MP1499GD-P

MP26057 28V, 1A Linear Li-lon Travel Charger With Trickle Charge and Timer The Future of Analog IC Technology DESCRIPTION FEATURES The MP26057 is a linear, high performance single cell Li-Ion or Li-Polymer battery charger. By integrating high voltage input protection into the charger IC, the MP26057 can tolerate an input surge up to 28V.                The device features constant current (CC) and constant voltage (CV) charging modes with programmable charge currents (200mA to 1A), current blocking and trickle charge. The other features include the programmable battery full threshold, termination and auto-recharge. MP26057 provides charger status indication to drive red and green LEDs (tri-color indication). For guaranteed safe operation, the MP26057 limits the die temperature to a preset value when the device is heated up due to limited PCB space. Other safety features are battery temperature monitoring, and programmable timer to prevent prolonged charging a dead battery. Complete Solution for Charging Single-Cell Lion-Ion Battery Input Surge Up to 28V Wide Input Operating Range 3.5V – 7V Adapter or USB Input Programmable Charge Current: 200mA to 1A Programmable Timer Termination and Auto-Recharge 0.75% VBATT Accuracy over Temperature 1.1V R_NTC at 0°C R_NTC at 50°C Oscillation Freq TMR Pin Source Current TMR Pin Sink Current NTC Up Range Hysteresis NTC Low Range Hysteresis 3.9 VRECHARGE TH114H104F TH114H104F Itmr1 Itmr2 Max Units mA 1 µA 0.25 105 Soft-Start Time Recharge Voltage Threshold Recharge Voltage Hysteresis Typ 120 V 135 °C 10 °C 100 ms 4.0 4.1 V 100 mV Note: R_NTC is 100k at 25°C 376.6 kΩ Note: R_NTC is 100k at 25°C 32.3 kΩ CTMR = 2.2μF VTMR=0.1V VTMR=1.5V VNTC Rising 18 18 2.05 VNTC Falling 0.27 5 20 20 2.15 150 0.3 30 22 22 2.25 0.33 Hz µA µA V mV V mV Notes: 4) ICHG is the target preprogrammed charge current (Die temperature below 110°C). 5) IBF is the target preprogrammed battery full current threshold MP26057 Rev. 1.0 12/21/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 3 MP26057- 28V, 1A LINEAR LI-ION TRAVEL CHARGER WITH TRICKLE CHARGE AND TIMER PIN FUNCTIONS Pin # Name Description 1 2 3 IN GRN RED 4 TMR Input Supply Pin. IN receives the AC adapter. Open-Drain Charger Status Indicator. Open-Drain Charger Status Indicator. Oscillator Period Timer. Connect a timing capacitor between this pin and GND to set the oscillator period. Short this pin to ground to disable timer. 5 6 7 8 9 10 GND， Exposed Ground. The exposed pad and GND pin must be connected to the same ground plane. Pad SS Soft Start Pin. Connect to a 0.1µF or higher capacitor to program the soft start time Constant Charge Current Program Pin. Connect this pin to an external resistor to program the ISET charging current in CC Mode. Charge Status Threshold Program. Connect this pin to an external resistor to program the IBF charge termination current or battery full indication threshold. Negative Temperature Coefficient (NTC) Thermistor Pin. Connect a 500kΩ resistor from this pin to the IN pin and a 100kΩ NTC resistor (within the battery pack) from this pin to ground. If NTC NTC function is not used, replace NTC resistor with a regular 100kΩ resistor from this pin to ground. Do not leave this pin floating. BATT MP26057 Rev. 1.0 12/21/2018 Charger Output. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 4 MP26057- 28V, 1A LINEAR LI-ION TRAVEL CHARGER WITH TRICKLE CHARGE AND TIMER TYPICAL PERFORMANCE CHARACTERISTICS VIN = 5V, CIN = 4.7µF, COUT = 2.2µF, IBF = 20kΩ, TA = +25ºC, unless otherwise noted. Constant Voltage Charge 200mA Charge Curve 900 4.5 270 4.5 800 4.0 240 4.0 700 3.5 210 3.5 600 3.0 180 3.0 500 2.5 150 2.5 400 2.0 120 2.0 300 1.5 90 1.5 200 1.0 60 1.0 100 0.5 30 0.5 0 0 20 40 60 80 TIME (Min) CHARGE CURRENT (mA) CHARGE CURRENT (mA) 800mA Charge Curve 0 0 100 120 0 50 4.200 CHARGE CURRENT (mA) CHARGE CURRENT (mA) ICHG=1A 800 ICHG=0.8A 600 420KHz ICHG=0.5A 400 200 0 ICHG=0.2A 0 1 2 3 4 4.175 4.170 1.5 1.2 0.9 ICHG=0.8A 600 0.6 ICHG=0.5A 400 0.3 200 ICHG=0.2A 2.7 3.0 3.3 3.6 3.9 0 4.2 2.0 1200 0.5 1000 0.4 800 0.3 600 0.2 400 0.1 MP26057 Rev. 1.0 12/21/2018 3.0 3.5 4.0 4.5 0 570 CHARGE CURRENT (mA) CHARGE CURRENT (mA) 0.6 2.5 200 400 600 800 1000 1200 CHARGE CURRENT (mA) ICHG=1A 800 1400 2.0 0 Battery Sink Current RSET Resistance vs. ISET 200 1.5 ICHG=0.2A 4.180 0 100 150 200 250 300 TIME (Min) 1000 0 5 ICHG=1A 4.185 1200 1000 ICHG=0.5A 4.190 Constant Current Charge 1200 ICHG=0.8A 4.195 0 200 400 600 ISET ( mA ) 800 1000 2.5 3.0 3.5 4.0 4.5 Constant Current Charge vs. Temperature 560 550 540 530 520 -40 -10 20 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 50 80 110 5 MP26057- 28V, 1A LINEAR LI-ION TRAVEL CHARGER WITH TRICKLE CHARGE AND TIMER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 5V, CIN = 4.7µF, COUT = 2.2µF, IBF = 20kΩ, TA = +25ºC, unless otherwise noted. 4.25 Constant Voltage Charge vs. Temperature 4.23 Maximum Input Voltage Short Circuit VIN=28V, No Battery No Battery VIN 5V/div VGRN 5V/div VIN 20V/div 4.21 VARED 5V/div 4.19 VBAT 5V/div VGRN 5V/div IIN 20mA/div 4.17 4.15 -40 -10 20 50 80 110 ICHG 0.5A/div 100ms/div 2ms/div Short Circuit Recovery No Battery VIN 5V/div VGRN 5V/div VIN 5V/div VRED 5V/div VIN 5V/div VRED 5V/div VBAT 5V/div VBAT 5V/div VBAT 5V/div ICHG 0.5A/div ICHG 0.5A/div 20ms/div VIN 5V/div VCHG 2V/div VBAT 2V/div ICHG 50mA/div MP26057 Rev. 1.0 12/21/2018 ICHG 0.5A/div 100ms/div 20ms/div VIN 5V/div VCHG 2V/div VBAT 2V/div ICHG 0.5A/div www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 6 MP26057- 28V, 1A LINEAR LI-ION TRAVEL CHARGER WITH TRICKLE CHARGE AND TIMER BLOCK DIAGRAM IN VIN CIN 1 R1 NTC 9 BATT I BATT RNTC 10 TMR CTMR ISET 8.2V 4 BATTERY CHARGE CONTROL COUT 2 8 RCHG 8.2V IBF GRN RED 3 7 RBF 5 6 GND Css Figure 1: Functional Block Diagram MP26057 Rev. 1.0 12/21/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 7 MP26057- 28V, 1A LINEAR LI-ION TRAVEL CHARGER WITH TRICKLE CHARGE AND TIMER OPERATION Input Voltage Range The MP26057 has built-in input voltage surge protection as high as +28V. The charger IC will be automatically enabled when the input voltage is higher than 3.0 and lower than 7.0V. If the input voltage is lower than the battery voltage, the IC is also disabled to prevent the battery from draining. Charge Cycle (Mode Change: Trickle -> CC-> CV) Figure 2 below shows the typical charging profile for the MP26057. For a fully depleted battery with a terminal voltage lower than 2.6V, the MP26057 will start with the trickle charge (preconditioning) at 10% of the full charge current based on the value of RPGM. If the charger stays in the trickle mode longer than 32768 cycles, RED/GRN pins become flashing indicating battery fault. After the battery voltage reaches 2.6V, the charger begins charging at the constant current of the programmed value (ICHG). This is referred to as Constant Current (CC) mode. Once the battery voltage reaches 4.2V, the charger will operate in the constant voltage (CV) mode until the battery is fully charged. The charge current drops during CV mode, and the battery full indication is set when the charge current reduced to the preset value based on RIBF, and the charge process terminated. Recharge will start after the battery voltage is for some reason reduced to 4.0V. After 262144 cycles of continuous charging, if the battery is still not reaching IBF condition, the onchip timer will terminate the charger to prevent charging the dead battery for excessive long time and the fault condition will be flagged by flashing the RED/GRN LEDs. Charge termination The charge current will gradually decrease in CV mode as the battery approaches full. The battery full threshold can be programmed by connecting a resistor from IBF pin to ground. When the charge current reaches this threshold, the charger IC will be automatically turned off. The battery voltage may decay after termination due to self discharge or system draw current from the battery. Automatic Recharge Upon VBATT drops to 4.0V, the charger will automatically restart the charge cycle until the IBF condition is met again. When the input adapter is unplugged or the charger is disabled and/or terminated, the leakage current from the battery to MP26057 is less than 1µA. Programming of Charge Current and Battery Full Current Table 1: RPGM and ICHG Relationship RPGM (kΩ) 1.65 1.82 2.05 2.32 2.74 3.3 4.12 5.6 8.45 15 Charge Current vs 1/RPGM Resistance IBATT CV Charging IBF Charging Complete Trickle Charging VBATT 2.6V 4.2V Figure 2: MP26057 Typical Charging Profile CHARGE CURRENT (mA) 1000 CC Charging ICHG 10% of ICHG ICHG (mA) 1000 900 800 700 600 500 400 300 200 100 900 800 700 600 500 400 300 200 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Figure 3: Charge Current vs. 1/RPGM Resistance MP26057 Rev. 1.0 12/21/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 8 MP26057- 28V, 1A LINEAR LI-ION TRAVEL CHARGER WITH TRICKLE CHARGE AND TIMER The charge current (ICHG) is set by a resistor (RPGM) connecting from the ISET pin to GND. The relationship of the charge current and the programming resistance is established by the following table and graph. The recommended resistance for programming the charge current is 2.3kΩ