MP2672AGD-0000-P

MP2672A Boost Charger with Cell Balance for 2-Cell Lithium-Ion Batteries in Series DESCRIPTION FEATURES The MP2672A is a highly integrated, flexible switch-mode battery charger IC for Lithium-ion batteries with two cells in series. This makes it applicable for a wide range of portable applications.    When an input power supply is present, the MP2672A operates in boost mode to charge the battery with two cells in series. When charging is enabled, the MP2672A automatically detects the battery voltage and charges the battery in three phases: pre-charge, constant current charge, and constant voltage charge. Other features include charge termination and auto-recharge. The device also has a narrow voltage DC (NVDC) power structure. With a deeply discharged battery, the MP2672A regulates the system output to a minimum voltage level. This powers the system instantly while simultaneously charging the battery via the battery FET. The MP2672A provides a cell balance function. It can monitor the voltage across each cell, then equalize the cell’s voltages if the difference between the two cells exceeds the mismatch threshold. The device has two configuration modes: standalone mode and host-control mode. In standalone mode, the charging parameters can be configured by hardware pins. In host-control mode, the charging parameters can be configured by the I2C registers. Diverse and robust protections include a thermal regulation loop to decrease the charge current in case the junction temperature exceeds the thermal loop threshold, and battery temperature protection that is compliant with JEITA standards. Other safety features include input over-voltage protection (OVP), battery OVP, thermal shutdown, battery temperature monitoring, a watchdog timer, and a configurable backup timer to prevent prolonged charging of a dead battery. The MP2672A is available in a QFN-18 (2mmx3mm) package.                 4.0V to 5.75V Operating Input Voltage Up to 14V Sustainable Voltage Up to 2A Configurable Charge Current for Battery with 2 Cells in Series Compatible with Host-Control or Standalone Mode NVDC Power Path Management Configurable Input Voltage Limit Configurable Charge Voltage with 0.5% Accuracy No External Sense Resistor Required Integrated Cell-Balancing Circuit for Mismatched Cells Preconditioning for Fully Depleted Battery Flexible New Charging Cycle Initiation Charging Operation Indicator in Standalone Mode Missing Battery Detection in Host-Control Mode I2C Port for Flexible System Parameter Setting and Status Reporting in HostControl Mode Negative Temperature Coefficient (NTC) Pin for Temperature Monitoring Compliant with JEITA Standards Built-In Charging Protection and Configurable Safety Timer MOSFET Cycle-by-Cycle Over-Current Protection (OCP) Thermal Regulation and Thermal Shutdown Available in a QFN-18 (2mmx3mm) Package APPLICATIONS      Portable Handheld Solutions Point-of-Sale (POS) Machines Bluetooth Speakers E-Cigarettes General 2-Cell Applications All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are trademarks of Monolithic Power Systems, Inc. or its subsidiaries. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 1 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER TYPICAL APPLICATIONS Standalone Mode Use a resistor to connect the CV pin to AGND. Set the battery-full voltage according to Table 1. Table 1: Battery Voltage Settings RVBATT Range VBATT_REG 30kΩ to 35kΩ 8.4V 70kΩ to 75kΩ 8.6V 100kΩ to 105kΩ 8.7V 130kΩ to 135kΩ 8.8V SYS BST Q2 L1 VIN Q3 BATT SW Q1 CIN CBATT IN RH VLIM MP2672A RL ACOK MID VCC STAT VCC AGND CV RT1 NTC ISET RT2 RVBATT RISET PGND RNTC Figure 1: Typical Application in Standalone Mode MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 2 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER TYPICAL APPLICATIONS (continued) Host-Control Mode Connect the CV pin to VCC. Set the battery-full voltage according to the I2C register (see Figure 2). SYS BST Q2 L1 VIN Q3 BATT SW Q1 CIN CBATT IN RH VLIM MP2672A RL ACOK MID VCC STAT VCC AGND CV SDA MCU RT1 NTC SCL RT2 ISET RISET PGND RNTC Figure 2: Typical Application in Host Control Mode MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 3 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER ORDERING INFORMATION Part Number* Package Top Marking MSL Rating MP2672AGD-xxxx** EVKT-MP2672A QFN-18 (2mmx3mm) Evaluation kit See Below N/A 1 N/A *For Tape & Reel, add suffix –Z (e.g. MP2672AGD–xxxx–Z). **“-xxxx” is the register setting option. The factory default is “-0000”. This content can be viewed in the I2C Register Map section starting on page 28. For custom options, contact an MPS FAE to obtain an “-xxxx” value. TOP MARKING BNJ: Product code Y: Year code WW: Week code LLLL: Lot number EVALUATION KIT EVKT-MP2672A EVKT-MP2672A kit contents (items below can be ordered separately): # Part Number Item Quantity 1 EV2672A-D-00A MP2672A evaluation board 1 2 EVKT-USBI2C-02 bag Includes one USB to I2C communication interface, one USB cable, and one ribbon cable 1 3 Online resources Include datasheet, user guide, product brief, and GUI 1 Order directly from MonolithicPower.com or our distributors. Input Power Supply GUI USB Cable 2 USB to I C Communication Interface Ribbon Cable EV2672A-D-00A Battery Load Figure 3: EVKT-MP2672A Evaluation Kit Set-Up MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 4 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER ACOK CV STAT SDA SCL PACKAGE REFERENCE 18 17 16 15 14 SW 2 12 SW BST 3 11 SYS VCC 4 10 BATT ISET 5 6 7 8 9 MID PGND NTC 13 VLIM 1 AGND IN QFN-18 (2mmx3mm) MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 5 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER PIN FUNCTIONS Pin # Name Type (1) 1 IN P 2, 12 SW P 3 BST P 4 VCC P Internal LDO output pin. Bypass a 1µF ceramic capacitor from this pin to AGND. It is not recommended to pull more than 20mA from this pin. 5 ISET AI Charge current setting. Connect an external resistor from this pin to AGND to configure the charge current. This also limits the maximum charge current in hostcontrol mode. 6 AGND P Analog ground. 7 VLIM AI 8 NTC AI 9 MID P 10 BATT P 11 SYS P 13 14 15 PGND SCL SDA P DI DIO Input voltage limit feedback pin. Connect a resistor divider from IN to AGND to configure the minimum input voltage limit threshold. Battery temperature-sense input. Connect NTC to a negative temperature coefficient thermistor. Configure the temperature window with a voltage divider connected from VRNTC to NTC to AGND. Configurable JEITA thresholds are supported. See the Negative Temperature Coefficient (NTC) Thermistor section on page 23 for more details. Middle point of the high-side and low-side cells. The MID pin measures the voltage of each cell and provides a balance path for each cell. Connect MID to AGND to disable the cell balance function. Battery positive terminal. Connect a capacitor from BATT to PGND, and place it as close as possible to the IC. System output. Connect a capacitor from SYS to PGND, and place it as close as possible to the IC. Power ground. I2C interface clock pin. This pin is only valid if the CV pin is connected to VCC. I2C interface data pin. This pin is only valid if the CV pin is connected to VCC. 16 STAT DO Charging operation indicator. This pin is an open-drain output. 17 18 -------------- CV ---------------- ACOK AI DO Description Input power pin. Switching node. The SW pin is the middle point between the MP2672A’s high-side and low-side MOSFETs. Bootstrap. Connect a bootstrap capacitor between the BST and SW pins to provide a floating supply for the high-side FET driver. Operation mode and battery voltage control pin. Pull CV to VCC to configure the IC to host-control mode. Connect an external resistor to AGND to configure IC to standalone mode. In standalone mode, configure the battery-full voltage via the CV pin’s resistor. Valid input supply indicator. This pin is an open-drain output. It is pulled low when the input voltage exceeds the under-voltage lockout threshold (VIN_UVLO) and is below the over-voltage lockout threshold (VIN_OVLO). Note: 1) AI = analog input, DI = digital input, DO = digital output, DIO = digital input and output, P = power. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 6 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER θJA θJC ABSOLUTE MAXIMUM RATINGS (2) Thermal Resistance (7) BATT .............................................-0.3V to +14V SW .........................-0.3V (-2V for 50ns) to +14V SYS ...............................................-0.3V to +14V MID, IN ..........................................-0.3V to +12V BST to SW………….. ......................-0.3V to +5V All other pins to AGND ....................-0.3V to +5V Continuous power dissipation .......(TA = 25°C) (3) ................................................................. 1.78W Junction temperature ................................150°C Lead temperature (solder) ........................260°C Storage temperature…………...-65°C to +150°C QFN-18 (2mmx3mm) .............. 70 ...... 15... °C/W ESD Ratings Human body model (HBM) (5) .................. 2000V Charged device model (CDM) (6) ............... 250V Notes: 2) Exceeding these ratings may damage the device. 3) 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 can cause excessive die temperature, and the regulator may go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 4) The device is not guaranteed to function outside of its operating conditions. 5) Per ANSI/ESDA/JEDEC JS-001. 6) Per JESD22-C101. 7) Measured on JESD51-7, 4-layer PCB. Recommended Operating Conditions (4) IN to PGND………………………….. 4V to 5.75V BATT to PGND ..................................... Up to 9V ICC.......................................................... Up to 2A IDSCHG..................................................... Up to 3A ISYS ........................................................ Up to 2A Operating junction temp (TJ) .... -40°C to +125°C MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 7 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER ELECTRICAL CHARACTERISTICS VIN = 5V, TA = 25°C, unless otherwise noted. Parameter Input Power Characteristics Input over-voltage lockout (OVLO) threshold Input OVLO threshold hysteresis Input under-voltage lockout (UVLO) threshold Input UVLO threshold hysteresis Boost Converter VCC LDO output Low-side N-channel MOSFET on resistance High-side N-channel MOSFET on resistance Peak current limit for low-side N-channel MOSFET Valley current limit for highside N-channel MOSFET Operating frequency System regulation minimum voltage (VBATT_PRE + VTRACK) Battery track regulation voltage Symbol Condition Min Typ Max Units VIN_OVLO 5.75 6.0 6.25 V VIN rising 150 VIN_UVLO VIN falling 3.25 3.45 mV 3.65 150 VVCC VIN = 5V, IVCC = 20mA 3.5 V mV 3.6 3.7 V RON_Q1 54 70 mΩ RON_Q2 28 40 mΩ ILS_PK VIN=5V 6 7 A IHS_VL VIN=5V 5 6 A REG07H, bit[7] = 1 1100 1270 1440 kHz REG00H, bits[3:1] = 100, VBATT = 5V 6.55 6.7 6.85 V fSW VTRACK 300 mV Battery Charger Pre-charge threshold Pre-charge threshold hysteresis Pre-charge current VBATT_PRE REG00H, bits[3:1] = 000 REG00H, bits[3:1] = 100 REG00H, bits[3:1] = 111 5.9 6.25 6.6 VBATT falling IPRE VBATT = 5.9V 6.05 6.4 6.75 6.2 6.55 6.9 250 230 320 MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. V mV 410 mA 8 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER ELECTRICAL CHARACTERISTICS (continued) VIN = 5V, TA = 25°C, unless otherwise noted. Parameter Fast charge current Termination charge current Input minimum voltage regulation reference Battery charge voltage regulation Recharge threshold below VBATT_REG Battery pack over-voltage protection (OVP) threshold Battery pack OVP hysteresis SYS-to-BATT N-channel MOSFET on resistance Battery quiescent current ---------------- ICC ITERM Condition REG01H, bits[3:0] = 0101, RISET = 6kΩ REG01H, bits[3:0] = 1111, RISET = 6kΩ If ICC > 1.5A, as a percentage of ICC If ICC ≤ 1.5A (setting) VIN_MIN_REF VBATT_REG_ACC VBATT_REG = 8.3V, host-control mode, REG00H, bits[7:5] = 000 VBATT_REG = 8.4V, host-control mode: REG00H, bits[7:5] = 001, standalone mode: RVBATT = 30kΩ VBATT_REG = 8.8V, host-control mode: REG00H, bits[7:5] = 101, standalone mode: RVBATT = 135kΩ VBATT_REG = 8.2V, host-control mode, REG00H, bits[7:5] = 111 Min Typ Max Units 0.9 1 1.1 A 1.8 2 2.2 A 8 11 14 % 130 160 190 mA 1.18 1.2 1.22 V +0.50 % -0.50 VRECH VBATT_OVP 450 As a percentage of VBATT_REG 102 REG00H, bit[0] = 0 RON_Q3 IBATT_Q VIN < VIN_UVLO, VBATT = 8.4V, system no load 104 mV 105 150 % mV 22 31 40 mΩ 19 31 42 μA 400 mV 1 μA -------------- ACOK, STAT, pin output low voltage ---------------- Symbol Sinking 1.5mA --------------- ACOK, STAT, pin leakage current Connected to 5V MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 9 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER ELECTRICAL CHARACTERISTICS (continued) VIN = 5V, TA = 25°C, unless otherwise noted. Parameter Termination deglitch time Recharge deglitch time Symbol tTERM_DGL Cell balance starting voltage threshold Cell voltage high-to-low cell mismatch threshold Cell voltage high-to-low cell mismatch threshold hysteresis Cell voltage low-to-high cell mismatch threshold Cell voltage low-to-high cell mismatch threshold hysteresis Min tRECH_DGL Battery Temperature Monitoring (JEITA) NTC low temp rising threshold VCOLD NTC low temp rising threshold hysteresis NTC cool temp rising threshold VCOOL NTC cool temp rising threshold hysteresis NTC warm temp falling VWARM threshold NTC warm temp falling threshold hysteresis NTC hot temp falling threshold VHOT NTC hot temp falling threshold hysteresis Thermal Regulation and Protection Thermal shutdown TJ_SHDN temperature Thermal shutdown hysteresis Cell Balance Function Internal balance FET on resistance Condition Typ 180 Max 180 As a percentage of VCC 70 As a percentage of VCC As a percentage of VCC 62 72 63 39.4 40.4 64 34.5 % % 41.4 2.5 33.5 % % 2.2 As a percentage of VCC As a percentage of VCC ms 2.4 As a percentage of VCC As a percentage of VCC 71 Units ms % % 35.5 % As a percentage of VCC 2.5 % Rising threshold 150 °C Temperature falling 20 °C 2.1 Ω 1.3 Ω RON_BHS RON_BLS 2 VCELL_BAL I C-configurable, REG01H, bit[6] = 0 3.35 VCELL_DIFF_HTL REG01H, bit[5] = 0 3.5 3.65 V 50 70 mV 52 VCELL_DIFF_LTH REG01H, bit[4] = 0 50 mV 70 58 High-side cell OVP threshold VHCELL_OVP Low-side OVP threshold VLCELL_OVP As a percentage of the battery-full voltage As a percentage of the battery-full voltage mV mV 101 102.5 104 % 101 102.5 104 % MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 10 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER ELECTRICAL CHARACTERISTICS (continued) VIN = 5V, TA = 25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units 2 I C Communication Interface Input high threshold level VIH VPULL UP = 1.8V VIL VOL fSCL VPULL_UP = 1.8V ISINK = 5mA Input low threshold level Output low threshold level I2C clock frequency Timing Characteristics Clock frequency Watchdog timer(8) fCLK tWTD Safety charge timer tTMR Pre-charge timer REG02H, bits[5:4] = 01 I2C-configurable, REG02H, bits[2:1] = 11 1.3 V 0.4 0.4 400 16 V V kHz 131 40 kHz sec 20 hours 1 hours Note: 8) Guaranteed by design MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 11 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER TYPICAL CHARACTERISTICS IPRE vs. Junction Temperature ICC vs. Junction Temperature 600 2.50 450 2.00 ICC (A) IPRE (mA) VBATT = 5V 300 1.00 150 0.50 0 -50 0 50 100 TEMPERATURE (°C) -50 150 -25 0 25 50 75 100 125 150 TEMPERATURE (°C) VBATT_REG vs. Junction Temperature ITERM vs. Junction Temperature VBATT_REG = 8.4V 8.5 250 200 8.4 VBATT_REG (V) ITERM (mA) ICC=1A ICC=2A 1.50 150 100 50 8.3 8.2 ICC=1A ICC=2A 0 8.1 -50 0 50 100 TEMPERATURE (°C) 150 -50 150 Battery Cell OVP vs. Junction Temperature VBATT_PRE vs. Junction Temperature 6.5 0 50 100 TEMPERATURE (°C) 105 BATTERY CELL OVP THRESHOLD (%) VBATT_PRE (V) 104 6.4 103 102 6.3 LS_Cell_OVP 101 6.2 HS_Cell_OVP 100 -50 0 50 100 TEMPERATURE (°C) 150 -50 0 50 100 TEMPERATURE (°C) MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 150 12 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER TYPICAL PERFORMANCE CHARACTERISTICS Constant Current Mode Charge Efficiency Constant Voltage Mode Charge Efficiency VIN = 5V, fSW = 1200kHz , L = 1.5μH, (DCR = 10mΩ), ISYS = 0A VIN = 5V, fSW = 1200kHz, L = 1.5μH, (DCR = 10mΩ), VBATT = 8.4V, ISYS = 0A 1 1 0.95 0.95 EFFICIENCY EFFICIENCY VIN = 5V, TA = 25°C, unless otherwise noted. 0.9 0.85 0.9 0.85 ICC=2A ICC=1A 0.8 0.8 6.4 6.9 7.4 7.9 8.4 VBATT (V) 0 0.5 1 1.5 2 IBATT (A) Configurable Charge Current Standalone mode 2.5 2 ICC (A) 1.5 1 0.5 0 5 10 15 20 25 RISET (kΩ) MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 13 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VBATT_PRE = 6.5V, ICC = 2A, ISYS = 0A, VBATT = 0V to 8.4V, CIN = 10μF, CSYS = 44μF, CBATT = 22μF, L = 1.5μH, fSW = 1200kHz, TA = 25°C, unless otherwise noted. Battery Charge Curve Auto-Recharge VBATT_REG = 8.4V VBATT_REG = 8.4V CH2: VSYS 2V/div. CH1: VBATT 2V/div. CH2: VSYS 2V/div. CH1: VBATT 2V/div. CH4: IBATT 500mA/div. CH4: IBATT 500mA/div. ------------------ ------------------ CH3: STAT 2V/div. CH3: STAT 2V/div. 4s/div. 2s/div. Constant Current Charge Steady State Pre-Charge Steady State VBATT = 5V VBATT = 7.4V CH1: VBATT 2V/div. CH1: VBATT 2V/div. CH3: IBATT 500mA/div. CH3: IBATT 500mA/div. CH4: IL 1A/div. CH4: IL 1A/div. CH2: VSW 5V/div. CH2: VSW 5V/div. 1μs/div. 1μs/div. Constant Voltage Charge Steady State Constant Voltage Charge Steady State VBATT = 8.4V (1A) VBATT = 8.4V (0.5A) CH1: VBATT 2V/div. CH1: VBATT 2V/div. CH3: IBATT 500mA/div. CH3: IBATT 500mA/div. CH4: IL 1A/div. CH2: VSW 5V/div. CH4: IL 1A/div. CH2: VSW 5V/div. 1μs/div. 1μs/div. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 14 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VBATT_PRE = 6.5V, ICC = 2A, ISYS = 0A, VBATT = 0V to 8.4V, CIN = 10μF, CSYS = 44μF, CBATT = 22μF, L = 1.5μH, fSW = 1200kHz, TA = 25°C, unless otherwise noted. Start-Up through VIN Shutdown through VIN VBATT = 7.4V VBATT = 7.4V CH1: VIN 2V/div. CH1: VIN 2V/div. CH2: VBATT 2V/div. CH2: VBATT 2V/div. CH4: IBATT 1A/div. CH4: IBATT 1A/div. CH3: VSW 5V/div. CH3: VSW 5V/div. 40ms/div. 40ms/div. Boost Enabled Boost Disabled VBATT = 7.4V VBATT = 7.4V CH1: VIN 2V/div. CH1: VIN 2V/div. CH2: VBATT 2V/div. CH2: VBATT 2V/div. CH4: IBATT 1A/div. CH4: IBATT 1A/div. CH3: VSW 5V/div. CH3: VSW 5V/div. 40ms/div. 40ms/div. Constant Current Charge Enabled Constant Current Charge Disabled VBATT = 7.4V, MP2672A-0000 VBATT = 7.4V, MP2672A-0000 CH1: VBATT 2V/div. CH1: VBATT 2V/div. CH2: VSYS 2V/div. CH2: VSYS 2V/div. CH4: IBATT 1A/div. CH4: IBATT 1A/div. CH3: VSW 5V/div. CH3: VSW 5V/div. 20ms/div. 20ms/div. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 15 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, VBATT = 0V to 8.4V, CIN = 10μF, CSYS = 44μF, CBATT = 22μF, L = 1.5μH, fSW = 1200kHz, TA = 25°C, unless otherwise noted. Constant Current Charge Enabled Constant Current Charge Disabled VBATT = 7.4V, MP2672A-000E VBATT = 7.4V, MP2672A-000E CH1: VBATT 2V/div. CH2: VSYS 2V/div. CH1: VBATT 2V/div. CH2: VSYS 2V/div. CH4: IBATT 1A/div. CH4: IBATT 1A/div. CH3: VSW 5V/div. CH3: VSW 5V/div. 400μs/div. 20μs/div. Standard NTC Protection JEITA NTC Protection VBATT = 7.4V, standard NTC, ICC = 2A, vary V_NTC VBATT = 8.15V, JEITA NTC, ICC = 2A, vary V_NTC CH2: VBATT 2V/div. CH1: VNTC 1V/div. CH2: VBATT 2V/div. CH1: VNTC 1V/div. CH3: ------------------ ------------------ CH3: STAT 2V/div. STAT 2V/div. CH4: IBATT 1A/div. CH4: IBATT 1A/div. 4s/div. 4s/div. LS Cell Balance HS Cell Balance ICC = 1A, ISYS = 0A, HS cell is 3.6V and LS cell is 3.8V, balance enabled, balance resistor is 17mΩ ICC = 1A, ISYS = 0A, HS cell is 3.8V and LS cell is 3.6V, balance enabled, balance resistor is 17mΩ CH1: VMID 2V/div. CH1: VMID 2V/div. CH3: IBATTH 500mA/div. CH4: IBATTL 500mA/div. CH3: IBATTH 500mA/div. CH4: IBATTL 500mA/div. 200ms/div. 200ms/div. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 16 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER FUNCTIONAL BLOCK DIAGRAM CSYS SYS SW Q3 Q2 CIN BATT Q1 A1 BST iHS VIN Charge Pump PreCharge Loop A2 ILS Balance and Protection MID IBATT_FB TJ_FB EA1 TJ_REF VLIM VBATT_FB VBATT_REG CV Charge Parameter Setting VIN Junction Temp Loop IBATT_FB VCC LDO EA2 VCOMP Battery Voltage Loop PWM Controller EA3 ICC_REF Charge Current Loop VSYS_FB ISET NTC Protection NTC EA4 VSYS_REF System Voltage Loop VIN_FB EA5 1.2V AGND Input Voltage Loop STAT DAC Thermal Shutdown SCL SDA I2C Block and Register Control Logic ACOK Timer CV PGND Figure 4: Functional Block Diagram MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 17 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER OPERATION The MP2672A is a highly integrated switchmode battery charger IC that charges lithium-ion batteries with two cells in series from a 5V input power supply. This means it can be used with an adapter or USB input. Host-Control Mode and Standalone Mode The MP2672A can operate in either host-control mode or standalone mode. After the input starts up, the MP2672A checks the CV pin’s status. If CV is pulled up to logic high, the MP2672A works in host-control mode. If CV is connected to ground through a resistor, the MP2672A works in standalone mode. In host-control mode, the charging parameters (VBATT_REG and ICC) can be configured by the I2C registers. In standalone mode, they can be set by hardware pins. Table 2: Host-Control Mode vs. Standalone Mode CV Pin Mode VBATT_REG ICC Connected to AGND via resistor Standalone Set by CV resistor Set by ISET resistor Pulled up to VCC Hostcontrol Set by I2C register Set by I2C register (9) Note: 9) The maximum charge current is limited by the ISET pin, even in host-control mode. Internal Power Supply The VCC LDO is powered by the input power supply, and it powers the internal circuit and MOSFET driver. When the input is absent, the VCC LDO is off. An external capacitor must be connected from the VCC pin to AGND. The VCC output is regulated to about 3.6V when VIN is 5V. If VIN is below 3.6V, the LDO enters low-dropout mode, and the LDO FET fully turns on. The VCC output cannot handle current loads exceeding 20mA. Input Voltage vs. System Voltage Limitation To prevent the MP2672A from entering open-loop operation due to the low-side MOSFET’s minimum on time, the boost converter turns off if VSYS drops below 110% of VIN. The converter restarts, then checks the input voltage and system voltage again. The boost converter turns off again if VSYS is still below 110% of VIN after a 1ms soft-start time. It is recommended to choose VBATT_PRE and VTRACK to ensure that the minimum output voltage of the boost converter exceeds 110% of the maximum DC input voltage. Input Power Start-Up When the input voltage is below the undervoltage lockout threshold (VIN_UVLO), SYS is powered by the battery via Q3, which is fully turned on at this time. When input power is connected and VIN exceeds VIN_UVLO, Q3 stops being fully on and enters virtual diode mode. At the same time, the boost converter starts up with a soft start of the system voltage loop. When the system voltage rises to about 20mV above the battery voltage, Q3 turns off. It turns on again with a soft-start charging current after the system’s voltage soft start completes. Narrow Voltage DC (NVDC) Power Structure The MP2672A features a narrow voltage DC (NVDC) power structure that is comprised of a frond-end boost converter and a rear-end battery FET between the SYS and BATT pins. This allows for separate control between the system and the battery. The system is given the priority to start up, even with a deeply discharged or missing battery. When input power is available and a depleted battery is connected, the system voltage is regulated to the minimum system voltage (VSYS_MIN) which is set via REG00H, bits[3:1]. Figure 5 shows the system voltage control, described in detail below:  When the battery voltage (VBATT) is below VBATT_PRE, the system voltage is regulated to VSYS_REG_MIN = VBATT_PRE + VTRACK. The battery FET works linearly to charge the battery with the pre-charge current.  When VBATT is above VBATT_PRE, the battery FET is fully turned on, and the system voltage always exceeds VBATT by the value calculated with IBATT x RON_Q3. Once battery charging completes, the system output (VSYS) is regulated to VBATT + VTRACK. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 18 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER  When charging is disabled and REG00H, bit[4] = 0, VSYS is also regulated to VTRACK, which is greater than the real battery voltage. vSYS VTRACK VBATT_PRE vBATT Figure 5: VSYS Variation with VBATT Battery Charge Profile The MP2672A provides three main charging phases: constant current pre-charge, constant current fast charge, and constant voltage charge (see Figure 6). Phase 1 (Constant Current Pre-Charge): When VBATT is below the pre-charge to fast charge threshold (VBATT_PRE), the MP2672A regulates the system voltage to VSYS_REG_MIN. The part applies a safe pre-charge current (IPRE) to charge the deeply depleted battery until VBATT reaches VBATT_PRE. If VBATT_PRE is not reached before the pre-charge timer (60min) expires, the charge cycle ceases, and a corresponding timeout fault signal is asserted. Phase 2 (Constant Current Fast Charge): When VBATT exceeds VBATT_PRE, the MP2672A stops the pre-charge phase and enters the fast charge phase. The fast charge current can be configured via the ISET pin in standalone mode or via the I2C register in host-control mode. VTRACK System Voltage VBATT_REG VTRACK Battery Voltage VSYS_REG_MIN ICC Charge Current IPRE ITERM Pre-Charge Fast Charge Constant Voltage Charge Charge Termination Figure 6: Battery Charge Profile MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 19 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER Phase 3 (Constant Voltage Charge): When VBATT reaches the battery regulation voltage (VBATT_REG), the charge current begins to decrease (see Figure 7). The charge cycle is complete once the constant voltage loop is dominant, and the charge current drops below the charge termination current threshold for a 200ms deglitch time. This 200ms deglitch time is designed to start each charge cycle; after 200ms expires, the charge-full signal asserts whether the termination conditions have been met. VSYS VBATT VRECH Charging Done ITERM Charge Current 200ms Recharge Deglitch Time Charging Starts Figure 8: Recharging Profile Charging Enabled (Default Setting) If the battery is not expected to be charged frequently during high state of charge (SOC) conditions, the MP2672A has an one-time programmable (OTP) option (REG05H, bit[7]) to disable charging when the input power is on, and the battery voltage exceeds the recharge voltage threshold. Charging is enabled until the battery voltage falls below the recharge threshold. 200ms Soft Start Forced Charging Time a) Forced Charge Time VSYS VBATT_REG Charge Current VBATT ITERM 200ms Constant Voltage Termination Deglitch Time Charging Done b) Termination Deglitch Time Figure 7: Forced Charge Time and Termination Deglitch Time If ITERM is not reached before the safety charge timer expires (see the Safety Timer section on page 22), the charging cycle stops and the corresponding timeout fault signal is asserted. Charging termination can be manually disabled by pulling the NTC pin up to VCC. A new charging cycle starts when the following conditions are valid:     VBATT Charge Current VBATT_REG    Auto-Recharge When the battery is fully charged and charging is terminated, the battery may be discharged by system consumption or self-discharge (see Figure 8). The MP2672A automatically starts a new charging cycle (without requiring a manual charging cycle restart) when the battery voltage drops below the recharge threshold for 200ms. The input power is re-plugged in Auto-recharge is enabled The charging enable bit is toggled (only for host-control mode) There is no thermistor fault on the NTC pin There is no safety timer fault There is no battery over-voltage condition Thermal shutdown is not occurring Battery-Full Voltage Setting The MP2672A has a CV pin that can configure the battery regulation voltage. When CV is pulled up to VCC, the MP2672A operates in host-control mode. The battery regulation voltage is configured through the I2C. When CV is connected to AGND via a resistor, the MP2672A operates in standalone mode. The battery regulation voltage is set according to Table 3. Table 3: VBATT_REG vs. RVBATT Resistor VBATT_REG Resistor Range 30kΩ to 35kΩ 8.4V 70kΩ to 75kΩ 8.6V 100kΩ to 105kΩ 8.7V 130kΩ to 135kΩ 8.8V Figure 9 shows the simplified diagram. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 20 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER The internal reference of the input voltage loop is 1.2V, and VIN_MIN can be estimated with Equation (2): CV VTH1 VIN_MIN =1.2  Battery Voltage Reference VTH2 Decoding DAC VTH3 VTH4 Figure 9: Simplified Diagram of the VBATT_REG Setting in Standalone Mode Charge Current Setting In standalone mode, the charge current (ICC) is set by a resistor connected to the ISET pin (RISET). Calculate ICC with Equation (1): ICC = 12kΩ (A) RISET (1) In host-control mode, the charge current can be configured via RISET and REG01H, bits[3:0]. RISET determines the full-scale value of the register. For example, if RISET is 6kΩ, the I2C-configurable range is between 500mA and 2000mA, with 100mA per step. If RISET is 24kΩ, the I2Cconfigurable range is between 125mA and 500mA, with 25mA per step. RISET is recommended to be between 6kΩ and 24kΩ. Minimum Input Voltage Limit To avoid overloading the adapter, the MP2672A implements input voltage based power management by continuously monitoring the input voltage (VIN). When the minimum input voltage limit (VIN_MIN) is reached, the charge current is reduced to prevent VIN from dropping further. VIN_MIN can be configured by a voltage divider on the VLIM pin. RH +RL RL (2) Battery Supplement Mode and Virtual Diode Mode When VIN_MIN is reached, the charge current is reduced to keep VIN from dropping further. However, if the charge current drops to 0A and the input source is still overloaded due to a heavy system load, the system voltage (VSYS) continues dropping. If VSYS falls below VBATT, the MP2672A enters battery supplement mode. The battery starts to supplement the system load along with the boost converter. In supplement mode, the battery FET operates as a virtual diode. When VSYS falls 30mV below VBATT, the battery FET turns on, and its source-to-drain voltage is regulated at 24mV. As the battery discharge current rises, the virtual diode loop is saturated and the battery FET fully turns on. The sourceto-drain voltage is the discharge current times the on resistance of the battery FET. Missing Battery Detection The MP2672A is capable of detecting whether a battery is connected. The device detects a missing battery under the following conditions:    Charging is enabled Auto-recharge is triggered Recovery from any fault If a battery cannot be found, a 1Hz blinking on -------------the STAT pin indicates the missing battery condition, or the BATTFLOAT_STAT bit is set 1 in host-control mode. Figure 10 shows the battery missing detection flowchart. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 21 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER Enable Charge Counter A = 0 Start charging Has the timer expired? Timer initiates No Yes No Charging terminated? If A < 2, A = A+1 If A = 2, A = A+0 A=0 Yes Yes A = 2? Battery FET turns off No Yes No VBATT < VRECH? Battery missing Battery is present Figure 10: Missing Battery Detection Flowchart Battery Over-Voltage Protection The MP2672A is designed with a built-in battery over-voltage protection (OVP) threshold, which is 104% of VBATT_REG. If a battery OV event occurs, the MP2672A turns off the battery FET (Q3) and stops charging. At this time, the boost converter continues operating, and the system voltage tracks the battery voltage with additional VTRACK. When the balance function is enabled (the MID pin is not pulled down to AGND), the MP2672A uses the MID pin to monitor each cell’s voltage. Generally, if any one of the cell’s voltages exceeds 102.5% of VBATT_REG / 2, the MP2672A stops charging the battery. Safety Timer The MP2672A provides both a pre-charge and fast charge cycle safety timer to avoid an extended charging cycle due to abnormal battery conditions. When the battery is below VBATT_PRE, the safety timer for pre-charge is 60 minutes. The fast charge cycle safety timer starts when the battery enters fast charge mode. The fast charge safety timer can be configured or disabled via the I2C. writing 0 and 1 sequentially to the REG00H, bit[4]. The following actions restart the safety timer:     Beginning a new charge cycle Writing REG00H, bit[4] from 0 to 1 (charge enabled) Writing REG02H, bits[2:1] from 00 to 01/10/11 (safety timer enabled) Writing REG02H bit[3] from 0 to 1 (software reset) In the event of an NTC hot or cold fault, the charging timer is suspended. Once the NTC fault is removed, the timer continues to count from the value it was at before the NTC fault. Watchdog Timer When the MP2672A operates in host-control mode, a watchdog timer is provided to reset all the registers to their default values if the watchdog timer is not reset periodically. By doing this, the MP2672A’s register values return to their default settings when no action occurs on the I2C bus for a certain time. The watchdog timer duration can be configured and disabled via the I2C. The safety timer is reset at the beginning of a new charging cycle. It can also be reset by MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 22 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER Negative Temperature Coefficient (NTC) Thermistor The term thermistor refers to any thermally sensitive resistor, and a negative temperature coefficient (NTC) thermistor is generally called a thermistor. Thermistors can be used for multiple purposes, as their characteristics are different based on their manufacturing method, structure, and shape. Unless otherwise noted, the thermistor resistance values are classified at a standard temperature of 25°C. The resistance of a thermistor is solely a function of its absolute temperature. Refer to the thermistor’s datasheet for mathematic equation that calculates relationship between resistance and absolute temperature of the thermistor. It also be calculated with Equation (3):  1 1  β -   T1 T2  R1=R2  e the the the can different temperature window, described in detail below: 1. When VNTC < VHOT or VNTC > VCOLD, charging is suspended, and all timers are suspended. 2. When VHOT < VNTC < VWARM, the battery regulation voltage (VBATT_REG) is reduced by 120mV/cell from the configurable threshold. 3. When VCOOL < VNTC < VCOLD, the charging current is reduced to half of the configurable charge current. ICC Charge 0.5 x ICC Current VBATT_REG Charge Voltage VBATT_REG – 120mV/cell x 2 (3) Where R1 is the resistance at the absolute temperature T1, R2 is the resistance at the absolute temperature T2, and β is a constant that depends on the thermistor’s material. The MP2672A continuously monitors the battery’s temperature by measuring the voltage on the NTC pins. This voltage is determined by the voltage divider. The voltage divider ratio is determined by the NTC thermistor’s resistance values under different ambient battery temperatures. The MP2672A internally sets a predetermined upper and lower bounds of the temperature range. If the voltage at the NTC pin goes out of the hot or cold threshold, the temperature is outside its safe operating limit. At this time, charging ceases until the operating temperature returns to within its safe range. To satisfy JEITA requirements, the MP2672A monitors four temperature thresholds: the cold battery threshold (TNTC < 0°C), the cool battery threshold (0°C < TNTC < 10°C), the warm battery threshold (45°C < TNTC < 60°C), and the hot battery threshold (TNTC > 60°C). For a given NTC thermistor, these temperatures correspond to the VCOLD, VCOOL, VWARM, and VHOT values. Figure 11 shows the typical JEITA operation when the battery temperature is in a Cold Cool Warm Hot Figure 11: JEITA Compatible NTC Window For a given thermistor, two of four temperature thresholds can be configured by changing the values of RT1 and RT2. See the Selecting an NTC Sensor Resistor section on page 34 for more details. Thermal Regulation and Thermal Shutdown To guarantee safe operation, the MP2672A limits the die temperature. If the internal junction temperature reaches the preset threshold, the MP2672A starts to reduce the charge current to prevent greater power dissipation. When VBATT > VBATT_PRE, the die temperature limit is always set to 120°C. When VBATT < VBATT_PRE, the die temperature limit can be configured to multiple values (60°C, 80°C, 100°C, or 120°C), which can be configured by the one-time programmable (OTP) register (REG05H, bits[4:3]). If the junction temperature reaches 150°C, the boost converter enters shutdown mode. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 23 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER Indications --------------- The MP2672A has two open-drain pins (ACOK -------------- and STAT ) to indicate the input power and charging status. Table 4 shows the behavior for each of these indications. Table 4: Input Power and Charging Statuses Charging State Charging Charging complete, charging disabled Charging suspended due to one of the following:  Battery OVP  Timer fault  NTC hot fault  NTC cold fault  Battery floating Thermal shutdown ----------------- ---------------- ACOK Low STAT Low Low Open drain Low 1Hz blinking Low Open drain Battery Cell Balance and Protection The MP2672A provides battery cell balance and protection for dual-cell applications (see Figure 12). The part can sense the voltage across each cell. Generally, if these two cells have voltages that are mismatched by more than 50mV, the internal discharge path turns on to discharge the cell with the higher voltage until the two cell voltages have a difference that is below 30mV. If battery over-voltage protection (OVP) occurs before the two cells are equalized, charging is suspended. The MP2672A integrates the balance path and control circuit. An external power dissipation resistor is also required to limit the balance current. If the cell balance function is not used, connect MID directly to AGND. Balancing Algorithm The balance block only operates in charge mode. Balancing starts when any cell voltage exceeds the balance start point (VCELL_BAL). The voltage difference between cells should exceed VCELL_DIFF. The MP2672A detects the cell voltages in the pack, then checks the voltage difference between two cells. If the differential voltage exceeds VCELL_DIFF, the corresponding balance MOSFET turns on. To measure the open-circuit voltage of the cell, balancing is frequently suspended for a short duration. Charging always operates independently of the balance algorithm if no other charging fault occurs. The cell voltage is measured for 200µs when cell balancing is suspended. Then cell balancing operates for 249.8ms each 250ms cycle (see Figure 13). On On On Balance MOSFET Off Off On On On Cell Voltage Measurement Off Off 200µs Off 249.8ms Figure 13: Battery Balance Clock Figure 14 shows the battery balance flowchart. POR Turn off balancing path and measure the cell voltage BATT Any cell > VCELL_BAL? MID Balance and Protection PGND Figure 12: Battery Balance Block Diagram No Yes VCELL > VCELL_DIFF? No Yes Turn on the balancing path Figure 14: Battery Balance Flowchart MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 24 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER For extremely unbalanced dual-cell batteries, the charger takes a few cycles to balance the battery voltages. For some applications, such as removable dual-cell batteries, a charger is required to balance two cells in one charge cycle. In this case, an external cell-balance circuit is recommended (see Figure 15). The MP2672A also has an option to automatically disable termination if cell balancing is active. By doing this, the two cells are better matched once charging is terminated. The cell voltage measured within the 200µs time is also delivered to the battery cell OVP block. If OVP occurs, charging is suspended (the battery FET turns off) until the measured cell voltage drops below the recovery threshold, which is set by REG00H, bit[0]. Boost Converter Suspend Mode The MP2672A offers suspend mode to turn off the boost converter even when the input is present. In this mode, the SYS pin is powered by the battery through the internal battery FET, and the input quiescent current is optimized. The MP2672A enters this mode by setting REG02H, bit[0] to 0. The MP2672A-000E is preset to this mode. The boost is suspended if any of the following conditions occur:      Charging terminated Charging disabled An NTC fault has occurred A timer fault has occurred Battery over-voltage protection (OVP) has occurred BATT Balance Control MID PGND Figure 15: External Cell-Balancing Circuit Series Interface The IC uses two wires: a serial data (SDA) wire and serial clock (SCL) wire. All I2C master and slave devices are connected with these two wires. The master (e.g. a microcontroller or digital signal processor) generates the bus clock and initiates communication on the bus. The slave devices receive and respond to the bus commands from the master device. To communicate with a specific device, each slave device must have a unique bus address. The I2C interface supports both standard mode (up to 100kbits), and fast mode (up to 400kbits). The SDA and SCL pins are open drains. Both the SDA and SCL are connected to the positive supply voltage via a current source or pull-up resistor. When the bus is free, both lines are pulled high. The MP2672A’s SDA is a bidirectional line, and SCL is a unidirectional line. The data on the SDA line must be stable during the high period of the clock (see Figure 16). The high or low state of the data line can only change when the clock signal on the SCL line is low. One clock pulse is generated for each data bit transferred. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 25 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER SDA Change of data allowed Data line stable; data valid SCL Figure 16: Bit Transfer on the I2C Bus All transactions begin with a start (S) command and can be terminated by a stop (P) command. A start condition is defined as a high-to-low transition on the SDA line while SCL is high. A stop condition is defined as a low-to-high transition on the SDA line when the SCL is high (see Figure 17). Start and stop conditions are always generated by the master. The bus is considered busy after a start condition, and free after a stop condition. SDA SCL Start (S) Stop (P) Figure 17: Start and Stop Conditions Data on the I2C bus is transferred in 8-bit packets (bytes) (see Figure 18). Each byte must be followed by an acknowledge bit (ACK). Data is transferred with the most significant bit (MSB) first. An acknowledgement occurs after every byte. The acknowledge bit allows the receiver to signal to the transmitter that the byte was successfully received and another byte may be sent. All clock pulses, including the 9th acknowledge clock pulse, are generated by the master. Acknowledgement Signal from Receiver Acknowledgement Signal from Slave SDA MSB SCL Start or Repeated Start 1 2 7 8 9 1 2 ACK 8 9 ACK Stop or Repeated Start Figure 18: Data Transfer on the I2C Bus MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 26 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER The transmitter releases the SDA line during the acknowledge clock pulse so the receiver can pull the SDA line low. If it remains high during the 9th clock pulse, this is called a not acknowledge (NACK) signal. The master can then generate either a stop condition to abort the transfer, or a repeated start (S) to start a new transfer. indicates a transmission (write) and a 1 indicates a request for data (read). Figure 19 shows the complete data transfer. If the register address is not defined, the charger IC sends back a NACK signal and returns to the idle state. The MP2672A operates as a slave device with the address 4BH. The MP2672A supports single-byte R/W (see Figure 20 and Figure 21). After the start condition is received, a slave address is sent. This address is 7 bits long followed by an 8th data direction bit (R/W). A 0 SDA SCL Start 1–7 8 9 Address R/W ACK 1–7 8 9 1–7 ACK Data 9 8 Stop ACK Data Figure 19: Complete Data Transfer 1 bit 7 bits S Slave Address 1 bit 1 bit From Master to Slave 0 A 8 bits 1 bit 8 bits Register Address A Data From Slave to Master A = Acknowledge (SDA Low) 1 bit 1 bit A S = Start P P = Stop 2 Figure 20: I C Single Write 1 bit 7 bits S Slave Address 1 bit 1 bit 0 A 8 bits Register Address 1 bit 1 bit A S From Master to Slave A = Acknowledge (SDA Low) From Slave to Master /A = not Acknowledge (SDA High) 7 bits Slave Address 1 bit 1 bit 1 A 8 bits Data 1 bit 1 bit /A P S = Start P = Stop 2 Figure 21: I C Single Read MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 27 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER I2C REGISTER MAP IC Address 4BH Register Name Address R/W REG00H 0x00 R/W REG01H 0x01 R/W REG02H REG03H REG04H 0x02 0x03 0x04 R/W R R Description Default Battery regulation voltage, charge configuration, and SYS voltage setting register. Cell balance setting and charge current setting register. Timer setting register. Status register. Fault register. 0011 1000 1000 1111 1001 0101 0000 0000 0000 0000 REG 00H (Default: 0011 1000) Bit Name POR Reset by REG_RST Reset by WTD R/W Description 7 VBATT_REG[2] 0 Y Y R/W 000: 8.3V 001: 8.4V 010: 8.5V 011: 8.6V 100: 8.7V 101: 8.8V 110: 8.9V 111: 8.2V These bits set the battery regulation voltage. They are set to 001 by default. They are OTPconfigurable. This bit is set to 1 by default. 6 VBATT_REG[1] 0 Y Y R/W 5 VBATT_REG[0] 1 Y Y R/W 4 CHG_CON FIG 1 Y Y R/W 0: Charging disabled 1: Charging enabled 3 VBATT_PRE[2] 1 Y N R/W 0.4V 2 VBATT_PRE[1] 0 Y N R/W 0.2V 1 VBATT_PRE[0] 0 Y N R/W 0.1V 0 CELL_OVP _ HYS 0 Y N R/W 0: 80mV 1: 0mV Comment These bits set the system minimum voltage offset. It has a 6.0V offset, ranges between 6.0V and 6.7V, and is set to 6.4V by default. This threshold is also used as the pre-charge battery voltage threshold. It is OTP-configurable. The bit sets the cell overvoltage protection (OVP) hysteresis. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 28 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER REG 01H (Default: 1000 1111) Bit Name POR Reset by REG_RST Reset by WTD R/W Description Comment 7 NTC_TYPE 1 Y Y R/W 0: Standard 1: JEITA This bit is set to 0 by default. It is OTPconfigurable. R/W 0: 3.5V 1: 3.7V This bit sets the cellbalance start point. It is set to 0 by default, and is OTPconfigurable. R/W 0: 50mV 1: 70mV This bit sets the cellbalance threshold. It is set to 0 by default, and is OTPconfigurable. This bit sets the cellbalance threshold. It is set to 0 by default, and is OTPconfigurable. 6 VCELL_BAL 0 5 BALANCE_ THRESHOLD_ H2L 4 BALANCE_ THRESHOLD_ L2H 0 Y Y R/W 0: 50mV 1: 70mV 3 ICC[2] 1 Y Y R/W 800mA 2 ICC[2] 1 Y Y R/W 400mA 0 Y Y Y Y 1 ICC[1] 1 Y Y R/W 200mA 0 ICC[0] 1 Y Y R/W 100mA These bits set the fast charge current setting. If RISET is 6kΩ: These bits have a 500mA offset, a 500mA to 2000mA range, and are set to 1111 by default. If RISET is 24kΩ: These bits have a 125mA offset, a 125mA to 500mA range, are set to 1111 by default, and are OTPconfigurable. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 29 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER REG 02H (Default: 1001 0101) Bit Name POR Reset by REG_RST Reset by WTD R/W Description Comment 7 fSW 1 Y Y R/W 0: 600kHz 1: 1200kHz This bit is set to 1 by default. It is OTPconfigurable. 6 I2C_WD_ TIMER_ RESET 0 Y N R/W 0: Normal 1: Reset This bit is set to 0 by default. 5 WD_TIMER [1] 0 Y N R/W 4 WD_TIMER [0] 1 Y N R/W 00: Disable timer 01: 40s 10: 80s 11: 160s These bits set the I2C watchdog timer limit. They are set to 01 by default, and are OTP-configurable. 3 REGISTER_ RESET 0 Y N R/W 0: Keep current setting 1: Reset This bit is set to 0 by default. After a reset, this bit returns to 0 automatically. 2 CHG_TMR[1] 1 Y Y R/W 00: Disable charge timer 01: 8 hours 10: 20 hours 11: 12 hours These bits are set to 10 by default. 0: Enable suspended mode (disable the boost) 1: Disable suspended mode (enable the boost) This bit is set to 1 by default. 1 0 CHG_TMR[0] EN_SUSP 0 1 Y Y Y Y R/W R/W MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 30 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER REG 03H (Default: 0000 0000) Bit Name POR Reset by REG_RST Reset by WTD R/W 7 RESERVED N/A N/A N/A 6 RESERVED N/A N/A 5 CHG_STAT[1] 0 N/A Description Comment R Reserved. Reserved. N/A R Reserved. Reserved. N/A R 00: Not charging 01: Pre-charge 10: Constant current or constant voltage charge 11: Charging complete These bits are set to 00 by default. 4 CHG_STAT[0] 0 N/A N/A R 3 PPM_STAT 0 N/A N/A R 0: Not in PPM 1: in VIN PPM This bit is set to 0 by default. 2 BATTFLOAT_ STAT 0 N/A N/A R 0: Battery present 1: Battery missing This bit is set to 0 by default. 1 THERM_ STAT 0 N/A N/A R 0: Normal 1: Thermal regulation This bit is set to 0 by default. R 0: Not in VSYSMIN regulation 1: In VSYSMIN regulation This bit is set to 0 by default. 0 VSYS_STAT 0 N/A N/A MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 31 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER REG 04H (Default: 0000 0000) Bit Name POR Reset by REG_RST Reset by WTD R/W 7 WD_FAULT 0 N/A N/A 6 INPUT_FAULT 0 N/A 5 THERMSD_ FAULT 0 4 TIMER_FAULT 3 Description Comment R 0: Normal operation 1: The watchdog timer has expired This bit is set to 0 by default. N/A R 0: Normal operation 1: Input OVP has occurred This bit is set to 0 by default. N/A N/A R 0: Normal operation 1: Thermal shutdown This bit is set to 0 by default. 0 N/A N/A R 0: Normal operation 1: The safety timer has expired This bit is set to 0 by default. BAT_FAULT 0 N/A N/A R 0: Normal operation 1: Battery OVP has occurred This bit is set to 0 by default. 2 NTC_FAULT[2] 0 N/A N/A R 1 NTC_FAULT[1] 0 N/A N/A R These bits are set to 000 by default. 0 NTC_FAULT[0] 0 N/A N/A R 000: Normal operation 001: An NTC cold fault has occurred 010: An NTC cool fault has occurred 011: An NTC warm fault has occurred 100: An NTC hot fault has occurred MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 32 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER REG 05H (Default: 1110 0000) (10) Bit Name POR Reset by REG_RST Reset by WTD R/W Description Comment This bit is set to 1 by default. 7 RCHG 1 N/A N/A N/A 0: No charging after input start-up when VBATT > VRECH 1: Automatic charging after input start-up when VBATT > VRECH 6 RESERVED 1 N/A N/A N/A Reserved. Reserved. 0: Do not suspend termination when cell balancing is active 1: Suspend termination when cell balancing is active This bit is set to 1 by default. This bit is set to 00 by default. 5 BALANCE_ EOC_EN 1 N/A N/A N/A 4 TJ_REG[1] 0 N/A N/A N/A 3 TJ_REG[0] 0 N/A N/A N/A 00: 120°C 01: 100°C 10: 80°C 11: 60°C 2 RESERVED N/A N/A N/A N/A Reserved. Reserved. 1 RESERVED N/A N/A N/A N/A Reserved. Reserved. 0 RESERVED N/A N/A N/A N/A Reserved. Reserved. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 33 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER REG 06H (Default: 0000 0011) (10) Bit Name POR Reset by REG_RST Reset by WTD R/W Description Comment 7 RESERVED N/A N/A N/A N/A Reserved. Reserved. 6 RESERVED N/A N/A N/A N/A Reserved. Reserved. 5 RESERVED N/A N/A N/A N/A Reserved. Reserved. 4 RESERVED N/A N/A N/A N/A Reserved. Reserved. 3 RESERVED N/A N/A N/A N/A Reserved. Reserved. 2 RESERVED N/A N/A N/A N/A Reserved. Reserved. 1 RESERVED 1 N/A N/A N/A Reserved. Reserved. N/A When charging is suspended: 0: Disable DC/DC switching 1: Enable DC/DC switching This bit is set to 1 by default. 0 NVDC_MODE_ EN 1 N/A N/A Note: 10) This register is for OTP only. It is not accessible. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 34 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER OTP MAP # Bit[7] 00H Bit[6] Bit[5] Bit[4] VBATT_REG: 8.2V-8.9V 01H NTC Type VCELL_BAL 02H FSW N/A 05H (10) RCHG N/A 06H (10) N/A N/A Bit[3] N/A VCELL_DIFF_HL Bit[2] Bit[1] Bit[0] VBATT_PRE: 6.0V to 6.7V VCELL_DIFF_LH WATCHDOG N/A ICC: 500mA to 2000mA/100mA step (RISET = 6kΩ) N/A N/A N/A N/A BALANCE_ EOC_EN TJ_REG: 60°C, 80°C, 100°C , or 120°C N/A N/A N/A N/A N/A N/A N/A NVDC Mode_EN Note: 10) This register is for OTP only. It is not accessible. OTP DEFAULT OTP Items VBATT_REG VBATT_PRE NTC Type VCELL_BAL Balance Threshold H2L Balance Threshold L2H ICC SW FREQ WATCHDOG RCHG BALANCE_EOC_EN Thermal Regulation Threshold NVDC Mode_EN Default 8.4V 6.4V JEITA 3.5V 50mV 50mV 2000mA 1200kHz 40s New charge cycle starts after start-up when VBATT > VRECH Enabled (if the two cells are not balanced, EOC is not asserted, even all conditions are met) 120°C Enable DC/DC switching when charging is suspended MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 35 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER APPLICATION INFORMATION Setting the Charge Current in Standalone Mode In standalone mode, the MP2672A’s charge current (ICC) can be set by an external resistor (RISET). Estimate ICC with Equation (4): ICC = 12kΩ (A) RISET (4) RT2 = VCOLD  RT1  RL 1-VCOLD (8) Where VHOT is the high temperature threshold, VCOLD is the low temperature threshold, RH is the value of the NTC resistor at high temperatures within the required temperature operation range, and RL is the value of the NTC resistor at low temperatures. The charge current can be configured up to 2.0A. Table 5 shows the expected RISET value for typical charge currents. VCC Table 5: Charge Current Setting Table RISET (kΩ) ICC (A) 24 12 6 0.5 1.0 2.0 RT1 VCOLD NTC Protection RT2 Setting the Minimum Input Voltage Limit In charge mode, connect a voltage divider from IN to AGND, then tap it to VLIM to configure the minimum input voltage. Calculate the minimum input voltage with Equation (5): VIN_MIN =1.2V  RH +RL RL VIN_MIN -1.2V 1.2V (6) Selecting an NTC Sensor Resistor Figure 22 shows an internal voltage divider reference circuit that limits the high and low temperature thresholds for VHOT and VCOLD, respectively. For a given NTC thermistor, select the appropriate RT1 and RT2 values to set the NTC window. Calculate RT1 and RT2 using Equation (7) and Equation (8), respectively: (1-VCOLD )(1-VHOT )(RL -RH ) (1-VHOT )  VCOLD -(1-VCOLD )  VHOT RNTC VHOT AGND Figure 22: NTC Protection Block For example, if a 4.675V minimum input voltage limit is expected, RL = 10kΩ and RH = 28.7kΩ. RT1= VWARM (5) Where 1.2V is the reference of the minimum input voltage loop. With a given RL, RH can be estimated with Equation (6): RH =RL  NTC VCOOL RT1 and RT2 allow the high temperature limit and low temperature limit to be configured independently. With this feature, the MP2672A can use most types of NTC resistors with different temperature operation range requirements. The RT1 and RT2 values depend on the type of the NTC resistor. For example, the 103AT thermistor has the following electrical characteristics:   At 0°C, RNTC_COLD = 27.28kΩ At 60°C, RNTC_HOT = 3.02kΩ Based on Equations (7) and Equation (8), as well as the VHOT and VCOLD values from the electrical characteristics mentioned above, RT1 = 12.62kΩ, and RT2 = 3.63kΩ. Apply the spreadsheet calculation if required. for RT1 and RT2 (7) MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 36 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER Selecting the Inductor Inductor selection is a tradeoff between cost, size, and efficiency. A lower-value inductor results in lower DCR for components of a similar size, but results in higher current ripple, magnetic hysteretic losses, and output capacitances. The inductor ripple current should not exceed 30% of the maximum input current under the worst-case conditions. Choose an inductor that does not saturate under the worst-case load conditions. The inductor’s saturation current should be greater than the peak current limit of the low-side MOSFET. When the MP2672A works in charge mode, estimate the required inductance with Equation (9): L= VIN  (VSYS -VIN ) VSYS  fSW  ΔIL_MAX (9) Where VSYS is the system’s minimum regulation voltage, fSW is the switching frequency, and ∆IL_MAX is the peak-to-peak inductor ripple current, calculated with Equation (10): ΔIL_MAX =2  IL_PK -IIN(MAX)  (10) Where IL_PK is the expected inductor peak current, and IIN(MAX) is maximum input current, estimated with Equation (11): IIN(MAX) = VSYS  ISYS(MAX) VIN  (11) Where ISYS(MAX) is the maximum boost output current, and Ƞ is the boost efficiency. With an 8.4V battery voltage, 2A maximum charge current, 8.7V system voltage, typical input voltage (VIN = 5V), 1.2MHz switching frequency, 90% efficiency, and expected 4.5A inductor peak current, the inductance is calculated to be about 1.5μH. A 1.5µH inductor with >5A saturation current is recommended for applications with a 1.2MHz switching frequency. A 2.5µH inductor with >5A saturation current is recommended for applications with a 600kHz switching frequency. Selecting the Input Capacitor CIN is the boost converter’s input capacitor in charge mode. Calculate CIN with Equation (12): CIN  1-VIN / VSYS 8  fSW 2  L  ΔVIN /VIN (12) Where ∆VIN / VIN can be estimated with Equation (13): 1-VIN / VSYS ΔVIN  VIN 8  CIN  fSW 2  L (13) Assume the maximum input voltage ripple is 1%. When VSYS is 9.2V, VIN is 5V, L is 1µH, and fSW is 1200kHz, then CIN is calculated to be 4.7µF. Place one >4.7µF ceramic capacitor with X5R or X7R dielectrics at the IN terminal. Selecting the System Capacitor In charge mode, CSYS is the output capacitor of the boost converter. CSYS keeps the VSYS ripple small (8A, low DCR Package 0805 0805 1206 0603 0603 Manufacturer Any Any Any Any Any SMD Any MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 39 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER TYPICAL APPLICATION CIRCUITS (continued) CSYS 4.7μF CVCC 1μF Optional 100nF CBST L1 BST VCC Q2 SYS Q3 SW BATT 1.5μH CIN 10μF 22μF CBATT Q1 MID ACOK VIN MP2672A VLIM STAT SDA SCL CV ISET NTC PGND AGND RISET VCC RT1 RT2 NTC Figure 25: MP2672A-000E Application Reference Circuit for Charge Only Applications Table 7: Key BOM from Figure 25 Qty 1 1 1 1 1 Ref CIN CSYS CBATT CVCC CBST Value 10µF 4.7µF 22µF 1µF 100nF 1 L1 1.5µH Description Ceramic capacitor, 16V, X5R or X7R Ceramic capacitor, 16V, X5R or X7R Ceramic capacitor, 16V, X5R or X7R Ceramic capacitor, 10V, X5R or X7R Ceramic capacitor, 25V, X5R or X7R Inductor; 1.5µH, saturation current >8A, low DCR Package 0805 0805 1206 0603 0603 Manufacturer Any Any Any Any Any SMD Any MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 40 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER PACKAGE INFORMATION QFN-18 (2mmx3mm) PIN 1 ID MARKING PIN 1 ID 0.15X0.10 TYP PIN 1 ID INDEX AREA BOTTOM VIEW TOP VIEW SIDE VIEW 0.15X0.10 NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETERS MAX. 4) JEDEC REFERENCE IS MO-220. 5) DRAWING IS NOT TO SCALE. RECOMMENDED LAND PATTERN MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 41 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER CARRIER INFORMATION Pin1 1 1 ABCD 1 1 ABCD ABCD ABCD Feed Direction Part Number Package Description Quantity/ Reel Quantity/ Tube Quantity/ Tray Reel Diameter Carrier Tape Width Carrier Tape Pitch MP2672AGDxxxx–Z QFN-18 (2mmx3mm) 5000 N/A N/A 13in 12mm 8mm MP2672A Rev. 1.0 www.MonolithicPower.com 12/1/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 42 MP2672A – 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER Revision History Revision # 1.0 Revision Date 11/10/2020 Description Initial Release Pages Updated - Notice: The information in this document is subject to change without notice. Users should warrant and guarantee that thirdparty Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP2672A Rev. 1.0 www.MonolithicPower.com 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 43