LP28010A/28010C Preliminary Single-Chip, Li-Ion/Polymer Battery Charge Manager With Integrated FET and Charge Timer For Handheld Application General Description Features The LP28010 series are highly integrated single cell Li-Ion/Polymer battery charger IC designed for handheld devices. The LP28010 offer integrated power FET and current sensor, reverse blocking protection, high accuracy current and voltage regulation, charge status, and charge termination, in a small package. The LP28010 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 LP28010 automatically re-starts the charge if the battery voltage falls below an internal threshold. □ □ Applications Portable Media Players/MP3 players Cellular and Smart mobile phone PDA DSC Ordering Information LP28010 □ Small 3*3mm DFN-10 Package Ideal for Low-Dropout Charger Designs for Single-Cell Li-Ion or Li-Pol Packs in Space Limited Portable Applications Integrated Power FET and Current Sensor for Up to 1-A Charge Applications From AC Adapter 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 □ F:PB-Free Marking Information Please see website. Package QV:DFN-10 Output Type A: A Type C: C Type Typical Application Circuit LP28010 LP28010-datasheet V1.1 Nov.-2005 1-12 LP28010A/28010C Preliminary Description(Continued) In addition to the standard features, different versions of the Low-power’s offer a multitude of additional features. These include temperature sensing input for detecting hot or cold battery packs; Power Good (PG) output indicating the presence of input power; a TTL-level charge enable input (CE) used to disable or enable the charge process; and a TTL-level timer and taper–detect enable (TTE) input used to disable or enable the fast-charge timer and charge termination. Functional Pin Description LP28010A LP28010C LP28010-datasheet V1.1 Nov.-2005 2-12 LP28010A/28010C Preliminary PIN LP28010A LP28010C DESCRIPTION AC 1 1 AC charge input voltage VCC 2 2 USB charge input voltage STAT1 3 3 Charge status output 1 (open-drain) STAT2 4 4 Charge status output 2 (open-drain) VSS 5 5 ISET 6 6 PG 7 - Ground input Charge current set point for AC input and precharge and taper set point for both AC and USB Powergood status output (active low) TS CE 8 - 7 Temperature sense input Charge enable input (active low) TTE BAT OUT 9 10 8 9 10 Timer and termination enable input (active low) Battery voltage sense input Charge Current Output Function Block Diagram LP28010-datasheet V1.1 Nov.-2005 3-12 LP28010A/28010C Preliminary Operation Flow Chart LP28010-datasheet V1.1 Nov.-2005 4-12 LP28010A/28010C Preliminary Absolute Maximum Ratings LP28010A/C AC, USB, STAT1, Input voltage STAT2, TS, PG, CE, TTE, OUT, ISET1, ISET2 Output sink/source current STAT1, STAT2, PG Output current TS Output current OUT Operating free–air temperature range, TA Storage temperature, Tstg Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds -0.3 to 6.0 V 15 200 1.5 mA µA A - 40 to 125 °C - 65 to 150 260 (1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) All voltages are with respect to VSS. Dissipation Ratings Package θJA DFN-10 48°C/W RECOMMENDED OPERATING CONDITIONS TA < 40°C Power Derating Factor Above Rating TA =25°C 0.0208 W/°C 1.5W (1) MIN Supply voltage (from AC input), VCC Operating junction temperature range, TJ LP28010-datasheet V1.1 Nov.-2005 4.5 –40 5-12 NOM MAX UNIT 5.5 125 V C LP28010A/28010C Preliminary Electrical Characteristics (over 0C ≤TJ ≤125°C and recommended supply voltage, unless otherwise noted ) PARAMETER TEST CONDITIONS MIN TYP INPUT CURRENT MAX UNIT VCC current, ICC(VCC) VCC > VCC(min) 0.9 1.5 Sleep current, ICC(SLP) Sum of currents into OUT pin, VCC < V(SLP) 1 5 Standby current, ICC(STBY) CE = High, 0°C ≤TJ ≤ 85°C Input current on OUT pin, IIB(OUT) Charge DONE, VCC > VCC(MIN) 50 1 mA 150 5 Input current on CE pin, IIB(CE) 1 Input bias current on TTE pin, IIB(TTE) 1 µA VOLTAGE REGULATION VO(REG) + V(DO–MAX) ≤VCC , I(TERM) < IO(OUT) ≤ 1 A Output voltage, VO(REG) 4.20 Voltage regulation accuracy Voltage regulation accuracy AC dropout voltage (V(AC)–V(OUT)), V(DO) USB dropout voltage (V – V ) USB dro out voltage (V V ) V(DO) TA = 25°C V –0.5% 0.5% –1.5% 1.5% VO(OUT) = VO(REG), IO(OUT) = 1A VO(REG) + V(DO–MAX)) ≤VCC, 400 500 VO(OUT) = VO(REG) ISET2 = High VO(REG) + V(DO–MAX)) ≤VCC, 400 500 VO(OUT) = VO(REG) ISET2 = Low VO(REG) + V(DO–MAX)) ≤VCC, 100 mV mV 150 CURRENT REGULATION AC output current range, IO(OUT)(1) VI(OUT) > V(LOWV), VI(AC) –VI(OUT) > V(DO–MAX), VCC ≥ 4.5 V, Output current set voltage, V(SET) Voltage on ISET1 pin, VCC ≥ 4.5 V, VIN ≥ 4.5 V, VI(OUT) > V(LOWV), VIN – VI(OUT) > V(DO–MAX) 2.41 50 mA ≤IO(OUT) ≤1 A Output current set factor, K(SET)Out ut current set factor, K(SET) 50 1000 mA 2.46 2.54 V 294 310 326 10 mA ≤IO(OUT) < 50 mA 284 310 336 1 mA ≤IO(OUT) < 10 mA 246 310 416 PRECHARGE AND SHORT-CIRCUIT CURRENT REGULATION Precharge to fast-charge transition threshold, V(LOW) Voltage on OUT pin 2.8 3.0 3.2 V Deglitch time for fast-charge to precharge transition VCC(MIN) ≥ 4.5 V, tFALL = 100 ns, 10 mV overdrive VI(OUT) 250 375 500 ms LP28010-datasheet V1.1 Nov.-2005 6-12 LP28010A/28010C Preliminary decreasing below threshold Precharge range, IO(PRECHG)(2) 0 V < VI(OUT) < V(LOWV), t < 5 t(PRECHG) Voltage on ISET1 pin, VO(REG) = 4.2 V, 0 V < VI(OUT) > V(LOWV), t < t(PRECHG) Precharge set voltage, V(PRECHG) 230 245 100 mA 260 mV CHARGE TAPER AND TERMINATION DETECTION Charge taper detection range, I(TAPER)(3) Charge taper detection set voltage, V(TAPER) VI(OUT) > V(RCH), t < t(TAPER) 5 100 mA Voltage on ISET1 pin, VO(REG) = 4.2 V, VI(OUT) > V(RCH), t < t(TAPER) 235 Charge termination detection set voltage, V(TERM)(4) Voltage on ISET pin, VO(REG) = 4.2 V, VI(OUT) > V(RCH) 11 18 25 Deglitch time for TAPER detection, tTPRDET VCC(MIN) ≥ 4.5 V, tFALL = 100 ns charging current increasing or decreasing above and below 10 mV overdrive 250 375 500 VCC(MIN) ≥ 4.5 V, tFALL = 100 ns charging current decreasing below 10 mV overdrive 250 375 500 Low-voltage threshold, V(LTF) 2.49 2.515 2.54 High-voltage threshold, V(HTF) 0.495 0.510 0.525 Current source, I(TS) 102 112 122 µA Deglitch time for temperature fault, t(DEGL) 250 375 500 ms VO(REG) –0.15 VO(REG) –0.10 VO(REG) –0.05 V 250 375 500 Deglitch time for termination detection, tTRMDET 250 265 mV ms TEMPERATURE SENSE COMPARATOR V BATTERY RECHARGE THRESHOLD Recharge threshold, VRCH VCC(MIN) ≥ 4.5 V, tFALL = 100 ns Deglitch time for recharge detect, t(DEGL) decreasing below or increasing above threshold, ms STAT1, STAT2, and PG OUTPUTS Low-level output saturation voltage, VOL IO = 5 mA 0.25 V CHARGE ENABLE (CE) AND TIMER AND TERMINATION ENABLE (TTE) INPUTS Low-level input voltage, VIL IIL = 10 µA 0 High-level input voltage, VIH IIL = 20 µA 1.4 CE or TTE low-level input current, IIL LP28010-datasheet V1.1 –1 Nov.-2005 7-12 0.4 V µA LP28010A/28010C Preliminary CE or TTE high-level input current, IIH 1 TIMERS Precharge time, t(PRECHG) 1,620 1,800 1,930 Taper time, t(TAPER) 1,620 1,800 1,930 Charge time, t(CHG) 16,200 18,000 19,300 Timer fault recovery current, I(FAULT) s 200 µA SLEEP COMPARATOR VCC ≤VI(OUT) +100 mV Sleep-mode entry threshold voltage, V(SLP) 2.3 V ≤VI(OUT) ≤VO(REG) Sleep mode exit threshold voltage, V(SLPEXIT) 2.3 V ≤VI(OUT) ≤VO(REG) VCC ≥ VI(OUT) +190mV Sleep mode deglitch time AC and USB decreasing below threshold, tFALL = 100 ns, 10 mV overdrive 250 V 375 500 ms THERMAL SHUTDOWN THRESHOLDS Thermal trip threshold, T(SHTDWN) 165 Thermal hysteresis 30 °C UNDERVOLTAGE LOCKOUT Undervoltage lockout V(UVLO) Decreasing VCC 2.4 Hysteresis LP28010-datasheet V1.1 2.5 2.6 20 Nov.-2005 8-12 V mV LP28010A/28010C Preliminary Applications Information Temperature Qualification ( 28010A Only) The LP28010X 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 Ω negative-temperature coefficient thermistors (NTC) (see Figure 5). The device compares the voltage on the TS pin against the internal V(LTF) and (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 (LOW) threshold, the LP28010X 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. V(PRECHG) and K(SET) parameters are specified in the specifications table. Note that this applies to both AC and USB charging. The LP28010 activates a safety timer, t(PRECHG), during the conditioning phase. If V(LOWV) threshold is not reached within the timer period, the LP28010 turns off the charger and enunciates FAULT on the STATx pins. Please refer to the Timer Fault Recovery section for additional details. LP28010-datasheet V1.1 Nov.-2005 Figure 5. Temperature Sensing Configuration Figure 6. Temperature Sensing Thresholds Battery Charge Current The LP28010X 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. 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 LP28010X 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 LP28010X also monitors the charge time in the charge mode. If charge is not terminated within this time period, t(CHG), the LP28010 turns off the charger and enunciates FAULT on the STAT pins. Please refer to the Timer Fault Recovery section for additional details. 9-12 LP28010A/28010C Preliminary Charge Taper Detection, Termination and Recharge The LP28010 monitors the charging current during the voltage regulation phase. Once the taper threshold, (TAPER),is detected the LP28010 initiates the taper timer, (TAPER). Charge is terminated after the timer expires. The resistor connected between the ISET and VSS, RSET, determines the taper detection level. The V(TAPER) and (SET) parameters are specified in the specifications table. The LP28010X resets the taper timer in the event that the charge current returns above the taper threshold, (TAPER). In addition to the taper current detection, the LP28010X 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 ISET and VSS, RSET, determines the taper detection level. The V(TERM) and K(SET) parameters are specified in the specifications table. After charge termination, the LP28010X re-starts the charge once the voltage on the OUT pin falls below the (RCH) threshold. This feature keeps the battery at full capacity at all times. Sleep Mode The LP28010X enters the low-power sleep mode if both AC is removed from the circuit. This feature prevents draining the battery LP28010-datasheet V1.1 Nov.-2005 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. CHARGE STATE STAT1 STAT2 Precharge in progress ON ON Fast charge in progress ON OFF Charge done OFF ON Charge suspend (temperature) OFF OFF Timer fault OFF OFF Sleep mode OFF OFF OFF means the open-drain output transistor on the STAT1 and STAT2 pins is in an off state. PG Output 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. 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. 10-12 LP28010A/28010C Preliminary Thermal shutdown and Protection The LP28010X 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 ℃. Timer Fault Recovery As shown in Figure 3, LP28010X 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: LP28010X 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 LP28010X clears the fault and starts a new charge cycle. A POR or CE or TTE toggle also clears the fault. LP28010-datasheet V1.1 Nov.-2005 Condition #2: Charge voltage below recharge threshold (V(RCH)) and timeout fault occurs Recovery method: Under this scenario, the LP28010X 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 LP28010X disables the I(FAULT) current and executes the recovery method described for condition #1. Once the battery falls below the recharge threshold, the LP28010X clears the fault and starts a new charge cycle. A POR or CE or TTE toggle also clears the fault. 11-12 LP28010A/28010C Preliminary Packaging Information LP28010-datasheet V1.1 Nov.-2005 12-12