2.9V, the charger enters trickle charge mode. In this mode, the SD8003 supplies approximately 1/10 th e programmed charge current to bring the battery voltage up to a safe level for full current charging. When the BAT pin voltage rises above 2.9V, the charger enters constant-current mode, where the programmed charge current is supplied to the battery. When the BAT pin approaches the final float voltage (4.2V), the SD8003 enters constant-voltage mode and the charge current begins to decrease. When the charge current drops to 1/10 of the programmed value, the charge cycle ends. Charge Termination A charge cycle is terminated when the charge current falls to 1/10th the programmed value after the final float voltage is reached. This condition is detected by using an internal, filtered comparator to monitor the PROG pin. When charging, transient loads on the BAT pin can cause the PROG pin to fall below 100mV for short periods of time before the DC charge current has dropped to 1/10th the programmed value. Once the average charge current drops below 1/10th the programmed value, the SD8003 terminates the charge cycle and ceases to provide any current through the BAT pin. In this state, all loads on the BAT pin must be supplied by the battery. The SD8003 constantly monitors the BAT pin voltage in standby mode. If this voltage drops below the 4V recharge threshold (VRECHRG), another charge cycle begins and current is once again supplied to the battery. To manually restart a charge cycle when in standby mode, the input voltage must be removed and reapplied, or the charger must be shut down and restarted using the PROG pin. Thermal Limiting An internal thermal feedback loop reduces the programmed charge current if the die temperature attempts to rise above a preset value of approximately 120°C. This feature protects the SD8003 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 SD8003. Th e charge current can be set according to typical (not worst-case) ambient temperature with the assurance that the charger will automatically reduce the current in worst-case conditions. ThinSOT power considerations are discussed further in the Applications Information section. http://www.shouding.net 5 SD8003 Shouding Automatic Recharge A charge cycle restarts when the battery voltage falls below 4V (which corresponds to approximately 80% to 90% battery capacity). This ensures that the battery is kept at or near a fully charged condition and eliminates the need for periodic charge cycle initiations. CHRG output enters a strong pull down state during recharge cycles. VCC Bypass Capacitor Many types of capacitors can be used for input bypassing, however, caution must be exercised when using multilayer ceramic capacitors. Because of the self-resonant and high Q characteristics of some types of ceramic capacitors, high voltage transients can be generated under some start-up conditions, such as connecting the charger input to a live power source. Adding a 1.5W resistor in series with an X5R ceramic capacitor will minimize start-up voltage transients. http://www.shouding.net 6 SD8003 Shouding Packaging Information SOT-23-6L Package Outline Dimension Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 1.050 1.250 0.041 0.049 A1 0.000 0.100 0.000 0.004 A2 1.050 1.150 0.041 0.045 b 0.300 0.500 0.012 0.020 c 0.100 0.200 0.004 0.008 D 2.820 3.020 0.111 0.119 E 1.500 1.700 0.059 0.067 E1 2.650 2.950 0.104 0.116 e 0.950(BSC) 0.037(BSC) e1 1.800 2.000 0.071 0.079 L 0.300 0.600 0.012 0.024 http://www.shouding.net 7