HX4056

HX4056 1A Standalone Linear Li - lon Battery Charger General Description Features The HX4056 is a complete constant-current/constant- voltage  Programmable Charge Current up to 1A linear charger for single cell lithium -ion batteries. Its ESOP8  No MOSFET, Sense Resistor or Blocking Diode Required package and low external component count make the HX4056  Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize  Charge Rate Without Risk of Overheating  4.2V Charge Voltage with ± 1% Accuracy  Charge Current Monitor Output for Gas Gauging  Automatic Recharge ambient temperature. The charge voltage is fixed at 4.2V, and  2.9V Trickle Charge Threshold the charge current can be programmed externally with a single  C/10 Charge Termination resistor. The HX4056 automatically terminates the charge cycle  Output OCP  Charging OTP  Package in ESOP8 ideally suited for portable applications. Furthermore, the HX4056 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 when the charge current drops to 1/10th the programmed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the HX4056 automatically enters a low current state, dropping the battery drain current to less than 1µA. Other features include charge Typical Application Circuit current monitor, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. VIN LP4056 VIN BAT STAT 2 ISET 4 Order Information 5 6 HX4056 □□ □ 2 STAT 1 Riset 2K 7 10uF F:Pb-Free Package Type SP:ESOP8 10uF GND BATTERY GND 3 9 Marking Information Part Marking Applications HX4056 4056 Package ESOP8 Shipping 2.5K/REEL  Portable Media Players/MP3 players  Cellular and Smart mobile phone Marking indication:  PDA/DSC Y:Production year W:Production week X:Production batch.  Bluetooth Applications V1.3 Page 1 of 7 HX4056 Functional Pin Description Package Type Pin Configurations ESOP8 Pin Name Description 1、8 NC No Connector. NC 1 ISET 2 GND 3 VIN 4 GND 9 8 NC 7 STAT1 6 STAT2 5 BAT Charge Current Program and Charge Current Monitor Pin. The charge current is 2 ISET programmed by connecting a 1% resistor, R ISET , 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/RISET 3、9 GND Ground. 4 VIN Positive Input Supply Voltage. 5 BAT Charge Current Output. 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 . Open-Drain Charge Status Output. When the battery is charging, the STAT 2 pin could be 6 STAT2 pulled High by an external pull high resistor. When the charge cycle is completed, the pin is pulled Low by an internal N-channel MOSFET. Open-Drain Charge Status Output. When the battery is charging, the STAT1 pin is pulled 7 STAT1 low by an internal N-channel MOSFET. When the charge cycle is completed, the pin could be pulled High by an external pull high resistor. V1.3 Page 2 of 7 HX4056 Function Block Diagram 4 VIN 125℃ TA 1000X 1X TDIE - BAT 5μA + 5 MA R1 VA CA - + 6 STAT2 C1 SHDN + R3 C2 C3 + 0.1V - R5 + - TO BAT R2 REF 1.22V R4 3μA VCC 2.9V 2 Absolute Maximum Ratings - - 1V 7 STAT1 + ISET GND 3 Note1  Input to GND(VIN) --------------------------------------------------------------------------------------------- -0.3V to 8V  Other Pin to GND ---------------------------------------------------------------------------------------------- -0.3V to 6V  BAT Short-circuit Duration ------------------------------------------------------------------------------------ Continuous  Maximum Junction Temperature ----------------------------------------------------------------------------------- 125℃  Operating Junction Temperature Range (TJ) ----------------------------------------------------------- -20℃ to 85℃  Maximum Soldering Temperature (at leads, 10 sec) ---------------------------------------------------------- 260℃ Note1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect devic e reliability. Thermal Information  Maximum Power Dissipation (ESOP8, PD, T A=25°C) ----------------------------------------------------------- 1.5W  Thermal Resistance (ESOP8, JA) ------------------------------------------------------------------------------- 50℃/W V1.3 Page 3 of 7 HX4056 ESD Susceptibility  HBM(Human Body Mode) --------------------------------------------------------------------------------------------- 2KV  MM(Machine Mode)----------------------------------------------------------------------------------------------------- 200V Electrical Characteristics (TA = 25℃. VIN = 5V, unless otherwise noted.) SYMBOL PARAMETER VIN Adapter/USB Voltage Range IIN Input Supply Current VFLOAT Regulated Output (Float) Voltage IBAT BAT Pin Current CONDITIONS MIN TYP. MAX UNITS 3.9 5 6 V Charge Mode, RISET= 10K 300 1000 Standby Mode (Charge Terminated) 50 200 0℃ ≤ TA ≤ 85℃, IBAT = 40mA 4.158 4.2 4.242 RISET = 10K，Current Mode 80 100 120 RISET = 2K，Current Mode 400 500 600 RISET = 1K，Current Mode 800 1000 1200 Standby Mode, VBAT = 4.2V Sleep Mode, VIN = 0V 0 ±1 uA V mA uA VTRIKL Trickle Charge Threshold Voltage R ISET = 10k, V BAT Rising 2.9 V VTRHYS Trickle Charge Hysteresis Voltage R ISET = 10K 100 mV ITRIKL Trickle charge current VBAT < VTRIKL, RISET =10K 10 VBAT < VTRIKL, RISET=2K 50 VUV VIN Undervoltage Lockout Threshold VUVHYS VIN Undervoltage Lockout Hysteresis VASD VIN–VBAT Lockout Threshold Voltage VISET ISET Pin Voltage RISET = 10K,Charge Mode VSTAT1 STAT1 Pin Output Low Voltage ISTAT1 = 5mA 0.5 V VSTAT2 STAT2 Pin Output Low Voltage ISTAT2 = 5mA 0.5 V ΔVRECHRG Recharge Battery Threshold Voltage VFLOAT - VR ECHRG 200 mV V1.3 From VIN Low to High mA 3.7 3.8 3.9 V 150 200 300 mV 100 150 mV 1 V 150 Page 4 of 7 HX4056 Applications Information The HX4056 is a single cell lithium -ion battery charger using a constant-current/constant-voltage algorithm. It can deliver up to 1A of charge current with a final float voltage accuracy of ± 1% (using a good thermal PCB layout). The HX 4056 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 HX4056 is capable of operating from a USB power source. Charge Status Indicator (STAT1,STAT2) The charge status output has two different states: strong pull- down (~5mA) and high impedance. The strong pull-down state indicates that the HX4056 is in a charge cycle. High impedance indicates that the charge cycle complete or the HX4056 is in under voltage lockout mode: either VIN is less than 100mV above the BAT pin voltage or insufficient voltage is applied to the VIN pin. A microprocessor can be used to distinguish between these two states. Charge Stage STAT1 Status STAT2 Status Normal Charge Cycle Charging Low High A charge cycle begins when the voltage at the VIN pin rises Charge Complete High Low above the UVLO threshold level and a 1% program resistor is connected from the ISET 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 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 HX4056 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 1/10 the ISET rammed value after the final float voltage is reached. This condition is detected by using an internal, filtered comparator to monitor the ISET pin. When the ISET pin voltage falls below 100mV for longer than tTERM(typically 1ms), charging is terminated. The charge current is latched off and the LP4056 enters standby mode, where the input supply current drops to 200µA. In this state, all loads on the BAT pin must be supplied by the battery. (Note: C/10 termination is disabled in trickle charging and thermal limiting modes). Programming Charge Current The charge current is programmed using a single resistor from the ISET pin to ground. The battery charge current is 1000 times the current out of the ISET pin. The program resistor and the charge current are calculated using the following equations: R ISET=1000÷IBAT, IBAT=1000÷RISET The charge current out of the BAT pin can be determined at any time by monitoring the ISET pin voltage using the following equation: IBAT=VISET÷RISET×1000 V1.3 Page 5 of 7 HX4056 Thermal Limit VIN Bypass Capacitor An internal thermal feedback loop reduces the programmed Many types of capacitors can be used for input bypassing; charge current if the die temperature attempts to rise above a however, caution must be exercised when using multilayer preset value of approximately 125℃. This feature protects the ceramic capacitors. Because of the self-resonant and high Q HX4056 from excessive temperature and allows the user to characteristics of some types of ceramic capacitors, high push the limits of the power handling capability of a given voltage transients can be generated under some start-up circuit board without risk of damaging the HX4056. The charge conditions, such as connecting the charger input to a live current can be set according to typical (not worst-case) power source. Adding a 1.5Ω resistor in series with an X5R ambient temperature with the assurance that the charger will ceramic capacitor will m inimize start-up voltage transients. automatically reduce the current in worst-case conditions. Automatic Recharge The LP4056 constantly monitors the BAT pin voltage in Layout Considerations  keep their traces short and wide.  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 mode, the input voltage must be removed and reapplied. For the main current paths as indicated in bold lines, Put the input capacitor as close as possible to the device pins (VIN and GND).  Connect all analog grounds to a command node and then connect the command node to the power ground behind the output capacitors. Power Dissipation The conditions that cause the HX4056 to reduce charge current through thermal feedback can be approximated by considering the power dissipated in the IC. Nearly all of this power dissipation is generated by the internal MOSFET—this is calculated to be approximately: PD=(VIN－VBAT) × I BAT Where PD is the power dissipated, V IN is the input supply voltage, VBAT is the battery voltage and IBAT is the charge current. The approximate ambient temperature at which the thermal feedback begins to protect the IC is: TA=125℃-PDθ JA TA=125℃-(VIN-VBAT)×IBAT×θJA V1.3 Page 6 of 7 HX4056 Packaging Information ESOP8 V1.3 Page 7 of 7