ETA3006 ETA | Alldatasheet
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www.eta-semi.com 1 Empower, Transcend, Achieve! ETA3006 Rev 1.0 Inductive Cell Balancer IC with Balancing Current Up to 2A DESCRIPTION FEATURES ETA3006 is an inductive cell balancer. Unlike conventional passive balancing technique, ETA3006 utilizes a control scheme with an inductor to shuffle currents between two cells until the cells are balanced. Due to the switching nature, the heat and power dissipation generated in conventional linear balance technique are greatly reduced. The balance time is also significantly reduced due to higher balancing current not being limited by pac kage thermal dissipation. ETA3006 consumes only 2µA ultra -low current from batteries in standby mode, extending the battery shelf time. The final balanced voltages of both cells are also highly accurate which enhances the performance and lifetime for the batteries connected in series. ETA3006 can also be used in multiple cells stacking with even number of cells. ETA3006 includes protection features similar to precondition in battery charging, that is when one cell ’s voltage is grossly lower than the other, the balancing current is reduced to a safe level until the lower voltage cell is charged up. ETA3006 is available in ESOP-8 package. Inductive, switching control scheme Up to 90% charger transfer efficiency Accurate balanced voltages down to 10mV Auto detect unbalance and auto balance Low sleeping supply current, 2µA Programmable balancing current up to 2A Precondition balancing current Battery over voltage protection Support small size inductor Pb Free, RoHS and REACH Compliant Halogen Free and “Green” Device
APPLICATIONS
Multi-cells System Battery Pack Portable Equipment and Instrumentation Battery Backup Systems E-Cigarette TYPICAL APPLICATION ETA3006 BATPS BST SW BATN BATC ISET 22uF 22uF 1uH 100nF 10uF 220Ω Rs Li Battery Li Battery BATP 6 TVS TVS 2.2Ω 2.2nF FUSE FUSE Figure 1: Typical Application Circuit
www.eta-semi.com 2 Empower, Transcend, Achieve! ETA3006 Rev 1.0 ORDERING INFORMATION PART No. PACKAGE TOP MARK Pcs/Reel ETA3006S8A SOP8 ETA3006 YWWXL 4000 PIN CONFIGURATION BATN BST ISET SW TEST BATP 4BATPS 5 BATC ETA3006 SOP8 Top View ABSOLUTE MAXIMUM RATINGS (Note: Exceeding these limits may damage the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability.) SW, BATC, BATP to BATN current….Internally limited Thermal Resistance θJC θJA Lead Temperature (Soldering,10sec)……….…260°C ESD CDM (Charged Device Mode)………...…….1KV
ELECTRICAL CHARACTERISTICS
(TA=25 OC, L = 1µH, CBATP-BATN=10µF, CBATP-BATC=22µF, CBATC-BATN=22µF, if not specified) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY ISUPPLY Quiescent current VBATP=8V, VBATP-VBATC=VBATC-VBATN 2 µA Operating supply current VBATP=8V, in balancing mode, No Switching 900 µA VBATP VBATP operating voltage VBATP-VBATC 2.8 5 V VBATC VBATC operating voltage VBATC-VBATN 2.8 5 V UVLO Under lock-out voltage threshold VBATP Rising 3.75 V UVLO_HYS UVLD hysteresis 200 mV DETECTION TSLEEP Detection interval timer Part sleeps during TSLEEP 2 S TALLOW Unbalance detection acknowledgment timer Unbalance status is accepted after TALLOW when enter CHECK state. 3.85 mS TCHECK Maximum unbalance checking timer IC get back to 7.68 mS
www.eta-semi.com 3 Empower, Transcend, Achieve! ETA3006 Rev 1.0 sleeping mode if don’t detect unbalance after TCHECK TDONE Finishing Timer Maximum switching skip before enter sleep mode 62 mS VKICK Unbalance detection threshold Balancing only work if OVP>VBATP>UVLO and VKICK Detected between 2 cells 50 mV VERROR Balancing Accuracy Error voltage between 2 cells after balancing finish -10 10 mV BALANCE CONTROLLER FREQ Switching Frequency PWM Clock 500 kHz IAVERAGE Average Inductor current Regulation RS = 50mΩ 1 A RDS_ON High side switch on Resistance IAVERAGE =2A 40 mΩ Low side switch on Resistance IAVERAGE =2A 40 mΩ BATTERY PROTECTION TOP_OVP Top Cell over voltage protection threshold V(BATP-BATC) Rising 5 V TOP_OVP_HYST TOP_OVP hysteresis V(BATP-BATC) Falling 350 mV BOT_OVP Bottom Cell over voltage protection threshold V(BATC-BATN) Rising 5 V BOT_OVP_HYST BATC_OVP hysteresis V(BATC-BATN) Falling 350 mV TOP_PRECOND Top battery precondition threshold V(BATP-BATC) Rising 2.8 V TOP_PREC_HYST TOP_PRECOND hysteresis V(BATP-BATC) Falling 150 mV BOT_PRECOND Bottom battery precondition threshold V(BATC-BATN) Rising 2.8 V BOT_PREC_HYST BOT_PRECOND hysteresis V(BATC-BATN) Falling 150 mV BALANCE PROTECTION TOP_ILIM Top cell drive current limit RSense = 25mΩ; DOWN direction: V(BATP-BATC)> V(BATC-BATN) 4.5 A BOT_ILIM Lower cell drive current limit RSense = 25mΩ; UP direction: V(BATP-BATC)< V(BATC-BATN) 4.5 A THERMAL SHUTDOWN TSD Thermal shutdown 160 C TSD_HYST TSD Hysteresis 10 C
www.eta-semi.com 4 Empower, Transcend, Achieve! ETA3006 Rev 1.0 PIN DESCRIPTION PIN# NAME DESCRIPTION 1 BATN Negative terminal sense voltage input and common Ground pin. 2 BST Bootstrap pin. Connect a 100nF capacitor from BST to SW.
3 ISET
Balancing current setting pin. Connect a resistor from SW to an inductor to program the balancing current. Under an extremely high noise environment, a 1nF capacitor between ISET pin and SW pin can improve the ISET voltage stability, so a capacitor position reservation here is recommended. 4 BATPS Sense voltage input for top cell. Connect a 10µ F capacitor between BATPS and BATN. 5 BATC Sense voltage input for bottom cell. Connect a 22µ F capacitor between BATC and BATN. 6 BATP Power input from top cell. Connect a 22µ F capacitor between BATP and BATC. 7 TEST Factory Use Only. Float this Pin. 8 SW Switching node. Connected to an inductor. FUNCTIONAL BLOCK DIAGRAM ETA3006 Bandgap & VDD & BIAS & OVP & TSD 1uA UVLO Timer Control Balance Current Sense Battery Sense VDD ISET BATPS Balance Control BATC BST SW BATN BATP Figure 2: Functional Block Diagram
www.eta-semi.com 5 Empower, Transcend, Achieve! ETA3006 Rev 1.0 TYPICAL PERFORMANCE CHARACTERISTICS (TA=25C, unless otherwise specified) 0 2 4 6 8 IQ(uA) VTOP(V) IQ Vs. VBATP Vtop=Vbot 500 1000 1500 2000 2500 3000 0 10 20 30 40 50 60 Average Inductor Current(mA) Rs(mΩ) Average Inductor Current Vs. Rs DOWN：VTop=4.2V,VBot=4V UP：VBot=4.2V,VTop=4V 0.2 0.4 0.6 0.8 1.2 0.5 1.5 2.5 3.5 4.5 Rs=25mΩ,Vbatp=4.2V Ichrg(A) Voltage (V) VTOP(V) Out Voltage VS VTOP VBATP(V) VBATC(V) IBATP(A) IBTAC(A) 0.2 0.4 0.6 0.8 1.2 Rs=25mΩ,Vbatc=4.2V Ichrg(A) Voltage (V) VBOT (V) Out Voltage VS VBOT VBATC(V) VBATP(V) IBATP(A) IBTAC(A) -2.2 -1.8 -1.6 -1.4 -1.2 -0.8 -0.6 -0.4 -0.2 0.2 0.4 0.6 0.8 1.2 1.4 1.6 1.8 3.3 3.4 3.5 3.6 3.7 3.8 3.9 0.1 1 10 100 1000 IBAT(A) VBAT (V) Time(minutes) Balancing without Charger vbatp(v) vbatc(v) ibatp(A) ibatc(A)
www.eta-semi.com 6 Empower, Transcend, Achieve! ETA3006 Rev 1.0 TYPICAL PERFORMANCE CHARACTERISTICS Cont’d (TA=25C, unless otherwise specified) Power on VBATP VBATP=4.2V VBATC = 3.7V RS = 25mΩ Power on VBATC VBATP=3.7V VBATC = 4.2V RS = 25mΩ Power Off VBATP VBATP=4.2V VBATC = 3.7V RS = 25mΩ Power on VBATC VBATP=3.7V VBATC = 4.2V RS = 25mΩ VTOP plug-out, DOWN Condition, RS = 25mΩ, VTOP = 4.3V, VBOT = 3.5V VBOT plug-out, DOWN Condition, RS = 25mΩ, VTOP = 4.3V, VBOT = 3.5V
www.eta-semi.com 7 Empower, Transcend, Achieve! ETA3006 Rev 1.0 TYPICAL PERFORMANCE CHARACTERISTICS Cont’d (TA=25C, unless otherwise specified) VTOP plug-out, UP Condition, RS = 25mΩ, VBOT = 4.3V, VTOP = 3.5V VBOT plug-out, UP Condition, RS = 50mΩ, VBOT = 4.3V, VTOP = 3.5V FEATURE DESCRIPTION The ETA3006 is a battery cell balancer with lossless inductive architecture based on ETA ’s proprietary technology. The technology is developed by ETA Solutions and any copy without ETA’s agreement will be forbidden. During operation, ETA3006 detects the difference between 2 cells then start balancing if the difference exceeds VKICK. Once detected VKICK, ETA3006 will discharge the higher voltage cell, store that discharging energy in the inductor then charge that energy to the lower voltage cell. ETA3006 keeps balancing until there is no difference between 2 cells. ETA3006 technology allows balancing in either charge or discharge phases of t he battery with minimized loss. Without unbalanced condition, ETA3006 operates in sleep mode with low supply current. This is an advantage to extend battery pack life time. STATE MACHINE The ETA3006 provides a completed state machine that controls whole operation intelligently. With this state machine, ETA3006 is equipped with self -protection from any accident during balancing. It also keeps the part stay asleep as much as possible until unbalance detected. ETA3006 always starts from CHECK state when battery is plugged in. Any fault always forces ETA3006 back to SLEEP State where ETA3006 burns only 2µA (typically) from BATP.
www.eta-semi.com 9 Empower, Transcend, Achieve! ETA3006 Rev 1.0 SLEEP State. PROTECTION ETA3006 provides full protection to batteries that extend the life time of the batteries: ➢ Short and Low Voltage Protection: When either of the cell voltage below V PRECOND, maximum balancing current will be re-defined to 10% of the level set by ISET pin resistor. ➢ Open and Over Voltage Protection: When either of the cell voltage is greater than VOVP, ETA3006 will stop balancing, and go back to SLEEPING. Part will wake up after TSLEEP. ➢ Thermal Shutdown: When part get s hotter than 160oC, ETA3006 will stop balancing, and go back to SLEEPING. Part will wake up after TSLEEP. ➢ Current Limit Protection: Maximum of the peak of inductor current is allowed to 5.5A .
APPLICATION INFORMATION
Balancing current is defined as the average inductance current. Average inductance current is regulated following ISET resistor configuration. AVERAGE INDUCTION CURRENT RECOMMENDED COMPONENT ISET RESSITOR INDUCTOR BATTERY CAPACITOR 500mA 100mΩ 1µH CBATP-BATN=10µF CBATP-BATC=22µF CBATC-BATN=22µF 625mA 80mΩ 800mA 62.5mΩ 1000mA 50mΩ 1250mA 40mΩ 1515mA 33mΩ 1667mA 30mΩ 2000mA 25mΩ RESTRICTED CONDITIONS ETA3006 does not allow following restricted conditions: ➢ Short SW to ISET ➢ Exceed the absolute maximum rating of each IC pin MULTI-CELLS BALANCING SOLUTION It is also possible to use several ETA3006 ICs in application to balance multi -cell series battery, such as shown in the Figure 6 (n cells). Each ETA3006 manages balancing of 2 neighbor cells. Each ETA3006 operates independently.
www.eta-semi.com 10 Empower, Transcend, Achieve! ETA3006 Rev 1.0 ETA3006 BATPS BST SW BATN BATC ISET 22uF 22uF 1uH 100nF 10uF 220Ω Rs Cell 1 ETA3006 BATPS BST SW BATN BATC ISET 22uF 1uH 100nF 10uF 220Ω Rs Cell 2 ETA3006 BATPS BST SW BATN BATC ISET 22uF 22uF 1uH 100nF 10uF 220Ω Rs Cell 3 Cell n-1 Cell nBATP 6 BATP 6 BATP 6 TVS TVS TVS TVS TVS 2.2Ω 2.2nF FUSE FUSE 2.2Ω 2.2nF FUSE 2.2Ω 2.2nF FUSE FUSE Figure 6: Multi -Cells Balancing Solution
www.eta-semi.com 11 Empower, Transcend, Achieve! ETA3006 Rev 1.0 PCB DESIGN GUIDELINE In an UP case that bottom cell voltage is greater than top cell voltage, bottom cell becomes input and top cell becomes output of the switching regulation. In a DOWN case that top cell voltage is greater than bottom cell voltage, top cell becomes input and bottom cell becomes output. These mean parallel battery capacitors are always output capacitor or input capacitor for regulator. So please require to locate as close as possible to IC pins to minimize series resistance. Please try to get the order of battery pins are BATP – BATC – BATN to make an easy battery connection. Via( 0.4*0.6mm ) Top Layer Bottom Layer Figure 7: PCB Layout Guideline
www.eta-semi.com 12 Empower, Transcend, Achieve! ETA3006 Rev 1.0 PACKAGE OUTLINE
www.eta-semi.com 13 Empower, Transcend, Achieve! ETA3006 Rev 1.0 TAPE AND REEL INFORMATION Device Package Type Pins SPQ Reel Diameter （mm） Reel Width W1 （mm） (mm) (mm) (mm) P (mm) W (mm) Pin1 Quadrant ETA3006S8A SOP8 8 4000 330 12.7 6.6 5.4 2.05 8 12 Q1