LP4060B5F

Preliminary Datasheet LP4060 800mA Standalone Linear Li-Ion Battery Charger with Thermal Regulation in SOT23-5 General Description Features The LP4060 is a complete constant-current/constant- voltage  Programmable Charge Current Up to 800mA linear charger for single cell lithium-ion batteries. Its SOT23-5  No MOSFET, Sense Resistor or Blocking Diode Required package and low external component count make the LP4060  Complete Linear Charger in SOT23-5 Package for Single Cell Lithium-ion Batteries  Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize  Charge Rate Without Risk of Overheating  4.2V Charge Voltage with ± 1% Accuracy ambient temperature. The charge voltage is fixed at 4.2V/4.35V,  Charge Current Monitor Output for Gas Gauging and the charge current can be programmed externally with a  Automatic Recharge single resistor. The LP4060 automatically terminates the charge  2.9V Trickle Charge Threshold  C/10 Charge Termination supply (wall adapter or USB supply) is removed, the LP4060  1uA Supply Current in Shutdown automatically enters a low current state, dropping the battery  Output OCP drain current to less than 1µA. Other features include charge  Charging OTP ideally suited for portable applications. Furthermore, the LP4060 is specifically designed to work within USB power specifications. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached. When the input current monitor, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. Typical Application Circuit Vin Order Information LP4060 □ □ 4 1 □ 10uF + F: Pb-Free R LED 2 VCC BAT 3 CHRG GND PROG 5 + LP4060B5F Package Type 5K 1uF BATT B5: SOT23-5 Marking Information Applications Part  Portable Media Players/MP3 players  Cellular and Smart mobile phone  PDA/DSC  Bluetooth Applications LP4060-10 LP4060B5F Marking LP4060 BBYWX Package SOT23-5 Shipping 3K/REEL Marking indication: Oct.-2018 Y:Production year W:Production week X:Production batch. Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 1 of 7 Preliminary Datasheet LP4060 Functional Pin Description Package Type Pin Configurations TOP VIEW SOT23-5 CHRG 1 GND 2 BAT 3 5 PROG 4 VCC SOT23-5 Pin Description Pin Name Description Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low 1 CHRG by an internal N-channel MOSFET. When the LP4060 detects an under voltage lockout condition or charge complete, CHRG is forced high impedance. 2 GND 3 BAT Ground. Charge Current Output. Provides charge current to the battery and regulates the final float voltage to 4.2V/4.35V. An internal precision resistor divider from this pin sets the float voltage. Positive Input Supply Voltage. Provide power to the charger. VCC can range from 3.9V to 4 VCC 6.5V and should be bypassed with at least a 1µF capacitor. When VCC drops to within 30mV of the BAT pin voltage, the LP4060 enters shutdown mode, dropping IBAT to less than1µA. Charge Current Program and Charge Current Monitor Pin. The charge current is programmed 5 PROG 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=1000/RPROG LP4060-10 Oct.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 2 of 7 Preliminary Datasheet LP4060 Function Block Diagram Absolute Maximum Ratings Note 1  Input to GND(VCC) ------------------------------------------------------------------------------------------------------------------ -0.3V to 7V  Other Pin to GND --------------------------------------------------------------------------------------------------------------------- -0.3V to 6V  BAT Pin Current --------------------------------------------------------------------------------------------------------------------------- 800mA  BAT Short-circuit Duration --------------------------------------------------------------------------------------------------------- Continuous  PROG Pin Current ------------------------------------------------------------------------------------------------------------------------- 800uA  Maximum Junction Temperature -------------------------------------------------------------------------------------------------------- 125℃  Operating Ambient Temperature Range (TA) ------------------------------------------------------------------------------ -40℃ to 85℃  Storage Temperature ------------------------------------------------------------------------------------------------------ -65℃ to 165℃  Maximum Soldering Temperature (at leads, 10 sec) ------------------------------------------------------------------------------- 260℃ Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Thermal Information  Maximum Power Dissipation (SOT23-5, PD, TA=25℃) ----------------------------------------------------------------------------- 0.5W  Thermal Resistance (SOT23-5, θJA) ----------------------------------------------------------------------------------------------- 200℃/W ESD Susceptibility  HBM(Human Body Mode) ------------------------------------------------------------------------------------------------------------------- 2KV  MM(Machine Mode) -------------------------------------------------------------------------------------------------------------------------- 200V LP4060-10 Oct.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 3 of 7 Preliminary Datasheet LP4060 Electrical Characteristics (TA=25℃. VCC=5V, unless otherwise noted.) Symbol Parameter VCC Adapter/USB Voltage Range ICC Condition Input Supply Current Min Typ Max Units 3.9 5 6 V Charge Mode, RPROG=10k 300 1000 Standby Mode (Charge Terminated) 50 200 50 200 Shutdown Mode (RPROG=NC, VCC < VBAT, or VCC < VUV) VFLOAT IBAT Regulated Output (Float) Voltage BAT Pin Current μA 0℃≤TA≤85℃ 4.158 4.2 4.242 V RPROG=10k, Current Mode 80 100 120 mA RPROG=2k, Current Mode 400 500 600 mA Standby Mode, VBAT=4.2V ±1 ±2 Shutdown Mode (RPROG=NC) ±1 ±2 Sleep Mode, VCC=0V -0.1 -1 2.9 3.0 VTRIKL Trickle Charge Threshold Voltage RPROG=10k, VBAT Rising VTRHYS Trickle Charge Hysteresis Voltage RPROG=10k 100 mV ITRIKL Trickle charge current VBAT < VTRIKL 30 mA VUV VCC Under Voltage Lockout Threshold From VCC Low to High VUVHYS VCC Under Voltage Lockout Hysteresis VASD VCC–VBAT Lockout Threshold Voltage VPROG PROG Pin Voltage RPROG=10k, Charge Mode 1 VCHRG CHRG Pin Output Low Voltage ICHRG=5mA 0.35 ICHRG CHRG Pin Weak Pull-Down Current VCHRG=5V ΔVRECHRG Recharge Battery Threshold Voltage VFLOAT-VRECHRG TLIM RON 2.8 μA 3.7 3.8 3.9 300 V V mV VCC from Low to High 70 100 140 mV VCC from High to Low 5 30 50 mV 100 Junction Temperature in Constant Temperature Mode Power FET “ON” Resistance (Between VCC and BAT) 150 V 0.6 V 5 uA 200 mV 125 ℃ 400 mΩ tSS Soft-Start Time IBAT=0 to IBAT=1000V/RPROG 100 μs tRECHRG Recharge Comparator Filter Time VBAT High to Low 2 ms LP4060-10 Oct.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 4 of 7 Preliminary Datasheet LP4060 Application Information The LP4060 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 LP4060 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 three external components. Furthermore, the LP4060 is capable of operating from a USB power source. Normal Charge Cycle above the UVLO threshold level 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. When the BAT voltage rises above 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 the PROG pin voltage falls below 100mV for longer than tTERM (typically 1ms), charging is terminated. The charge current is latched off and the LP4060 enters standby mode, where the input supply current drops to 200µA. When charging, transient loads on the BAT pin can cause the PROG pin to fall below A charge cycle begins when the voltage at the VCC pin rises pin Charge Termination 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 LP4060 enters constant-voltage mode and the charge current begins to decrease. The charge cycle ends when the charge current drops to 1/10 of the programmed value. 100mV for short periods of time before the DC charge current has dropped to 1/10th the programmed value. The 1ms filter time (tTERM) on the termination comparator ensures that transient loads of this nature do not result in premature charge cycle termination. Once the average charge current drops below 1/10th the programmed value, the LP4060 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 LP4060 constantly monitors the BAT pin voltage in standby mode. If this voltage drops below the 4.05V 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 Programming Charge Current mode, the input voltage must be removed and reapplied. The charge current is programmed using a single resistor Charge Status Indicator (CHRG) from the PROG pin to ground. The battery charge current is 1000 times the current out of the PROG pin. The program resistor and the charge current are calculated using the following equations: RPROG=1000V/IBAT IBAT=1000V/RPROG The charge status output has two different states: strong pull-down (~5mA) and high impedance. The strong pull-down state indicates that the LP4060 is in a charge cycle. Once the charge cycle has terminated, the pin state is determined by under voltage lockout conditions. High impedance indicates The charge current out of the BAT pin can be determined at that the charge cycle complete or the LP4060 is in under any time by monitoring the PROG pin voltage using the voltage lockout mode: either VCC is less than 100mV above following equation: the BAT pin voltage or insufficient voltage is applied to the IBAT=VPROG/RPROG×1000 LP4060-10 Oct.-2018 VCC pin. A microprocessor can be used to distinguish between these two states. Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 5 of 7 Preliminary Datasheet LP4060 Charge Termination Automatic Recharge An internal thermal feedback loop reduces the programmed Once the charge cycle is terminated, the LP4060 continuously charge current if the die temperature attempts to rise above a monitors the voltage on the BAT pin using a comparator with preset value of approximately 125℃. This feature protects the a 2ms filter time (tRECHRG). A charge cycle restarts when the LP4060 from excessive temperature and allows the user to battery voltage falls below 4.05V (which corresponds to push the limits of the power handling capability of a given approximately 80% to 90% battery capacity). This ensures circuit board without risk of damaging the LP4060. The charge that the battery is kept at or near a fully charged condition and current can be set according to typical (not worst-case) eliminates the need for periodic charge cycle initiations. ambient temperature with the assurance that the charger will CHRG output enters a strong pull-down state during recharge automatically reduce the current in worst-case conditions. cycles. SOT power considerations are discussed further in the Applications Information section. Power Dissipation The conditions that cause the LP4060 to reduce charge Under voltage Lockout (UVLO) current through thermal feedback can be approximated by An internal under voltage lockout circuit monitors the input considering the power dissipated in the IC. Nearly all of this voltage and keeps the charger in shutdown mode until VCC power dissipation is generated by the internal MOSFET—this rises above the under voltage lockout threshold .The UVLO is calculated to be approximately: circuit has a built-in hysteresis of 300mV. Furthermore, to PD=(VCC-VBAT)×IBAT protect against reverse current in the power MOSFET, the UVLO circuit keeps the charger in shutdown mode if VCC falls Where PD is the power dissipated, VCC is the input supply to within 30mV of the battery voltage. If the UVLO comparator voltage, VBAT is the battery voltage and IBAT is the charge is tripped, the charger will not come out of shutdown mode current. The approximate ambient temperature at which the until VCC raises 100mV above the battery voltage. thermal feedback begins to protect the IC is: TA=125℃-PDθJA Manual Shutdown TA=125℃-(VCC-VBAT)×IBAT×θJA At any point in the charge cycle, the LP4060 can be put into shutdown mode by removing RPROG thus floating the PROG pin. This reduces the battery drain current to less than 1µA and the supply current to less than 50µA. A new charge cycle can be initiated by reconnecting the program resistor. In manual shutdown, the CHRG pin is in a weak pull-down state as long as VCC is high enough to exceed the UVLO conditions. The CHRG pin is in a high impedance state if the LP4060 is in under voltage lockout mode: either VCC is within 100mV of the BAT pin voltage or insufficient voltage is applied to the VCC pin. LP4060-10 Oct.-2018 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 1.5Ω resistor in series with an X5R ceramic capacitor will minimize start-up voltage transients. Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 6 of 7 Preliminary Datasheet LP4060 Packaging Information SOT23-5 LP4060-10 Oct.-2018 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 7 of 7