UNISONIC TECHNOLOGIES CO., LTD UB10803 Preliminary CMOS IC ONE-CELL STANDALONE LINEAR LITHIUM BATTERY CHARGER HSOP-8 DESCRIPTION The UTC UB10803 is a fully-integrated single-cell Li-ion/Polymer battery charger. The device operates without external FET and blocking diode, and employs a constant-current constant-voltage (CC/CV) charging profile. The fast-charge and end-of-charge (EOC) currents are programmable with independent external resistors. When the battery is deeply discharged to lower than 2.75V, the charger firstly pre-charges the battery with typically 20% of the programmable fast-charge current. When the charge current is reduced to the programmed EOC current level (almost works completely in a constant-voltage (CV) mode), an EOC indication is displayed through the CHG pins. The UTC UB10803 is protected by thermal regulation technology to prevent the IC from over-heat during charging. Two status indication pins (PPR and CHG), which are both implemented as an open-drain outputs, can be used to drive LEDs or work as logic interface to a microprocessor. When no adapter is attached or when the charger is disabled, the leakage current from battery cell is less than 1uA typically. DFN-8(2x3) FEATURES * A Constant-Current/Constant-Voltage Linear Charger for Single-Cell Li-ion/Polymer Batteries * Integrated Pass Element and Current Sensor * Highly-Integrated, Requiring No External FETs or Blocking Diode * 4.2V Voltage Accuracy: ±1.2% All Temperatures (Available with 4.10V and 4.36V options upon request) * Programmable Charge Current 50mA to 500mA * Programmable End-Of-Charge Current by Current Recharge Algorithm 1 * Pre-Charge for Fully Discharged Batteries * 1μA (Typ.) Leakage Current of the Battery when No Input Power is Attached or Charger is Disabled * Power Present and Charge Status Indications * Thermal Regulation on Charging Current to Prevent Over-Heat * Few Components, Cost-Effective Solutions ORDERING INFORMATION Ordering Number UB10803G-SH2-R UB10803G- K08-2030-R www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd Package HSOP-8 DFN-8(2×3) Packing Tape Reel Tape Reel 1 of 10 QW-R502-A26.b UB10803 Preliminary CMOS IC MARKING HSOP-8 PIN CONFIGURATION PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 8 PIN NAME VIN PPR CHG EN GND IMIN IREF BAT DFN-8(2×3) DESCRIPTION Supply Input Power Present Active-Low Open Drain Power Status Indicator Charge Active-Low Open Drain Charge Status Indicator Enable Active-Low Input Ground End-Of-Charge Current Setting Input Charge Current Setting Input for Adaptor Mode Battery Terminal UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 10 QW-R502-A26.b UB10803 Preliminary CMOS IC BLOCK DIAGRAM VIN 1:1:4000 POR 0.5uA 3.9V MA MA BAT Sleep CA VIN BAT VA VREF Enable VREF EN 200k Rechg 0.76V 1.0V PPR 0.2V EOC IMIN LOGIC 115°C OTP CHG T DI E BAT Trickle 2.75V GND IREF UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw IMIN 3 of 10 QW-R502-A26.b UB10803 Preliminary CMOS IC ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Input Supply Voltage VIN -0.3 ~ +7.0 V IREF Voltage VIREF -0.3 ~ +7.0 V IMIN Voltage VIMIN -0.3 ~ +7.0 V BAT Voltage VBAT -0.3 ~ +7.0 V EN Voltage VEN -0.3 ~ +7.0 V CHG Voltage VCHG -0.3 ~ +7.0 V PPR Voltage VPPR -0.3 ~ +7.0 V Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 2. Pulse (μsec) noise exceeding the above input voltage (GND+7.0V) may cause damage to the IC. THERMAL DATA PARAMETER Junction to Ambient Junction to Case RATINGS 59 4.5 UNIT °C/W C/W RECOMMENDED OPERATING CONDITIONS PARAMETER Operating Voltage Programmable Current Operating Temperature SYMBOL θJA θJC SYMBOL VIN ICHG TA MIN 4.5 50 -40 TYP MAX 6.0 500 85 UNIT V mA C ELECTRICAL CHARACTERISTICS (VCC=5V, TA=25°С unless otherwise specified) PARAMETER VIN-BAT Offset Voltage Rising Edge VIN-BAT Offset Voltage Falling Edge Rising Power On Reset Threshold Falling Power On Reset Threshold DC Supply Current SYMBOL VOS VPOR IDC BAT Pin Sink Current ISTBY Output Voltage VCH Power FET “ON” Resistance Constant Charge Current for Adaptor Mode Precharge Charge Current End of Charge Current EOC Rising Threshold Precharge Threshold Voltage Precharge Voltage Hysteresis Thermal Regulation Threshold EN Pin Logic Input High EN Pin Logic Input Low EN Pin Internal pull Down Resistance CHG Pin Sink Current When Low CHG Pin Leakage Current When High PPR Pin Sink Current When Low PPR Pin Leakage Current When High VDS(on) ICHG IPRE IMIN IRECH VPRE VPREHYS TFOLD VENH VENL REN ICHGOL ICHGOH IPPROL IPPROH UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TEST CONDITIONS VBAT=4.0V VBAT=4.0V VBAT=3.0V VBAT=3.0V Charge enabled Charge disabled Charge disabled or the input is floating 4.5V<VIN<6.5V, Charge Current=20mA VBAT=3.8V, Charge Current=0.5A RIREF=29.4kΩ,VBAT=2.8~4.0V RIREF=29.4kΩ,VBAT=2.4V RIMIN=29.4kΩ RIMIN=29.4kΩ MIN 10 3.4 3.1 TYP 90 50 3.9 3.6 500 300 MAX 150 4.3 4.1 1000 500 1 4.15 4.20 135 27 27 100 2.75 100 115 4.25 100 5 200 V μA V Ω 150 37 37 130 2.85 160 1.3 VCHG=1.0V VCHG=6.5V VPPR=1.0V VPPR=6.5V mV μA 0.6 120 17 17 70 2.65 40 UNIT 0.5 300 1 5 1 mA mA mA mA V mV C V kΩ mA μA mA μA 4 of 10 QW-R502-A26.b UB10803 Preliminary CMOS IC OPERATION The UTC UB10803 charges a single-cell Li-ion/Polymer battery with a programmed constant current (CC) or a constant voltage (CV) profile. The constant fast charge current ICHG is programmable by setting an external resistor RIREF while the constant voltage is factory-trimmed at 4.2V (4.10V or 4.36V options are available upon request). If the battery voltage is deeply discharged to lower than 2.75V, The UTC UB10803 pre-charges the battery with a 20% programmable current until the battery voltage rises above the pre-charge threshold. After pre-charge finishes, constant-current (CC) charging mode begins with the pre-set fast charge current. Normally, the battery voltage rises gradually during CC charge phase. When the battery voltage reaches nearly 4.2V, the charger enters the constant-voltage (CV) charging mode and begins to regulate the battery voltage at 4.2V while diminishing the charging current gradually. When the charging current is reduced to an amount smaller than the programmed End-Of-Charge (EOC) current level, the charger gives out a “full-charge” indication through the CHG pin, but the charger still continues to regulate the battery voltage at 4.2V with safe & small current. The end-of-charge (EOC) current level (IMIN) can be easily programmed with an external resistor RIMIN. The CHG signal turns to LOW when pre-charge starts and rises to HIGH when EOC is reached. After reaching EOC, the charge current has to rise again to typically 76% of ICHG before the CHG signal will turn on again. The current surge after EOC can be caused by a load connected to the battery. When the die temperature reaches 115°C (typically), a thermal regulation function is employed to reduce the charge current accordingly to maintain the temperature from increasing furthermore. This is an important function to achieve safe operation even when the printed circuit board (PCB) is not effective in leaking out the heat generated by the linear charger. 1. PPR Indication The PPR pin is implemented as an open-drain output to provide a power-good indication of the input power source such as an AC adapter. When the input voltage is higher than the POR (Power-On Reset) threshold, the PPR pin turns on the internal open-drain MOSFET to indicate logic LOW signal. The PPR indication is designed to be independent on the chip enable (EN-pin) input. When the internal open-drain FET is turned off, the PPR pin should leak less than 1μA current. When turned on, the PPR pin should be able to sink at least 5mA current under all operating conditions. The PPR pin can be used to drive an LED or worked as logic interface to a microprocessor. 2. Power-Good Range The input voltage is considered as power good when it meets the following three conditions: (1). VIN > VPOR (2). VIN - VBAT > VOS Where the VOS is the offset voltage, it determines if the battery voltage is even higher than the input voltage. All VPOR and VOS are realized with sufficient hysteresis, as given in the Electrical Specification table. All charging activities are disabled when the input voltage falls out of the power-good range. 3. Input and Output Comparator Obviously, when the input source voltage is lower than the battery voltage, no charging activity could be started and the charger will disable the internal pass element to prevent battery leakage. Charge begins when the input voltage is higher than the battery voltage by a defined offset voltage (VOS). This scheme also ensures that the charger is completely turned off when the input power is removed from the charger. 4. CHG Indication The CHG pin is implemented as an open-drain output to give a logic LOW when a charge cycle begins and turn HIGH when an end-of-charge (EOC) condition is reached. This pin is designed with a sinking ability of more than 5mA so as to drive an LED. When the charger is disabled through EN-pin, the CHG output is high impedance. The CHG pin can also be used to interface with a microprocessor. 5. EN Input The chip is enabled by a logic LOW signal applied to the EN pin. This pin is realized with a 200kΩ internal pull-down resistor such that even the EN pin is left floating, the input is equivalent to logic LOW and the chip is enabled by default. Similarly, the chip is disabled when the EN pin receives a logic HIGH signal. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 10 QW-R502-A26.b UB10803 Preliminary CMOS IC OPERATION(Cont.) 6. IMIN Indication The IMIN pin can be used to program the End-of-Charge (EOC) current by connecting a resistor between this pin and the GND pin. The programming is defined by the following equation: 800 IMIN (mA) = RIMIN Where RIMIN is usually in kΩ. 7. IREF Pin The IREF pin is for fast charge-current programming. By connecting a resistor between this pin and the GND pin, the fast charge current limit is determined by the following equation: ICHG (mA) = 4000 RIREF Where RIREF is in kΩ. The actual charge current is guaranteed to have 10% accuracy of ICHG with the charge current set at 150mA. 8. BAT pin Always connect the BAT pin to a single-cell Li-ion/Polymer battery in parallel with a 1μF (or larger) X5R ceramic capacitor for decoupling and guaranteeing system stability. When the EN pin is pulled to logic HIGH, the BAT output is disabled. The UTC UB10803 relies on a battery for stability and is not guaranteed to be stable if the battery is not connected. 9. Dropout Voltage When the input voltage is low while the battery voltage is high, the charging current may not be maintained according to the equation ICHG (mA) = 4000/RIREF due to a limited internal on-resistance (RDS(ON)) of the internal pass element. The worst resistance of the pass FET is about 1.2Ω at the maximum operating temperature, thus if tested with 500mA current and 4.2V battery voltage, constant current could still be maintained when the input voltage is as low as 4.62V. 10. Thermal Foldback The bottom big exposed pads in both HSOP-8 and DFN-8(2x3) packages are used for thermal foldback. For reducing the chip ambient temperature as much as possible, it is recommended to connect as much copper as possible to this pad either on the component layer or other layers through thermal vias. The thermal regulation function starts to reduce the charge current when the internal temperature reaches a typical value of 115°C. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 10 QW-R502-A26.b UB10803 Preliminary CMOS IC APPLICATION INFORMATION Input Capacitor Selection The input capacitor is employed to decouple the power supply from load transients and suppress noise from power lines. Typically, a 1μF X5R ceramic capacitor is recommended to be placed very close between the VIN pin and GND pin to stabilize the operation during the start up, especially when the input supply is passing the POR threshold and the VIN-BAT comparator offset voltage. Once passing through the POR threshold, there is a voltage hysteresis to provide sufficient guard band from noise or load transient to trigger the system to reset. Output Capacitor Selection The criterion for selecting the output capacitor is to maintain the stability of the charger as well as to bypass any transient load current. Typically, a minimum capacitance of 1μF X5R ceramic capacitor is recommended and sufficient for stabilizing the system. For systems that may happen to occasionally see high load transients, the output capacitor may be increased to further bypass any ripples so caused. Charge Current Limit During the constant-current (CC) charging mode, the charging current is primarily determined by ICHG as calculated in previous formula. However, the actual charge current in the CC mode could also be limited by other factors. When the input (VIN) and output (VBAT) voltages are too close to each other, the on-resistance of the internal pass element may limit the amount of current that passes through it. When the input voltage is sufficiently higher than the battery voltage, yet has not increased the die temperature over the thermal limit. When the input voltage is reduced (or the battery voltage increases towards the input voltage), the charge current is limited by the on-resistance of the pass element. Therefore, it is recommended to employ sufficiently high input voltage for applications that require constant charging current over the entire charging period. But for applications that needs to minimize the heat dissipation, a current-limiting adapter maybe applied to maintain constant charging current at whole charging phase. In addition, if the input voltage increases, the charge current may also be reduced due to the thermal fold back function. The high voltage drop across the pass element increases the power dissipation therein and thus causing the die temperature to increase significantly. Layout Guidance The UTC UB10803 employs thermally-enhanced DFN package, which has an exposed thermal pad at its bottom side. It is recommended to connect as much copper as possible between the exposed pad and PCB to make it effective in taking the heat away from the die. For applications requiring high charging current, the thermal impedance should be further reduced by employing more layers of copper to connect with the exposed pad through thermal via. Input Power Sources The UTC UB10803 works with different types of AC/DC adapter or USB port (any type) with no special requirements. The UTC UB10803 accepts input voltage ranges from 4.5V to 6.5V for normal operation. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 10 QW-R502-A26.b UB10803 Preliminary CMOS IC TYPICAL CHARGE PROFILE UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 10 QW-R502-A26.b UB10803 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT Fig1. Typical Application Circuit for LED Display Component Description for Figure 1 Description 1μF X5R ceramic cap 1μF X5R ceramic cap 29.4kΩ, 1% for 135mA charge current 29.4kΩ, 1% for 27mA EOC current 300Ω, 5% LEDs for indication Part C1 C2 RIREF RMIN R1, R2 D1, D2 Fig2. Typical Application Circuit Interfacing to a MCU Part C1 C2 RIREF RMIN R1, R2 Component Description for Figure 2 Description 1μF X5R ceramic cap 1μF X5R ceramic cap 29.4kΩ, 1% for 135mA charge current 29.4kΩ, 1% for 27mA EOC current 100kΩ, 5% UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 10 QW-R502-A26.b UB10803 Preliminary CMOS IC UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 10 of 10 QW-R502-A26.b