MP2681GS

MP2681 CC/CV Controller with Full Protection and Indication One Chip Solution for Power Tools Applications The Future of Analog IC Technology DESCRIPTION FEATURES The MP2681 is a highly integrated Li-Ion or Lipolymer switch mode battery charge controller with full protection and status indication. This part integrates a precision voltage reference and charge status indications suitable for AC adapter input and cradle charger applications. • The MP2681 automatically detects the battery cell through a battery ID resistor and regulates the battery voltage according to the corresponding cell configurations: 3S1P, 3S2P, 4S1P, 4S2P, 5S1P and 5S2P. Then, the AC adapter output is automatically regulated according to the battery configuration chosen. Additionally, if the battery pack does not have an ID resistor, the charge termination voltage can be configured by setting a dedicated voltage to the ID pin according to the six pre-set values representing each battery VID configuration. The MP2681 charges the battery in three phases: pre-charge, constant current and constant voltage. Charge is terminated when the current reaches a minimum set level. An internal charge timer provides safety backup. The MP2681 provides a fixed pre-charge mode for deeply-discharged batteries and safety features that include battery temperature monitoring, NTC control, charge time-out and fault control. Constant Voltage and Constant Current Control Pre-Charge Mode for Deeply-discharged Battery Automatic Battery Cell Detection Two 1MHz Bandwidth Operational Amplifiers Output Connected with OR Logic Wide Input Voltage Range: 4.5V to 30V Auto-Recharge Charge On/Off Control Programmable Internal Timer Battery Temperature Monitoring Charge Status Indication Power Line Fault Detection Over Temperature Protection 16-pin SOIC Package • • • • • • • • • • • • APPLICATIONS • • Battery Charger for Portable Tools Standalone Fast Charger All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. MP2681 is available in a 16-pin SOIC package. TYPICAL APPLICATION MP2681 Rev.1.01 12/25/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1 MP2681 – CC/CV CONTROLLER WITH FULL PROTECTION ORDERING INFORMATION Part Number* MP2681GS Package SOIC16 Top Marking MP2681 * For Tape & Reel, add suffix –Z (e.g. MP2681GS–Z); PACKAGE REFERENCE SOIC16 ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VDD, COMP, BATT to GND ......... -0.3V to +36V CCON to GND………….. ............. -0.3V to +36V All Other Pins………………......... -0.3V to +6.5V (2) Continuous Power Dissipation (TA=+25°C) ……………………………………………1.6W Junction Temperature……………………..150°C Lead Temperature (Solder)...................... 260°C Storage Temperature…. ......... -65°C to +150°C SOIC16…………………………80…35 °C/W Recommended Operating Conditions (3) VDD to GND…………………………..4.5V to 30V Operating Junct. Temp. (TJ)..... -40°C to +125°C MP2681 Rev.1.01 12/25/2013 (4) θJA θJC Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 2 MP2681 – CC/CV CONTROLLER WITH FULL PROTECTION ELECTRICAL CHARACTERISTICS VDD= 18V, TA = 25°C, unless otherwise noted. Parameter Symbol Input UVLO Total Supply Current OPERATIONAL MPLIFIER Output Sink Current Output Leakage Current VOLTAGE REFERENCE VIN IDD Min Typ Max Units VDD = 18V, no load 4.1 0.4 4.5 0.5 4.9 0.6 V mA o Icomp_sink TA = 25 C, Vcomp=0.5V ICOMP_leakage LDO Output Voltage CHARGE CONTORL VLDO Pre-charge Threshold No-charge Threshold VPre_charge VNo_charge Battery Regulation Voltage Condition VBATT TA = 25 C ILDO=0mA to 20mA TA = 25°C Recharge Voltage Pre- Charge Current ITC Termination Charge Current IBF FLT Sink Current LEDR/LEDG Sink Current LEDR/LEDG Source Current PROTECTION NTC control window Pre-Charge Timer Total Charge Time Timer frequency VNTC Fast Charging MP2681 Rev.1.01 12/25/2013 μA 5.2 V 2.9 1.0 3.0 1.2 3.1 1.4 V/cell V/cell 4.125 4.15 4.175 V/cell 3.8 3.95 4.0 V/cell 175 5 10 mA 15 %ICC 30 %ICC 9 20 mA mA mA PIN voltage=0.4V PIN voltage=0.4V PIN voltage=VLDO-0.3V 8 RNTC=2.96k, 60°C RNTC=28.4k, 0°C RNTC=18.3k, 10°C 21 73 63 23 74 65 25 79 70 %VLDO %VLDO %VLDO 30 32 60 90 2 3 8 34 %VLDO min min hr hr hr RNTC=4.84k, 45°C CTMR=0.1µF,3S1P,4S1P,5S1P CTMR=0.1µF,3S2P,4S2P,5S2P CTMR=0.1µF,3S1P,4S1P,5S1P Fast Charge CTMR=0.1µF,3S2P,4S2P,5S2P CTMR=0.1µF,3S1P,4S1P,5S1P Slow Charge CTMR=0.1µF,3S2P,4S2P,5S2P CTMR=0.1μF VCCON_H VCCON_L 0.5 5.0 Slow Charging VBATT>VDD CCON Low Thershold mA 4.8 VBATTVBATT CCON High Thershold 15 o 12 15 VDD0.6V VBATT0.6V 0.3 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. hr Hz V V V 3 MP2681 – CC/CV CONTROLLER WITH FULL PROTECTION ELECTRICAL CHARACTERISTICS (continued) VDD= 18V, TA = 25°C, unless otherwise noted. Parameter Symbol Condition CCON Rise Time CCON Fall Time CR High logic CR Low logic (5) Thermal Shutdown tr_CCON tf_CCON VCRH VCRL TSHTDWN VCCON:10% to 90% CCCON=10nF VCCON:90% to 10% CCCON=10nF Fast Charge Slow Charge Min Typ Max Units 435 50 500 100 μs μs V V °C 2.5 0.4 150 Notes: (5). Guaranteed by design MP2681 Rev.1.01 12/25/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 4 MP2681 – CC/CV CONTROLLER WITH FULL PROTECTION TYPICAL PERFORMANCE CHARACTERISTICS VDD = 18V, TA = 25°C, unless otherwise noted. VDD 5V/div. VDD 5V/div. VBATT 5V/div. VBATT 5V/div. VLEDG 5V/div. VLEDG 5V/div. IBATT 2A/div. IBATT 2A/div. VDD 2V/div. VBATT 2V/div. VDD 5V/div. VBATT 5V/div. VLEDG 2V/div. VDD 2V/div. VBATT 2V/div. VLEDG 2V/div. IBATT 500mA/div. VDD 5V/div. VBATT 5V/div. VLEDG 2V/div. IBATT 2A/div. VDD 5V/div. VBATT 5V/div. VCCON 5V/div. IBATT 2A/div. MP2681 Rev.1.01 12/25/2013 IBATT 2A/div. VDD 5V/div. VCCON 5V/div. VLEDG 2V/div. IBATT 2A/div. VDD 10V/div. VCCON 10V/div. VLEDG 2V/div. VLEDG 5V/div. IBATT 100mA/div. IBATT 2A/div. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 5 MP2681 – CC/CV CONTROLLER WITH FULL PROTECTION TYPICAL PERFORMANCE CHARACTERISTICS (continued) VDD = 18V, TA = 25°C, unless otherwise noted. VDD 5V/div. VCCON 5V/div. VDD 10V/div. VCCON 10V/div. VLEDG 5V/div. IBATT 200mA/div. VCCON 10V/div. VLEDG 5V/div. VLEDG 5V/div. IBATT 5A/div. IBATT 1A/div. VDD 5V/div. VCCON 10V/div. VDD 10V/div. VDD 10V/div. VCCON 10V/div. VDD 10V/div. VCCON 10V/div. VLEDG 5V/div. VLEDG 5V/div. VLEDG 5V/div. IBATT 200mA/div. IBATT 5A/div. IBATT 1A/div. VNTC 2V/div. VDD 5V/div. VCCON 10V/div. VNTC 2V/div. VTMR 1V/div. VLEDG 5V/div. VCCON 5V/div. IBATT 2A/div. MP2681 Rev.1.01 12/25/2013 IBATT 2A/div. VDD 10V/div. VCCON 10V/div. IBATT 100mA/div. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 6 MP2681 – CC/CV CONTROLLER WITH FULL PROTECTION TYPICAL PERFORMANCE CHARACTERISTICS (continued) VDD = 18V, TA = 25°C, unless otherwise noted. VTMR 1V/div. VDD 10V/div. VCCON 10V/div. IBATT 2A/div. VDD 5V/div. VTMR 1V/div. VLEDG 5V/div. VLEDR 5V/div. IBATT 2A/div. VDD 5V/div. VID 2V/div. VCCON 5V/div. VID 2V/div. IBATT 2A/div. IBATT 2A/div. MP2681 Rev.1.01 12/25/2013 VID 2V/div. IBATT 200mA/div. VDD 5V/div. VLEDG 5V/div. VLEDR 5V/div. VID 2V/div. VCCON 5V/div. IBATT 2A/div. IBATT 200mA/div. VNTC 2V/div. VNTC 2V/div. VDD 5V/div. VCCON 10V/div. VCCON 5V/div. VLEDG 5V/div. VCCON 5V/div. IBATT 2A/div. VTMR 1V/div. VDD 10V/div. VCCON 10V/div. IBATT 100mA/div. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 7 MP2681 – CC/CV CONTROLLER WITH FULL PROTECTION PIN FUNCTIONS Package Pin # Name Description 1 2 3 VDD NC GND 4 VFB Power Supply Input. Bypass VDD to GND with a capacitor, at least 4.7μF. No Connected. Ground Voltage feedback pin. Connect this pin to the compensation of the voltage regulation loop externally. 5 COMP 6 IFB Current feedback. Connect to current sense resistor. 7 LEDR Charging status Indicator. (See table 3 for indication) 8 LEDG 9 CR 10 ID 11 NTC 12 TMR Charging status Indicator. (See table 3 for indication) Charge Rate Setting Pin. Pull it to logic high to set the charger in fast charge or logic low to set the charger in slow charge. Floating this pin sets the charger in fast charge as default setting. Connect to the ID resistor output pin of the battery pack. This pin is used to detect the battery type. Battery temperature monitoring pin. Please see Fig 2 for proper connection. Timer setting pin. Connect a capacitor from this pin to GND to set the oscillator cycle. The Timer setting period changes according to oscillation cycle. Short this pin to ground to disable the timer. 13 LDO 14 15 16 Output pin common to voltage regulation and current limitation loops. Connect to the cathode of the opto-coupler. LDO output for pulling high voltage of NTC, FLT and ID pins. Drain output pin to detect a charge fault condition. . It is pulled low when any fault happens. FLT Connect this pin to the battery pack pin if available. Pull FLT high to LDO pin through a resistor. BATT Battery Sense Voltage input. External charge on/off control MOSFET gate control pin. This pin cuts off the charge path CCON when any fault happens or protection is triggered. MP2681 Rev.1.01 12/25/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 8 MP2681 – CC/CV CONTROLLER WITH FULL PROTECTION OPERATION BT+ T1 Flyback Primary C LED + NTC Charge On/Off Control CR Current Reference To Primary Voltage Reference Indication Fixed Pre-Charge ... ID Temperature Sense Control Core CC/ CV Control BT- RSEN Battery Detection Current Sense Voltage Sense V BATT Figure 1 — Functional Block Diagram Charge Voltage Setting The MP2681 can support 6 different types of battery configurations: 3S1P, 3S2P, 4S1P, 4S2P, 5S1P and 5S2P using a dedicated ID resistor pin. When a battery pack configuration is detected through the ID resistor, the charge voltage is automatically set internally, different battery pack implementations require different ID resistor values. The ID pin of the MP2681 is connected to the ID resistor in the battery pack and pulled up to the LDO pin by a 20kΏ resistor as shown in Figure 2. Every battery configuration will have a pre-set Vid value. As such, the MP2681 will compare VID to its internal reference to figure out the inserted battery configuration. As the battery changes among the six pre-set configurations the MP2681detects such condition, and automatically modifies the resistor divider from VDD pin as shown in Figure 3. Charge current as well as other charge parameters will change accordingly. MP2681 Rev.1.01 12/25/2013 Figure 2 — Battery Pack Pin Connection Additionally, if the battery pack does not have an ID resistor, the charge termination voltage can be configured by setting a dedicated voltage to the ID pin according to the six pre-set VID values representing each battery configuration www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 9 MP2681 – CC/CV CONTROLLER WITH FULL PROTECTION Table 1 is a summary of all the charge voltage setting for the MP2681. The real ID voltage threshold for every battery pack is about ±65mV wider than the ones listed in the table taking in consideration reference variations, comparator offsets and hysteresis. Table1: Charge Voltage Setting Summary ID resistor Float 73.2k 28.7k 13k 7.87k 3.9k 1.62k Short Detect Voltage VID>4.145V 3.534V