EC49022 E-CMOS | Alldatasheet
Document overview
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Technical content
Features
Programmable Charge Current Up to 1000mA No MOSFET, Sense Resistor or Blocking Diode Required Complete Linear Charger in SOP-8 Package for Single Cell Lithium-Ion Batteries Constant-Current/Constant-Voltage Preset 4.3V Charge Voltage with ±1% Accuracy Automatic Recharge Two Charge Status Output Pins C/10 Charge Termination 2.9V Trickle Charge Threshold Soft-Start Limits Inrush Current Battery Temperature monitor
Applications
Cellular Telephones, PDA, MP3 Players Charging Docks and Cradles MP3、MP4 Player Digital Still Cameras, Portable Devices USB Bus-Powered Chargers, Chargers Application Diagram
1A, Single Cell Linear Lithium Battery Charger EC49022 Pin Functions Pin Pin Function Description Pin Pin Function Description TEMP Connecting TEMP pin to NTC thermistor’s output in Lithium ion battery pack. Terminate Charge when TEMP<45%Vcc or TEMP>80%Vcc. The function disable when TEMP connect to GND, but other function is work. BAT Connect the positive terminal of the battery to BAT pin PROG Constant charge current setting and charge current monitor pin STDBY Charge completely Status Output, The status is Low Level when charge completely. Other status is high-impedance. GND Ground pin CHRG Charging Status Output, The status is low level when charging, other status is high-impedance. VCC Input Voltage pin CE Chip Enable Input
Ordering Information
Package Part Number Marking Marking Information SOP-8 (Exposed PAD) EC49022NNMHR 49022 LLLLL YYWWT 1. LLLLL：Lot No. 2. YYWW：date Code 3. T：Internal Tracking Code Pin Configuration
1A, Single Cell Linear Lithium Battery Charger EC49022 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 1200 mA PROG Pin Current IPROG 1200 uA Maximum Junction Temperature TJ 150 °C Operating Rating Parameter Symbol Value Units Operating Temperature TA -20 to +85 °C Storage Temperature TSTG -40 to +125 ℃ Lead Temperature ( Soldering, 10sec) TLED 260 ℃ Block Diagram
1A, Single Cell Linear Lithium Battery Charger EC49022
Electrical Characteristics
VIN = 5V; TA = 25°C; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit VCC Input Supply Voltage 4.0 5 6.5 V ICC Input Supply Current Charge Mode, RPROG = 2K — 146 — µA Standby Mode (Charge Terminated) — 70 — µA Shutdown Mode(RPROG Not Connected, VCC < VBAT, or VCC < VUV) — 30 — µA VFLOAT Regulated Output Voltage IBAT = 30mA, RPROG = 10K 4.3 4.34 4.38 V IBAT BAT Pin Current (Current mode test condition VBAT=4V) 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 ITRIKL Trickle Charge Current VBAT < VTRIKL, RPROG = 2K — 60 — mA VTRIKL Trickle Charge Threshold Voltage RPROG = 2K, VBAT Rising 2.8 2.9 3.0 V VTRHYS Trickle Voltage hysteresis Voltage RPROG=2K — 100 — mV VUV VCC Undervoltage Lockout Threshold From VCC Low to High — 3.7 — V VUVHYS VCC Undervoltage Lockout Hysteresis — 150 — mV VASD VCC – VBAT Lockout Threshold Voltage Vcc from Low to High — 150 — mV Vcc from High to Low — 100 — mV ITERM C/10 Termination Current Threshold RPROG = 2K — 60 — mA RPROG = 1K — 100 — mA VPROG PROG Pin Voltage RPROG = 2k, Current Mode 0.9 1.0 1.1 V CHRG Pin Output Low Voltage CHRGI = 5mA — — 0.4 V STDBYV STDBY Pin Output Low Voltage STDBYI =5mA — — 0.4 V VTEMP-H TEMP pin voltage of the high-end flip — 80 — %Vcc
1A, Single Cell Linear Lithium Battery Charger EC49022 VIN = 5V; TJ = 25°C; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit VTEMP-L TEMP pin voltage of the low-end flip — 45 — %Vcc ΔVRECHRG Recharge Battery Threshold Voltage VFLOAT - VRECHRG — 150 — mV TLIM Thermal Protection Temperature — 145 — °C 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 Complete Charge Cycle (1000mAh Battery) The EC49022 is a complete constant –current & constant-voltage linear charger for single cell l ithium-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. EC49022 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 EC49022 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 EC49022 or the external components. Another benefit of adopting thermal regulation is that charge Typical Performance Characteristics
1A, Single Cell Linear Lithium Battery Charger EC49022 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 3V, 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 rise s above 3 V. In constant current mode, the charge current is set by R PROG. When the battery appro aches the regulation voltage 4. 3V, the charge current begins to decrease as the EC49022 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 1μA. 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 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 --- ---
1A, Single Cell Linear Lithium Battery Charger EC49022 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 t TEMP (typically 1.8mS), Charging is terminated. The charge current is latched off and the EC49022 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 1/10 th the programmed value. The 1.8mS filter time (t TEMP) 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 1/10 th the programmed value, the EC49022 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 EC49022 has two open-drain status indicator output CHRG and STDBY . CHRG is pull-down when the EC49022 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.
1A, Single Cell Linear Lithium Battery Charger EC49022 OUTLINE DRAWING SOP-8(Exposed PAD)