EUP8054 EUTECH | Alldatasheet
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DS8054 Ver1.1 Jan. 2007 Standalone Linear Li-Ion Battery Charger With Thermal Regulation in ThinSOT
DESCRIPTION
The EUP8054 is a complete constant-current/constant- voltage linear charger for single cell lithium-ion batteries. Its ThinSOT package and low external component count make the EUP8054 ideally suited for portable applications. Furthermore, the EUP8054 is specifically designed to work within USB power specifications. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V , and the charge current can be programmed externally with a single resistor. The EUP8054 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the EUP8054 automatically enters a low current state, dropping the battery drain current to less than 2µA. The EUP8054 can be put into shutdown mode, reducing the supply current to 25µA. Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.
FEATURES
z Programmable Charge Current Up to 800mA z No MOSFET, Sense Resistor or Blocking Diode Required z Complete Linear Charger in ThinSOT Package for Single Cell Lithium-ion Batteries z Constant-Current/Constant-V oltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating z Charges Single Cell Li-Ion Batteries Directly from USB Port z Preset 4.2V Charge V oltage with ±1% Accuracy z Charge Current Monitor Output for Gas Gauging z Automatic Recharge z Charge Status Output Pin z C/10 Charge Termination z 25µA Supply Current in Shutdown z 2.9V Trickle Charge Threshold (EUP8054) z Available Without Trickle Charge (EUP8054X) z Soft-Start Limits Inrush Current z Available in TSOT-25, TDFN-6(3mm*3mm) Package z RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
z Cellular Telephones/ PDAs/ MP3 Players z Charging Docks and CradIes z Bluetooth Applications
DS8054 Ver1.1 Jan. 2007 Pin Configurations Package Type Pin Configurations TSOT-25 TDFN-6 Pin Description PIN TSOT-25 TDFN6 DESCRIPTION CHRG 1 1 Open-Drain Status Output GND 2 2 Ground BAT 3 6 Charge Current Output VCC 4 4 Positive Input Supply V oltage PROG 5 3 Charge Current Program, Charge Current Monitor and Shutdown Pin. N/C 5 No connection Pin Functions CHRG :Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a weak pull-down of approximately 12µA is connected to the CHRG pin, indicating a “AC presen t” condition. When the EUP8054 detects an undervoltage lockout condition, CHRG is forced high impedance. GND : Ground. BAT : Charge Current Output. Provides charge current to the battery and regulates the final float voltage to 4.2V . An internal precision resistor divider from this pin sets the float voltage which is disconnected in shutdown mode. V CC : Positive Input Supply V oltage. Provides power to the charger. V CC can range from 4.35V to 6.5V and should be bypassed with at least a 1µF capacitor. When V CC drops to within 30mV of the BAT pin voltage, the EUP8054 enters shutdown mode, dropping IBAT to less than 2µA.
DS8054 Ver1.1 Jan. 2007 Pin Functions (continue) PROG: Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a 1% resistor, RPROG, to ground. When charging in constant-current mode, this pin servos to 1V . In all modes, the voltage on this pin can be used to measure the charge current using the following formula: ( ) 1000PROGR/PROGVBATI •= The PROG pin can also be used to shutdown the charger. Disconnecting the program resistor from ground allows a 3µA current to pull the PROG pin high. When it reaches the 1.94V shutdown threshold voltage, the charger enters shutdown mode, charging stops and the input supply current drops to 25µA. This pin is also clamped to approximately 2.4V . Driving this pin to voltages beyond the clamp voltage will draw currents as high as1.5mA. Reconnecting R PROG to ground will return the charger to normal operation. N/C: No connection.
Ordering Information
Order Number Package Type Marking Operating Temperature range EUP8054OIR1 TSOT-25 UNxx -20 °C to 70°C EUP8054XOIR1 TSOT-25 UXxx -20 °C to 70°C EUP8054RIR1 TDFN-6 xxxx 8054N -20 °C to 70°C EUP8054/X □ □ □ □ Lead Free Code 1 : L e a d F r e e 0 : L e a d P a c k i n g R: Tape& Reel Operating temperature range I: Industry Standard Package Type O: TSOT R:TDFN
DS8054 Ver1.1 Jan. 2007 Absolute Maximum Ratings Electrical Characteristics over Recommended Operating Free-Air Temperature Range Otherwise specifications are at TA=25℃. VCC=5V , unless otherwise noted. EUP8054 Symbol Parameter Conditions Min. Typ. Max. Unit VCC Input Supply V oltage 4.35 6.5 V ICC Input Supply Current Charge Mode (Note 4),RPROG = 10k Standby Mode (Charge Terminated) Shutdown Mode (RPROG Not Connected, VCC < VBAT, or VCC < VUV) 350 200 2000 500 µA VFLOAT Regulated Output (Float) V oltage 0℃≤TA ≤85℃, IBAT = 40mA 4.158 4.2 4.242 V IBAT BAT Pin Current RPROG = 10k, Current Mode RPROG = 2k, Current Mode Standby Mode, VBAT = 4.2V Shutdown Mode (RPROG Not Connected) Sleep Mode, VCC = 0V 100 475 110 510 -2.5 120 545 mA mA µA µA µA ITRIKL Trickle Charge Current VBAT < VTRIKL, RPROG = 2k (Note 5) 20 50 70 mA VTRIKL Trickle Charge Threshold V oltage RPROG = 10k, VBAT Rising (Note 5) 2.8 2.9 3.0 V VTRHYS Trickle Charge Hysteresis V oltage RPROG = 10k (Note 5) 60 80 110 mV VUV VCC Undervoltage Lockout Threshold From VCC Low to High 3.55 3.7 3.85 V VUVHYS VCC Undervoltage Lockout Hysteresis 150 200 300 mV VMSD Manual Shutdown Threshold V oltage PROG Pin Rising 1.85 1.94 2.05 V VASD VCC – VBAT Lockout Threshold V oltage VCC from Low to High VCC from High to Low 100 140 50 mV ITERM C/10 Termination Current Threshold RPROG = 10k (Note 6) RPROG = 2k 0.085 0.085 0.10 0.10 0.115 0.115 mA/mA VPROG PROG Pin V oltage R PROG = 10k, Current Mode 0.96 1.03 1.10 V I CHRG CHRG Pin Weak Pull-Down Current V CHRG = 5V 7 12 20 µA
DS8054 Ver1.1 Jan. 2007 Electrical Characteristics Over Recommended Operating Free-Air Temperature Range Otherwise specifications are at TA=25℃. VCC=5V , unless otherwise noted. EUP8054 Unit Symbol Parameter Conditions Min. Typ. Max. V CHRG CHRG Pin Output Low V oltage I CHRG = 5mA 0.35 0.6 V ΔVRECHRG Recharge Battery Threshold V oltage V FLOAT-VRECHRG 100 150 200 mV TLIM Junction Temperature in Constant Temperature Mode 120 ℃ RON Power FET “ON” Resistance (Between VCC and BAT) 600 mΩ tSS Soft-Start Time I BAT = 0 to IBAT =1000V/RPROG 100 µs tRECHARGE Recharge Comparator Filter Time V BAT High to Low 0.75 2 4.5 ms tTERM Termination Comparator Filter Time I BAT Falling Below ICHG/10 400 1000 2500 µs IPROG PROG Pin Pull-Up Current 3 µA Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: The EUP8054 are guaranteed to meet performance spec ifications from 0 ℃ to 70 ℃. Specifications over the -40 ℃ to 85 ℃ operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: See Thermal Considerations. Note 4: Supply current includes PROG pin cu rrent (approximately 100µA) but does not incl ude any current delivered to the batter y through the BAT pin (approximately 100mA). Note 5: This parameter is not applicable to the EUP8054X. Note 6: I TERM is expressed as a fraction of measured full charge current with indicated PROG resistor.
DS8054 Ver1.1 Jan. 2007 Typical Operating Characteristics
DS8054 Ver1.1 Jan. 2007
DS8054 Ver1.1 Jan. 2007
Figure 6. Block Diagram
DS8054 Ver1.1 Jan. 2007 Operation The EUP8054 is a single cell lithium-ion battery charger using a constant-current/constant-voltage algorithm. It can deliver up to 800mA of charge current (using a good thermal PCB layout) with a final float voltage accuracy of ±1%. The EUP8054 includes an internal P-channel power MOSFET and thermal regulation circuitry. No blocking diode or external current sense resistor is required; thus, the basic charger circuit requires only two external components. Furthermore, the EUP8054 is capable of operating from a USB power source. Normal Charge Cycle A charge cycle begins when the voltage at the V CC pin rises above the UVLO threshold level and a 1% program resistor is connected from the PROG pin to ground or when a battery is connected to the charger output. If the BAT pin is less than 2.9V , the charger enters trickle charge mode. In this mode, the EUP8054 supplies approximately 1/10 the programmed charge current to bring the battery voltage up to a safe level for full current charging. (Note: The EUP8054X does not include this trickle charge feature). When the BAT pin voltage rises above 2.9V , the charger enters constant-current mode, where the programmed charge current is supplied to the battery. When the BAT pin approaches the final float voltage (4.2V), the EUP8054 enters constant-voltage mode and the charge current begins to decrease. When the charge current drops to 1/10 of the programmed value, the charge cycle ends. Programming Charge Current The charge current is programmed using a single resistor from the PROG pin to ground. The battery charge current is 1000 times the current out of the PROG pin. The program resistor and the charge current are calculated using the following equations: CHGIPROGR V1000= , PROGRCHGI V1000= The charge current out of the BAT pin can be determined at any time by monitoring the PROG pin voltage using the following equation: 1000 PROGR PROGBATI V •= 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 voltag e falls below 100mV for longer than tTERM (typically 1ms), charging is terminated. The charge current is latched off and the EUP8054 enters standby mode, where the input supply current drops to 200 µA. 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 1/10th the programmed value. The 1ms filter time (t TERM) on the termination comparator ensures that transient loads of this nature do not result in premature charge cycle termi- nation. Once the average charge current drops below 1/10th the programmed value, the EUP8054 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 EUP8054 constantly monitors the BAT pin voltage in standby mode. If this voltage drops below the 4.05V recharge threshold (V RECHRG), another charge cycle begins and current is once again supplied to the battery. To manually restart a charge cycle when in standby mode, the input voltage must be removed and reapplied, or the charger must be shut down and restarted using the PROG pin. Figure 7 shows the state diagram of a typical charge cycle. Charge Status Indicator (CHRG ) The charge status output has three different states: strong pull-down(~10mA), weak pull-down (~12 µA) and high impedance. The strong pull-down state indicates that the EUP8054 is in a charge cycle. Once the charge cycle has terminated , the pin state is determined by undervoltage lockout conditions. A weak pull-down indicates that V CC meets the UVLO conditions and the EUP8054 is ready to charge. High impedance indicates that the EUP8054 is in undervoltage lockout mode: either V CC i s l e s s t h a n 100mV above the BAT pin voltage or insufficient voltage is applied to the V CC pin. A microprocessor can be used to distinguish between these th ree states –this method is discussed in the Applications Information section.
further in the Applications Information section. rises 100mV above the battery voltage. periodic charge cycle initiations. strong pull-down state during recharge cycles. Figure 7. State Diagram of a Typical Charge Cycle
DS8054 Ver1.1 Jan. 2007
Application Information
The constant-voltage mode feedback loop is stable without an output capacitor provided a battery is connected to the charger out put. With no battery present, an output capacitor is recommended to reduce ripple voltage. When using high value, low ESR ceramic capacitors, it is recommended to add a 1 Ω resistor in series with the capacitor. No series resistor is needed if tantalum capacitors are used. In constant-current mode, the PROG pin is in the feedback loop, not the battery. The constant-current mode stability is affected by th e impedance at the PROG pin. With no additional capacitance on the PROG pin, the charger is stable with program resistor values as high as 20k. However, additional capacitance on this node reduces the maximum allowed program resistor. The pole frequency at the PROG pin should be kept above 100kHz. Therefore, if the PROG pin is loaded with a capacitance, C PROG, the following equation can be used to calculate the maximum resistance value for RPROG: PROG5PROG C102
- •π Average, rather than instantaneous, charge current may be of interest to the user. For example, if a switching power supply operating in low current mode is connected in parallel with the battery, the average current being pulled out of the BAT pin is typically of more interest than the instantaneous current pulses. In such a case, a simple RC filter can be used on the PROG pin to measure the average battery current as shown in Figure 8. A 10k resistor has been added between the PROG pin and the filter capacitor to ensure stability.
Figure 8. Isolating Capacitive Load on PROG Pin discharged Li-Ion battery with a voltage of 3.75V . proportionally as discussed in the Operation section.
can significantly decrease the power dissipation in the IC. component, such as a resistor or diode. discharged Li-Ion battery with a voltage of 3.75V . Figure 9. A Circuit to Maximize Thermal Mode low enough to put the EUP8054 into dropout.
DS8054 Ver1.1 Jan. 2007 Packaging Information T S O T - 2 5 MILLIMETERS INCHES SYMBOLS MIN. MAX. MIN. MAX. A - 1.00 - 0.039 A1 0.00 0.10 0.000 0.004 D 2.90 0.114 E1 1.60 0.063 E 2.60 3.00 0.102 0.118 L 0.30 0.60 0.012 0.024 b 0.30 0.56 0.012 0.022 e 0.95 0.037
DS8054 Ver1.1 Jan. 2007 Packaging Information TDFN-6 MILLIMETERS INCHES SYMBOLS MIN. MAX. MIN. MAX. A 0.70 0.90 0.028 0.035 A1 0.00 0.05 0.000 0.002 b 0.30 0.50 0.012 0.020 D 2.85 3.15 0.112 0.124 D1 2.30 0.090 E 2.85 3.15 0.112 0.124 E1 1.50 0.059 e 0.95 0.037 L 0.38 0.58 0.015 0.023