ACT2823QJ-T1435

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REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. Dual Cell Li-Ion Battery Charger and Power Bank Manager BENEFITS and FEATURES  Simple Design o Single chip charger and power bank con- trol o Power path and battery charge control o Charge/Discharge/Power path control o Automatic output plug-in detection wakeup and no load detection sleep mode  USB Compatible o Vin = 4.5V to 5.5V o Vout = 5.07V +/- 1% o Auto Detection support USB BC1.2, Chi- nese YD/T 1591-2009, Apple, and Samsung o Pass MFi Test o Automatically accommodates weak input power sources.  High Power Capability o 3.3A Load Current o 1.5A Charge Current o Dual Li-Ion Cells – 8.4V/8.7V +/-0.5%  Built in Safety o Over/Under-voltage Protection o Low Power Short Circuit Protection o Battery Over charge/discharge protection o Charge/Discharge Thermal Regulation  Space Savings o Single Chip Design - fully integrated FETs o Integrated LED status reporting o TQFN5x5-40 Package  Power Savings o >92% Efficient o 400kHz o <10uA Battery drain current  Easy system level design o I2C programmability 1MHz o Configurable operating modes and fault conditions o Meets EN55022 Class B Radiated EMI Standard

APPLICATIONS

 Backup Battery Pack  Power Bank  Dual Cell Boost Battery Charger  Bluetooth Speaker  Wearables  POS Machine  Standalone Battery Charger with USB Output GENERAL DESCRIPTION The ACT2823 is a space-saving, dedicated single-chip solution for dual-cell battery charge and discharge control. It is optimized for power bank and battery backup systems. The ACT2823 operates in three modes: charge mode, discharge mode and HZ mode. It charges dual Li-Ion batteries from a USB input while also delivering power to the load. Automatic power path control always gives priority to the load. When the USB input is not present, the ACT2823 powers the load at 5.07V from the batteries. The cycle- by-cycle peak current mode control, constant current regulation, short circuit protection and over voltage protection maximize safe operation. ACT2823’s HZ mode minimizes the batteries current drain to less than 10µA to help maintain fully charged batteries for products with long storage, shipping, and shelf life. ACT2823 provides 4 LED drive pins for battery capacity level and charge status indication to indicate 25%, 50%, 75% and 100% battery charge levels. Multiple LED indications patterns are programmable. ACT2823 is available in a thermally enhanced 5mmx5mm QFN55-40 package with exposed pad. CSP CSN VOUT HSB BAT BATS BATP BATN ICST TH VREG AGNDPB LED1LED2LED3LED4 RIMC 4.7uH ACT2823 PGND 22uF VIN SW VIN 5.07V/3.3A VOUT 20mΩ 25mΩ 22uF22uF 1uF 22uF 22uF 540 k 8k 10k 47nF

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. FUNCTIONAL BLOCK DIAGRAM BATN LEDLS1 LEDLS2 LEDLS3 LEDLS4 PT RIMC HYST FUEL GAUGE VIN Q1 CONTROL SYSTEM CONTROL BOOST CHARGER AND BUCK DISCHARGER PGN D AGND ICST THERMISTOR LED1 LED2 LED3 LED4 CHARGE CONTROL BATS BATP BAT TH USB AUTO DETECTOR PUSH BUTTON DETECTOR HSB SW VOUT CSP CSN OUTPUT CURRENT CONTROL VREG VREG POWER MUX To Adapter or USB port SECONDARY BATTERY PROTECTION OPTIONAL PB SCL SDA I2C CONTROL MCU DP DM OUT PORT ACT2823 TRICKLE CHARGE CONTROL RCS=25mΩ OVGATE OVSENS EXTERNAL FET CONTROL OPTIONAL RCS =25mΩ D- USB Shielding VREG

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi.

ORDERING INFORMATION

PART NUMBER BATTERY EOC VOLTAGE JUNCTION TEMPERATURE PACKAGE PI NS ACT2823QJ-T1000 8.4V -40˚C to 150˚C QFN55-40 40 ACT2823QJ-T1435 8.7V -40˚C to 150˚C QFN55-40 40 Note 1: All Active-Semi components are RoHS Compliant and with Pb-free plating unless specified differently. The term Pb-free means semiconductor products that are in compliance with current RoHS (Restriction of Hazardous Substances) standards. Note 2: Package Code designator “Q” represents QFN Note 3: Pin Count designator “J” represents 40 pins PIN CONFIGURATION– QFN55-40 CSN CSP CSP VOUT VOUT VIN VIN SCL SDA NC HSB SW SW BAT BAT BATS BATP NC PGND LED3 LED2 LED1 PB AGND VREG TH ICST BATN LED4 DP DM HYST RIMC PT LEDLS4 LEDLS3 LEDLS2 LEDLS1 OVGATE OVSENS PGND ACT2823 Top View Figure 1: Pin Configuration – Top View – QFN55-40

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. PIN DESCRIPTIONS - QFN PIN NAME DESCRIPTION 1 CSN Output current sense negative input. 2,3 CSP Output current sense positive input. 4, 5 VOUT Power Output Pin. 6, 7 VIN USB or AC Adapter input. 8 OVGATE Output to drive optional external NMOS protect IC from over voltage. 9 OVSENS USB or AC Adapter input sense pin. 10 SCL I2C clock input. 11 SDA I2C data input. 12 NC Not connected. This pin must be floating. Do not connect this pin to any etch on the PCB. 13 HSB High side bias pin used for high side FET gate drive. Co nnect a 47nF ceramic capacitor from HSB to SW. 14,15 SW Internal switch connected to a terminal of the output inductor. 16,17 BAT Charging output pin. Bypass to PGND with high quality ceramic capacitors placed as close to the IC as possible. Connect to the charging current sense resistor. 18 BATS Battery current sense positive input. Connect to CS res istor positive terminal with Kevin connection. 19 BATP Battery current sense negative input. Connect to CS res istor negative terminal with Kevin connection. 20 NC Not connected. This Pin must be floating. Do not connect this pin to any etch on the PCB. 21 PGND Power ground. 22 BATN Battery negative terminal. Connect directly to PGND. 23 ICST Fast charge current setting pin. Connect a resistor fro m this pin to AGND to set the charging current. The current setting ranges from 0.5A-1.5A. The voltage at this pin reflects the charge current and discharge current in charge mode and discharge mode, respectively. 24 TH Temperature sensing input. Connect to a battery thermisto r terminal. 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 PG ND pad on same layer with IC. 27 PB Push button input. When this pin is pushed for more than 40ms, LED1-4 indicators are enabled for 5 seconds. 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 t he pin to AGND to shift LED1 threshold voltage. 33 LEDLS2 LED2 threshold level shift. Connect a resistor from t he pin to AGND to shift LED2 threshold voltage. 34 LEDLS3 LED3 threshold level shift. Connect a resistor from t he pin to AGND to shift LED3 threshold voltage. 35 LEDLS4 LED4 threshold level shift. Connect a resistor from t he pin to AGND to shift LED4 threshold voltage. 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 Battery impedance compensation input. Connect a resisto r to this pin to offset the LED threshold voltages in charge mode and discharge mode. 38 HYST Hysteresis window setting input. Connect a resistor to ground to set LED1, 2, 3, 4 hysteresis windows. 39 DM Output port auto detection input. Connected to portable d evice D-. 40 DP Output port auto detection input. Connected to portable d evice D+. Exposed Pad PGND Electrically connected to AGND and PGND. Also used as thermal pad to remove heat from the IC. Connect to the top layer ground plane and use recommended thermal vias to internal and back side PCB ground planes.

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. ABSOLUTE MAXIMUM RATINGS PARAMETER VALUE UNIT LEDLS1, LEDLS2, LEDLS3, LEDLS4, RIMC, HYST and PT to GND -0.3 t o +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 BAT to BATN -0.3 to +12 V BATN to GND -0.3 to +0.3 V SW to PGND -0.3 to +12 V HSB to SW -0.3 to +6 V Junction to Ambient Thermal Resistance (θJA) 40 Ԩ/W Operating Junction Temperature (TJ) -40 to 150 Ԩ Operating Temperature Range (TA) -40 to 85 Ԩ Store Temperature -55 to 150 Ԩ Lead Temperature (Soldering, 10 sec) 300 Ԩ Note1: Do not exceed these limits to prevent damage to the devi ce. Exposure to absolute maximum rating conditions for long per iods may affect device reliability. Note2: Measured on Active-Semi Evaluation Kit

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. ELECTRICAL CHARACTERISTICE TABLE (VIN = 5V, TA = 25°C, unless otherwise specified.) Input Current Limit, Over Voltage Protection, Output Under Voltage Protection PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Input Voltage Range 4.5 5.5 V Input Over Voltage Protection VIN rising, V IN_OVP 5.5 5.7 6.0 V Input Over Voltage Hysteresis VIN falling, VIN_OVP_HYST 290 m V Input Under Voltage Lock-Out VIN rising, V IN_UVLO 4.2 V Input Under Voltage Lock-Out Hysteresis VIN falling, VIN_UVLO_H YST 200 mV Input Current Limit Setting Range 3.8 A Output Under Voltage Protection (UVP) VOUT falling, VOUT_UVP 3.65 V Output Under Voltage Protection Hysteresis VOUT rising, VOUT_UV P_HYST 200 mV Q1 Wait Time in Hiccup Mode 3 s Boost Mode/Charge Mode PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Switching Frequency -15% 400 +15% kHz Precondition Voltage Threshold of Total Cells VBAT rising 5.6 V Preconditioning Current Percentage of fast charge current 15 % Boost Charger UVLO VOUT rising, BST_UVLO 4.2 V Battery End-Of-Charge Voltage VBAT_EOC (ACT2823QJ-T1000) -0.5% 8.4 +0.5% V VBAT_EOC (ACT2823QJ-T1435) -0.5% 8.7 +0.5% V Fast Charge Current Setting Ricst=8kΩ -10% 1.0 +10% A End of Charge Detection Current Percentage of fast charge curre nt 10 % Shielding cable Detection Threshold at PB PB falling In charge mode. VIN = 5V VIN-1.5V V Charge Current Foldback Threshold with VIN, Without Shielding Cable Connected Start point 4.7 V End point 4.6 V Charge Current Foldback Threshold with VIN, With Shielding Cable Connected Start point 4.92 V End point 4.82 V Continuous Charging Time after EOC TEOC 45 min Charger Thermal Regulation Temperature 100 110 120 Ԩ

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. Buck mode/Discharge PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Buck Under Voltage Lock-Out VBAT falling, VBAT1,2 5.8 V VOUT Output Regulation Voltage REG3[1:0]=00,Default 5.07 V VOUT Current Limit RCS=20mΩ 3.3 A Buck Converter Under Voltage Protection Thresh- old VOUT falling goes into hiccup 3.65 V Buck Converter Over Voltage Protection Threshold VOUT rising 5.7 V Buck Convert Hiccup Time 3.4 s Buck Converter Light-Load Cut-off Current 5 10 15 mA Buck Converter Light-Load Cut-off Deglitch Time 12.5 s High Side Switch Peak Current Limit All condition 4.5 A Over Temperature Protection OTP 160 Ԩ Over Temperature Protection Hysteresis OTP_HYST 20 Ԩ Battery Protection PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Battery Over Charge Current 2.6 3 A Battery Over Voltage Percentage of EOC Voltage 101 102.5 104 % Battery Under Voltage and Short Circuit Protection 3.2 V Preconditioning timer If timer expires, goes to latch-off 1 h r TH Pull-up Current Charge mode 140 µA Discharge mode 100 µA TH High Threshold Charge mode 2.5 V Discharge mode 2.5 V TH Low Threshold Charge mode 1 V Discharge mode 0.57 V System Management PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VREG Output Current 50 mA PB Rising Threshold PB Rising, discharge mode 0.95 V PB Falling Threshold PB Falling, discharge mode with VIN=5V 0 .75 V PB internal pull up resistance Pull up to internal supply 1.2 M Ω Fault Condition AlarmFrequency 0.5s on and 0.5s off 1.0 Hz Fault Condition Alarm Timer 10 s

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. LED Indication PARAMETER TEST CONDITIONS MIN TYP MAX UNIT LED1-4 Indication Level Setting 5.5 8.8 V LED1-4 Sink Current 3 mA LED1-4 Scan Interval For each LED pattern before lighting LEDs 0.5 s I2C Interface SCL, SDA Input Low VIN = 5V 0.4 V SCL, SDA Input High VIN = 5V 1.25 V SDA Leakage Current SDA=5V 1 µA SDA Output Low IOL = 5mA 0.35 V SCL Clock Frequency, fSCL 0 1000 kHz SCL Low Period, tLOW 0.5 µs SCL High Period, tHIGH 0.26 µs SDA Data Setup Time, tSU 50 ns SDA Data Hold Time, tHD (Note1) 0 ns 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 Pulse Width of spikes must be suppressed on SCL and SDA 0 50 ns Note1: No internal timeout for I2C operations. Note2: This is an I2C system specification only. Rise and fall time of SCL & SDA not controlled by the device. Note2: Device Address is 7’h5A Figure 2: I2C Data Transfer SDA SCL tST tSUtHD tSP tSCL Start condition Stop condition

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. I2C PROGRAMMABLE PARAMETER LIST ITEMS STEP/STATUS DEFAULT Input Current Limit and Q1 VIN UVLO 4.2V, 4.5V 4.2V Buck Converter/Discharge Mode Boost Converter/Charge Mode 8.7V (ACT2823QJ-T1435) Pre-charge voltage threshold 5.6V, 6.0V 5.6V Pre-charge Current 10%, 15%, 20%, 25% 15% EOC Current 6%, 10%, 14%, 18% 10% Fast charge current 60%, 80%, 100%, 120% 100% System VREG ON/OFF in HZ Mode ON, OFF OFF

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. CUSTOMER REGISTER MAP The ACT2823 address is 7’h5A – Write address is 8’hB4 and read address is 8’hB5 Default values for the ACT2823QJ-T are in bold. REG1: Config Discharge (R/W) Bit Name Reset Value Description

7 Spare 00 Spare 6

5 Force Standby 0 0: No Force 1: Force

4 Disable Light Load 0 0: Enable 1: Disable

3 Spare 0 Spare

2 Mask Faults 0 0: No Mask 1: Mask

1 Clear Faults 0 0: No Clear 1: Clear

0 Soft Reset 0 0: No Reset 1: Reset

REG2: Config Discharge (R/W) Bit Name Reset Value Description Spare 000 Spare 6

4 LED Indication Lock-out 0 0: 0s 1: 30s

2 LED Scan Disable 0 0: Enable 1: Disable

1 LED Always Display During Discharge 0 0: Diable 1: Enable

0 LED Breathing PWM Period 0 0: 2s 1: 3s

REG3: Config Discharge (R/W) Bit Name Reset Value Description 7 VIN Current Limit 10 00: 2.75A 01: 0.6A 10: 3.8A 11: 1.15A 6 5 VIN UVLO Level 0 0: 4.2V 1: 4.5V

4 Spare 0 Spare

3 Battery Discharge Cut-off Voltage 10 00: 5.4V 01: 5.6V 10: 5.8V 11: 6.0V 2

1 Spare 00 Spare 0

REG4: Config Discharge (R/W) Bit Name Reset Value Description

7 Charging Time after EOC 1 0: 0s 1: 45 mins

6 Battery Pre-condition Voltage Level 0 0: 5.6V 1: 6.0V

5 Battery Pre-condition Current Level 01 00: 10% 01: 15%

10: 20% 11: 25% 4 Battery EOC Voltage Level 10 00: 8.2V 01: 8.3V 10: 8.4V 11: 8.7V 2 ACT2823QJ-T1000 default = 8.4V (10) ACT2823QJ-T1435 default = 8.7V (11) Battery EOC Current Level 01 00: 6% 01: 10% 10: 14% 11: 18% 0

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. REG5: Config Discharge (R/W) Bit Name Reset Value Description

7 Battery Fast Charge Current Level 10 00: 60% 01: 80%

10: 100% 11: 120% 6

5 VREG ON/OFF in HZ Mode 0 0: OFF 1: ON

4 HZ Latch-off 1 0: No Latch-off 1: Latch-off

3 Spare 00 Spare 2

1 Thermistor Thresholds 1 0: Single 1: Dual

0 Spare 0 Spare

REG6: Config Discharge (R/W) Bit Name Reset Value Description

7 Operation Mode 00 00: Disabled 01: Charge

10: Discharge 11: Not Used 6

5 Battery Charging Status 00 00: Trickle 01: Pre-condition

10: Fast Charge 11: Top Off 4

3 USB Device Status 0 0: Not Connected

1: Connected Spare 000 Spare 1 REG7: Config Discharge (R/W) Bit Name Reset Value Description

7 VIN UV/OV 0 0: No Fault 1: Fault

6 VOUT UV/OV 0 0: No Fault 1: Fault

5 OTP 0 0: No Fault 1: Fault

4 Charge Thermal Foldback 0 0: No Fault 1: Fault

REG8: Config Discharge (R/W) Bit Name Reset Value Description

7 Battery Over Temperature 0 0: No Fault 1: Fault

6 Battery Under Temperature 0 0: No Fault 1: Fault

5 Battery Over Voltage 0 0: No Fault 1: Fault

4 Battery Cut-off 0 0: No Fault 1: Fault

3 Battery Short & Pin Fault 0 0: No Fault 1: Fault

2 Battery Over Current 0 0: No Fault 1: Fault

1 Battery Trickle/Pre-condition Timer Expire 0 0: No Fault 1: Fault

0 Battery Low 0 0: No Fault 1: Fault

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. The following table provides the recommended R ICST values based on RCS=25mΩ and 50mΩ. IC (A) RICST Units RCS=25mΩ R CS=50mΩ 0.8 10 5 kΩ 0.9 8.89 4.44 kΩ 1 8 4 kΩ 1.1 7.27 3.64 kΩ 1.2 6.67 3.33 kΩ 1.3 6.15 3.08 kΩ 1.4 5.71 2.86 kΩ 1.5 5.33 2.67 kΩ Top Off When the battery voltage reaches the End-of-Charge Voltage, the ACT2823 transitions to Top Off mode. Top Off mode charges the battery with a constant voltage. In Top Off mode, the charging current slowly decreases as the actual battery voltage increases and the voltage across the battery’s ESR decreases. The charger stays in Top Off mode until the charging current drops below the EOC (End-of-Charge) current which is 10% of the programmed fast charge current. At this point the battery is considered fully charged and the charger transitions into the End of Charge mode. End-of-Charge When the charging current drops to 10% of the fast charge current, the charger enters End-of-Charge mode. If register 0x04h, bit 7 = 0, the charger immediately turns off. If this bit = 1, the charger continues to charge in constant voltage mode for 45 minutes. In this case, the charge current continues to drop while the battery voltage is held at the End-of-Charge voltage. If the battery voltage drops below 95% of the End-of-Charge voltage, the charger transitions back into Top Off mode. The charger automatically transitions between these four charging modes as the battery voltage increases and decreases during charging and discharging cycles. If a battery is not present during charging mode, the charger regulates its output to the End-of-Charge voltage. If a battery is then connected, the charger automatically transitions to the proper operating mode that is appropriate for the battery’s voltage. If the battery disconnected from the charger, it regulates its output to the End-of-Charge voltage Thermal Regulation The charger contains a thermal regulation feature that prevents the IC from reaching thermal shutdown in high temperature environments. It works in both charge and discharge modes. The charger operates at full charging current when the ACT2823 die temperature is below 110°C. If the die temperature increases above 110°C, the IC reduces charging current at a rate of -10%/°C. This ensures that the output voltage on VOUT has priority over charging the battery. In discharge mode, the IC delivers full current at rated voltage when the temperature is below 130°C. If the die temperature increases above 130°C, the IC decreases the output voltage by -115mV/°C. End-of-Charge Timer When the charger enter the End-of-Charge mode, it either immediately stops charging or continues to charge for 45 minutes. If register 0x04h, bit 7 = 0, the charger immediately turns off. If this bit = 1, the charger continues to charge in constant voltage mode for 45 minutes. Power Path Priority The ACT2823 always gives priority to the system voltage on VOUT. If the input voltage source is current limited and cannot simultaneously provide the full charge current plus the full system current (current out of VOUT), the input voltage would drop and cause a brownout situation on VOUT. The ACT2823 avoids the brownout condition by reducing the charging current if the input voltage drops. If the IC detects that a USB cable is connected, the Charge Current Foldback Threshold voltage starts at 4.92V. If no USB cable is detected, the starting voltage is 4.7V. The charger linearly reduces charge current from full charge current to 0A as the voltage on VIN drops from 4.7V to 4.6V or from 4.92V to 4.82V, depending on whether or not a USB cable is detected. The charger also reduces the charging current if the total input current (charging current plus system current) exceeds 80% of the programmed input current limit (ILIM) threshold of 3.8A. Charging current is linearly reduced from full charge current to 0A as the input current increases from 80% of ILIM to 100% of ILIM. Operating Modes The ACT2823 automatically switches between several different operating modes, depending on circuit conditions. Charge Mode When input power is applied and there are no faults, the IC operates in Charge Mode. Charge Mode turns on Q1 to power VOUT with the input voltage. Note that Q1 stays off and VOUT is not present in Trickle Charge mode. Charge mode configures the switches Q2 and Q3 as a boost converter to charge the battery. The IC automatically enters Charge Mode when input power is applied. There is a 2s delay when transitioning from Discharge Mode to charge mode. During this time, the IC goes into HZ mode

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. Discharge Mode In Discharge Mode, the ACT2823 turns off Q1 and reconfigures Q2 and Q3 as a buck converter. It powers the VOUT pin from the battery. The default VOUT voltage is 5.07V and current limit is set at 3.3A. If a charged battery is present when input power is removed, the IC enters Discharge Mode. There is a 2s transition between Charge Mode and Discharge Mode. During this time, the IC goes into HZ mode. HZ Mode HZ mode is a low power mode that minimizes current draw from the battery. All switches are turned off, and only the push button circuit is kept alive. The IC draws less than 10uA current from VBAT in HZ Mode. The IC transitions from Discharge Mode to HZ Mode when the load current is less than 10mA for greater than 12.5s or when the pushbutton is pressed for greater than 5s. The IC also enters HZ Mode when a battery fault is detected. The IC stays in HZ Mode indefinitely until input voltage is applied. When input voltage is applied and there are no faults, it enters Charge Mode. The user can force a transition from HZ Mode to Discharge Mode by asserting the push button for greater than 40ms. Push Button The ACT2823 push button serves several purposes. It can be automatically pulled low when a shielded cable or a portable device is connected to VOUT. When in HZ Mode, and PB is pulled low for greater than 40ms, it turns on the LEDs for 5s and the IC transitions to Discharge Mode. This allows the user to wake up the IC to power a portable device. The PB falling threshold is 0.95V when in HZ Mode. When in Charge Mode, pulling PB below 3.5V tells the IC that a shielded USB cable or a downstream portable device is connected to VOUT. This changes the Charge Current Foldback Voltage threshold from 4.7V to 4.92V. Increasing this threshold gives more current priority to the portable device connected to VOUT. If the portable device is removed and PB rises above 3.5V, the Current Foldback Threshold drops back to 4.7V. Figure 8 shows the recommended circuit for automatically detecting the shielded cable or portable device connection. R26, R14 and C16 form the detection circuit. Connect R14 and C16 to the USB output connector shield to detect the insertion of a shielded cable. Connect to the USB cable’s output voltage to detect insertion of a portable device. LED Indication ACT2823 has 4 LED inputs to visually communicate the battery status. A resistor from PT to AGND programs the LED mode. In all modes, when the battery is discharging, LED1 flashes to indicate a low battery when the battery voltage is lower than the VLED1 threshold. In all modes, all LEDs turn on solid when the battery charger is in the End-of-Charge Mode. Conventional – Always On Mode Setting R PT=4kΩ programs Conventional – Always On Mode. The LEDs are always active when the IC is in Charge or Discharge Mode. The LEDs are solid to indicate Charge Mode and flash to indicate Discharge Mode. Figure 4 shows each LED function relative to the VBAT voltage. Conventional Mode Setting R PT=12kΩ programs Conventional Mode. The LEDs are always active when the IC is in Charge Mode. They only turn on for 5s when PB is pulled low for greater than 40ms in Discharge Mode. The LED pattern is identical to Conventional – Always On Mode. Figure 4 shows each LED function relative to the VBAT voltage. Breathing Mode Setting R PT=24kΩ programs Breathing Mode. The LEDs are always active when the IC is in Charge Mode. They only turn on for 5s when PB is pulled low for greater than 40ms in Discharge Mode.In Charge Mode, the LEDs appear to “breath” as the IC ramps the current back and forth between 0mA and 3mA at a 2s rate. In Discharge mode, the LED pattern is identical to Conventional Mode. Figure 4 shows each LED function relative to the VBAT voltage. Bottom Charging Mode Setting R PT=40kΩ programs Bottom Charging Mode. The LEDs are always active when the IC is in Charge Mode. They only turn on for 5s when PB is pulled low for greater than 40ms in Discharge Mode. In Charge Mode, the LED cycle starts with all LEDs off. LED1 turns on, then LED2 turns on, etc. until the highest LED corresponding to the battery voltage turns on. Then all L E D s t u r n o f f . T h i s c y c l e r e p e a t s e v e r y 0 . 5 s . I n Discharge mode, the LED pattern is identical to Conventional Mode. Figure 4 shows each LED function relative to the VBAT voltage. Circulating Mode Setting R PT greater than 56kΩ programs Circulating Mode. R PT can be left open to program Circulating Mode.The LEDs are always active when the IC is in Charge Mode. They only turn on for 5s when PB is pulled low for greater than 40ms in Discharge Mode. In Charge Mode, when the battery voltage is over an LED’s threshold, that LED stays on. The higher threshold LEDs turn on one at a time until they are all on. They then turn off. The cycle repeats every 0.5s. In Discharge mode, the LED pattern is identical to Conventional Mode. Figure 4 shows each LED function relative to the VBAT voltage. LED1-4 Refresh Cycle Every time VIN is applied or PB is pulled low, the LEDs

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. The following equations calculate the proper external resistor network to set the upper and lower charging temperature thresholds. )8(hotRcIV CHGTCL  )9(coldRIV CHGTCH  )10(RRa RRaRbhot NTCh NTCh Rc )11(RRa RRaRbcold NTCc NTCc R 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, using an NXRT15XH103 NTC resistor and a temperature charging range of 0 Ԩ to 45 Ԩ,we know R NTCC=27.219k and 4.917k at 0 Ԩand 45 Ԩ respectively. We can calculate Ra=33kΩ and Rb=2.87kΩ based on the above formulas. Follow this procedure for any other NTC and charging temperature range. If temperature sensing is not used, connect TH to ground through a 10kΩ resistor. I2C Serial Interface The ACT2823 provides the user with the ability to change operating parameters via I 2C commands. The Customer Register Map section of the datasheet shows the parameters that can be modified. All changes to I registers are volatile. All registers reset to their default settings when power is recycled. The ACT2823 operates as a slave device, and is ad- dressed using a 7-bit slave address of 0x5Ah, followed by an eighth bit, which indicates whether the transaction is a read-operation or a write-operation, 1011010x. “x” is a 0 for write operation and 1 for a read operation. Use address 0xB4h for write operations and 0xB5h for read operations. There is no timeout function in the I 2C packet pro- cessing state machine, however, any time the I2C state machine receives a start bit command, it immediately resets the packet processing, even if it is in the middle of a valid packet.

APPLICATION INFORMATION

The ACT2823 uses current-mode control and a proprietary internal compensation scheme to simplify external component selection. It is optimized for operation with 4.7μH inductors. Choose an inductor with a low DC-resistance, and avoid inductor saturation by choosing inductors with DC ratings that exceed the maximum output current by at least 30%. Design for an inductor ripple current that is approximately 30% of the m a x i m u m o u t p u t c u r r e n t . T h e f o l l o w i n g e q u a t i o n calculates the inductor ripple current is ܫ ௅ ൌ ቀ1െ ௏ೀೆ೅ ௏ಳಲ೅ ை௎் ܮሺ12ሻ Where VOUT is the 5V output voltage, VBAT is the battery voltage, F SW is the switching frequency, and L is the inductor value. Output Capacitor Selection VOUT requires high quality, low-ESR, ceramic capacitors. Three 22uF capacitors are typically suitable. An additional smaller 0.1uF capacitor assists with high frequency filtering. Smaller capacitors can be used with smaller loads but the capacitance should not go below 44uF for stability reasons. Choose the capacitance to keep the output ripple voltage less than approximately 50mV. The following equation calculates the output voltage ripple. V RIPPLE௅ ை௎் ሺ13ሻ Be sure to consider the capacitor’s DC bias effects and maximum ripple current rating when using capacitors smaller than 0805. A capacitor’s actual capacitance is strongly affected by its DC bias characteristics. The output capacitor is typically an X5R, X7R, or similar dielectric. Use of Y5U, Z5U, or similar dielectrics are not recommended due to their wide variation in capacitance over temperature and voltage ranges. Input Capacitor Selection The input capacitor on VIN requires a high quality, low- ESR, ceramic input capacitor. A 22uF capacitor is typically suitable, but this value can be increased without limit. Smaller capacitor values can be used with lighter output loads. Choose the input capacitor value to keep the input voltage ripple less than 50mV. Battery Capacitor Selection The BAT pin requires high quality, low-ESR, ceramic capacitors. Two 22uF capacitors are typically suitable. An additional smaller 0.1uF capacitor assists with high frequency filtering. Smaller capacitors can be used with smaller loads but the capacitance should not go below 22uF. These capacitors are the output capacitors to the charging boost converter and the input capacitors to a discharging buck converter, so they must be placed as close as possible to the BAT pin and be directly to the PGND plane. Choose the capacitance to keep the ripple voltage less than 50mV. Use the following equation to calculate the minimum input capacitance.

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. ை௎் ∗ ௏ೀೆ೅ ௏ಳಲ೅ ∗ቀ1െ ௏ೀೆ೅ ௏ಳಲ೅ ቁ ሺ14ሻ Where I OUT i s t h e l o a d c u r r e n t , VOUT is the 5V output voltage, VBAT is the battery voltage, FSW is the switching frequency, and VRIPPLE is the desired ripple voltage. Charge Current Sense Resistor C h o o s e a c h a r g e c u r r e n t s e n s e r e s i s t o r s o t h e f a s t charge current through it results in a current sense voltage between 20mV-75mV. Typical resistor values are 25mΩ to 50mΩ. The traces to the BATP and BATS pins must be Kelvin sensed to ensure accuracy. In noisy environments placing a 100nF capacitor between BATP and BATS will improve noise immunity. Output Sense Resistor Choose an output current sense resistor so the maximum load current through it results in a current sense voltage greater than 10mV. The traces to the CSP and CSN pins must be Kelvin sensed to ensure accuracy. The following equation sets the output current limit I OUT_CLܸ ሺ15ሻ Where RCS is the current sense resistor between CSN and CSP. PCB Board Layout Guidance When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the IC. 1. Place the BAT decoupling capacitors as close to the Bat pin as possible. Minimize the loop area between the BAT pin to the capacitors to the PGND pin. If using different sized capacitors, place the physically smaller capacitors closer to the IC to get better high frequency filtering. 2. Arrange the power components to reduce the overall AC loop area. 3. Place the VOUT decoupling ceramic capacitors close to the VOUT pin. Connect the ground side to the PGND plane. 4. Place the VIN decoupling ceramic capacitors close to the VIN pin. Connect the ground side to the PGND plane. 5. Use Kevin sense connections from the output current sense resistor to CSP and CSN pins, and from the battery charging current sense resistor to BATS and BATP . 6. SW node is noisy and should be isolated from other sensitive circuitry. Make the connection from SW to the inductor with a short, wide trace for good EMI and low noise operation. 7. The exposed pad is must be connected to the top layer GND plane. Connect it to the internal and bottom layer ground planes using thermal vias. PGND and AGND should be single-point connected to the exposed pad under the IC. 8. An RC snubber and external Schottky diode across SW to PGND can be added as needed for reducing switching spikes and better EMI performance. Application Circuit The following schematic represents a typical application circuit.

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. Schematic Output USB CSN CSP CSP VOUT VOUT VIN VIN OVGATE OVSENS SCL SD A NC HSB SW SW BAT BAT BATS BATP NC PGND BATN ICST TH VREG AGND PB LED1 LED 2 LED3 LED4 LEDLS1 LEDLS2 LEDLS3 LEDLS4 PT RIMC HYST DM DP BAT2 BAT1 R6R7R8R9R15R10 LED1 LED2 LED3 LED4 ACT2823 PGND Input USB C10 C6 C7 C15 C14 C19 C16 R1 1 R12 R32 R27 R14 R26 R17 C20 C11C12C13 C8 MCU R33 RNTC Input OVP Figure 8: Typical Application Circuit

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. BOM Item Reference Description QTY Manufacturer 1 L1 SWPA8040S4R7NT 4.7uH 5.9A(8*8*4mm) 1 Sunlord

2 D1 MBR1020VL, 20V/1A Schottky, SMA, Optional 1 Panjit

3 Q1 AO3400A, Rds(on)<32mΩ at V GS=4.5V, optional 1 AOS

4 C1,C7,C8 Ceramic capacitor, 22uF/16V, X7R, 1206 3 Murata/TDK

5 C2 Ceramic capacitor, 4.7uF/10V, X7R, 0805 1 Murata/TDK

6 C3,C10,C11,C12 Ceramic capacitor, 22uF/10V, X7R, 1206 4 Murat a/TDK

7 C4 Ceramic capacitor, 47nF/16V, X7R, 0603 1 Murata/TDK

8 C6,C13 Ceramic capacitor, 0.1uF/16V, X7R, 0603 2 Murata/TDK 9 C14 Ceramic capacitor, 2.2nF/10V, X7R, 0603 1 Murata/TDK

10 C15 Ceramic capacitor, 1uF/10V, X7R, 0603 1 Murata/TDK

11 C16 Ceramic capacitor, 2.2uF/10V, X7R, 0603 1 Murata/TDK 12 C19 Ceramic capacitor, 3.3uF/10V, X7R, 0603 1 Murata/TDK

13 C20 Ceramic capacitor, 100nF/10V, X7R, 0603 1 Murata/TDK

14 R1 Chip Resistor, 2.7Ω, 1/8W, 5%, 0805 1 Murata/TDK

15 R2 Chip Resistor, 20mΩ, 1/2W, 1%, 1206 1 SART

16 R3 Chip Resistor, 25mΩ, 1/2W, 1%, 1206 1 SART

17 R5 Chip Resistor, 8kΩ, 1/10W, 1%, 0603 1 Murata/TDK

18 R6 Chip Resistor, 83kΩ, 1/10W, 1%, 0603 1 Murata/TDK

19 R7 Chip Resistor, 63.5kΩ, 1/10W, 1%, 0603 1 Murata/TDK 20 R8 Chip Resistor, 51.4kΩ, 1/10W, 1%, 0603 1 Murata/TDK 21 R9 Chip Resistor, 41.5kΩ, 1/10W, 1%, 0603 1 Murata/TDK

22 R10,R11 Chip Resistor, 540kΩ, 1/10W, 1%, 0603 2 Murata/TDK

23 R12 Chip Resistor, 0.47Ω, 1/8W, 1%, 0805 1 Murata/TDK

24 R14,R26 Chip Resistor, 715kΩ, 1/10W, 5%, 0603 2 Murata/TDK

25 R15 Chip Resistor, 12kΩ, 1/10W, 1%, 0603 1 Murata/TDK

26 R17 Chip Resistor, 10Ω, 1/10W, 5%, 0603 1 Murata/TDK

27 R27 Chip Resistor, 100Ω, 1/10W, 1%, 0603 1 Murata/TDK

28 R32 Chip Resistor, 3kΩ, 1/10W, 1%, 0603 1 Murata/TDK

29 R33 Chip Resistor, 32kΩ, 1/10W, 1%, 0603 1 Murata/TDK

30 R NTC 103AT NTC Thermistor, NXRT15XH103V 1 Murata/TDK

31 LED1,LED2,

LED3,LED4 LED, 0603, Blue 4 LED Manu

32 PB Push Button Switch 1

33 Output USB 10.2*14.6*7mm,4P 1

34 Micro-USB MICRO USB 5P/F SMT B 1

35 U1 IC, ACT2823 QFN 5X5-40 1 ACT

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. Typical Performance Characteristics (Schematic as shown in Figure 8, Ta=25°C unless otherwise specified)

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi.

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi.

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. PACKAGE OUTLINE AND DIMENSIONS QFN55-40 D E PIN #1 DOT BY MARKING A3 A Top View D/2 E/2 b e L Bottom View k SYMBOL DIMENSION IN MIL- LIMETERS 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 0.400TYP 0.016 TYP L 0.324 0.476 0.013 0.019 k 0.200 MIN 0.008 MIN Active-Semi, Inc. reserves the right to modify the circuitry or specifications without notice. Users should evaluate each produ ct 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 ci rcuit 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 sales@ac- tive-semi.com or visit http://www.active-semi.com. is a registered trademark of Active-Semi.

REV 1, 01-DEC-2016 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi.

REVISION HISTORY

1 05-DEC-2016 General clarification of device functionality. No IC functional changes or EC table changes from Rev 0 to Rev 1