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EUP8020X Dual Source AC/USB Li-Ion/Polymer Charger IC for Portable Applications
DESCRIPTION
The EUP8020X series are highly integrated single cell Li-Ion/Polymer battery charger IC designed for handheld devices. The EUP8020X accepts two power inputs, normally one from a USB port and another one from AC-adaptor. The EUP8020X automatically selects the USB-Port or the AC-adapter as the power source for the system. In the USB configuration, the host can select from the two preset charge rates of 100 mA and 500 mA. In the AC-adapter configuration an external resistor sets the magnitude of the charge current, which may be programmed up to 1A. The EUP8020X charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on minimum current. An internal charge timer provides a backup safety for charge termination. The EUP8020X automatically re-starts the charge if the battery voltage falls below an internal threshold. The EUP8020X also automatically enters sleep mode when both supplies are removed. No external sense resistor or blocking diode is required for charging. The EUP8020X integrates internal power FET , current sensor, charge status and reverse current protection in a single monolithic devices.
FEATURES
Charges Single Cell Li-Ion/Polymer from Either AC Adapter or USB With Autonomous Power-Source Selection Integrated Power FET and Current Sensor for Up to 1A Charge Applications From AC Adapter Integrated USB Control With Selectable 100 mA and 500 mA Charge Rates Precharge Conditioning With Safety Timer Power Good (AC Adapter Present) Status Output Optional Battery Temperature Monitoring Before and During Charge Automatic Sleep Mode for Low-Power Consumption Available in TDFN-10 Package RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
Smartphones Digital Cameras PDAs/ MP3 Players Other Battery-Powered Devices
Typical Application Circuit
Figure 1. EUP8020A
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Block Diagram
Figure 2.
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Pin Configurations
Package Type Pin Configurations Package Type Pin Configurations
EUP8020A/E TDFN-10
EUP8020B TDFN-10
EUP8020C TDFN-10
EUP8020D TDFN-10
EUP8020F TDFN-10
EUP8020G TDFN-10
Pin Description
PIN AC USB STAT1 STAT2 VSS ISET1 ISET2
CE
A,E 1 2 3 4 5 6 7 8 9 10 -
B 1 2 3 4 5 6 7 9 10 8 -
C 1 2 3 4 5 6 7 8 10 9
D 1 2 3 4 5 6 7 9 10 8
F 1 2 3 4 5 6 7 9 10 8 -
G 1 2 7 6 3 8 4 5 9 10 -
I/O I I O O I I I I O O I I AC charge input voltage
DESCRIPTION USB charge input voltage Charge status output 1 (open-drain) Charge status output 2 (open-drain) Ground input Charge current set point for AC input and precharge and taper set point for both AC and USB Charge current set point for USB port (high=500 mA, Low=100 mA, hi-z=disable USB charge) Charge enable input (active low) Temperature sense input Charge current output Powergood status output (active low) Timer enable input (active low) Timer and termination enable input (active low)
TS OUT
PG
TE TTE
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Ordering Information
Order Number EUP8020A-JIR1 EUP8020B-JIR1 EUP8020C-JIR1 EUP8020D-JIR1 EUP8020E-JIR1 EUP8020F-JIR1 EUP8020G-JIR1 Package Type TDFN-10 TDFN-10 TDFN-10 TDFN-10 TDFN-10 TDFN-10 TDFN-10 Marking xxxxx 8020A xxxxx 8020B xxxxx 8020C xxxxx 8020D xxxxx 8020E xxxxx 8020F xxxxx 8020G Operating Temperature range -20 C to 70C -20 C to 70C -20 C to 70C -20 C to 70C -20 C to 70C -20 C to 70C -20 C to 70C
EUP8020X- 1/4
1/4
1/4
1/4
Lead Free Code 1: Lead Free 0: Lead Packing R: Tape& Reel Operating temperature range I: Industry Standard Package Type J: TDFN-10
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Absolute Maximum Ratings
Input voltage(AC, CE ,ISET1,ISET2,OUT, PG ,STAT1,STAT2, TE , TS, TTE ,USB) -------- 0.3V to 6V Output sink / source current (STAT1,STAT2, PG ) ---------------------------------------------------- 15mA Output current (TS ) --------------------------------------------------------------------------------------- 200g A Output current (OUT) ------------------------------------------------------------------------------------- 1.5 A Junction temperature range, TJ ------------------------------------------------------------------------- 150C Storage temperature range, Tstg ------------------------------------------------------------- -65C to 150C Lead temperature (soldering, 10s) -------------------------------------------------------------------260C
Dissipation Ratings Package
TDFN-10
c
JA
TA < 40C
Power Rating 1.5W
48C/W
Derating Factor Above TA =25C 0.0208 W/C
Recommended Operating Conditions (1) Min.
Supply voltage (from AC input), VCC Supply voltage (from USB input), VCC Operating junction temperature range, TJ 4.5 4.35 -40
Max.
5.5 5.5 125
Unit
V V C
Electrical Characteristics over Recommended Operating Free-Air Temperature Range Parameter
Input Current VCC current, ICC(VCC) Sleep current, ICC(SLP) Standby current, ICC(STBY) Voltage Regulation Output voltage, VO(REG) Voltage regulation accuracy AC dropout voltage (V(AC)-V(OUT)), V(DO) TA = 25C VO(OUT) = VO(REG), IO(OUT) = 1A -0.5% -1.5% 400 400 100 4.2 0.5% 1.5% 500 500 150 mV V VCC > VCC(min) Sum of currents into OUT pin, VCC < V(SLP) CE = High, 0C TJ 85C 0.9 1 50 1.5 5 150 mA A
Conditions
EUP8020X Unit Min. Typ. Max.
USB dropout voltage (V(USB) - V(OUT)), VO(OUT) = VO(REG) ISET2 = High V(DO) VO(OUT) = VO(REG) ISET2 = Low
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Electrical Characteristics Over Recommended Operating Free-Air Temperature Range Parameter
Current Regulation AC output current range, IO(OUT) (1) USB output current range, IO(OUT) Output current set voltage, V(SET) Output current set factor, K(SET) VI(OUT) >V(LOWV), VCC 4.5 V VI(OUT) >V(LOWV), VCC 4.5 V ISET2 = Low VI(OUT) >V(LOWV), VCC 4.5 V ISET2 = High Voltage on ISET1 pin, VCC 4.5 V, VI(OUT) > V(LOWV), 50 mA IO(OUT) 1 A 10 mA IO(OUT) < 50 mA 1 mA IO(OUT) < 10 mA Precharge and Short-Circuit Current Regulation Precharge to fast-charge transition Voltage on OUT pin threshold, V(LOWV) Deglitch time for fast-charge to precharge transition Precharge range, IO(PRECHG) (2) 0 V < VI(OUT) < V(LOWV) Voltage on ISET1 pin, Precharge set voltage, V(PRECHG) 0 V < VI(OUT) > V(LOWV) Charge Taper and Termination Detection Charge taper detection range, VI(OUT) > V(RCH) I(TAPER) (3) USB-100 charge taper detection level VI(OUT) > V(RCH), ISET2 = Low 8020F USB-500 charge taper detection level VI(OUT) > V(RCH), ISET2 = High 8020F Voltage on ISET1 pin, VO(REG) = 4.2V, Charge taper detection set voltage, V(TAPER) VI(OUT) > V(RCH) Voltage on ISET pin, VO(REG) = 4.2V, Charge termination detection set voltage, V(TERM) (4) VI(OUT) > V(RCH) Deglitch time for TAPER detection, tTPRDET Deglitch time for termination detection, tTRMDET Temperature Sense Comparator Low-voltage threshold, V(LTF) High-voltage threshold, V(HTF) Current source, I(TS) Deglitch time for temperature fault, t(DEGL) 50 80 400 2.410 304 294 246 2.460 320 320 320 1000 100 500 2.510 336 346 416 V mA
Conditions
EUP8020X Unit Min. Typ. Max.
2.8 250 5 230
3.0 375
3.2 500 100
V ms mA mV
245
260
5 6.5 32 235 11 250 250 9 44 250 18 375 375
100 11 55 265 mV 25 500 ms 500 mA
2.49 0.495 102 250
2.515 0.510 112 375
2.54 0.525 122 500
V A ms
K (SET) x V(SET) (1) I O(OUT) = R SET

K (SET) x V(PRECHG) (2) I O(PRECHG) = R SET

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Parameter
Battery Recharge Threshold Recharge threshold, VRCH VO(REG) VO(REG) VO(REG) -0.10 -0.050 -0.150 V ms
Conditions
EUP8020X Unit Min. Typ. Max.
Deglitch time for recharge detect, 250 375 500 t(DEGL) STAT1, STAT2, and PG Outputs Low-level output saturation voltage, IO = 5 mA 0.25 VOL ISET2, Charge Enable ( CE ), Timer and Termination Enable ( TTE ), and Timer Enable ( TE ) Inputs Low-level input voltage, VIL High-level input voltage, VIH CE , TE or TTE low-level input current, IIL CE , TE or TTE high-level input current, IIH ISET2 low-level input current, IIL ISET2 high-level input current, IIH ISET2 high-Z input current, IIH Timers Precharge time, t(PRECHG) Taper time, t(TAPER) Charge time, t(CHG) Timer fault recovery current, I(FAULT) Sleep Comparator Sleep-mode entry threshold voltage, V(SLP) Sleep mode exit threshold voltage, V(SLPEXIT) Sleep mode deglitch time Thermal Shutdown Thresholds Thermal trip threshold, T(SHTDWN) Thermal hysteresis Undervoltage Lockout Undervoltage lockout V(UVLO) Hysteresis (3) Decreasing VCC 2.2 2.4 20 (4) 2.6 165 30 2.3 V VI(OUT) VO(REG) 2.3 V VI(OUT) VO(REG) 8020A,8020B,8020C,8020D, 8020E,8020G 8020A,8020B,8020C,8020D,8020G 8020E,8020F 1,650 1,650 16,500 23,080 1,940 1,940 2,230 2,230 IIL = 10 A IIL = 20 A 0 1.4 -1 1 IISET2 = 0 IISET2 = VCC -20 40 1 0.4
V
V
A
V
s s A
19,400 22,300 27,160 31,235 200
VCC VI(OUT) +100 mV VCC VI(OUT) +190mV 250 375 500
V ms
C
V mV
K (SET) x V(TAPER ) I O(TAPER ) = R SET
K (SET) x V(TERM) I O(TERM) = R SET
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Application Information
Figure 3. Operational Flow Chart
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Functional Description Autonomous Power Source Selection As default the EUP8020X attempts to charge from the AC input. If AC input is not present, the USB is selected. If both inputs are available, the AC adapter has the priority. See Figure 4 for details. The EUP8020X activates a safety timer, t(PRECHG), during the conditioning phase. If V(LOWV) threshold is not reached within the timer period, the EUP8020X turns off the charger and enunciates FAULT on the STATx pins. Please refer to the Timer Fault Recovery section for additional details.
Figure 4.Typcial Charging Profile Temperature Qualification ( 8020A,8020D,8020E,8020F,8020G Only) The EUP8020X continuously monitors battery temperature by measuring the voltage between the TS and VSS pins. An internal current source provides the bias for most common 10-k[ negative-temperature coefficient thermistors (NTC) (see Figure 5). The device compares the voltage on the TS pin against the internal V(LTF) and V(HTF) thresholds to determine if charging is allowed. Once a temperature outside the V(LTF) and V(HTF) thresholds is detected the device immediately suspend the charge. The device suspend charge by turning off the power FET and holding the timer value (i.e. timers are NOT reset). Charge is resumed when the temperature returns to the normal range. However the user may modify these thresholds by adding two external resistors. See Figure 6. Battery Pre-Conditioning During a charge cycle if the battery voltage is below the V(LOWV) threshold, the EUP8020X applies a precharge current, IO(PRECHG), to the battery. This feature revives deeply discharged cells. The resistor connected between the ISET1 and VSS, RSET, determines the precharge rate. The V(PRECHG) and K(SET) parameters are specified in the specifications table. Note that this applies to both AC and USB charging.
I O(PRECHG) =
V(PRECGH ) x K (SET ) R SET
Figure 5. Temperature Sensing Configuration
Figure 6. Temperature Sensing Thresholds
Battery Charge Current The EUP8020X offers on-chip current regulation with programmable set point. The resistor connected between the ISET1 and VSS, RSET, determines the AC charge rate. The V(SET) and K(SET) parameters are specified in the specifications table.
V(SET ) x K (SET ) R SET
I O(OUT) =
---------------------- (2)
------------ (1)
When charging from a USB port, the host controller has the option of selecting either 100 mA or 500 mA charge rate using ISET2 pin. A low-level signal sets current at 100 mA and a high level signal sets current at 500 mA. A high-Z input disables USB charging.
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Battery Voltage Regulation The voltage regulation feedback is through the OUT pin. This input is tied directly to the positive side of the battery pack. The EUP8020X monitors the battery pack voltage between the OUT and VSS pins. When the battery voltage rises to VO(REG) threshold, the voltage regulation phase begins and the charging current begins to taper down. As a safety backup, the EUP8020X also monitors the charge time in the charge mode. If charge is not terminated within this time period, t(CHG), the EUP8020X turns off the charger and enunciates FAULT on the STATx pins. Please refer to the Timer Fault Recovery section for additional details. Charge Taper Detection, Termination and Recharge The EUP8020X monitors the charging current during the voltage regulation phase. Once the taper threshold, I(TAPER),is detected the EUP8020X initiates the taper timer, t(TAPER). Charge is terminated after the timer expires. The resistor connected between the ISET1 and VSS, RSET, determines the taper detection level. The V(TAPER) and K(SET) parameters are specified in the specifications table. Note that this applies to both AC and USB charging.
V(TAPER ) x K (SET ) I (TAPER) = R SET
Note On EUP8020F The EUP8020F monitors the charging current during the voltage regulation phase. Once the taper threshold, I(TAPER),is detected the EUP8020F terminates the charge. There is no taper timer, t(TAPER) for this version. The resistor connected between the ISET1 and VSS, RSET, determines the taper detection level for AC input. For USB charge, taper level is fixed at 10% of the 100- or 500-mA charge rate. Also note that there is I(TERM) detection in EUP8020F. Sleep Mode The EUP8020X enters the low-power sleep mode if both AC and USB are removed from the circuit. This feature prevents draining the battery during the absence of input supply. Charge Status Outputs The open-drain STAT1 and STAT2 outputs indicate various charger operations as shown in the following table. These status pins can be used to drive LEDs or communicate to the host processor. Note that OFF indicates the open-drain transistor is turned off. Table 1. Status Pins Summary
------------------ (3)
CHARGE STATE Precharge in progress Fast charge in progress Charge done Charge suspend (temperature) Timer fault Sleep mode STAT1 STAT2 ON ON ON OFF OFF ON OFF OFF OFF OFF OFF OFF
The EUP8020X resets the taper timer in the event that the charge current returns above the taper threshold, I(TAPER). In addition to the taper current detection, the EUP8020X terminates charge in the event that the charge current falls below the I(TERM) threshold. This feature allows for quick recognition of a battery removal condition or insertion of a fully charged battery. Note that charge timer and taper timer are bypassed for this feature. The resistor connected between the ISET1 and VSS, RSET, determines the taper detection level. The V(TERM) and K(SET) parameters are specified in the specifications table. Note that this applies to both AC and USB charging.
OFF means the open-drain output transistor on the STAT1 and STAT2 pins is in an off state.
PG Output
I (TERM) =
V(TERM ) x K (SET ) R SET
The open-drain PG (Power Good) indicates when the AC adapter is present. The output turns ON when a valid voltage is detected. This output is turned off in the sleep mode. The PG pin can be used to drive an LED or communicate to the host processor.
-------------------- (4)
After charge termination, the EUP8020X re-starts the charge once the voltage on the OUT pin falls below the V(RCH) threshold. This feature keeps the battery at full capacity at all times.
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CE Input (Charge Enable)
The CE digital input is used to disable or enable the charge process. A low-level signal on this pin enables the charge and a high-level signal disables the charge and places the device in a low-power mode. A high-to-low transition on this pin also resets all timers and timer fault conditions. Note that this applies to both AC and USB charging.
TTE Input (Timer and Termination Enable)
The TTE digital input is used to disable or enable the fast-charge timer and charge taper detection. A low-level signal on this pin enables the fast-charge timer and taper timer and a high-level signal disables this feature. Note that this applies to both AC and USB charging. Thermal shutdown and Protection The EUP8020X monitors the junction temperature, TJ, of the die and suspends charging if TJ exceeds T(SHTDWN). Charging resumes when TJ falls below T(SHTDWN) by approximately 30 J .
TE Input (Timer Enabled)
Condition #2: Charge voltage below recharge threshold (V(RCH)) and timeout fault occurs Recovery method: Under this scenario, the EUP8020X applies the I(FAULT) current. This small current is used to detect a battery removal condition and remains on as long as the battery voltage stays below the recharge threshold. If the battery voltage goes above the recharge threshold, then the EUP8020X disables the I(FAULT) current and executes the recovery method described for condition #1. Once the battery falls below the recharge threshold, the EUP8020X clears the fault and starts a new charge cycle. A POR or CE or TTE toggle also clears the fault.
The TE digital input is used to disable or enable the fast-charge timer. A low-level signal on this pin enables the fast-charge timer and a high-level signal disables this feature. Note that this applies to both AC and USB charging. Timer Fault Recovery As shown in Figure 3, EUP8020X provides a recovery method to deal with timer fault conditions. The following summarizes this method: Condition #1: Charge voltage above recharge threshold (V(RCH)) and timeout fault occurs Recovery method: EUP8020X waits for the battery voltage to fall below the recharge threshold. This could happen as a result of a load on the battery, self-discharge or battery removal. Once the battery falls below the recharge threshold, the EUP8020X clears the fault and starts a new charge cycle. A POR or CE or TTE toggle also clears the fault.
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Packaging Information
TDFN-10
SYMBOLS A A1 D E1 E L b e D1
MILLIMETERS MIN. 0.70 0.00 2.90 1.70 2.90 0.30 0.18 0.50 2.40 3.10 0.50 0.30 0.114 0.012 0.007 MAX. 0.80 0.05 3.10 MIN. 0.028 0.000 0.114
INCHES MAX. 0.031 0.002 0.122 0.067 0.122 0.020 0.012 0.020 0.094
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