Preliminary Datasheet LP28021 1.0A Single-chip Li-ion and Li-POL Charger with OVP Protection General Description Features The LP28021/A is a complete constant-current/ constant Very Low Power Dissipation voltage linear charger for single cell lithium-ion batteries. Its Input Voltage: 3.8V~36V Input OVP: 6.1V Protection of Reverse Connection of Battery to the internal MOSFET architecture. Thermal feedback Programmable Charge Current Up to 1000mA regulates the charge current to limit the die temperature during No MOSFET, Sense Resistor or Blocking Diode Required high power operation or high ambient temperature. The charge Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating automatically terminates the charge cycle when the charge 1µA Leakage Current in Shutdown current drops to 1/10th the RIBAT rammed value after the final Drainage Charge Current Thermal Regulation Status Outputs for LED or System Interface Indicates Charge and Fault Conditions Consumption Available in TDFN-10 Package RoHS Compliant and 100% Lead (Pb)-Free TDFN-10 package and low external component count make the LP28021/A ideally suited for portable applications. No external sense resistor is needed, and no blocking diode is required due voltage is fixed at 4.2V/4.35V, and the charge current can be rammed externally with a single resistor(RIBAT). The LP28021 float voltage is reached. When the input supply is removed, the LP28021/A automatically enters a low current state, dropping the battery drain current to less than 1µA. Other features include charge current monitor, under voltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. Order Information LP28021 □ □□ □ □□ BAT Voltage Default: 4.2V Applications Portable Media Players/Game Power Bank PDA/MID Bluetooth Applications 43: 4.35V F: Pb-Free Package Type QV: TDFN-10 Marking Information Device Marking Package Shipping LP28021 LPS QV:TDFN-10 3K/REEL LP28021 SP:ESOP8 2.5K/REEL QV:TDFN-10 3K/REEL SP: ESOP8 YWX LP28021A Function Class LP28021A Default：OCP Adjustable A：Enable LPS YWX Marking indication: Y:Production year W:Production week LP28021-04 Apr.-2017 Email: [email protected] X: Series Number www.lowpowersemi.com Page 1 of 11 Preliminary Datasheet LP28021 Typical Application Circuit LP28021 VIN VIN VO CIN 1uF Battery OV VBAT 2K CHRG CBAT 10uF LED1 STDBY LED2 ISET ILIMIT RLIMIT RIBAT GND LP28021A VIN VIN VO CIN 1uF OV OFF CHRG EN ON 2K LED1 STDBY Battery LED2 ISET VBAT CBAT 10uF RIBAT GND Functional Pin Description Package Type Pin Configurations ESOP8 / TDFN-10 (LP28021) ILIMIT 1 BAT 2 STDBY 3 CHRG 4 GND 9 8 VIN 7 VO GND 1 ILIMIT 2 BAT 3 6 GND 5 ISET 8 VO 7 GND CHRG 5 6 ISET TDFN-10 GND 1 10 VIN EN 2 BAT 3 (LP28021A) 9 OV 11 GND STDBY 4 ESOP8 TDFN-10 10 VIN 9 OV 11 GND 8 VO STDBY 4 7 GND CHRG 5 6 ISET TDFN-10 LP28021-04 Apr.-2017 Email: [email protected] www.lowpowersemi.com Page 2 of 11 Preliminary Datasheet LP28021 Pin Description Pin LP28021 LP28021A Name Description GND is the connection to system ground. ESOP8 TDFN-10 TDFN-10 6,9 1,7,11 1,7,11 GND 2 ILIMIT 1 2 2 3 3 Input Current limit Program Pin. The input current from VIN to OV is programmed by connecting a 1% resistor(RLIMIT)to ground. /EN Chip enable pin. Active low BAT BAT is the connection to the battery. Open-Drain Charge Status Output. When the battery is charging, this 3 4 4 STDBY STDBY pin is pulled High by an internal N-channel MOSFET. When the charge cycle is completed, the pin is pulled Low. Open-Drain Charge Status Output. When the battery is charging, this 4 5 5 CHRG CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, the pin is pulled High. 5 6 6 ISET 7 8 8 VO 9 9 OV 10 10 VIN 8 LP28021-04 Apr.-2017 Charge Current Program, Charge Current Monitor and Shutdown Pin. Input of Charger. Connect a capacitor 10uF to ground. Output of Over Voltage Protection part. Connect a capacitor 10uF to ground. VIN is the input power source with Over Voltage Protection part. Connect to a wall adapter. Email: [email protected] www.lowpowersemi.com Page 3 of 11 Preliminary Datasheet LP28021 Function Diagram OV VIN Charge pump OCP ILIMIT Control Logic EN Vref VO OTP 1X 1200X 145℃ TDIE NC TA - + MA BAT 5μA TTEMP R1 CA - + TTEMP VA 45%VIN C1 SHDN + - + R3 CHRG REF 1.22V 1V R2 R4 C2 STDBY C3 + - + 0.1V - R5 TO BAT 2.9V VCC 3μA ISET LP28021-04 Apr.-2017 Email: [email protected] GND www.lowpowersemi.com Page 4 of 11 Preliminary Datasheet LP28021 Absolute Maximum Ratings Note 1 Input Voltage to GND(VIN) ----------------------------------------------------------------------------------- -0.3V to 36V VO, VOV Voltage to GND(VO,OV) ------------------------------------------------------------------------- -0.3V to 7V BAT to GND ------------------------------------------------------------------------------------------------------- -5V to 8V VO to BAT ------------------------------------------------------------------------------------------------------------------- 8V BAT Short-Circuit Duration ----------------------------------------------------------------------------------- Continuous BAT Pin Current ---------------------------------------------------------------------------------------------------- 1000mA Other pin to GND ----------------------------------------------------------------------------------------------- -0.3V to 6V Maximum Junction Temperature ---------------------------------------------------------------------------------- 150℃ Operating Ambient Temperature Range(TA) -------------------------------------------------------- -40℃ to 85℃ Storage Temperature Maximum Soldering Temperature (at leads, 10 sec) -------------------------------------------------------- 260℃ Note 1. --------------------------------------------------------------------------------------- -45℃ to 165℃ Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Thermal Information Maximum Power Dissipation (PD, TA=25℃, TDFN-10) ------------------------------------------------------- 1.5W Maximum Power Dissipation (PD, TA=25℃, ESOP8) ----------------------------------------------------------- 2W Thermal Resistance (JA,TDFN-10) ----------------------------------------------------------------------------- 65℃/W Thermal Resistance (JA,ESOP8) -------------------------------------------------------------------------------- 50℃/W ESD Susceptibility HBM(Human Body Mode) --------------------------------------------------------------------------------------------- 2KV MM(Machine Mode) --------------------------------------------------------------------------------------------------- 200V LP28021-04 Apr.-2017 Email: [email protected] www.lowpowersemi.com Page 5 of 11 Preliminary Datasheet LP28021 Electrical Characteristics (TA=25℃. VIN=5V, unless otherwise noted.) Symbol VIN VOVP VHYS-OVP TOVP TON(OVP) Parameter Input Voltage OVP threshold OVP hysteresis OVP active time OVP recovery time ILIMIT Input current limit set (LP28021) TOCP VILIMIT TON(OCP) VEN(ON) VEN(OFF) Over current Protection detection time ILIMIT Voltage Over current Protection recovery time Chip enable Chip shutdown IQ Input Supply Current VFLOAT Regulated Output (Float) Voltage IBAT BAT Pin Current ITRIKL VTRIKL VTRHYS VUV VUVHYS Trickle Charge Current Trickle Charge Threshold Voltage Trickle Charge Hysteresis Voltage VIN Under voltage Lockout Threshold VIN Under voltage Lockout Hysteresis VASD VVO–VBAT Lockout Threshold Voltage ITERM C/10 Termination Current Threshold VISET I(CHRG/STDBY) V(CHRG/STDBY) ΔVRECHRG IBAT Pin Voltage CHRG/STDBY Pin Weak Pull-Down Current CHRG/STDBY Pin Output Low Voltage Recharge Battery Threshold Voltage Junction Temperature in Constant Temperature Mode OTP hysteresis Power FET “ON” Resistance (Between VO and BAT) TLIM ΔTLIM RON LP28021-04 Apr.-2017 Condition VIN increasing from 5~7V VIN decreasing from 7~5V VIN=5->10V VIN=10->5V to output ON RLIMIT=51K RLIMIT=82K RLIMIT=150K RLIMIT=NC (LP28021A) Charge Mode, RIBAT=10k Standby Mode (Charge Terminated) IBAT=40mA（LP28021XXX） IBAT=40mA（LP28021XXX-43） RIBAT=1k, Current Mode RIBAT=2k, Current Mode Standby Mode, VBAT=4.2V Shutdown Mode (RIBAT NC) Reverse Current, VBAT=-4.2V VBAT<2.8V RIBAT=10k, VBAT Rising RIBAT=10k VVO from Low to High VVO from Low to High VVO from High to Low RIBAT = 10k RIBAT = 2k RIBAT=10k, Current Mode V(CHRG/STDBY)= 5V I(CHRG/STDBY)=5mA VFLOAT-VRECHRG Email: [email protected] Min 3.8 5.8 Typ 5 6.1 150 Max 36 6.4 300 2000 Units V V mV μs ms A A A A ms V s V V μA 200 500 μA 4.2 4.35 1000 500 -2.5 ±1 -1 30 2.9 120 3.8 500 100 80 10 10 1 4.242 4.4 V V mA mA μA μA mA mA V mV V mV mV mV %IBAT %IBAT V μA V mV 1 2.1 9 1.9 1.3 0.85 2.5 30 0.8 1 0.4 1.4 4.158 4.3 2.8 100 0.35 150 -6 ±2 3.0 5 0.6 200 150 ℃ 20 ℃ 300 mΩ www.lowpowersemi.com Page 6 of 11 Preliminary Datasheet LP28021 Typical Operating Characteristics of OVP Turn on waveform VIN falling waveform LP28021-04 Apr.-2017 Email: [email protected] OVP waveform OCP detection time www.lowpowersemi.com Page 7 of 11 Preliminary Datasheet LP28021 Application Information The LP28021 is a single cell lithium-ion battery Charge Termination charger using a constant-current/constant-voltage A charge cycle is terminated when the charge current falls to algorithm. It can deliver up to 1000mA of charge 1/10th the ISET rammed value after the final float voltage is current (using a good thermal PCB layout) with a reached. This condition is detected by using an internal, final float voltage accuracy of ±1%. The LP28021 filtered comparator to monitor the ISET pin. When the ISET includes an internal P-channel power MOSFET and pin voltage falls below 200mV for longer than tTERM(typically thermal regulation circuitry. No blocking diode or external current sense resistor is required; thus, the 1ms), charging is terminated. The charge current is latched off and the LP28056S enters standby mode, where the input supply current drops to 200µA. In this state, all loads on the basic charger circuit requires only two external BAT pin must be supplied by the battery. (Note: C/10 components. Furthermore, the LP28021 is capable termination is disabled in trickle charging and thermal limiting of operating from a USB power source. modes). Normal Charge Cycle A charge cycle begins when the voltage at the VO ISET ramming Charge Current pin rises above the UVLO threshold level and a 1% The charge current is IIBAT rammed using a single resistor is connected from the ISET pin to ground or resistor from the ISET pin to ground. The battery when a battery is connected to the charger output. If charge current is 1000 times the current out of the the BAT pin is less than 2.8V, the charger enters IIBAT pin. The IIBAT ram resistor and the charge current trickle charge mode. In this mode, the LP28021 are calculated using the following equations: supplies 30mA charge current to bring the battery voltage up to a safe level for full current charging. When the BAT pin voltage rises above 2.9V, the charger enters constant-current mode, where the RISET rammed charge current is supplied to the RISET=1000V/IBAT The charge current out of the BAT pin can be determined at any time by monitoring the IBAT pin voltage using the following equation: IBAT=VISET×1000/RISET battery. When the BAT pin approaches the final float voltage, the LP28021 enters constant-voltage mode IBAT= 1000V/RISET Note: VIBAT is 1Volts. and the charge current begins to decrease. The charge cycle ends when the charge current drops to 1/10 of the RISET rammed value. LP28021-04 Apr.-2017 Email: [email protected] www.lowpowersemi.com Page 8 of 11 Preliminary Datasheet LP28021 Charge Status Indicator Thermal Limiting The charge status output has two different states: An internal thermal feedback loop reduces the IBAT strong pull-down (~5mA) and high impedance. The rammed charge current if the die temperature strong pull-down state indicates that the LP28021 is attempts of in a charge cycle. Once the charge cycle has approximately 150℃. This feature protects the terminated, the pin state is determined by under LP28021 from excessive temperature and allows the voltage lockout conditions. High impedance indicates user to push the limits of the power handling that the LP28021 is in under voltage lockout mode: capability of a given circuit board without risk of either VO is less than 100mV above the BAT pin damaging the LP28021. The charge current can be voltage or insufficient voltage is applied to the VO pin. set according to typical (not worst-case) ambient A microprocessor can be used to distinguish temperature with the assurance that the charger will between these two states—this method is discussed automatically reduce the current in worst-case in the Applications Information section. When VIN conditions. are rise above 6.1V(typ.), the CHRG and STDBY LEDs discussed further in the Applications Information would be turned off. A microprocessor can be used section. to distinguish between these two states. LP28021-04 to rise TDFN above power Apr.-2017 a preset value considerations Function CHRG STDBY Charging low high Charge Complete high low Email: [email protected] www.lowpowersemi.com Page 9 of 11 Preliminary Datasheet LP28021 Packaging Information TDFN-10 LP28021-04 Apr.-2017 Email: [email protected] www.lowpowersemi.com Page 10 of 11 Preliminary Datasheet LP28021 ESOP8 LP28021-04 Apr.-2017 Email: [email protected] www.lowpowersemi.com Page 11 of 11