ETA4056 ETA | Alldatasheet
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www.etasolution.com 1 Empower, Transcend, Achieve! 1.2A/16V Fully Integrated Linear Charger for 1 Cell Li-ion Battery DESCRIPTION FEATURES ETA4056 is a single cell, fully integrated constant current (CC)/constant voltage (CV) Li -ion battery charger. Its compact package with minimum external components requirement makes the ETA4056 ideal for portable applications. No external sense resistor or blocking diode is necessary for the ETA4056. Build -in thermal feedback mechanism regulates the charge current to control the die temperature during high power operation or at elevated ambient temperature. The ETA4056 has a pre -charge function for trickle charging deeply discharged batteries. The fast charge current can be programmed by an external resistor. CV regulation mode is automatically enabled once the battery’s charging curve reaches the constant voltage portion. The output current then decays and is finally terminated once the charge current drops to 1/10th of the programmed value. The ETA4056 keeps monitoring the battery voltage and enables a new charge cycle once the voltage drops by 120mV below the CV value. ETA4056 is in an ESOP8, DFN2x2 -8, DFN2x3-8, and SOT23-6 package. 16V input standoff voltage 4.2V charge termination voltage 2.9V trickle charge threshold Charge current programmable, up to 1.2A 250nA BAT current when no charging Soft-start limits in-rush current ESOP8 / DFN2x2-8 / DFN2x3-8 / SOT23-6
APPLICATIONS
E-cigarette Toys Bluetooth applications Li-ion battery powered devices TYPICAL APPLICATION VIN EN RISET VBAT/ VSYS VIN STAT STDBY EN GND ISET NTC BAT Li+ Battery * STDBY , NTC and EN pins are not available on SOT23-6 package ETA40564.7uF 1K 1uF
www.etasolution.com 2 Empower, Transcend, Achieve! ORDERING INFORMATION PART No. PACKAGE TOP MARK Pcs/Reel ETA4056E8A ESOP8 ETA4056 YWW2L 4000 ETA4056D2I DFN2x2-8 ELYW 3000 ETA4056D6I DFN2x3-8 ELYW 3000 ETA4056S2G SOT23-6 B1YW 3000
ELECTRICAL CHARACTERISTICS
(VIN = 5V, unless otherwise specified. Typical values are at TA = 25oC.) PARAMETER CONDITIONS MIN TYP MAX UNITS Input Standoff Voltage 16 V Input Over-Voltage Protection Voltage VIN rising, hys=0.3V 6.5 7 7.4 V Input Voltage Range for Charging 4.25 6 V Input Supply Current Charge Mode 300 2000 μA Standby Mode (Charge Terminated) 65 100 μA Shutdown Mode (ISET Not Connected, EN=0, VIN<VBAT, or VIN<VULO) 25 50 μA Regulated Output (Float) Voltage Riset = 10K, IBAT = 40mA 4.16 4.2 4.24 V BAT Pin Current Riset = 10K, Current Mode 90 100 110 mA Riset = 2K, Current Mode 432 480 528 mA PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS NTC ISET GND EN STAT STDBY ESOP- 8 4VIN 5 BAT ETA4056 DFN2x2 - 8 ETA4056 VIN STDBY STAT EN BAT ISET NTC GND DFN 2x3 - 8 ETA4056 VIN STDBY STAT EN BAT ISET NTC GND STAT GND BAT ISET GND VIN ETA4056 SOT23- 6 (Note: Exceeding these limits may damage the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability.) Thermal Resistance ΘJC ΘJA
www.etasolution.com 3 Empower, Transcend, Achieve! PARAMETER CONDITIONS MIN TYP MAX UNITS Riset = 1K, Current Mode 820 920 1020 mA Standby Mode, VBAT = 4.2V From battery to BAT Pin 2 3 μA Shutdown Mode, ISET Not Connected From battery to BAT Pin 0 0.25 0.35 μA Sleep Mode, VIN = 0V From battery to BAT Pin 0 0.25 0.35 μA Trickle Charge Current VBAT < VTRIKL, Rset = 2K 20 50 110 mA Trickle Charge Threshold Voltage VBAT Rising 2.75 2.93 3.1 V Trickle Charge Hysteresis Voltage 100 130 165 mV VIN Under-voltage Lockout Threshold From VIN Low to High 3.05 3.35 3.6 V VIN Under-voltage Lockout Hysteresis 0.4 0.55 0.65 V EN Pull-Up Current 0.5 1 μA Enable Charger EN Pin Rising 1.6 V Disable Charger EN Pin Falling 0.6 V VIN–VBAT Lockout Threshold Voltage VIN from Low to High 50 100 140 mV VIN from High to Low 5 30 mV C/10 Termination Current Threshold 0.085 0.1 0.115 mA/mA ISET Pin Voltage Current Mode, VBAT=4V 1 V STAT/STDBY Pin Weak Pull-Down Current V_STAT = 5V 0.1 μA STAT/STDBY Pin Output Low Voltage I_STAT or I_STDBY= 5mA 0.35 0.6 V Recharge BAT Threshold Voltage VFLOAT - VRECHRG 90 120 150 mV Junction Temperature in Constant Temperature Mode 120 °C Power FET “ON” Resistance (Between VCC and BAT) 0.5 ohm Soft-Start Time IBAT=0 to IBAT=1000V/RSET 100 μs Termination Comparator Filter Time IBAT Falling Below ICHG/10 400 1000 2500 μs ISET Pin Pull-Up Current 1 μA NTC Threshold, Cold Charger Suspended 77 80 81 % VIN NTC Threshold, Hot Charger Suspended 43 45 46.5 % VIN NTC Threshold Hysteresis 2 % VIN NTC Disable Threshold Tie NTC to GND NTC Input Leakage 0 1 μA
www.etasolution.com 4 Empower, Transcend, Achieve! PIN DESCRIPTION ESOP8 PIN # DFN2x2-8 PIN# DFN2x3-8 PIN# SOT23-6 PIN# NAME DESCRIPTION 1 6 6 NA NTC Battery Temperature Monitoring input pin. It sets the valid temperature operating range for both battery charging and discharging. 2 7 7 6 ISET Program, Monitor the charge current and Shutdown. This pin set to 1V in constant -current mode. The charge current is programmed by connecting a 1% resistor (Rset), between ISET, to GND pin. The charge current can be calculated using the following formula: IBAT= 1 Rset ×1000-( 1 3.6 × 1 Rset ×1000) The ISET pin can also be used to switch the charger to shutdown mode by disconnecting the program resistor from ground. 3 5 5 2 GND Ground. 4 1 1 4 VIN Positive Input Supply. Needs to be bypassed with at least a 4.7μF capacitor. 5 8 8 3 BAT Charge Current Output. This pin provides charge current to the battery and regulates the final float voltage to 4.2V which is set by an internal precision resistor divider. 6 2 2 NA STDBY Open-Drain Output for Charge Finished flag. The STDBY pin outputs low when the battery is finished charging. When in the status of charging, it becomes high-impendence. 7 3 3 1 STAT Open-Drain Output for In Charging flag, The STAT pin outputs low when the battery is in charging. Upon the completion of the charge cycle, it becomes high - impendence. 8 4 4 NA EN Enable the IC charger or not. Drive this pin high or floating to enable charger, low to disable.
www.etasolution.com 5 Empower, Transcend, Achieve! FUNCTION BLOCK DIAGRAM\\ TA TTEMP TTEMP Schmitt CA MA VA 120 TDIE 80%VIN 45%VIN NTC EN REF 1.17V ISET STDBY STAT GND BAT VIN SHDN RISET 2.9V BAT 1μA FUNCTIONAL DECRIPTIONS The ETA4056 is a single cell, fully integrated constant current (CC)/constant voltage (CV) Li-ion battery charger. It can deliver up to 1200mA of charge current with a final float voltage accuracy of 1%. The ETA4056 has a build-in thermal regulation circuitry that ensures its safe operation. No blocking diode or external current sense resistor is required; hence reduce the external components for a basic charger circuit to two. The ETA4056 is also capable of operatin g from a USB power source. Normal Charge Cycle The ETA4056 initiates a charge cycle once the voltage at the V IN pin rises above the UVLO threshold level. A 1% precision resistor needs to be connected from the ISET pin to ground. If the voltage at the BAT pin is less than 2.9V, the charger enters trickle charge mode. In this mode, the charge current is reduced to n early 1/10 the programmed value until the battery voltage is raised to a safe level for full current charging. The charger switches to constant -current mode as the BAT pin voltage rises above 2.9V, the charge current is thus
www.etasolution.com 6 Empower, Transcend, Achieve! resumed to full programmed value. When the final float voltage (4.2V) is reached, the ETA4056 enters constant-voltage mode and the charge current begins to decrease until it drops to 1/10 of the preset value and ends the charge cycle. Programming Charge Current The charge current is programmable by setting the value of a precision resistor connected from the ISET pin to ground. The charge current is 1000 times of the current out of the ISET pin. 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= 1 Rset ×1000-( 1 3.6 × 1 Rset ×1000) Charge Termination The ETA4056 keeps monitoring the ISET pin during the charging process. It terminates the charge cycle when the charge current falls to 1/10 the programmed value after the final float voltage is reached. 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 ETA4056 enters standby mode, where the input supply current drops to 200μA. (Note: C/10 termination is disabled in trickle charging and thermal limiting modes). During charging, the transient response of the circuit can cause the ISET pin to fall below 100mV temporarily before the battery is fully charged, thus can cause a premature termination of the charge cycle. A 1ms filter time on the termination comparator can prevent this from happening. On ce the average charge current drops below 1/10 the programmed value, the ETA4056 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 ETA4056 constantly monitors the BAT pin voltage in standby mode and resume another charge cycle if this voltage drops below the recharge threshold. User can also manually restart a charge cycle in standby mode either by removing and then reapplied the input voltage or restart the charger using the ISET pin. Charge Status Indicator (STAT and STDBY pin) There are 2 different states of the charge status, one is IN CHRGING, and the other is CHARGING FINISHED. STAT is the pin to pull low during IN CHARGING status and become high impedance in CHARGING FINISHED status. And STDBY pin just works the opposite way, pulling low after charge finished, and high impedance when in charging. Table 1:Charger Status Indication Charger Status STAT STDBY Charging Low Hi-Z End of charge,ISET disable charger only Hi-Z Low Vin OVP ,NTC fault Hi-Z Hi-Z No BAT/w BAT Pin has Cap(NTC Pin float/GND) Blinking,(depend on Cap) Low No BAT/w BAT Pin has no Cap(NTC Pin float/GND) Blinking Hi-Z
www.etasolution.com 7 Empower, Transcend, Achieve! High Temperature Fold-back Build-in feedback circuitry mechanism can reduce the value of the programmed charge current once the die temperature tends to rise above 50° C, hence prevents the temperature from further increase and ensure device safe operation. Under-voltage Lockout (UVLO) Build-in under-voltage lockout circuit monitors the input voltage and keeps the charger in shutdown mode until V IN rises above the under-voltage lockout threshold. The UVLO circuit has a built-in hysteresis of 500mV. Furthermore, to protect against reverse current in the power MOSFET, the UVLO circuit keeps the charger in shutdown mode if V IN falls to within 30mV of the battery voltage. If the UVLO comparator is tripped, the charger will not come out of shutdown mode until VIN rises 100mV above the battery voltage. Manual Shutdown There are two methods can disable the IC charger: 1. Driver the EN pin to low. 2. Floating the ISET pin by removing the resistor from ISET pin to ground. Once one of above conditions happen can put the device in shutdown mode. The battery drain current is thus reduced to 250nA and the supply current to <50μA. Reconnecting the resistor back or driver EN pin high will restart a new charge cycle. Automatic Recharge After the termination of the charge cycle, the ETA4056 constantly monitors the BAT pin voltage and starts a new charge cycle when the battery voltage falls below 4.08V, keeping the battery at fully charged condition. ISET pin output enters a strong pull-down state during recharge cycles. Battery Temperature Monitoring ETA4056 continuously monitors temperature by measuring the voltage of NTC pin. A negative or positive temperature coefficient thermistor and an external voltage divider typically develop this voltage. ETA4056 compares this voltage against its internal 80%VIN and 45%VIN thresholds to determine if charging is allowed. The temperature sensing circuit is immune to any fluctuation in VIN, since both the external voltag e divider and the internal thresholds 80%VIN and 45%VIN are referenced to VIN. If the NTC pin is connected to GND will disable the temperature-sensing feature.
www.etasolution.com 8 Empower, Transcend, Achieve! PACKAGE OUTLINE RECOMMENDED LAND PATTERN
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www.etasolution.com 10 Empower, Transcend, Achieve! PACKAGE OUTLINE (cont’) From assembly house 1 : From assembly house 2 ： RECOMMENDED LAND PATTERN
www.etasolution.com 11 Empower, Transcend, Achieve! PACKAGE OUTLINE (cont’)
www.etasolution.com 12 Empower, Transcend, Achieve! TAPE AND REEL INFORMATION