LP3947ISD-51

LP3947 www.ti.com SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013 LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC Check for Samples: LP3947 FEATURES DESCRIPTION • • • • • • • • • • The LP3947 is a complete charge management system that safely charges and maintains a Li-Ion battery from either USB power source or AC adaptor. In USB mode, the LP3947 supports charging in low power or high power mode. Alternatively, the LP3947 can take charge from AC adaptor. In both USB and AC adaptor modes, charge current, battery regulation voltage, and End of Charge (EOC) point can be selected via I2C™ interface. The LP3947 can also operate on default values that are pre-programmed in the factory. The battery temperature is monitored continuously at the Ts pin to safeguard against hazardous charging conditions. The charger also has under-voltage and over-voltage protection as well as an internal 5.6 hr timer to protect the battery. The pass transistor and charge current sensing resistor are all integrated inside the LP3947. 1 23 Supports USB Charging Scheme Integrated Pass Transistor Near-Depleted Battery Preconditioning Monitors Battery Temperature Built-In 5.6 Hour Timer Under Voltage and Over Voltage Lockout Charge Status Indicators Charge Current Monitor Analog Output LDO Mode Operation can source 1 Amp Continuous Over Current/Temperature Protection APPLICATIONS • • • • • Cellular Phones PDAs Digital Cameras USB Powered Devices Programmable Current Sources The LP3947 operates in four modes: pre-qualification, constant current, constant voltage and maintenance modes. There are two open drain outputs for status indication. An internal amplifier readily converts the charge current into a voltage. Also, the charger can operate in an LDO mode providing a maximum of 1.2 Amp to the load. KEY SPECIFICATIONS • • • • • 1% Charger Voltage Accuracy Over 0°C ≤ TJ ≤ 85°C 4.3V to 6V Input Voltage Range 100 mA to 750 mA Charge Current Range, in Charger Mode 100 mA to 500 mA Charge Current Range, in USB Mode WSON Package Power Dissipation: 2.7W at TA = 25°C TYPICAL APPLICATION CIRCUIT USB Power Source 4.3V to 5.5V CHG-IN To System Supply BATT 1 PF Li-Ion 10 PF VBSense LP3947 CHG RT TS VT RS EOC Diff-Amp ISEL SCL MODE SDA EN GND More Application Circuit can be found in APPLICATION NOTES. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. I C is a trademark of Philips Semiconductor Corporation. All other trademarks are the property of their respective owners. 2 2 3 PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2004–2013, Texas Instruments Incorporated LP3947 SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. CONNECTION DIAGRAMS AND PACKAGE MARK INFORMATION 14 13 12 11 10 9 8 1 2 3 4 5 6 7 Figure 1. Package Number NHL0014B (Top View) PIN DESCRIPTIONS Pin # Name Description 1 EN Charger Enable Input. Internally pulled high to CHG-IN pin. A HIGH enables the charger and a LOW disables the charger. 2 SCL I2C serial Interface Clock input. 3 SDA I2C serial Interface Data input/out. 4 BATT Battery supply input terminal. Must have 10 µF ceramic capacitor to GND 5 VT Regulated 2.78V output used for biasing the battery temperature monitoring thermistor. 6 VBSENSE Battery Voltage Sense connected to the positive terminal of the battery. 7 MODE Select pin between AC adaptor and USB port. A LOW sets the LP3947 in USB port and a HIGH sets it in the AC adaptor. 8 Diff-Amp Charge current monitoring differential amplifier output. Voltage output representation of the charge current. 9 Ts Multi function pin. Battery temperature monitoring input and LDO/Charger mode. Pulling this pin to VT, or removing the thermistor by physically disconnecting the battery, sets the device in LDO mode. 10 EOC Active Low Open Drain Output. Active when USB port or AC adaptor is connected and battery is fully charged. For more information, refer to “LED Charge Status Indicators” section. 11 GND Ground 12 CHG Active Low Open Drain Output. Active when USB port or AC adaptor is connected and battery is being charged. For more information, refer to “LED Charge Status Indicators” section. 13 ISEL Control pin to switch between low power (100 mA) mode and high power (500 mA) mode in USB mode. This pin is pulled high internally as default to set the USB in 100 mA mode. This pin has to be externally pulled low to go into 500 mA mode. 14 CHG-IN Charger input from a regulated, current limited power source. Must have a 1 µF ceramic capacitor to GND Table 1. ORDERING INFORMATION Part Number Default Options Top-Side Markings LP3947ISD-09 ICHG = 500 mA L00061B VBATT = 4.1V EOC = 0.1C LP3947ISD-51 ICHG = 500 mA L00062B VBATT = 4.2V EOC = 0.1C 2 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Product Folder Links: LP3947 LP3947 www.ti.com SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013 LP3947 FUNCTIONAL BLOCK DIAGRAM ISEL Mode SDA CHG ON/OFF 2 I C and Digital Control SCL LED Driver EOC EN RSENSE CHG-IN BATT + Diff Amp Power FET Control VT Charger control LDO Mode Vref + - TS UTLO LDO Error Amp + OTLO + - ABSOLUTE MAXIMUM RATINGS (1) (2) If Military/Aerospace specified devices are required, contact the Texas Instruments Semiconductor Sales Office/ Distributors for availability and specifications. −0.3V to +6.5V CHG-IN All pins except GND and CHG-IN (3) −0.3V to +6V Junction Temperature 150°C Storage Temperature −40°C to +150°C (4) 1.89W Power Dissipation ESD (5) Human Body Model Machine Model (1) (2) (3) (4) (5) 2 kV 200V All voltages are with respect to the potential at the GND pin. Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is ensured. Operating Ratings do not imply verified performance limits. For specified performance limits and associated test conditions, see the Electrical Characteristics tables. Caution must be taken to avoid raising pins EN and VT 0.3V higher than VCHG-IN and raising pins ISEL, MODE, SCL and SDA 0.3V higher than VBATT. The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formula MM P = (TJ – TA)θJA, where TJ is the junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. The 1.89W rating appearing under Absolute Maximum Ratings results from substituting the Absolute Maximum junction temperature, 150°C, for TJ, 80°C for TA, and 37°C/W for θJA. More power can be dissipated safely at ambient temperatures below 80°C. Less power can be dissipated safely at ambient temperatures above 80°C. The Absolute Maximum power dissipation can be increased by 27 mW for each degree below 80°C, and it must be de-rated by 27 mW for each degree above 80°C. The human-body model is used. The human-body model is 100 pF discharged through 1.5 kΩ. Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Product Folder Links: LP3947 3 LP3947 SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013 www.ti.com RECOMMENDED OPERATING CONDITIONS (1) (2) CHG-IN 0.3V to 6.5V EN, ISEL, MODE, SCL, SDA, VT (3) 0V to 6V −40°C to +125°C Junction Temperature −40°C to +85°C Operating Temperature Thermal Resistance θJA Maximum Power Dissipation (1) 37°C/W (4) 1.21W Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is ensured. Operating Ratings do not imply verified performance limits. For specified performance limits and associated test conditions, see the Electrical Characteristics tables. All voltages are with respect to the potential at the GND pin. Caution must be taken to avoid raising pins EN and VT 0.3V higher than VCHG-IN and raising pins ISEL, MODE, SCL and SDA 0.3V higher than VBATT. Like the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The 1.21W rating appearing under Operating Ratings results from substituting the maximum junction temperature for operation, 125°C, for TJ, 80°C for TA, and 37°C/W for θJA into (1) above. More power can be dissipated at ambient temperatures below 80°C. Less power can be dissipated at ambient temperatures above 80°C. The maximum power dissipation for operation can be increased by 27 mW for each degree below 80°C, and it must be de-rated by 27 mW for each degree above 80°C. (2) (3) (4) ELECTRICAL CHARACTERISTICS Unless otherwise noted, VCHG-IN = 5V, VBATT = 4V, CCHG-IN = 1 µF, CBATT = 10 µF. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over the entire junction temperature range for operation, TJ = −40°C to +85°C. (1) (2) (3) Symbol Parameter Conditions Typ Limit Min Max 4.5 6 4.3 6 Units VCC SUPPLY VCHG-IN Input Voltage Range VUSB ICC Quiescent Current VOK-TSHD Adaptor OK Trip Point (CHG-IN) VUVLO-TSHD Under Voltage Lock-Out Trip Point VCHG-IN ≤ 4V 2 20 EOC = Low, adaptor connected, VBATT = 4.1V 50 150 VCHG-IN –VBATT (Rising) 60 VCHG-IN –VBATT (Falling) VOVLO-TSHD Over Voltage Lock-Out Trip Point Thermal Shutdown Temperature V µA mV 50 mV VCHG-IN (Rising) 3.95 3.6 4.3 V VCHG-IN (Falling) 3.75 3.4 4.1 V VCHG-IN (Rising) 5.9 VCHG-IN (Falling) 5.7 (2) Thermal Shutdown Hysteresis V 160 °C 20 BATTERY CHARGER ICHG Fast Charge Current Range Fast Charge Current Accuracy IPRE-CHG (1) (2) (3) 4 Pre-Charge Current ISEL = High, In USB Mode 100 ISEL = Low, In USB Mode 500 mA In AC Adaptor Mode 100 750 ICHARGE = 100 mA or 150 mA −20 +20 ICHARGE ≥ 200 mA −10 +10 % VBATT = 2V 45 70 mA mA All limits are specified. All electrical characteristics having room-temperature limits are tested during production with TJ = 25°C. All hot and cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying statistical process control. Specified by design. LP3947 is not intended as a Li-Ion battery protection device, any battery used in this application should have an adequate internal protection. Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Product Folder Links: LP3947 LP3947 www.ti.com SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS (continued) Unless otherwise noted, VCHG-IN = 5V, VBATT = 4V, CCHG-IN = 1 µF, CBATT = 10 µF. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over the entire junction temperature range for operation, TJ = −40°C to +85°C. (1) (2) (3) Symbol Parameter Conditions 100 mA to 450 mA, 0.1C EOC Only Typ (4) Limit Max −10 +10 mA % IEOC End of Charge Current Accuracy −20 +20 VBATT Battery Regulation Voltage (For 4.1V Cell) TJ = 0°C to +85°C 4.1 4.059 4.141 TJ = −40°C to +85°C 4.1 4.038 4.162 Battery Regulation Voltage (For 4.2V Cell) TJ = 0°C to +85°C 4.1 4.158 4.242 TJ = −40°C to +85°C 4.2 4.137 4.263 VCHG-Q Full Charge Qualification Threshold VBATT Rising, Transition from Pre-Charge to Full Current 3.0 VBAT-RST Restart Threshold Voltage (For 4.1V Cell) VBATT Falling, Transition from EOC, to PreQualification State 3.9 3.77 4.02 Restart Threshold Voltage (For 4.2V Cell) VBATT Falling, Transition from EOC, to PreQualification State 4.00 3.86 4.12 500 mA to 750 mA, All EOC Points RSENSE Internal Current Sense Resistance (2) tOUT Diff-Amp Output Charger Time Out VOL Low Level Output Voltage V 120 mΩ 1.2 ICHG = 50 mA 0.583 ICHG = 100 mA 0.663 ICHG = 750 mA 1.790 TJ = 0°C to 85°C 5.625 4.78 6.42 TJ = −40°C to +85°C 5.625 4.5 6.75 EOC, CHG Pins each at 9 mA V V Internal Current Sense Resistor Load Current ICHGMON Units Min A V 100 Hrs mV TEMPERATURE SENSE COMPARATORS VUTLO VOTLO Low Voltage Threshold High Voltage Threshold VLDO LDO Mode Voltage Threshold VT Voltage Output Voltage at Ts Pin, Rising 2.427 Voltage at Ts Pin, Falling 2.369 Voltage at Ts Pin, Rising 1.470 Voltage at Ts Pin, Falling 1.390 Voltage at Ts Pin, % of VT V V 97 % 2.787 V LDO MODE (Ts = HIGH) VOUT Output Voltage Regulation ILOAD = 50 mA 4.10 ILOAD = 750 mA 4.06 V LOGIC LEVELS VIL Low Level Input Voltage EN, ISEL, MODE VIH High Level Input Voltage EN, ISEL, MODE 2.0 IIL Input Current EN, ISEL = LOW IIH Input Current (4) 0.4 V −10 +10 µA MODE = LOW −5 +5 µA EN, ISEL, MODE = HIGH −5 +5 µA V The ±10 mA limits apply to all charge currents from 100 mA to 450 mA, to 0.1C End Of Charge (EOC). The limits increase proportionally with higher EOC points. For example, at 0.2C, the End Of Charge current accuracy becomes ±20 mA. Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Product Folder Links: LP3947 5 LP3947 SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS, I2C INTERFACE Unless otherwise noted, VCHG-IN = VDD = 5V, VBATT = 4V. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over the entire junction temperature range for operation, TJ = −40°C to +125°C. (1) (2) (3) Symbol VIL Parameter Conditions Low Level Input Voltage Typ Limit Min Max Units SDA & SCL (2) 0.4 0.3 VDD V VIH High Level Input Voltage SDA & SCL (2) 0.7 VDD VDD +0.5 V VOL Low Level Output Voltage SDA & SCL (2) 0 0.2 VDD V VHYS Schmitt Trigger Input Hysteresis SDA & SCL (2) 0.1 VDD V FCLK Clock Frequency (2) tHOLD Hold Time Repeated START Condition (2) 0.6 µs tCLK-LP CLK Low Period (2) 1.3 µs tCLK-HP CLK High Period (2) 0.6 µs Set-Up Time Repeated START Condition (2) 0.6 µs Data Hold Time (2) 300 ns tDATA-SU Data Set-Up Time (2) 100 ns tSU Set-Up Time for STOP Condition (2) 0.6 µs tTRANS Maximum Pulse Width of Spikes that must be Suppressed by the Input Filter of both DATA & CLK Signals. (2) tSU tDATA-HOLD (1) (2) (3) 400 50 kHz ns All limits are specified. All electrical characteristics having room-temperature limits are tested during production with TJ = 25°C. All hot and cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying statistical process control. Specified by design. LP3947 is not intended as a Li-Ion battery protection device, any battery used in this application should have an adequate internal protection. Prequalification to Fast Charge transition CC to CV transition 4.1V 0r 4.2V 1C 4.1V Battery Voltage Charge Current 3.9V 3V Battery Voltage Battery Current End of Charge Current 0.1C (Default) 50 mA Time RLED GLED ON OFF OFF ON Figure 2. Li-Ion Charging Profile 6 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Product Folder Links: LP3947 LP3947 www.ti.com SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013 APPLICATION NOTES LP3947 CHARGER OPERATION The LP3947 charge cycle is initiated with AC adaptor or USB power source insertion. If the voltage on the CHGIN pin meets under-voltage (VUVLO-TSHD), over-voltage (VOVLO-TSHD) requirements, and the Adaptor OK signal is detected, then pre-qualification cycle begins (see Figure 2). In this cycle, a safe current level, less than 70mA, is pumped into the battery while the voltage across the battery terminals is measured. Once this voltage exceeds 3.0V, the controller will initiate constant current fast charge cycle. If the CHG-IN pin is connected to an AC adaptor, the default charge current is 500 mA and I2C interface can be used to program this parameter. If the CHG-IN pin is connected to the USB port, constant current cycle will start with a default of 100 mA. During this cycle, the 5.6 hr safety timer starts counting. If the 5.6 hr safety timers times out during constant current cycle, charging is terminated. As the battery is charged during constant current mode, the voltage across pack terminal increases until it reaches 4.2V (or 4.1V). As soon as pack terminal reaches 4.2V (or 4.1V), the controller starts operating in constant voltage mode by applying regulated VBATT voltage across the battery terminals. During this cycle, the charge current, ICHG, continues to decrease with time and when it drops below 0.1C (default value), the EOC signal is activated indicating successful completion of the charge cycle. The EOC current can be programmed to 0.1C, 0.15C, or 0.2C. The default value is 0.1C. After completing the full charge cycle, the controller will start the maintenance cycle where battery pack voltage is monitored continuously. During the maintenance cycle, if the pack voltage drops 200 mV below the termination voltage, charge cycle will be initiated providing that the wall adaptor is plugged in and is alive. Charging terminates when the battery temperature is out of range. For more explanation, please refer to Ts PIN. The LP3947 with I2C interface allows maximum flexibility in selecting the charge current, battery regulation voltage and EOC current. The LP3947 operates in default mode during power up. See I2C INTERFACE for more detail. When charging source comes from the USB port, charging starts with 100 mA (low power mode, ISEL = high). The USB controller can set the ISEL pin low to charge the battery at 500 mA. A simple external circuit selects between an AC adaptor or the USB port. The circuit is designed with priority given to the AC adaptor. P-Ch MOSFET USB Port CHG-IN To System Supply BATT 1 PF Li-Ion 10 PF VBSense RS Wall Adaptor LP3947 1k 10k CHG TS RT VT EOC Diff-Amp EN SCL ISEL SDA GND Mode Figure 3. LP3947 with External Switch Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Product Folder Links: LP3947 7 LP3947 SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013 4.3V < VCHG-IN < 6.0V and VBATT < VCHG-IN www.ti.com 4.3V < VCHG-IN < 6V VBATT > VCHG-IN Ts t 2.7V Charger Off LED's Off 1.39V < Ts < 2.42V LDO Mode ICHG = 1.2A VBATT = 4.1V* RLED = On GLED = Off LED's Off Pre-Qualification Charge Current = 50 mA 1.39V