ACT2803 Rev 1, May-12-2016 5V/2.4A Dual Cell Battery Power Manager Battery Over-charge and Over-discharge FEATURES Protections Charge/Discharge Thermal Regulation TQFN5x5-40 Package Dedicated Single-chip Integrated Dual Cell Battery Management Dual Cell Battery Charger with Cell Balancing Management Auto Detection support USB BC1.2, Chinese YD/T 1591-2009, Apple, and Samsung Devices Meet EN55022 Class B Radiated EMI Standard Pass MFi Test 4.5V-5.5V Input Voltage and 2.75A Input Current Limit 2.4A Output Current with CC Regulation 5.07V+/-1% Output with Prioritized Power Path from Input to Output 4.20V/4.35V +/- 0.5% Battery Charge Voltage Accuracy of Each Cell Output Plug-in Detection Wakeup and No Load Detection Sleep Mode Optimized Power Path and Battery Charge Control <10uA Low Battery Drainage Current I2C Port for Optimal System Performance and Status Reporting Configurable Charge, Discharge and HZ modes >92% Charge and Discharge Efficiency at 2.4A Output for Full Battery Range 4 Modes of LED Operation Capability to Charge Wearable Devices Weak Input Sources Accommodation Safety: Input Over-voltage Protection Nearly Zero Power Short Circuit Protection Output Over-voltage Protection APPLICATIONS Backup Battery Pack Power Bank Dual Cell Boost Battery Charger Bluetooth Speaker Standalone Battery Charger with USB Output GENERAL DESCRIPTION ACT2803 is a space-saving and dedicated singlechip solution for dual-cell battery charge and discharge. It takes 5V USB input source to charge a dual cell battery with boost configuration in three phases: preconditioning, constant current, and constant voltage. Charge is terminated when the current reaches 10% of the fast charge rate. The battery charger is thermally regulated at 110˚C with charge current foldback. If input 5V is not present, ACT2803 discharge a dual cell battery with buck configuration to provide 5.07V+/-1% to output ports. There is a power path from input to output. The cycle-by-cycle peak current mode control, constant current regulation, short circuit protection and over voltage protection maximize safe operation. ACT2803 provides 4 LED drive pins for battery capacity level and charge status indication to indicate 25%, 50%, 75%, and 75% above battery level with battery impedance compensation. The LED indication patterns are programmable . ACT2803 is available in a thermally enhanced 5mmx5mm QFN55-40 package with exposed pad. Buck Output CC/CV Buck Output Voltage (V) 6.0 5.0 VBAT = 6.0V 4.0 3.0 VBAT = 8.2V 2.0 1.0 0 0 500 1000 1500 2000 2500 3000 Output Current (mA) Innovative PowerTM -1- www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 ORDERING INFORMATION PART NUMBER BATTERY CELL VOLTAGE JUNCTION TEMPERATURE PACKAGE PINS ACT2803QJ-T 4.20V -40˚C to 150˚C QFN55-40 40 ACT2803QJ-T0435 4.35V -40˚C to 150˚C QFN55-40 40 PIN CONFIGURATION TOP VIEW Innovative PowerTM -2- www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 PIN DESCRIPTIONS PIN NAME 1 CSN Output current sense negative input. 2,3 CSP Output current sense positive input. 4, 5 VOUT 6, 7 VIN 8 OVGATE Output to drive optional external NMOS protect IC from over voltage. 9 OVSENS USB or AC Adapter input sense. 10 SCL I2C clock input. 11 SDA I2C data input. 12 PGND 13 HSB High side bias pin. Connect a 47nF ceramic capacitor from HSB to SW. 14,15 SW Internal switch connected to a terminal of the output inductor. 16,17 BAT BAT connection. Connect it to battery current sense positive terminal. Bypass to PGND with high quality ceramic capacitors placed as close to the IC as possible. 18 BATS Battery charge current sense input. Connect to charge sense resistor positive terminal with Kevin sense. 19 BATP Connect to charge sense resistor negative terminal and battery positive terminal. 20 BATC Battery central point connection. Connect to dual battery cell common terminal. 21 CBD Cell balancing discharge. Connect to a discharge resistor from this pin to battery common terminal. 22 BATN Battery negative terminal. 23 ICST Fast charge current setting pin. Connect a resistor from this pin to AGND to set the charging current. The current setting ranges from 0.5A-1.8A. The voltage at this pin reflects the charge current and discharge current in charge mode and discharge mode, respectively. 24 TH 25 VREG +5V Bias output. Connect a 1.0uF to this pin. This pin supplies up to 50mA output current. The bias turns on in charge mode and discharge mode. Internal register bit can shut down the bias. Bias turns off in HZ mode. 26 AGND Logic ground output. Connect this pin to the exposed PGND pad on same layer with IC. 27 PB 28 LED1 Innovative PowerTM DESCRIPTION Power Output Pin. USB or AC Adapter input. Power ground. Directly connect this pin to IC thermal PAD and connect 22uF high quality capacitors from BAT to PGND on the same layer with IC. Temperature sensing input. Connect to a battery thermistor terminal. Push button input. When this pin is pushed for more than 40ms, LED1-4 indicators are enabled for 5 seconds. Battery level indicator. -3- www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 PIN DESCRIPTIONS PIN NAME 29 LED2 Battery level indicator. 30 LED3 Battery level indicator. 31 LED4 Battery level indicator. 32 LEDLS1 LED1 threshold level shift. Connect a resistor from the pin to AGND to shift LED1 threshold. 33 LEDLS2 LED2 threshold level shift. Connect a resistor from the pin to AGND to shift LED2 threshold. 34 LEDLS3 LED3 threshold level shift. Connect a resistor from the pin to AGND to shift LED3 threshold. 35 LEDLS4 LED4 threshold level shift. Connect a resistor from the pin to AGND to shift LED4 threshold. 36 PT LED indication mode input. The 5 modes of LED indication patterns are set by a voltage at this pin. Connect a resistor at the pin to set the voltage and an LED indication pattern . 37 RIMC RIMC Battery impedance compensation input. Connect a resistor to this pin to offset the LED thresholds in charge mode and discharge mode. 38 HYST The hysteresis window setting input. Connect a resistor at the pin to set the hysteresis windows for LED1, 2, 3, 4. In charge mode, LED thresholds moves up and in discharge mode, LED thresholds moves down. 39 DM Output port auto detection input. Connected to portable device D-. 40 DP Output port auto detection input. Connected to portable device D+. 41 PGND Innovative PowerTM DESCRIPTION Exposed pad. Must be soldered to ground plane layer(s) on the PCB for best electrical and thermal conductivity. -4- www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 ABSOLUTE MAXIMUM RATINGS PARAMETER VALUE UNIT LEDLS1, LEDLS2, LEDLS3, LEDLS4, RIMC, HYST and PT to GND -0.3 to +6 V LED1, LED2, LED3 and LED4 to GND -0.3 to +6 V PB, DM, DP, TH, SCL, SDA and ICST to GND -0.3 to +6 V OVSENS to GND -0.3 to +16 V OVGATE to GND -0.3 to +12 V VIN, VOUT and VREG to GND -0.3 to +6 V CSP to CSN, CSP to VOUT -0.3 to +0.3 V BAT to BATS, BATS to BATP -0.3 to +0.3 V BATC to BATN -0.3 to +6 V BAT to BATC -0.3 to +6 V BATN to GND -0.3 to +0.3 V CBD to BAT -6 to +0.3 V BATN to CBD -6 to +0.3 V SW to PGND -0.3 to +12 V HSB to SW -0.3 to +6 V 40 ℃/W Operating Junction Temperature (TJ) -40 to 150 ℃ Operating Temperature Range (TA) -40 to 85 ℃ Store Temperature -55 to 150 ℃ 300 ℃ Junction to Ambient Thermal Resistance (θJA) Lead Temperature (Soldering, 10 sec) Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability. Innovative PowerTM -5- www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 ELECTRICAL CHARACTERISTICS (VIN = 5V, TA = 25°C, unless otherwise specified.) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Input Current Limit, Over Voltage Protection, Output Under Voltage Protection Input Voltage Range 4.5 6.0 V VIN rising, VIN_OVP Input Over Voltage Hysteresis VIN falling, VIN_OVP_HYST 290 mV Input Under Voltage Lock-Out VIN rising, VIN_UVLO 4.2 V Input Under Voltage Lock-Out Hysteresis VIN falling, VIN_UVLO_HYST 200 mV -10% 5.7 V Input Over Voltage Protection Input Current Limit Setting Range 5.5 5.5 2.75 +10% A Output Under Voltage Protection (UVP) VOUT falling, VOUT_UVP 3.65 V Output Under Voltage Protection Hysteresis VOUT rising, VOUT_UVP_HYST 200 mV 3 s Q1 Wait Time in Hiccup Mode Boost Mode/Charge Mode Switching Frequency -15% 400 +15% KHz Precondition Voltage Threshold of Each Cell VBAT1,2 rising 2.8 V Preconditioning Current Percentage of fast charge current 15 % Boost Charger UVLO VOUT rising, BST_UVLO 4.2 V VBAT_EOC (ACT2803QJ-T) -0.5% 4.2 +0.5% V VBAT_EOC (ACT2803QJ-T0435) -0.5% 4.35 +0.5% V Fast Charge Current Setting Ricst=8kΩ -10% 1.0 +10% A End of Charge Detection Current Percentage of fast charge current 10 % Shielding cable Detection Threshold at PB PB falling In charge mode 3.5 V Start point 4.7 V End point 4.6 V Start point 4.92 V End point 4.82 V 45 min Battery End-Of-Charge Voltage Charge Current Foldback Threshold with VIN, Without Shielding Cable Connected Charge Current Foldback Threshold with VIN, With Shielding Cable Connected Continuous Charging Time after EOC TEOC Charger Thermal Regulation Temperature Innovative PowerTM 100 -6- 110 120 ℃ www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 ELECTRICAL CHARACTERISTICS (VIN = 5V, TA = 25°C, unless otherwise specified.) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Buck mode/Discharge Buck Under Voltage Lock-Out VABT falling, VBAT1,2 2.9 V REG3[1:0]=00,Default 5.07 V REG3[1:0]=01 5.12 V REG3[1:0]=10 5.17 V REG3[1:0]=11 5.22 V VOUT Output Regulation Voltage VOUT Current Limit RCS=25mΩ, ICC 2.45 Buck Converter Under Voltage Protection Threshold VOUT falling goes into hiccup 3.65 V Buck Converter Over Voltage Protection Threshold VOUT rising, BCK_OVP 5.7 V 3.4 s Buck Convert Hiccup Time Buck Converter Light-Load Cut-off Current 5 Buck Converter Light-Load Cut-off Deglitch Time 2.65 10 2.85 15 12.5 A mA s High Side Switch Peak Current Limit All condition 4.5 A Over Temperature Protection OTP 160 ℃ Over Temperature Protection Hysteresis OTP_HYST 20 ℃ 2.6 3 A 101.5 102.5 Battery Protection Battery Over Charge Current Battery Over Voltage Percentage of EOC Voltage Battery Under Voltage and Short Circuit Protection Preconditioning timer 103.5 % 1.6 V 1 hr Charge mode 140 uA Discharge mode 100 uA Charge mode 2.5 V Discharge mode 2.5 V If timer expires, goes to latch-off TH Pull-up Current TH High Threshold Innovative PowerTM -7- www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 ELECTRICAL CHARACTERISTICS (VIN = 5V, TA = 25°C, unless otherwise specified.) PARAMETER TEST CONDITIONS MIN Charge mode TYP MAX UNIT 1 V 0.57 V 50 mA TH Low Threshold Discharge mode System Management VREG Output Current PB Rising Threshold PB Rising, discharge mode 0.95 V PB Falling Threshold PB Falling, discharge mode 0.75 V PB internal pull up resistance Pull up to internal supply 1.2 MΩ Fault Condition Alarm Frequency 0.5s on and 0.5s off 1.0 Hz 10 s Fault Condition Alarm Timer LED Indication LED1-4 Indication Level Setting 5.5 LED Sink Current LED1-4 Scan Interval Innovative PowerTM For each LED pattern before lighting LEDs -8- 8.8 V 3 mA 0.5 s www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 ELECTRICAL CHARACTERISTICS (VIN = 5V, TA = 25°C, unless otherwise specified.) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 0.4 V SCL, SDA Input Low VCC= 5V SCL, SDA Input High VCC= 5V SDA Leakage Current SDA=5V 1 µA SDA Output Low IOL = 5mA 0.35 V 1000 kHz 1.25 0 SCL Clock Frequency, fSCL V SCL Low Period, tLOW 0.5 µs SCL High Period, tHIGH 0.26 µs 50 ns 0 ns SDA Data Setup Time, tSU SDA Data Hold Time, tHD See Note: 1 Start Setup Time, tST For Start Condition 260 ns Stop Setup Time, tSP For Stop Condition 260 ns Capacitance on SCL or SDA Pin 10 pF SDA Fall Time SDA, Tof Device requirement 120 ns Rise Time of both SDA and SCL, tr See Note: 3 120 ns Fall Time of both SDA and SCL, tf See Note: 3 120 ns 50 ns Pulse Width of spikes must be suppressed on SCL and SDA Notes: 1. 2. 3. 4. 0 Comply to I2C timings for 1MHIZ operation - “Fast Mode Plus” No internal timeout for I2C operations This is a I2C system specification only. Rise and Fall time of SCL & SDA not controlled by the device. Device Address is 7’h5A - Read Address is 8’hB4 and write is 8’hB5 tSCL SCL tST tHD tSU tSP SDA Start condition Innovative PowerTM Stop condition -9- www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 I2C DESCRIPTION PROGRAMMABLE PARAMETER LIST ITEMS STEP/STATUS DEFAULT COMMENT 0.6A,1.25A, 2.75A, 3.4A 2.75A +/-10% 4.2V, 4.5V 4.2V +/-3.0% 2.7V, 2.8V, 2.9V, 3.0V 2.9V +/-2% 1.25A/2.65A 2.65A 5.07V, 5.12V, 5.17V, 5.22V 5.07V Input Current Limit and Q1 Input Current Limit VIN UVLO Buck Converter/Discharge Mode Discharge Cut-Off Voltage VOUT Current Limit VOUT Voltage Boost Converter/Charge Mode 4.20V Battery EOC Voltage 4.35V, 4.20V, 4.15V, 4.1V (ACT2803QJ-T) 4.35V (ACT2803QJ-T0435) Pre-charge voltage threshold 2.8V, 3.0V 2.8V Pre-charge Current 10%, 15%, 20%, 25% 15% EOC Current 6%, 10%, 14%, 18% 10% Fast charge current 60%, 80%, 100%, 120% 100% System VCC ON/OFF in HZ Mode Innovative PowerTM ON, OFF - 10 - OFF www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 CUSTOMER REGISTER MAP Address 1 2 3 4 5 6 7 8 Name Master Config System Config Discharge Config Charge Config Charge & System System Status System Fault Battery Fault Type R/W R/W R/W R/W R/W R R R Reset Value 8'h00 8'h00 8'h88 8'h99 8'h92 8'h00 8'h00 8'h00 7 Spare Spare Spare Charge Time after EOC 0: 0s 1: 45mins 6 Spare Spare Spare Battery PreCondition Voltage Level 0: 2.8V 1: 3.0V 01: 80% 11: 120% Battery Fast Charge Current Level 00: 60% 10: 100% DC-DC Operation Mode 5 4 3 2 1 Soft Reset 0 LED Always Display During Discharge 0: Disable 1: Enable Spare LED Breathing PWM Period 0: 2s 1: 3s Spare Spare 01: 10% 11: 18% Battery EOC Current Level Spare 0: No Reset 1: Reset Clear Faults LED Scan Disable 01: 2.8V 11: 3.0V 0: No Clear 1: Clear Faults Mask Faults LED Current 0: Enable 1: Disable 00: 2.7V 10: 2.9V 00: 6% 10: 14% Thermistor Thresholds Spare Spare 0: Single 1: Dual Spare Spare 0: No Fault 1: Fault Battery Low Spare 0: No Fault 1: Fault Battery Trickle/PreCondition Timer Expire 0: No Fault 1: Fault Battery Over Current 0: 120mV 1: 60mV Cell Balance Hysteresis Spare 0: No Fault 1: Fault Battery Short & Pin Fault 0: No Fault 1: Fault 0: Not Connected 1: Connected Flash Light Over-Current USB Device Status Spare Spare Battery Discharge Cut-Off Voltage 0: 3mA 1: 5mA 0: No Mask 1: Mask Disable Battery Cell Balance OverTemperature Discharging Thermal Foldback 0: No Fault 1: Fault Battery Cut-Off 0: No Fault 1: Fault 0: Enable 1: Disable Disable Light Load Spare 0: 0s 1: 30s LED Indication Lock-out 0: Enable 1: Disable Force Standby 0: No Force 1: Force Spare VIN UVLO Level 0: 4.2V 1: 4.5V 0: No Latch-Off 1: Latch-Off HZ Latch-Off 01: 15% 11: 25% Battery Pre-Condition Current Level 00: 10% 10: 20% VREG ON/ OFF in HZ Mode 0: OFF 1: ON Battery Charging Status VOUT UV/ OV 0: No Fault 1: Fault 00: Trickle 01: Pre-Condition 10: Fast Charge 11: Top Off 0: No Fault 1: Fault 0: No Fault 1: Fault Battery OverVoltage 0: No Fault 1: Fault Battery UnderTemperature 00: Disabled 01: Charge 10: Discharge 11: Not Used VIN UV/OV 0: No Fault 1: Fault Battery Over Temperature 0: No Fault 1: Fault www.active-semi.com - 11 - Innovative PowerTM Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 FUNCTIONAL DESCRIPTION ACT2803 is a complete battery charging and discharging power management solution for applications of dull-cell lithium-based backup battery pack or power bank. With the advanced bidirectional architecture, a synchronous boost/buck converter is connected from VOUT to switching node (SW). The converter could be configured as either boost to charge battery or buck to discharge battery. Modes of Operation ACT2803 has 3 operation modes: charge mode, discharge mode, and high-impedance (HZ) mode. High Impedance (HZ) Mode HZ mode is the default mode. In HZ mode, all the switches are turned off , only PB circuit alive and the IC draws less than 10uA current from VBAT. threshold, boost converter charges battery with constant current. In fast charge state, the ACT2803 charges at the current set by the external resistor connected at the ICST pin. During a normal charge cycle fast charge continues in CC mode until VBAT reaches the charge termination voltage, at which point the ACT2803 charges in top off state. Top Off Device transitions from Fast Charge (CC) to Top Off (CV), and moves to EOC (End of Charge) state when charging current is less than IEOC. End of Charge In Top Off mode, when charges current decreases to 10% of set fast charge current, the boost converter goes into end of charge mode and keep monitoring the battery voltage. Recharge Discharge Mode In discharge mode, Buck converter operates in CV/ CC regulation. VOUT current limit is set at 2.65A. Charge Mode ACT2803 is configured in charge mode (boost mode) when VIN is valid. In this mode, a battery is charged with trickle, preconditioning, fast charge, top-off and end of charge (EOC). The typical charge management is shown in Figure 1. Precondition Charge When operating in precondition state, the cell is charged at a reduced current at 15% of the programmed maximum fast charge constant current. Once VBAT reaches the precondition threshold voltage the state machine jumps to the fast charge state. In EOC, device would re-charge batteries when both battery voltage levels drops 5% below VEOC. Battery Removal If the battery is removed, boost converter regulates at the programmed regulation voltage. Cell Balance Cell Balance is activated in both Fast Charge and Top Off modes. Each battery is connected with a parallel bleeding switch. Push Button PB is always watched in HZ mode and discharge mode. If the push but on PB is pressed for >40mS in HZ mode, the LED (s) will turn on for 5 seconds. In the mean time, discharge mode is enabled. Fast Charge If battery voltage is above preconditioning A: PRECONDITION STATE B: FAST-CHARGE STATE C: TOP-OFF STATE D: END-OF-CHARGE STATE Figure 1. Typical Li+ Charge Profile and ACT2803 Charge States Innovative PowerTM - 12 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 APPLICATIONS INFORMATION RLS3 LEDLS1 RLS4 LEDLS2 RLS2 RLS1 LEDLS3 RIMC HYST RHYST LEDLS4 The block diagram in Figure 2 shows how battery current is sensed for charge current control. LEDLS3, LEDLS4 to APNG respectively, as shows in Figure3. RIMC Fast Charge Current Control ACT2803 Figure 2: Battery current monitoring A small percentage of charge current is sensed and sinked into a resistor connected at pin ICST. In charge mode, this would allow user to set fast charge current based on the following equation. Ic ( A) 1000 5 * RCS ( m ) * RICST ( k ) For example, RICST=8kΩ. IC=1A (1) with RCS=25mΩ and Recommended RICST is shown in following table: IC (A) RICST RCS=50mΩ 0.8 10 5 kΩ 0.9 8.89 4.44 kΩ 1.0 8 4 kΩ 1.1 7.27 3.64 The following equation shows how the external resistor shifts the LED thresholds. The range of LED1‐LED4 indicator threshold shift from 5.5V‐ 8.8V. VLEDX (V ) 5.5V 108 k RLSx ( k ) (3) VLED Example is given by the below table: Units RCS=25mΩ Figure 3: LED threshold setting RLSx (kΩ) VLEDx (V) RLSx (kΩ) VLEDx (V) 40 8.2 72 7 43.2 8 90 6.7 6.5 kΩ 47 7.798 108 7.7 120 6.4 1.2 6.67 3.33 kΩ 49.1 1.3 6.15 3.08 kΩ 57 7.395 135 6.3 1.4 5.71 2.86 kΩ 60 7.3 180 6.1 1.5 5.33 2.67 kΩ 67.5 7.1 270 5.9 During discharge mode, inputs of battery current sense amp are flipped to sense discharge current, and voltage level at pin ICST can be used (by the system) to monitor the magnitude of discharge current based on the following equation. V ICST I DISCHARGE R ICST 20 k (2) For example: VICST=0.4V with I_DISCHARGE=1A, and RICST=8kΩ. LED Threshold Setting LED1, LED2, LED3 and LED4 thresholds are adjustable with external resistors RLS1, RLS2, RLS3, and RLS4 connected from LEDLS1, LEDLS2, Innovative PowerTM - 13 - LED Hysteresis Window Setting The adjustable LED voltage thresholds are set for HZ mode. In charge mode, the measured battery voltage is higher than in HZ mode, while in discharge mode, the measured battery voltage is lower. To have relatively better “fuel gauge” for battery, a programmable hysteresis window will help. When the battery voltage goes up (in charge mode), the thresholds become higher, when the battery voltage goes down, lower thresholds are applied. ACT2803 provide HYST pin to set hysteresis window for each indication level as shows in Figure 3. www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 APPLICATIONS INFORMATION current source provides a bias current to generate TH voltage. The ACT2803 compares the voltage at the TH pin with the internal VTHH and VTHL thresholds to determine if charging or discharging is allowed. When VTH<VTHL or VTH >VTHH, it will be triggered latch off fault, there is 3 ways to wake up ACT2803 when VTH returns to the normal range. HYST pin is regulated at 1V. Its input current will determine hysteresis adjustment equally to all level. Connect HYST to APGN via a resistor to set hysteresis window. Beside the hysteresis window, to avoid comparison oscillation, fixed 100mV of hysteresis is added to each LEVEL comparator. 1. Push PB when latch off bit is not set 2. I2C to clear faults in standby 3. Plug Vin to power up Hysteresis window is given by below equation: HYST (V ) 4 54K R HYST K ACT2803 5 VHYST 4 : 3 0.5* HYST VHYST 2 :1 0.6* HYST CHG_HOT + ICHG=140uA VTC L= 1V – RHYST Example is given by the below table: CHG_COLD RHYST (kΩ) LED1 VHYST LED2 VHYST LED3 VHYST LED4 VHYST Floating 0mV 0mV 0mV 0mV 270 120mV 120mV 100mV 100mV 135 240mV 240mV 200mV 200mV VTC H=2.5V – DIS_HOT 90 360mV 360mV 300mV 300mV 480mV 480mV 400mV 400mV 54 600mV 600mV 500mV 500mV 45 720mV 720mV 600mV 600mV 400 600 700 RCS = 25 mΩ 540k 270k 180k 135k 108k 90k 77k RCS = 50 mΩ 1080k 540k 360k 270k 216k 180k 154k (7 ) V TCH I CHG Rcold (8) Battery Temperature Monitering The ACT2803 monitors the battery pack temperature by measuring TH voltage at the TH pin as shows in Figure 4. The TH pin is connected to the thermistor resistor net which includes a negative temperature coefficient thermistor. An internal Innovative PowerTM NTC + VTCL I CHG Rchot ( 6) 500 VTD L=0.57V Figure 4: Thermistor setting RIMC example is given by the below table: 300 Li+ Battery Pack VTD H=2.5V In case not using compensation, float RIMC then there is no compensation affects to trig-points. 200 Rb – To avoid the number of LEDs changes between charge and discharge modes. Internal impedance compensation circuit is built in. An external resistor is used to set the impedance from 100mΩ to 800mΩ. RIMC is corresponding to battery impedance. The LED1-4 thresholds shifted up and down based on the product of charge/discharge current and set impedance. RIMC value is given by below equation. 100 TH Ra DIS_COLD Battery Impedance Compensation RBAT (mΩ) + IDIS=100uA – 67.5 R (m ) RIMC ( k ) 2160 k CS RBAT ( m ) + - 14 - Rchot Rb Ra RNTCh Ra RNTCh (9) Rcold Rb Ra RNTCc Ra RNTCc (10) RNTCc : NTC Resistor at cold temperature (Tcold) RNTCh : NTC Resistor at hot temperature (Thot) From (7) (8) (9) and (10) calculate Ra and Rb in charge mode, as the same method, the resistors in discharge mode can be calculated. For example, use NXRT15XH103 NTC resistor, the temperature in charge mode is 0℃ to 45℃,we know RNTCC=27.219k and 4.917k at 0℃ to 45℃, respectively. We can calculate Ra=33kΩ and Rb=2.87kΩ based on the above formulas. As the same method we can calculate the value when the temperature is -20℃ to 60℃. Cell Balance Setting ACT2803 has integrated a cell balance feature to reduce the un-balance charge between dual batteries. Normally cell balance is activated during Fast Charge and Top Off modes. www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 APPLICATIONS INFORMATION In charge mode, the battery charger provides bias current to balance battery charge. The balance resistor is either connected to upper battery or lower battery depending on which battery voltage is higher. The balance resistor is connected in parallel with one battery that is higher than the other battery. For extremely unbalanced 2S batteries, the charger takes a few cycles to make two battery voltage balanced. For some applications, like removable dual cell batteries, a charger is required to balance dual cells in one charge cycle. In this case, the circuit shown in Figure 5 is recommended. The balance current through the 22 Ohm resistor needs to be higher than EOC current threshold. the LEDs are 0.5Hz with 1s on and 1s off. In HZ mode, when PB is pressed for 40ms, Buck turns on. If VBAT<LED1, LED1 starts flashing until Buck turns off. Conventional indication patterns could behave to have two application. Setting RPT=4kΩ to have “Always On”, setting RPT=12kΩ to have “5s Indication”. The behaviors for both setting are same in charge mode. See below table for more information. # INDICATION PATTERN RPT 1a Conventional Always On In Discharge 4kΩ 1b Conventional 5s Indication in Discharge 12kΩ 2 Breathing 5s Indication in Discharge 24kΩ 3 Bottom Charging 5s Indication in Discharge 40kΩ 4 Circulating 5s Indication in Discharge 56kΩ Below shows 4 LED indication patterns. Figure 5: Cell balance LED Indication ACT2803 is designed 5 levels of PT pin voltage into 5 application patterns. A resistor is connected from PT pin to ground and the voltage at PT pin programs the LED indication patterns shown in Figure 6 . LED1-4 Refreshing Cycle Every time when VIN is plugged in or a PB is pushed, LED1, 2, 3, 4 turns on sequentially at 0.5s interval, like a LED scanning, and then goes into corresponding mode defined by PT pin. LED1-4 Fault Alarm Signal At fault conditions, actions are taken. In the meantime, all the 4 LEDs turn on/off with 0.5s on and 0.5s off for 10 seconds to send alarm signal out. The fault conditions include battery OVP, UVP, OTP. PCB Board Layout Guidance Figure 6: LED Indication In discharge mode, when battery voltage goes below LED1 threshold, LED1 starts flashing until Buck (discharge mode) turns off due to either light load or Buck UVLO. The flash frequencies for all Innovative PowerTM - 15 - When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the IC. 1. Arrange the power components to reduce the AC loop area. www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 APPLICATIONS INFORMATION 2. Place the decoupling ceramic capacitor as close to BAT pin as possible. Use different capacitance combination to get better EMI performance. 3. Place the decoupling ceramic capacitors close to VIN pin, VOUT pin, and BAT pin. 4. Use copper plane for power GND for best heat dissipation and noise immunity. 5. Connect battery with the sequence of BATN>BATP->BATC. 6. Use Kevin sense from sense resistors to CSP and CSN pins, and the sense resistor from BATS and BATP pins. 7. SW pad is a noisy node switching. It should be isolated away from the rest of circuit for good EMI and low noise operation. 8. Thermal pad is connected to GND layer through vias. PGND and AGND should be single-point connected. 9. RC snubber and external Schottky diode across SW to PGND can be added as needed for reducing SW spike and better EMI performance. Innovative PowerTM - 16 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 Figure 7. ACT2803 typical application circuit (Input current limit 2.75A, fast charge current limit 1.0A, discharge output constant current 2.4A) Charge: Cold: 0°C, Hot: 45°C. Discharge: Cold: -20°C, Hot: 60°C. Innovative PowerTM - 17 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 Table 5: BOM List Item Reference Description QTY Manufacturer 1 2 L1 D1 SWPA8040S4R7NT 4.7uH 5.9A(8*8*4mm) MBR1020VL, 20V/1A Schottky, SMA, Optional 1 1 Sunlord Panjit 3 C1 Ceramic capacitor, 10uF/16V, X7R, 1206 1 Murata/TDK 4 C2 Ceramic capacitor, 4.7uF/10V, X7R, 0805 1 Murata/TDK C3,C10,C11,C12 Ceramic capacitor, 22uF/10V, X7R, 1206 4 Murata/TDK Ceramic capacitor, 22uF/16V, X7R, 1206 Ceramic capacitor, 47nF/16V, X7R, 0603 Ceramic capacitor, 0.1uF/16V, X7R, 0603 Ceramic capacitor, 2.2nF/10V, X7R, 0603 Ceramic capacitor, 1uF/10V, X7R, 0603 Ceramic capacitor, 2.2uF/10V, X7R, 0603 Ceramic capacitor, 3.3uF/10V, X7R, 0603 Ceramic capacitor, 100nF/10V, X7R, 0603 Chip Resistor, 2.7Ω, 1/8W, 5%, 0805 Chip Resistor, 25mΩ, 1/2W, 1%, 1206 Chip Resistor, 8kΩ, 1/10W, 1%, 0603 Chip Resistor, 83kΩ, 1/10W, 1%, 0603 3 1 2 1 1 1 1 1 1 2 1 1 Murata/TDK Murata/TDK Murata/TDK Murata/TDK Murata/TDK Murata/TDK Murata/TDK Murata/TDK Murata/TDK SART Murata/TDK Murata/TDK 5 6 7 8 9 10 11 12 13 14 15 16 17 C5,C7,C8 C4 C6,C13 C14 C15 C16 C19 C20 R1 R2,R3 R5 R6 18 R7 Chip Resistor, 63.5kΩ, 1/10W, 1%, 0603 1 Murata/TDK 19 R8 Chip Resistor, 51.4kΩ, 1/10W, 1%, 0603 1 Murata/TDK 20 21 R9 R10,R11 Chip Resistor, 41.5kΩ, 1/10W, 1%, 0603 Chip Resistor, 540kΩ, 1/10W, 1%, 0603 1 2 Murata/TDK Murata/TDK 22 R12 Chip Resistor, 0.47Ω, 1/8W, 1%, 0805 1 Murata/TDK 23 R14,R26 Chip Resistor, 715kΩ, 1/10W, 5%, 0603 2 Murata/TDK 24 R15 Chip Resistor, 12kΩ, 1/10W, 1%, 0603 1 Murata/TDK 25 R17 Chip Resistor, 10Ω, 1/10W, 5%, 0603 1 Murata/TDK 26 R24 Chip Resistor, 47Ω, 1/2W, 1%, 1206 1 Murata/TDK 27 R27 Chip Resistor, 100Ω, 1/10W, 1%, 0603 1 Murata/TDK 28 R30,R31 Chip Resistor, 510Ω, 1/10W, 5%, 0603 2 Murata/TDK 29 R32 Chip Resistor, 3kΩ, 1/10W, 1%, 0603 1 Murata/TDK 30 R33 Chip Resistor, 32kΩ, 1/10W, 1%, 0603 1 Murata/TDK 31 RNTC 103AT NTC Thermistor, NXRT15XH103V 1 Murata LED, 0603, Blue 4 LED Manu Push Button Switch 1 33 LED1,LED2, LED3,LED4 PB 34 Output USB 10.2*14.6*7mm,4P 1 35 Micro-USB MICRO USB 5P/F SMT B 1 36 U1 IC, ACT2803 QFN 5X5-40 1 32 Innovative PowerTM - 18 - ACT www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Schematic as show in Figure 7, Ta = 25°C, unless otherwise specified) Battery Charge V/I Profile Charge Current vs. Output Current Input Current (mA) 2500 2000 Charge Current (mA) VIN = 5.0V ICHRG=1.0A Input Current 1500 Output Current 1000 Charge Current 500 VIN = 5.0V ICHRG = 1.0A 1000 800 600 400 200 0 0 ACT2803-002 1200 ACT2803-001 3000 0 4 8 12 16 20 24 28 0 0.5 1.0 1.5 Test Point 3.0 3.5 4.0 4.5 Discharge Efficiency ACT2803-004 100.0 ACT2803-003 VIN = 5.0V ICHRG = 1.0A 90.0 Efficiency(%) 95.0 Efficiency(%) 2.5 Vbat (V) Charge Efficiency 96.0 2.0 94.0 93.0 92.0 80.0 VBAT = 6.0V VBAT = 7.0V 400 1200 VBAT = 8.4V 70.0 60.0 91.0 50.0 90.0 5.5 6.0 6.5 7.0 7.5 8.0 0 8.5 2400 2800 1000 Battery Leakage (µA) VIN = 5.0V VBAT = 7.0V 800 600 400 200 0 ACT2803-006 25.0 ACT2803-005 1400 Battery Charge Current (mA) 2000 Battery Leakage vs. Junction Temperature (HZ Mode) Battery Charge Current vs. Junction Temperature -20 1600 Output Current (mA) Vbat (V) 1200 800 20.0 15.0 VBAT = 7.0V VBAT = 8.2V 10.0 5.0 0 0 20 40 60 80 100 120 140 -20 Temperature (°C) Innovative PowerTM 0 20 40 60 80 100 120 Temperature (°C) - 19 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Schematic as show in Figure 7, Ta = 25°C, unless otherwise specified) Buck Output Voltage vs. Output Current buck Output Voltage (V) VBAT = 8.4V CV= 4.0V Rcs=25mΩ(1%) 2700 5.25 2650 2600 2550 2500 2450 ACT2803-008 2750 ACT2803-007 Buck Output Constant Current (mA) Buck Output Constant Current Limit vs. Temperature 5.20 5.15 VBAT =8.4V 5.10 5.05 5.00 VBAT=6.0V 4.95 -30 0 30 60 90 120 150 0 500 Temperature (°C) 2000 2500 3000 Buck Output CC/CV 6.0 Buck Output Voltage (V) 2700 2680 2660 2640 2620 2600 5.0 ACT2803-010 2720 ACT2803-009 VBAT = 6.0V 4.0 3.0 VBAT = 8.2V 2.0 1.0 0 5.8 6.2 6.6 7.0 7.4 7.8 8.2 8.6 0 500 1000 1500 2000 2500 Vbat (V) Output1 Current (mA) Buck Standby Current vs. Battery Voltage Battery Leakage vs. Battery Voltage (HZ Mode) 1.1 6.0 1.0 0.9 0.8 0.7 3000 ACT2803-012 7.0 ACT2803-011 1.2 Battery Leakage (µA) Buck Output Constant Current (mA) 1500 Buck Output Current (mA) Buck Output Constant Current Limit vs. VBAT Standby Current (mA) 1000 5.0 4.0 3.0 2.0 1.0 0.6 0 5.8 6.2 6.6 7.0 7.4 7.8 8.2 8.6 0 Battery Voltage (V) Innovative PowerTM 2.0 4.0 6.0 8.0 10.0 12.0 14.0 Battery Voltage(V) - 20 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Schematic as show in Figure 7, Ta = 25°C, unless otherwise specified) Buck Load Transient (Iout:1A-2.4A-1A) Buck Load Transient (Iout: 80mA-1A-80mA, ) VBAT = 8.2V VOUT = 5.0V ACT2803-014 ACT2803-013 VBAT = 8.2V VOUT = 5.0V CH1 CH1 CH2 CH2 CH1: VOUT, 200mV/div CH2: IOUT, 1A/div TIME: 1ms/div CH1: VOUT, 200mV/div CH2: IOUT, 500mA/div TIME: 1ms/div Innovative PowerTM - 21 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 Rev 1, May-12-2016 PACKAGE OUTLINE QFN55-40 PACKAGE OUTLINE AND DIMENSIONS SYMBOL DIMENSION IN MILLIMETERS DIMENSION IN INCHES MIN MAX MIN MAX A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.203 REF 0.008 REF b 0.150 0.250 0.006 0.010 D 4.924 5.076 0.194 0.200 E 4.924 5.076 0.194 0.200 D1 3.300 3.500 0.130 0.138 E1 3.300 3.500 0.130 0.138 e L k 0.400 TYP 0.324 0.476 0.200 MIN 0.016 TYP 0.013 0.019 0.008 MIN Active-Semi, Inc. reserves the right to modify the circuitry or specifications without notice. Users should evaluate each product to make sure that it is suitable for their applications. Active-Semi products are not intended or authorized for use as critical components in life-support devices or systems. Active-Semi, Inc. does not assume any liability arising out of the use of any product or circuit described in this datasheet, nor does it convey any patent license. Active-Semi and its logo are trademarks of Active-Semi, Inc. For more information on this and other products, contact [email protected] or visit http://www.active-semi.com. is a registered trademark of Active-Semi. Innovative PowerTM - 22 - www.active-semi.com Copyright © 2016 Active-Semi, Inc.