ACT2804 Rev 2, Feb-04-2016 5V/3.4A Dual Cell Backup Battery Power Manager Battery Over-charge and Over-discharge FEATURES Dedicated Single-chip Integrated Battery Power Manager Dual Cell Battery Charger with Cell Balancing Protections Charge/Discharge Thermal Regulation TQFN5x5-40 Package APPLICATIONS Management Auto Detection support USB BC1.2, Chinese YD/T 1591-2009, Apple 2.4A, and Samsung Devices Passed Apple MFi Test 4.5V-5.5V Input Voltage with 3.4A Input Current Limit 2.4A+1.0A Dual Outputs with CC Regulation 5.07V+/-1% Output with Prioritized Power Path from Input to Output 4.2V/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 3.4A Output for Full Battery Range 4 Modes of LED Operation Preconditioning for Deeply Depleted Battery Weak Input Sources Accommodation Safety: Input Over-voltage Protection Nearly Zero Power Short Circuit Protection Output Over-voltage Protection Backup Battery Pack Power Bank Mobile Power Standalone Battery Charger with USB Output GENERAL DESCRIPTION ACT2804 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, ACT2804 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. ACT2804 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 . ACT2804 is available in a thermally enhanced 5mmx5mm QFN55-40 package with exposed pad. Buck Output CC/CV 1uF 6.0 22uF VOUT2 5.07V/2.4A VOUT1 5.07V/1A LED4 LED3 LED2 LED1 VREG BAT VIN 22uF 25mΩ CSN2 BATS CSP BATP CSN1 25mΩ 4.7uH ACT2804 22uF 22uF PGND HSB 510Ω CBD 47Ω BATN RIMC ICS T 540k 25mΩ BATC VOUT SW 47nF 22uF Buck Output Voltage (V) VIN 4.5V-5.5V 8k TH PB AGND 510Ω 10k 5.0 VBAT = 6.0V 4.0 3.0 1A Output 2.4A Output 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. ACT2804 Rev 2, Feb-04-2016 ORDERING INFORMATION PART NUMBER BATTERY CELL VOLTAGE JUNCTION TEMPERATURE PACKAGE PINS ACT2804QJ-T 4.20V -40˚C to 150˚C QFN55-40 40 ACT2804QJ-T0435 4.35V -40˚C to 150˚C QFN55-40 40 LED4 LEDLS1 LEDLS2 LEDLS3 LEDLS4 PT RIMC HYST DM DP PIN CONFIGURATION CSN2 LED3 CSN1 LED2 CSP LED1 VOUT PB VOUT AGND ACT2804 VIN VREG TH VIN OVGATE ICST PGND OVSENS BATN BATC BATP BATS BAT BAT SW SW HSB PGND CBD SDA SCL TOP VIEW Innovative PowerTM -2- www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 PIN DESCRIPTIONS PIN NAME 1 CSN2 Output current sense negative input for channel 2. 2 CSN1 Output current sense negative input for channel 1. 3 CSP 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 BAT pin to PGND pin with high quality ceramic capacitors on the same layer with IC. 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 Innovative PowerTM DESCRIPTION Output current sense positive input. Power Output Pin. USB or AC Adapter input. Power ground. Directly connect this pin to IC thermal PAD and connect 10uF or 22uF high quality capacitors from BAT to PGND on the same layer with IC. Temperature sensing input. Connect to a battery thermistor terminal. +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. -3- www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 PIN DESCRIPTIONS PIN NAME 26 AGND 27 PB 28 LED1 Battery level indicator. 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 37 RIMC RIMC Battery impedance compensation input. 38 HYST The hysteresis window setting input. Connect a resistor at the pin to set the hysteresis windows for LED1, 2, 3, 4. 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 Logic ground output. Connect this pin to the exposed PGND pad on same layer with IC. Push button input. When this pin is pushed for more than 40ms, LED1-4 indicators are enabled for 5 seconds. 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. 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. ACT2804 Rev 2, Feb-04-2016 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 CSN2, CSP to CSN1, 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. ACT2804 Rev 2, Feb-04-2016 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 5.9 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 3.4 +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 (ACT2804QJ-T) -0.5% 4.2 +0.5% V VBAT_EOC (ACT2804QJ-T0435) -0.5% 4.35 +0.5% V Battery End-Of-Charge Voltage End of Charge Detection Current Percentage of fast charge current 10 % VABT falling, VBAT1, 2 2.9 V REG3[1:0]=00 5.07 V REG3[1:0]=01 5.12 V REG3[1:0]=10 5.17 V REG3[1:0]=11 5.22 V Buck mode/Discharge Buck Under Voltage Lock-Out VOUT Output Regulation Voltage RCS1=25mΩ, ICC1 1.05 1.25 1.40 A RCS2=25mΩ, ICC2 2.45 2.65 2.85 A VOUT1 and VOUT2 Current Limit Innovative PowerTM -6- www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 ELECTRICAL CHARACTERISTICS (VIN = 5V, TA = 25°C, unless otherwise specified.) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 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 10 15 12.5 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 1 V 0.57 V 50 mA If timer expires, goes to latch-off TH Pull-up Current TH High Threshold Charge mode 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 Innovative PowerTM -7- www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 ELECTRICAL CHARACTERISTICS (VIN = 5V, TA = 25°C, unless otherwise specified.) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 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. ACT2804 Rev 2, Feb-04-2016 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 SCL Clock Frequency, fSCL 0 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. ACT2804 Rev 2, Feb-04-2016 FUNCTIONAL DESCRIPTION ACT2804 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. 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 ACT2804 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 In EOC, device would re-charge batteries when both battery voltage levels drops 5% below VEOC. Modes of Operation ACT2804 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. Discharge Mode In discharge mode, Buck converter operates in CV/ CC regulation. VOUT1 current limit is set at 1.25A and VOUT2 current limit is set at 2.65A. Charge Mode ACT2804 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. Fast Charge If battery voltage is above preconditioning threshold, boost converter charges battery with constant current. In fast charge state, the ACT2804 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. VEOC RECHARGE FAST CHARGEB CURRENT Current A: PRECONDITION STATE B: FAST-CHARGE STATE C: TOP-OFF STATE D: END-OF-CHARGE STATE Voltage VPRECHARGE END-OF-CHARGE CURRENT PRECONDITION CHARGE CURRENT STATE A B C D B Figure 1. Typical Li+ Charge Profile and ACT2804 Charge States Innovative PowerTM - 10 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 APPLICATIONS INFORMATION LEDLS3, LEDLS4 to APNG respectively, as shows in Figure3. Fast Charge Current Control The block diagram in Figure 2 shows how battery current is sensed for charge current control. Io Iin VIN Output VOUT Cin RHY ST RIMC RLS2 RLS1 RLS3 RLS4 Cout1 L ACT2804 SW Battery2 LEDLS1 LEDLS2 Battery1 RCBD 47 LEDLS3 CBD LEDLS4 BAT RIM C RCS 25m ICST RICST HYS T Input ACT2804 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) (1) For example, IC=1A with RCS=25mΩ and RICST=8kΩ. Recommended RICST is shown in following table: IC (A) RICST Units RCS=25mΩ RCS=50mΩ 0.8 10 5 kΩ 0.9 8.89 4.44 kΩ Figure 3: LED threshold setting 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 108k R LSx ( k) (3) RLSx (kΩ) VLEDx (V) RLSx (kΩ) VLEDx (V) 40 8.2 72 7 43.2 8 90 6.7 1.0 8 4 kΩ 47 7.798 108 6.5 1.1 7.27 3.64 kΩ 49.1 7.7 120 6.4 1.2 6.67 3.33 kΩ 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. VICST I DISCHARGE RICST 20k VLED Example is given by the below table: LED Hysteresis Window Setting (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 - 11 - 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. ACT2804 provide HYST pin to set hysteresis window for each indication level as shows in Figure www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 APPLICATIONS INFORMATION 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. Hysteresis window is given by below equation: HYST (V ) 54K RHYST K VHYST 4 : 3 0.5 * HYST TH voltage. The ACT2804 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 ACT2804 when VTH returns to the normal range. 1. Push PB when latch off bit is not set 2. I2C to clear faults in standby 3. Plug Vin to power up 4 ACT2804 CHG_HOT 5 VHYST 2 : 1 0.6 * HYST LED2 VHYST LED3 VHYST LED4 VHYST Floating 0mV 0mV 0mV 0mV 270 120mV 120mV 100mV 100mV 135 240mV 240mV 200mV 200mV DIS_HOT 90 360mV 360mV 300mV 300mV 480mV 480mV 400mV 400mV 54 600mV 600mV 500mV 500mV 45 720mV 720mV 600mV 600mV 100 200 300 400 600 V TCH I CHG Rcold (8) 700 540k 270k 180k 135k 108k 90k 77k 1280k 540k 360k 270k 216k 180k 154k BATTERY TEMPERATURE MONITERING 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℃. LED Indication The ACT2804 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 current source provides a bias current to generate Innovative PowerTM NTC VTDH=2.5V (7 ) (6) 500 Li+ Battery Pack VTCL I CHG Rchot RIMC example is given by the below table: RBAT (mΩ) Rb Figure 4: Thermistor setting In case not using compensation, float RIMC then there is no compensation affects to trig-points. RCS = 25 mΩ RCS = 50 mΩ TH + – 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. RCS (m) RBAT (m) IDIS=100uA VTDL=0.57V Ra Battery Impedance Compensation RIMC (k) 2160k + VTCH=2.5V – DIS_COLD 67.5 + – Then RHYST Example is given by the below table: LED1 VHYST ICHG=140uA VTCL=1V – CHG_COLD RHYST (kΩ) + ACT2804 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. - 12 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 APPLICATIONS INFORMATION 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. LED4 LED3 LED2 LED1 VREG BAT BATS BATP BATC CBD LED1-4 Fault Alarm Signal ACT2804 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. PB GND BATN LEDS4 LEDS3 LEDS2 LEDS1 PT RS4 RS3 RS2 RS1 PCB Board Layout Guidance RPT Figure 5: 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 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 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. 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. Use Kevin sense from sense resistors to CSP and CSN1, CSN2 pins, and the sense resistor from BATS and BATP pins. 6. SW pad is a noisy node switching. It should be isolated away from the rest of circuit for good EMI and low noise operation. 7. Thermal pad is connected to GND layer through vias. PGND and AGND should be single-point connected. 8. RC snubber and external Schottky diode across SW to PGND can be added as needed for reducing SW spike and better EMI performance. Below shows 4 LED indication patterns. Conventional Bottom Charging Circulating Breathing <25% 25% SOC<50% 50% SOC<75% 75% SOC<100% EOC Flash Circulating on Breathing on/off Off Innovative PowerTM Always on - 13 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 APPLICATIONS SCHEMATIC R23 R22 R12 R11 R10 R9 R8 R7 R6 C15 R2A Output USB 1 + DD+ - R2 R21 C17 Q1 LED4 LEDLS1 LED2 CSP LED1 VOUT PB VOUT GND ACT2804 C13 R17 R5 BATN R18 BATC BATP BATS BAT BAT SW SW HSB PGND MCU S1 R NTC CBD SDA R20 Optiona l LED1 ICS T PGND SCL R1 LED2 TH OVS ENS + DD+ - LED3 VREG VIN OVG ATE Input USB LED4 LED3 CSN1 VIN C2 LEDLS2 PT CSN2 LEDLS3 R3A LEDLS4 C16 RIMC DP + DD+ - HYST Output USB 2 DM R3 R15 C14 C1 C7 R16 R14 R4 C8 R19 BAT1 R4A L1 BAT2 D1 C3 C4 C5 C6 R13 C9 C10 C11 Optiona l C12 Figure 6. ACT2804 typical application circuit (Input current limit 3.4A, fast charge current limit 1.0A, discharge output constant current 2.4A+1A) Charge: Cold: 0°C, Hot: 45°C. Discharge: Cold: -20°C, Hot: 60°C. Innovative PowerTM - 14 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 Table 5: BOM List ITEM REFERENCE 1 C1 2 DESCRIPTION QTY MANUFACTURER Ceramic capacitor, 4.7uF/10V, X7R, 0805 1 Murata/TDK C2,C3,C4,C5,C8, C9,C11 Ceramic capacitor, 22uF/16V, X7R, 1206 7 Murata/TDK 3 C6,C10 Ceramic capacitor, 0.1uF/16V, X7R, 0603 2 Murata/TDK 4 C7 Ceramic capacitor, 47nF/10V, X7R, 0603 1 Murata/TDK 5 C12 Ceramic capacitor, 2.2nF/16V, X7R, 0603 1 Murata/TDK 6 C13 Ceramic capacitor, 1uF/10V, X7R, 0603 1 Murata/TDK 7 C14 Ceramic capacitor, 100nF/16V, X7R, 0603 1 Murata/TDK C15 Ceramic capacitor, 2.2uF/10V, X7R, 0603 1 Murata/TDK 9 C16,C17 Ceramic capacitor, 3.3uF/10V, X7R, 0603 2 Murata/TDK 10 D1 MBR1020VL, 20V, 1A Schottky, optional 1 Panjit 11 L1 Core SWPA8040S4R7NT 4.7uH 5.9A 1 Sunlord 4 LED Manu 12 LED1,LED2, LED3,LED4 LED, 0603, Blue 13 R1 Chip Resistor, 2.7Ω, 1/8W, 1%, 0805 1 Murata/TDK 14 R2,R2A,R3,R3A,R4,R4A Chip Resistor, 50mΩ, 1/2W, 1%, 1206 6 SART 15 R5 Chip Resistor, 8kΩ, 1/10W, 1%, 0603 1 Murata/TDK 16 R6 Chip Resistor, 83kΩ, 1/10W, 1%, 0603 1 Murata/TDK 17 R7 Chip Resistor, 63.5kΩ, 1/10W, 1%, 0603 1 Murata/TDK 18 R8 Chip Resistor, 51.4kΩ, 1/10W, 1%, 0603 1 Murata/TDK 19 R9 Chip Resistor, 41.5kΩ, 1/10W, 1%, 0603 1 Murata/TDK 20 R10 Chip Resistor, 12kΩ, 1/10W, 5%, 0603 1 Murata/TDK 21 R11,R12 Chip Resistor, 540kΩ, 1/10W, 1%, 0603 2 Murata/TDK 22 R13 Chip Resistor, 0.47Ω, 1/8W, 5%, 0805 1 Murata/TDK 23 R14,R16 Chip Resistor, 510Ω, 1/10W, 1%, 0603 2 Murata/TDK 24 R15 Chip Resistor, 47Ω, 1/4W, 5%, 1206 1 Murata/TDK 25 R17 Chip Resistor, 3k, 1/10W, 1%, 0603 1 Murata/TDK 26 R18 Chip Resistor, 32k, 1/10W, 1%, 0603 1 Murata/TDK 27 R19 Chip Resistor, 10Ω, 1/10W, 1%, 0603 1 Murata/TDK 28 R20 Chip Resistor, 200Ω, 1/10W, 5%, 0603, optional 1 Murata/TDK 29 R21 Chip Resistor, 100Ω, 1/10W, 5%, 0603 1 Murata/TDK 30 R22, R23 Chip Resistor, 715kΩ, 1/10W, 5%, 0603 2 Murata/TDK 31 RNTC 103AT NTC Thermistor, NXRT15XH103V 1 Murata 32 Q1 8205A, Rdson < 25mΩ at VGS = 4.5 V, optional 1 TY 33 PB Push Button Switch 1 Nikkai Omron 34 USB 10.2*14.6*7mm, 4P 2 35 Micro-USB MICRO USB 5P/F SMTB 1 36 U1 IC, ACT2804, QFN 55-40 1 Innovative PowerTM - 15 - Active-Semi www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Schematic as show in Figure 6, Ta = 25°C, unless otherwise specified) Battery Charge V/I Profile Charge Current vs. Output Current Input Current (mA) 2500 Charge Current (mA) VIN = 5.0V 3000 Input Current 2000 Output Current 1500 Charge Current 1000 ACT2804-002 1200 ACT2804-001 3500 VIN = 5.0V ICHRG = 1.0A 1000 800 600 400 200 500 0 0 0 5 10 15 20 25 30 0 0.5 1.0 1.5 2.0 Test Point 4.5 VIN = 5.0V ICHRG = 1A 3500 4000 ACT2804-004 ACT2804-003 VBAT = 6.0V 95.0 Efficiency(%) Efficiency(%) 4.0 100.0 94.0 93.0 92.0 VBAT = 7.5V 90.0 VBAT = 8.4V 85.0 80.0 91.0 90.0 75.0 5.5 6.0 6.5 7.0 7.5 8.0 0 8.5 500 1000 1500 2000 2500 3000 Output Current (mA) Vbat (V) Battery Leakage vs. Junction Temperature (HZ Mode) Battery Charge Current vs. Junction Temperature 1200 1000 Battery Leakage (µA) VIN = 5.0V VBAT = 7.5V 800 600 400 ACT2804-006 25.0 ACT2804-005 Battery Charge Current (mA) 3.5 Discharge Efficiency 95.0 1400 3.0 Vbat (V) Charge Efficiency 96.0 2.5 20.0 15.0 VBAT = 7.0V VBAT = 8.2V 10.0 5.0 200 0 0 -20 0 20 40 60 80 100 120 140 -20 Temperature (°C) Innovative PowerTM 0 20 40 60 80 100 120 Temperature (°C) - 16 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 TYPICAL PERFORMANCE CHARACTERISTICS CONT’D Buck Output1 Constant Current Limit vs. Temperature 1250 Buck Output2 Constant Current (mA) VBAT = 8.4V CV= 4.0V Rcs=25mΩ(1%) 1200 1150 1100 1050 1000 -30 0 30 60 90 120 2750 VBAT = 8.4V CV= 4.0V Rcs=25mΩ(1%) 2700 2650 2600 2550 2500 2450 150 -30 0 30 Temperature (°C) Buck Output1 Voltage vs. Output Current 150 buck Output2 Voltage (V) 5.15 VBAT =8.4V 5.05 VBAT=6.0V ACT2804-0010 Buck Output1 Voltage (V) 120 Buck Output2 Voltage vs. Output Current 4.95 5.20 5.15 VBAT =8.4V 5.10 5.05 5.00 VBAT=6.0V 4.95 0 200 400 600 800 1000 1200 1400 0 500 Buck Output1 Current (mA) Buck Output2 Constant Current (mA) 1210 1200 1190 1180 6.6 7.0 7.4 7.8 8.2 8.6 2500 3000 2720 2700 2680 2660 2640 2620 2600 5.8 Vbat (V) Innovative PowerTM 2000 ACT2804-012 1230 6.2 1500 Buck Output2 Constant Current Limit vs. VBAT ACT2804-011 1240 5.8 1000 Buck Output2 Current (mA) Buck Output1 Constant Current Limit vs. VBAT Buck Output1 Constant Current (mA) 90 5.25 ACT2804-009 5.20 5.00 60 Temperature (°C) 5.25 5.10 ACT2804-008 1300 Buck Output2 Constant Current Limit vs. Temperature ACT2804-007 Buck Output1 Constant Current (mA) (Schematic as show in Figure 6, Ta = 25°C, unless otherwise specified) 6.2 6.6 7.0 7.4 7.8 8.2 8.6 Vbat (V) - 17 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Schematic as show in Figure 6, Ta = 25°C, unless otherwise specified) Battery Leakage vs. Battery Voltage (HZ Mode) Buck Standby Current vs. Battery Voltage 6.0 Battery Leakage (µA) Standby Current (mA) 1.1 ACT2804-014 7.0 ACT2804-013 1.2 1.0 0.9 0.8 0.7 5.0 4.0 3.0 2.0 1.0 0 0.6 5.8 6.2 6.6 7.0 7.4 7.8 8.2 8.6 2.0 0 Battery Voltage (V) Buck Output1 CC/CV 8.0 10.0 12.0 14.0 Buck Output2 CC/CV Buck Output2 Voltage (V) VBAT = 6.0V 4.0 VBAT = 8.2V 2.0 1.0 5.0 ACT2804-016 5.0 6.0 ACT2804-015 Buck Output1 Voltage (V) 6.0 Battery Voltage(V) 6.0 3.0 4.0 VBAT = 6.0V 4.0 3.0 VBAT = 8.2V 2.0 1.0 0 0 0 200 400 600 800 1000 1200 0 500 Output1 Current (mA) 1500 2000 2500 3000 Output2 Current (mA) Buck Load Transient (Iout2:1A-2.4A-1A, Iout1: 0A) Buck Load Transient (Iout2: 80mA-1A-80mA, Iout1: 0A) ACT2804-018 ACT2804-017 VBAT = 8.2V VOUT = 5.0V 1000 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 - 18 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Schematic as show in Figure 6, Ta = 25°C, unless otherwise specified) Buck Load Transient (Iout2:1A-2.4A-1A, Iout1: 1A) Buck Load Transient (Iout2: 80mA-1A-80mA, Iout1: 1A) VBAT = 8.2V VOUT = 5.0V ACT2804-020 ACT2804-019 VBAT = 8.2V VOUT = 5.0V CH1 CH1 CH2 CH2 CH1: VOUT, 200mV/div CH2: IOUT, 500mA/div TIME: 1ms/div Innovative PowerTM CH1: VOUT, 200mV/div CH2: IOUT, 1A/div TIME: 1ms/div - 19 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2804 Rev 2, Feb-04-2016 PACKAGE OUTLINE QFN55-40 PACKAGE OUTLINE AND DIMENSIONS PIN #1 DOT BY MARKING Top View D SYMBOL D/2 E/2 MAX MIN MAX A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 L 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 Bottom View DIMENSION IN INCHES MIN A3 E DIMENSION IN MILLIMETERS L k 0.400 TYP 0.324 0.476 0.200 MIN 0.016 TYP 0.013 0.019 0.008 MIN b D1 e E1 k A3 A A1 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 firstname.lastname@example.org or visit http://www.active-semi.com. is a registered trademark of Active-Semi. Innovative PowerTM - 20 - www.active-semi.com Copyright © 2016 Active-Semi, Inc.