1A, Single Cell Linear Lithium Battery Charger Features General Description The EC49018 is a complete constant - current & constant-voltage linear charger for single cell lithium-ion batteries. Its SOP-8(Exposed PAD) package and low Programmable Charge Current Up to 1000mA No MOSFET, Sense Resistor or Blocking Diode Required external component count make the EC49018 ideally suited for portable applications. In addition, EC49018 Complete Linear Charger in SOP-8 Package for Single Cell Lithium-Ion Batteries the Constant-Current/Constant-Voltage EC49018 can work within USB and wall adapter. Charges Single Cell Li-Ion Batteries Directly No blocking diode is required because of its from USB Port internal PMOSFET architecture which is able to prevent Preset 4.2V Charge Voltage with ±1.5% Accuracy the negative Charge Current. Thermal feedback Automatic Recharge regulates the charge current to limit the die temperature Two Charge Status Output Pins during high power operation or high ambient C/10 Charge Termination temperature. The charge voltage is fixed at 4.2V, and 2.9V Trickle Charge Threshold the charge current can be programmed externally with a Soft-Start Limits Inrush Current single resistor. The EC49018 automatically terminates Available Radiator in SOP-8(Exposed PAD) the charge cycle when the charge current drops to Package, the Radiator need connect GND or 1/10th the programmed value after the final float voltage impending is reached. EC49018 Other features include current monitor, under Applications voltage lockout, automatic recharge and two status pin Cellular Telephones, PDA, MP3 Players to indicate charge termination and the presence of an input voltage. Charging Docks and Cradles MP3、MP4 Player Digital Still Cameras, Portable Devices USB Bus-Powered Chargers, Chargers Application Diagram E-CMOS Corp. (www.ecmos.com.tw) Page 1 of 8 3H20N Rev. P001 1A, Single Cell Linear Lithium Battery Charger EC49018 Pin Configuration Pin Functions Pin Pin Function Description TEMP Pin Connecting TEMP pin to NTC thermistor’s BAT output in Lithium ion battery pack. Pin Function Description Connect the positive terminal of the battery to BAT pin Constant charge current setting and charge current monitor pin STDBY Open Drain Charge Status Output GND Ground pin CHRG Open Drain Charge Status Output VCC Input Voltage pin PROG CE Chip Enable Input Ordering Information Package Part Number SOP-8 (Exposed PAD) EC49018NNMHR E-CMOS Corp. (www.ecmos.com.tw) Marking 49018 LLLLL YYWWT Marking Information 1. LLLLL：Lot No. 2. YYWW：date Code 3. T：Internal Tracking Code Page 2 of 8 3H20N Rev. P001 1A, Single Cell Linear Lithium Battery Charger EC49018 Absolute Maximum Rating Parameter Symbol Value Units Input Supply Voltage VCC 6.5 V BAT Voltage VBAT 6.5 V TEMP/CE VTEMP 6.5 V CHRG / STDBY VCHRG 6.5 V BAT Pin Current IBAT 1500 mA PROG Pin Current IPROG 1500 uA Maximum Junction Temperature TJ 150 °C Operating Rating Parameter Symbol Value Units Junction Temperature TJ -20 to +85 °C Storage Temperature TSTG -40 to +125 ℃ Lead Temperature ( Soldering, 10sec) TLED 260 ℃ Block Diagram E-CMOS Corp. (www.ecmos.com.tw) Page 3 of 8 3H20N Rev. P001 1A, Single Cell Linear Lithium Battery Charger EC49018 Electrical Characteristics VIN = 5V; TJ = 25°C; unless otherwise specified. Symbol VCC ICC VFLOAT IBAT ITRIKL VTRIKL VTRHYS VUV VUVHYS VASD ITERM VPROG Parameter Conditions Min Typ Max Unit 4.0 5 6.5 V Charge Mode, RPROG = 2K — 146 — µA Standby Mode (Charge Terminated) — 70 — µA Shutdown Mode(RPROG Not Connected, VCC < VBAT, or VCC < VUV) — 30 — µA IBAT = 30mA, RPROG = 10K 4.137 4.2 4.263 V RPROG = 2K, Current Mode — 560 — mA RPROG = 1K, Current Mode — 1120 — mA Standby Mode, VBAT = 4.3V — +/-1 — µA Shutdown Mode (RPROG Not Connected) — +/-1 — µA Sleep Mode, VCC = 0V — +/-1 — µA VBAT < VTRIKL, RPROG = 2K — 60 — mA RPROG = 2K, VBAT Rising — 2.9 — V RPROG=2K — 100 — mV — 3.7 — — 150 — Input Supply Voltage Input Supply Current Regulated Output Voltage BAT Pin Current Trickle Charge Current Trickle Charge Threshold Voltage Trickle Voltage hysteresis Voltage VCC Undervoltage Lockout Threshold From VCC Low to High VCC Undervoltage Lockout Hysteresis V mV VCC – VBAT Lockout PROG Pin Rising — 150 — mV Threshold Voltage PROG Pin Falling — 100 — mV C/10 Termination Current RPROG = 2K — 60 — mA Threshold RPROG = 1K — 100 — mA PROG Pin Voltage RPROG = 2k, Current Mode — 1.0 — V ICHRG = 5mA — — 0.4 V ISTDBY =5mA — — 0.4 V — 80 — %Vcc CHRG Pin Output Low Voltage VSTDBY STDBY Pin Output Low Voltage VTEMP-H TEMP pin voltage of the high-end flip E-CMOS Corp. (www.ecmos.com.tw) Page 4 of 8 3H20N Rev. P001 1A, Single Cell Linear Lithium Battery Charger EC49018 Electrical Characteristics VIN = 5V; TJ = 25°C; unless otherwise specified. Symbol VTEMP-L Parameter Conditions TEMP pin voltage of the low-end flip Min Typ Max Unit — 45 — %Vcc — 150 — mV — 145 — °C ΔVRECHRG Recharge Battery Threshold Voltage TLIM Thermal Protection Temperature tSS Soft-Start Time IBAT = 0 to 1120V/RPROG — 20 — µs tRECHARGE Recharge Comparator Filter Time VBAT High to Low — 1 — ms tTERM Termination Comparator Filter Time IBAT Falling Below ICHG/10 — 1 — ms IPROG PROG Pin Pull-Up Current — 0.5 — µA VFLOAT - VRECHRG Typical Performance Characteristics Complete Charge Cycle (1000mAh Battery) E-CMOS Corp. (www.ecmos.com.tw) Page 5 of 8 3H20N Rev. P001 1A, Single Cell Linear Lithium Battery Charger EC49018 Applications The EC49018 is a complete constant –current & constant-voltage linear charger for single cell lithium-ion batteries. Constant-current & constant - voltage to charger batter by internal MOSFET .It can deliver up to 1A of charge current .No blocking diode or external current sense resistor is required. EC49018 include two Open-Drain charge status Pins: Charge status indicator and battery failure status output .The internal thermal regulation circuit reduces the programmed charge current if the die temperature attempts to rise above a preset value of approximately 145℃. This feature protects the EC49018 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 EC49018 or the external components. Another benefit of adopting thermal regulation is that charge current can be set according to typical, not worst-case, ambient temperatures for a given application with the assurance that the charger will automatically reduce the current in worst-case conditions. The charge cycle begins when the voltage at the VCC pin rises above the UVLO level, a current set resistor is connected from the PROG pin to ground, and the CE pin is pulled above the chip enable threshold. The CHRG pin outputs a logic low to indicate that the charge cycle is on going. At the beginning of the charge cycle, if the battery voltage is below 2.9V, the charge is in recharge mode to bring the cell voltage up to a safe level for charging. The charger goes into the fast charge constant-current mode once the voltage on the BAT pin rises above 2.9 V. In constant current mode, the charge current is set by RPROG. When the battery approaches the regulation voltage 4.2V, the charge current begins to decrease as the EC49018 enters the constant-voltage mode. When the current drops to charge termination threshold, the charge cycle is terminated, and CHRG pin assumes a high impedance state to indicate that the charge cycle is terminated and STDBY pin is pulled low. The charge termination threshold is 10% of the current in constant current mode. To restart the charge cycle, remove the input voltage and reapply it, or momentarily force CE pin to 0V. The charge cycle can also be automatically restarted if the BAT pin voltage falls below the recharge threshold. The on-chip reference voltage, error amplifier and the resistor divider provide regulation voltage with 1% accuracy which can meet the requirement of lithium-ion and lithium polymer batteries. When the input voltage is not present, or input voltage is below VBAT, the charger goes into a sleep mode, dropping battery drain current to less than 3μA. This greatly reduces the current drain on the battery and increases the standby time. The charger can be shutdown by forcing the CE pin to GND. Programming charge current The charge current is programmed using a single resistor from the PROG pin to ground. The program resistor and the charge current are calculated using the following equations.: In application, according the charge current to determine RPROG ,the relation between RPROG and charge current E-CMOS Corp. (www.ecmos.com.tw) Page 6 of 8 3H20N Rev. P001 1A, Single Cell Linear Lithium Battery Charger EC49018 can reference the following chart： RPROG (k) IBAT (mA) RPROG (k) IBAT (mA) 28 40 1.86 600 18.6 60 1.55 720 9.3 120 1.4 800 4.6 240 1.24 900 3.73 300 1.12 1000 2.8 400 --- --- 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 the PROG pin voltage falls below 100mV for longer than tTEMP (typically 1.8mS), Charging is terminated. The charge current is latched off and the EC49018 enters standby mode, where the input supply current drops to 70μA (Note:C/10 termination is disabled in trickle charging and thermal limiting modes). 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. The 1.8mS filter time (tTEMP) 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 EC49018 terminated 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. Charge status indicator EC49018 has two open-drain status indicator output CHRG and STDBY . CHRG is pull-down when the EC49018 in a charge cycle. In other status CHRG in high impedance. CHRG and STDBY are all in high impedance when the battery out of the normal temperature. Represent in failure state, when TEMP pin in typical connecting, or the charger with no battery: red LED and green LED all don’t light. The battery temperature sense function is disabled by connecting TEMP pin to GND. If battery is not connected to charger, CHRG pin outputs a PWM level to indicate no battery. If BAT pin connects a 10μF capacitor, the frequency of CHRG flicker about 1-4S, If not use status indicator should set status indicator output connected to GND. E-CMOS Corp. (www.ecmos.com.tw) Page 7 of 8 3H20N Rev. P001 1A, Single Cell Linear Lithium Battery Charger EC49018 OUTLINE DRAWING SOP-8(Exposed PAD) E-CMOS Corp. (www.ecmos.com.tw) Page 8 of 8 3H20N Rev. P001