Fully Integrated High Currnet Lithium-Ion Battery Charger System

www.DataSheet4U.com POWER MANAGEMENT Description Fully Integrated High Current Lithium-Ion Battery Charger System Features K Fully integrated charger with FET pass transistor, K K K K K K K K K K K K K K K K K K K K K K K K K reverse-blocking diode, sense resistor and thermal protection 4.1V, 4.2V & Adjustable Output Voltage Programmable precharge, fastcharge & termination current Battery voltage controlled to 1% accuracy Soft-start for step load and adaptor plug-in Up to 1.5A continuous charge current Charge current monitor output from microcontroller or ADC Interface Input voltages range from 4.2V to 14V 0.1µA Battery leakage in shutdown and monitor modes Operates without a battery in regulated LDO mode Small 4mm x 4mm 16 lead MLP package Low thermal impedance of 50°C/watt ° Few external components Over current protection in all charging modes Over voltage protection All outputs able to drive LED’s and interface to host processor Remote Kelvin sensing at the battery terminal Small input & output filter capacitors Status output communicates charging and end of charge cycle Now Available in Lead-Free Packaging Charges Li-Ion, Li-Polymer, NiCd and NiMH Batteries 5+& The SC801 is a fully integrated, single cell, constant-current/constant-voltage Lithium-IonLi-Polymer battery charger management system. The SC801 has built in intelligence and extreme functionality. When the battery voltage is below 2.8V the charger operates in a precharge mode with a charging current of up to 125mA based on the ITERM pin resistor. This pre-charge mode is set to limit power dissipation due to an undercharged battery. When the battery voltage exceeds 2.8V, the charger enters a fast charge mode. In this mode, the SC801 delivers up to 1.5A to the battery based on the IPRGM pin resistor. The part also features current termination, ending the charge cycle when the battery is charged and the charge current drops below the current programmed by the ITERM pin resistor. In addition, the charge current can be monitored by the voltage on the IPRGM pin allowing a microcontroller or ADC to access the current information to determine when to externally terminate the charge cycle. Once the charge cycle is complete and terminates, the device enters the charge monitor mode where the output voltage of the battery is monitored. If this voltage drops below the recharge threshold the device will enter the fast charge mode again, to bring the battery to its fully charged state. Both the shutdown and monitor modes drain no more than 1uA from the battery guaranteed. The output voltage to the battery is controlled to within 1% of the programmed voltage for either 4.1V or 4.2V. The SC801 can also function as a general purpose current source or as a current source for charging nickelcadmium (NiCd) and nickel-metal-hydride (NiMH) batteries using external termination. Applications Typical Application Circuit C H AR G ER VIN 14 13 3 7 4 8 6 5 C1 1uF R1 R2 Cellular phones PDA’s and Handheld computers Handheld meters Charging stations Digital cameras 11 10 9 2 1 16 15 12 F A U LT C2 2 . 2 uF S TA TU S VC C CP VC C S TA T IPR GM OVP EN VPR GM I TE R M BSEN BIP VOU T GN D VOU T NC NC S C 80 1 C H AR GER PR ESEN T B A TTE R Y  2.8   • 88 Pre - Charge Current =     R2  Revision 3, April 2003  1.5   1.5   • 88 Fast - Charge Current =   • 1000 Termination Current =  R     1  R2  1 www.semtech.com 5+& POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Parameter VCC, EN to GND VOUT, VPRGM, IPRGM, CP, OVP, STAT, ITERM, BIP to GND Power Dissipation MLP (Derate 20mW/ °C above 85 °C) VOUT short to GND Thermal Resistance, Junction to Ambient Operating Junction Temperature Lead Temperature Storage Temperature (Soldering) 10 seconds ESD Rating (Human Body Model) Symbol Maximum -0.3 to 14.0 -0.3 to +6.0 Units V V W PD 2.5 Continuous θJ A TJ TLEAD TSTG ESD 50 150 235 -65 to 150 2 °C/W * °C °C °C kV * Tied to PCB with 1 Square Inch, 2 Ounce Copper Electrical Characteristics Unless otherwise noted: VCC = 4.75V - 5.25V Parameter Symbol Conditions Min 25°C Typ Max Min 4.2 4.2 TA (-40°C to +85°C) Units Max 14 6.5 2 25 mA V V Input Voltage Operating Voltage Operating Current VC C VOP ICC Charging Mode OVP, STATUS, CP = 0µA LDO Mode OVP, STATUS, CP = 0µA Battery Leakage Current Regulated Voltage Adjust Mode Feedback Voltage Battery Pre-Charge Current Battery Termination Current Battery Fast-Charge Current IVOUT VBAT V C C = 0V VPRGM = Logic High VPRGM = Logic Low VPRGM = External Divider VCC = 4.2V - 6.5V 0.1 4.20 4.10 3.0 82 4.16 4.06 2.97 72 38 450 750 1 4.24 4.14 3.03 92 52 550 850 µA V V P CI ITERM FCI ITERM Resistor R = 3.01k VBATTERY > 2.5V 45 500 800 mA IPRGM = 3.01k IPRGM = 1.87k VBATTERY = 3.8V Dropout Voltage = 550mV 2 mA  2002 Semtech Corp. www.semtech.com 5+& POWER MANAGEMENT Electrical Characteristics Cont. Unless otherwise noted: VCC = 4.75V - 5.25V Parameter Symbol Conditions 25°C (-40°C to +85°C) TA Units Min Battery Fast-Charge Current Limit IPROG Regulated Voltage VIN UVLO Rising Threshold Adjust Mode Threshold Voltage VBAT Precharge Threshold VBAT Recharge Threshold VIN OVP Rising Threshold VIN OVP Falling Threshold VIN OVP Hysteresis Over Temperature Shutdown Status Output Source Current Hysteresis = 10°C Pre-Charge or Fast-Charge VSTAT = 2.8V End of Charge, VSTAT= 0.25V No Adaptor or LDO mode, High Impedance OVP Output Source Current CP Output Source Current BSENSE Input Leakage Current STAT, OVP, CP Outputs VOH Load = 10mA Load = 1mA VOL EN, BIP, VPRGM Inputs VIH VIL Load = -500µA VCC > OVP VCC > UVLO VBAT - VBATTERY 2.8V < VBATTERY < VBAT Dropout voltage = 1V Typ Max Min Max 1.5** A V V mV 1.5 4.2 90 2.8 200 6.8 6.5 300 165 10 1 1 10 10 0.1 1.4 1.6 4.3 2.7 170 6.525 6.2 200 2.9 220 7.1 6.8 400 V mV V V mV °C mA mA µA mA mA 1 2.4 µA V 2.6 0.25 1.8 0.4 V V V ** Thermally Limited  2002 Semtech Corp. 3 www.semtech.com 5+& POWER MANAGEMENT Pin Configuration VOUT VOUT 16 BSEN VPRGM IPRGM ITERM 1 2 3 4 5 NC 6 GND 7 EN 8 BIP 15 VCC 14 VCC 13 12 NC CP STAT OVP Ordering Information DEVICE(1) SC801IMLTR SC801IMLTRT(2) SC801EVB(3) PACKAGE MLP16 MLP16 Evaluation Board TOP VIEW 11 10 9 Notes: (1) Only available in tape and reel packaging. A reel contains 3,000 devices. (2) TRT extension designates the lead-free leadframe package option. (3) Specify the desired IC part number when ordering. MLP16: 4X4 16 LEAD Pin Descriptions Pin # 1 2 3 4 5 6 7 8 Pin Name BSEN VPRGM IPRGM ITERM NC GND EN BIP Pin Function Battery voltage sense pin. Connect to battery terminal to Kelvin sense battery voltage. Do not leave this pin floating. Selectable voltage program pin. Logic low = 4.1V. Logic high = 4.2V. Resistor = adjustable. Charger current program pin in fast charge mode. Requires a resistor to ground to program fast-charge current. Selection for current termination and pre-charge current. Requires a resistor to ground to program pre-charge and termination current. No Connect Ground Device enable/disable pin. Logic high enables device. Logic low disables device. Input derived from external circuitry or microcontroller that signals Battery In Place. Logic high indicates Battery In Place and in charging mode. Logic low puts device into LDO mode. Do not leave this pin floating. Overvoltage fault flag if charger input voltage is higher than 6.5V This pin can Source 10mA. Charger Status Pin: Pre-charge (High), Fastcharge (High) and end of charge (Low). When in LDO mode this pin is high impedance. This pin can source 10mA. Charger present indicator, logic high when there is power to the VCC pins regardless of the Enable pin state. This pin can source 10mA. No Connect Supply pin, connect to adaptor power. Supply pin, connect to adaptor power. Charger output, connect to battery. Charger output, connect to battery. 4 www.semtech.com 9 10 11 12 13 14 15 16 OVP STAT CP NC VC C VC C VOUT VOUT  2002 Semtech Corp. 5+& POWER MANAGEMENT Block Diagram VCC 13,14 Fast Charge Enable EN 7 OVP 9 EN Control UV OV 1.2V Reference and OT SD GND 6 EN 1.2V 4.2V 100 1 100 0.1 Charge Pump + - 4.1V 15,16 VOUT + + STAT 10 CP 11 BIP 8 BSEN 1 Status 3.0V Vout + Termination 1.2V Vprog Detect V_FB + 4.2V 4.1V 3.0V 1.2V + + Termination VPRGM 2 + 4 ITERM 3 IPRGM  2002 Semtech Corp. 5 www.semtech.com 5+& POWER MANAGEMENT Applications Information Pre-Charge Mode Pre-charge mode is automatically enabled whenever the battery voltage is below 2.8V. It is primarily used to limit the power dissipation of the battery and the SC801 device whenever the battery is undercharged. As the battery begins to charge in this mode, the voltage of the battery will rise and when the 2.8V limit is reached, the SC801 will switch to the fast charge mode. The precharge current value is selected by the termination resistor on the ITERM pin. The maximum range of the precharge current is from 10mA to 125mA. Whenever the charger is in pre-charge or fast-charge the status LED will light indicating that the battery is being charged. The equation to select the pre-charge current is given by:  2.8   • 88 PCI =   R  TERM  Monitor Mode In the monitor mode the voltage of the battery will be monitored against the programmed voltage. This will occur after a battery has been fully charged and the device has shut off. If the voltage of the battery falls below the recharge threshold (specified at 200mV) the charger will activate and charge the battery to its programmed voltage. This means that it will enter the full charging sequence from fast-charge to terminating the charging cycle when the programmed termination curre