ACT2813/ACT2813C Rev 2, 19-May-15 5V/2.4A Power Bank Solution FEATURES APPLICATIONS • Dedicated Single Chip Solution for Mobile Power • • • • With Minimal Component Count • 2.4A Continuous Output Current in Boost Mode • 2.4A Switching Charger Current • 96% Boost Efficiency (Vbat=4.1V) GENERAL DESCRIPTION • Adaptive to 10mA-2400mA Input Sources • Battery Disconnection at Output Short • <10µA Low Battery Leakage Current at HZ • • • • • • • • • • • • • Power Bank Mobile Power Backup Battery Pack Standalone Battery Charger with USB Output ACT2813/ACT2813C is a space-saving and highperformance low-profile single-chip solution for backup battery pack and standalone battery charger. ACT2813/ACT2813C integrates all the functions that a backup battery pack needs, including switching charger, boost converter and LED indication. Mode During Storage Boost Auto Turn-off at No Load and Push Button Turn-on Battery Over Current, Over Voltage, Over Temperature and Short Circuit Protections Boost Auto Startup with Load Detection Prioritized Power Path from Input to Output 5V+/-100mV Output Voltage in Boost Mode 1.1MHz/0.55MHz Switching Frequencies 2.2uH Inductor and Low Profile Ceramic Capacitor 4 LEDs Battery Level and Status Indication Battery Impedance Compensation Full Cycle of Battery Charge Management Preconditioning, Fast Charge, Top off and End of Charge Charge Current Foldback at 110°C Die Temperature IC Over Temperature Protection at 160°C FCQFN 4x4-20 Package ACT2813/ACT2813C operates at 1.1MHz for switching charger and 0.55MHz for boost converter allowing tiny external inductor and capacitors. ACT2813/ACT2813C provides a direct power path from input to output while providing power to switching charger. Output has higher priority than battery charger if the input current limit is reached. ACT2813/ACT2813C charges battery with full cycle of preconditioning, fast charge with constant current and constant voltage until end of charge. The battery charger is thermally regulated at 110°C with charge current foldback. ACT2813/ACT2813C boost converter steps battery voltage up to 5V. Boost converter features high efficiency, constant current regulation, short circuit protection and over voltage protection. ACT2813/ACT2813C provides 3.5mA constant currents to drive 4 LEDs to indicate battery level and charge status. Battery impedance is compensated for battery level indication. Boost Output Voltage (V) Boost CC/CV Profile 5.5 VBAT =3.2V 5.0 VBAT =3.7V 4.5 4.0 VBAT =4.1V 3.5 3.0 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 Output Current (A) Innovative PowerTM -1- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 ORDERING INFORMATION PART NUMBER OUTPUT CHARGE CURRENT BATTERY VOLTAGE FLASHLIGHT TH PIN PACKAGE ACT2813QY-T 5V/2.4A 2.4A 4.2V No Yes FCQFN 4x4-20 ACT2813QY-T0435 5V/2.4A 2.4A 4.35V No Yes FCQFN 4x4-20 ACT2813CQY-T 5V/2.4A 2.4A 4.2V Yes No FCQFN 4x4-20 ACT2813CQY-T0435 5V/2.4A 2.4A 4.35V Yes No FCQFN 4x4-20 PIN CONFIGURATION Innovative PowerTM -2- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 PIN DESCRIPTIONS PIN NAME 1 LED1 Battery level indicator. An internal 3.5mA sink current limit is built in. 2 ICST Fast charge current setting pin. Connect a resistor from this pin to AGND to set the charge current. The current setting ranges from 1.0A-3.0A. 3 IOST Output current setting. Connect a resistor from this pin to AGND to set output constant current. The current setting ranges from 1.0A-3.0A. 4 CSP Positive terminal of charge current sense input. Kevin sense is required with 10nF ceramic capacitor right across CSP and CSN pins. 5 VBAT/CSN Battery input and negative terminal of charge current sense input. Connected to the battery pack positive terminal to provide power in High-Z mode. Bypass to PGND with a high quality ceramic capacitor placed as close to the IC as possible. 6 PGND Power ground. PGND is connected to the source of low-side N-channel MOSFET and the MOSFET’s gate driver. PGND must be connected to AGND externally through ground plane. 7, 8 SW 9 VOUT 10 VIN 11 AGND Analog ground. AGND must be connected to PGND externally through ground plane. 12 nPG Drive external P-FET to protect output short circuit and leakage during shutdown. nPG pin is pulled up to VOUT internally. nPG pin is pulled low if VOUT is in the range. 13 PB Push button input, connect a push button from this pin to AGND, internally pulled up by a 3MΩ resistor to battery. PB starts up boost converter if HZ pin is grounded and VIN is not present. When this pin is pushed for 30ms, LED1-4 indicators are enable for 5 seconds. 14 HZ Boost/high-Z mode enable pin, internally pulled up by a 3MΩ resistor to battery. When HZ pin is pulled ground, boost is enabled if VIN is not present. 15 TH/FLD DESCRIPTION Internal switch to output inductor terminal. Output pin. Bypass to PGND with a high quality low ESR and ESL ceramic capacitor placed as close to the IC as possible. USB or AC adaptor input. When VIN is valid, charge and power path is enabled. TH: ACT2813 Temperature sensing input. Connect to battery thermistor terminal. If no use, put 10K pulled down resistor. FLD: ACT2813C Open-drain flashlight driver. A internal switch can handle up to 50mA. 16 BLVS Battery level voltage shift. Connect a resistor from this pin to AGND to shift the battery LED indication thresholds. 17 RIMC Battery impendence compensation input. Connect to a resistor from this pin to APNG to program the battery impedance. 18 LED4 Battery level indicator. An internal 3.5mA sink current limit is built in. 19 LED3 Battery level indicator. An internal 3.5mA sink current limit is built in. 20 LED2 Battery level indicator. An internal 3.5mA sink current limit is built in. 21 EP Innovative PowerTM Exposed pad. Must be soldered to ground on the PCB. -3- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 ABSOLUTE MAXIMUM RATINGSc PARAMETER VALUE UNIT -0.3 to 6.5 V Junction to Ambient Thermal Resistance 40 °C/W Maximum Power Dissipation 2.5 W Operating Ambient Temperature -40 to 85 °C Operating Junction Temperature -40 to 150 °C Storage Junction Temperature -40 to 150 °C 300 °C All the Pin to PGND and AGND Lead Temperature (Soldering 10 sec.) c: 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 -4- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 ELECTRICAL CHARACTERISTICS (VIN = 5V, TA = 25°C, unless otherwise specified.) PARAMETER TEST CONDITIONS MIN TYP MAX UNI T 5.5 V 6.5 V Input Current Limit Input Voltage Range 4.5 VIN Over Voltage Protection VIN rising, VIN_OVP 5.5 6.0 Input Voltage Validation Time VIN_UVLO<VIN<VIN_OVP 32 Leakage Current from VOUT to VIN in Boost Mode 3.0V<VBAT<4.2V, Ta=25℃ 0 10 µA Battery Discharge Current in High-Z Mode 3.0V<VBAT<4.2V, Ta=25℃ 7.5 15 µA ms Power Switches VIN-to-VOUT FET on Resistance 60 mΩ VOUT-to-SW FET on Resistance 45 mΩ SW-to-PGND FET on Resistance 45 mΩ Buck Converter Switching Frequency High Side Switch Peak Current Limit -15% 1.1 4.5 6 A 100 ns Minimum On-time +15% MHz Over Temperature Protection (OTP) OTP rising 160 ℃ OTP Hysteresis OTP falling 35 ℃ Charge Mode Charge Current Setting Range Rcs=25mΩ, RICST=20kΩ—60kΩ Charge Current Setting (ICHRG) Rcs=25mΩ, RICST=48kΩ 1.0 -10% Thermal Regulation Temperature 2.4 3.0 A +10% A 110 ℃ ACT2813/ACT2813C -0.5% 4.2 +0.5% V ACT2813-T0435/ACT2813C-T0435 -0.5% 4.35 +0.5% V End of Charge (EOC) Voltage Battery Over Voltage Threshold VBAT rising 4.6 V Battery Over Voltage Threshold Hysteresis VBAT falling 200 mV Fast Charge Current VBAT=3.5V ICHRG A Precondition Charge Current 2.4V≤VBAT≤2.8V, Percent of ICHRG 10 % Precondition Voltage Threshold VBAT rising 2.8 V 130 mV Precondition Voltage Threshold Hysteresis Innovative PowerTM -5- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 ELECTRICAL CHARACTERISTICS (VIN = 5V, TA = 25°C, unless otherwise specified.) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Low VBAT Charge Current VBAT=1V, RICST=48kΩ 200 mA EOC Current Threshold VBAT=4.2V, percent of the fast charge current 15 % 200 mV Charge Restart Voltage Threshold TH Upper Temperature Voltage Threshold Cold detect NTC thermistor, ACT2813 1.5 V TH Lower Temperature Voltage Threshold Hot detect NTC thermistor, ACT2813 0.3 V TH Hysteresis ACT2813 50 mV TH Internal Pull-up Current ACT2813 60 µA Charge Current Foldback Charge Current Reduction Threshold1 of Vout1 Starting foldback point Charge Current Reduction Threshold2 of Vout1 Stop foldback point, RCS=25mΩ, RICST=48kΩ 4.59 4.7 4.81 4.57 V V Boost Mode Input Voltage Operation Range 3.0 Switching Frequency -15% 0.55 4.5 V +15% MHz Input Voltage UVLO VBAT rising 3.3 V Input Voltage UVLO Hysteresis VBAT falling 400 mV Output Voltage (VOUT) Ta=25℃ Output Voltage Accuracy All conditions 4.97 5.05 5.10 V -3 VOUT 2 % 80mA-1A-80mA, 0.1A/us 4.75 5.25 V 1A-2.4A-1A, 0.1A/us 4.7 5.25 V Output Voltage Transient Response Output Over Voltage Protection VOUT rising 5.7 V Output Over Voltage Protection Hysteresis VOUT falling 300 mV Output Current Regulation Range Rcs=25mΩ, RIOST=37.4kΩ—113kΩ Output Current Rcs=25mΩ, RIOST=91kΩ The Maximum Voltage Across VRcs All conditions 1.0 -10% Minimum On-Time Low Side Switch Peak Current Limit Innovative PowerTM VBAT=3.6V, VOUT=5V -6- 5.6 2.4 3.0 A +10% A 200 mV 100 ns 6.8 A www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 ELECTRICAL CHARACTERISTICS (VIN = 5V, TA = 25°C, unless otherwise specified.) PARAMETER TEST CONDITIONS MIN Soft-Startup Time TYP MAX UNIT 400 µs VOUT falling 4.25 V VOUT rising 4.6 V 3 ms Under Voltage Protection (UVP Threshold) UVP Blanking Time During Startup UVP Sense Detection Time VOUT falling 20 µs Restart After UVP Hiccup mode 2 s Light Load Current Shut off Threshold VBAT=3.7V, Rcs=25mΩ,RIOST=91kΩ 40 Light Load Current Detect Time 16 HZ Pin High Voltage HZ voltage rising HZ Pin Low Voltage HZ voltage falling 0.9 0.4 HZ Internal Pull-up Resistor PB Turn off Boost Time 100 ACT2813 PB Turn on Boost Time mA s 1.4 V 0.75 V 3 MΩ 1.5 s 30 ms 2 s Mode Transition Transition Waiting Time between Charge Mode and Boost Mode TRANTIME Battery Level Indication Battery Impedance Compensation Range Battery Impedance Compensation 40 Rcs=25mΩ, RIMC=200kΩ PB Deglitch Time PB High Input Voltage PB voltage rising PB Low Input Voltage PB voltage falling PB Internal Pull-up Resistor 500 200 mΩ 30 ms 0.9 0.4 mΩ 1.4 V 0.75 V 3 MΩ 5 s LED Indication Time PB is pushed and released LED Flash Frequency Charging, LED flash 1s on and 1s off 0.5 Hz Flashlight Driver Current ACT2813C, the current at FLD pin 50 mA PB Turn on Flashlight Time ACT2813C 3.0 s PB Turn off Flashlight Time ACT2813C 3.0 s Flashlight Driver Innovative PowerTM -7- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 FUNCTIONAL BLOCK DIAGRAM FOR ACT2813 FUNCTIONAL BLOCK DIAGRAM FOR ACT2813C Innovative PowerTM -8- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 FUNCTIONAL DESCRIPTION switches Q1-Q3 into HZ mode for 2 seconds before enabling the other mode. ACT2813/ACT2813C is a complete battery charging and discharging power management solution for applications of single-cell lithium-based backup battery pack or power bank. There is a power path from input to output. If output voltage drops below 4.25V, the input switch Q1 turns off and restart in 2 seconds. The modes are determined by HZ pin and VIN pin as shown in the table 1. A valid VIN voltage forces ACT2813/ACT2813C into charge mode. Boost mode is enabled if HZ pin is pulled low and VIN is invalid or not present. When HZ=0, if PB is pulled low for more than 30ms, boost converter is enabled. For ACT2813, a running boost is disabled if one of the following conditions is met: With the advanced ACT2813/ACT2813C architecture, a synchronous buck/boost converter is connected from VOUT to switching node (SW). With the bidirectional architecture, the converter could be configured as either buck to charge battery or boost to discharge battery. With switching charger and discharger, the higher charge current and higher conversion efficiency are achieved. Boost converter output current is below light load threshold for 16 seconds. 2. Battery voltage falls below the boost cut-off threshold. 3. After PB is released, if PB is pulled low for more than 1.5 seconds. 1. Modes of Operation ACT2813/ACT2813C has 3 operation modes: charge mode, boost mode and high-impedance (HZ) mode. In charge mode, the input current limit Q1 is enabled and Q2 and Q3 operate as a buck converter to charge battery. In boost mode, Q2 and Q3 operate as boost converter to step battery voltage up to +5V at VOUT, and the current limit switch Q1 is turned off, and the reverse current from VOUT to VIN is blocked. In HZ mode, all the switches are turned off and the drainage current from battery is very low. ACT2813 system operation flow chart as shown in Figure 1 and ACT2813C system operation flow chart as shown in Figure 2. Table 1: Mode Selection HZ PIN 0 0 1 1 VIN Valid 0 1 0 1 Mode Boost Charge HZ Charge Flashlight ACT2813C has an flashlight function. Once PB is pressed for more than 3 seconds, the flashlight is switched on. The driver will deliver up to 50mA current to the flashlight. During flashlight on, if PB is pressed for 3 seconds, flashlight will be switched off. Any transitions between boost mode and charge mode go through HZ mode by turning off all the Figure 1: ACT2813 System Operation Flow Chart Innovative PowerTM -9- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 Figure 2: ACT2813C System Operation Flow Chart Latch-Off ACT2813/ACT2813C has latch off function. If discharging stops due to battery cut-off, and latch off will be triggered, it would prevent battery from discharging again, latch-off is released when input power is recycled. Switching Battery Charger ACT2813/ACT2813C is configured in charge mode (buck mode) when VIN is valid. In this mode, the battery is charged with preconditioning, fast charge, top-off and end of charge (EOC). The typical charge management is shown in Figure 3 and Figure 4. CC/CV Regulation Loop There are CC/CV regulation loops built in ACT2813/ ACT2813C, which regulates either current or voltage as necessary to ensure fast and safe charging of the battery. In a normal charge cycle, this loop regulates the current to the value set by the external resistor at the ICST pin. Charging continues at this current until the battery cell voltage reaches the termination voltage. At this point the CV loop takes over, and charge current is allowed to decrease as necessary to maintain charging at the termination voltage. Precondition Charge A new charging cycle begins with the precondition state, and operation continues in this state until VBAT exceeds the precondition threshold voltage. When operating in precondition state, the cell is charged Innovative PowerTM - 10 - at a reduced current, 10% 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, buck converter charges battery with constant current. In fast charge state, the ACT2813/ ACT2813C 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 ACT2813/ACT2813C charges in top off state. Top Off With the battery voltage approaches the EOC voltage, charge current decreases as charging continues. In the top off state, the cell is charged in constant voltage (CV) mode. During a normal charging cycle charging proceeds until the charge current decreases below the end of charge (EOC) threshold, defined as 15% of fast charge current. When this happens, the state machine terminates the charge cycle and jumps to the EOC state. End of Charge When charges current decreases to 15% of set fast charge current, the buck converter goes into end of charge mode and keep monitoring the battery voltage. www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 Recharge When battery voltage drops by 200mV below the end of charge voltage, the charger is reinitiated with constant current charge. Figure 3. Typical Li+ Charge Profile and ACT2813/ACT2813C Charge States A: PRECONDITION STATE B: FAST-CHARGE STATE C: TOP-OFF STATE D: END-OF-CHARGE STATE Figure 4. Charger State Diagram Innovative PowerTM - 11 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 table 3. The LED status is based on battery voltage and operation modes. When battery voltage is low, LED1 is flashing. In charge mode, when a battery is fully charged, flashing stops and all the 4 LEDs are solid on. APPLICATIONS INFORMATION Battery level voltage shift (BLVS pin) LED1-4 voltage thresholds are adjusted from HZ mode during charging and discharging based on the compensated impedance. Those thresholds are programmed by a resistor connected from BLVS pin to AGND as shown in Figure 5. The following equation shows the LED4 voltage threshold: VBATLED4 (V ) = 3.5(V ) + 0.01( mA ) × RBLVS ( kΩ ) Fast Charge Current Battery fast charge current is set by a resistor connected from ICST pin to AGND as shown in Figure 6. The battery fast charge current is estimated as the following equation: (1) Ic( A ) = 1.25( A ) × Figure 5. RICST ( kΩ ) Rcs( mΩ ) (2) Battery level voltage shift setting circuit As long as LED4 is set, all the other 3 LED thresholds is fixed as shown in the table 2: Figure 6. Figure 7 gives out different fast charge current with various RICST. Table 2: 4 LED Voltage Thresholds RBLVS (ohm) 50K 60K 70K 80K LED1 3.55V 3.65V 3.75V 3.85V LED2 3.65V 3.75V 3.85V 3.95V LED3 3.80V 3.90V 4.00V 4.10V LED4 4.00V 4.10V 4.20V 4.30V Battery fast charge current setting circuit 3.0 VIN = 5.0V Vbat=3.7V ICHRG (A) 2.5 2.0 1.5 1.0 0.5 0 LED Status Indication 0 4 LEDs ON/OFF and flash show the charge status and the remained capacity level as shown in the 10 20 30 40 50 60 RICST (kΩ) Figure 7. Battery fast charge current setting Table 3: LED Indication Charge Mode PB time>30ms (Boost or HZ Mode) LED LED1 LED2 LED3 LED4 LED1 LED2 LED3 LED4 VBAT<2.9V Flash Off Off Off Off Off Off Off 2.9V≤VBAT<LED1 Flash Off Off Off Flash Off Off Off LED1≤VBAT<LED2 On Flash Off Off On Off Off Off LED2≤VBAT<LED3 On On Flash Off On On Off Off LED3≤VBAT<LED4 On On On Flash On On On Off VBAT≥LED4 On On On Flash On On On On VBAT≥LED4 (End of Charge) On On On On On On On On Innovative PowerTM - 12 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 Select RIMC based on battery impedance: Boost Output Constant Current Boost output current is set by a resistor connected from IOST pin to AGND as shown in Figure 8. The boost output current is estimated as the following equation: IIOST (A) = 2 R (kΩ ) ( A ) × IOST 3 Rcs (mΩ ) RIMC(kΩ ) = (5) (3) Battery impedance compensation setting circuit The battery impedance as shown in the table 4 according to the RIMC and Rcs: Boost output current setting circuit Figure 9 gives out boost output current with various RIOST. Table 4: Battery Impedance RIMC(KΩ) Battery Impedance R(mΩ) 3.0 VBAT = 3.7V CVout=4.5V 2.5 (4) VBAT (V ) = BAT(V ) − IBAT ( A ) × R( mΩ ) ×10-3 Figure 11. Figure 8. 25 × R (mΩ ) Rcs (m Ω ) 50 100 200 Rcs=25mΩ 50 100 200 Rcs=50mΩ 100 200 400 IOUT (A) 2.0 1.5 Boost Output Plug-in Auto Detection 1.0 Figure 12 provides a solution for auto plug-in detection. 0.5 0 0 20 40 60 80 100 120 RIOST (kΩ) Figure 9. Boost output current setting The IOST pin voltage is proportional to output current until output current is limited, as shown in Figure 10. 900 VIOST (mV) 750 VBAT = 3.7V RIOST=100kΩ Figure 12. 600 450 External Input Over Voltage Protection 300 Considering the maximum voltage rating at VIN pin, the external OVP circuit as shown in Figure 13 is recommended if input voltage may go higher than 7V. With the enhanced OVP circuit, the design can pass UN38.3. 150 0 0 Boost output auto detection circuit 0.4 0.8 1.2 1.6 2.0 2.4 2.8 Output Current(A) Figure 10. VIOST VS. output current Battery Impedance Compensation An external resistor is used to set the impedance from 40mΩ to 500mΩ as shown in Figure 11. RIMC is corresponding to battery impedance. Higher RIMC gives higher compensation voltage which is positively proportional to battery charge/discharge current. Innovative PowerTM - 13 - Figure 13. Input over voltage protection www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 Input Over Voltage Surge In the case of pure ceramic input capacitor is chosen, if the input cable is long, stray inductance may cause over voltage spikes as twice as the steady-state voltage when input source is plugged in. Below input circuit is recommended to avoid input voltage surge. R1 resistor is added in series with capacitor C1 to damp the potential LC resonance as shown in Figure 14. Figure 15. Figure 14. Battery thermal circuit Input over voltage surge protection circuit Inductor and Capacitor Selection ACT2813/ACT2813C supports SMD components. 2.2uH inductor is recommended. Input side, 4.7uF ceramic capacitor in series with 2.7Ω resistor are recommended, on battery side, 22uF ceramic capacitors is recommended while on output side, 22uFx3 ceramic capacitors are recommended. Battery Temperature Monitoring ACT2813 continuously monitors the temperature of the battery pack by sensing the resistance of its thermistor, and suspends charging if the temperature of the battery pack exceeds the safety limits. In a typical application, the TH pin is connected to the battery pack's thermistor input as shown in Figure 15. The ACT2813 injects a 60µA current out of the TH pin into the thermistor, so that the thermistor resistance is monitored by comparing the voltage at TH to the internal VTHL and VTHH thresholds of 0.3V and 1.5V, respectively. When VTH > VTHH or VTH < VTHL charging and the charge timers are suspended. When VTH returns to the normal range, charging and the charge timers resume. The threshold is given by: 60µA×RNOM×kHOT=0.3V→ RNOM×kHOT=5kΩ 60µA×RNOM×kCOLD=1.5V → RNOM×kCOLD= 25kΩ where RNOM is the nominal thermistor resistance at room temperature, and kHOT and kCOLD are the ratios of the thermistor's resistance at the desired hot and cold thresholds, respectively. Innovative PowerTM - 14 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 PC Board Layout Guidance 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 size, VIN pin, Vout pin, SW pin and the schottky diode. 2. Place input decoupling ceramic capacitor C1 and R9 as close to VIN pin as possible. Resistor R9 is added in series with capacitor C1 to damp the potential LC resonance . 3. Use copper plane for power GND for best heat dissipation and noise immunity. 4. Place CSP and CSN capacitor C7 (10nF) close to CSP and CSN pin as possible, use Kevin Sense from sense resistor R1 and R2 to CSP and CSN pins. 22uF decoupling capacitor is added close to VBAT pin. 5. Place the ceramic capacitor C2 and D1 as close to VOUT and PGND as possible, SW goes under the C2 (recommend C2 to use 1206 size). SW pad is a noisy node switching. It should be isolated away from the rest of circuit for good EMI and low noise operation. 6. RC snubber is recommended to add across SW to PGND to reduce EMI noise. A demo board PCB layout example is shown in the figure 16. Figure 16. PCB Layout Top Layer Bottom Layer Innovative PowerTM - 15 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C LED4 LED3 LED2 LED1 Rev 2, 19-May-15 Figure 17. ACT2813 typical application circuit (Fast charge current set is 2.4A, boost output constant current set is 2.66A) Innovative PowerTM - 16 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 Table 5: BOM List ITEM REFERENCE DESCRIPTION QTY MANUFACTURER 1 L1 Core, 6.5*3*3 Dip, 2.2uH, 6A, Rdson=5mΩ 1 Sunlord 2 Q1 AO4503, Rdson=19mΩ at VGS = - 4.5 V 1 AOS 3 Q2 MMBT3906 1 Vishay 4 D1 SBR3U20SA, 20V/3A Schottky MBRA210LT3G, 10V/2A Schottky 1 Diodes On-semi 5 D2 1N4148, Vf=0.7V, 75V Schottky 1 Vishay 6 C1 Ceramic capacitor, 4.7uF/10V, X7R, 0805 1 Murata/TDK 7 C2,C3,C4,C9 Ceramic capacitor, 22uF/10V, X7R, 1206 4 Murata/TDK 8 C5,C6 Ceramic capacitor, 2.2uF/10V, X7R, 0603 2 Murata/TDK 9 C7 Ceramic capacitor, 10nF/10V, X7R, 0603 1 Murata/TDK 10 C8 Ceramic capacitor, 0.1uF/10V, X7R, 0603 1 Murata/TDK 11 C10 Ceramic capacitor, 10uF/10V, X7R, 0805 1 Murata/TDK 12 C11 Ceramic capacitor, 4.7nF/10V, X7R, 0603 1 Murata/TDK 13 R1,R2 Chip Resistor, 50mΩ, 1/4W, 1%, 1206 2 Murata/TDK 14 R3,R10 Chip Resistor, 100kΩ, 1/10W, 1%, 0603 2 Murata/TDK 15 R4 Chip Resistor, 48kΩ, 1/10W, 1%, 0603 1 Murata/TDK 16 R5 Chip Resistor, 68kΩ, 1/10W, 5%, 0603 1 Murata/TDK 17 R6 Chip Resistor, 60.4kΩ, 1/10W, 1%, 0603 1 Murata/TDK 18 R7,R8,R12 Chip Resistor, 0Ω, 1/10W, 1%, 0603 3 Murata/TDK 19 R9 Chip Resistor, 2.7Ω, 1/8W, 1%, 0805 1 Murata/TDK 20 R13 Chip Resistor, 100Ω, 1/10W, 1%, 0603 1 Murata/TDK 21 R15 Chip Resistor, 715kΩ, 1/10W, 5%, 0603 1 Murata/TDK 22 R16,R19 Chip Resistor, 200kΩ, 1/10W, 5%, 0603 2 Murata/TDK 23 R17 Chip Resistor, 10kΩ, 1/10W, 5%, 0603 1 Murata/TDK 24 R18 Chip Resistor, 0.47Ω, 1/4W, 1%, 1206 1 Murata/TDK 25 R20,R22 Chip Resistor, 43.2kΩ, 1/10W, 1%, 0603 2 Murata/TDK 26 R21,R23 Chip Resistor, 49.9kΩ, 1/10W, 1%, 0603 2 Murata/TDK 27 LED1,LED2 LED3,LED4 LED, 0603, Blue 4 LED Manu 28 PB Push Button 1 LED Manu 29 USB 10.2*14.6*7mm, 4P, DIP 1 30 Micro-USB MICRO USB 5P/F SMT B 1 31 U1 IC, ACT2813, FCQFN 4x4-20 1 Innovative PowerTM - 17 - ACT www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C LED4 LED3 LED2 LED1 Rev 2, 19-May-15 Figure 18. ACT2813C typical application circuit (Fast charge current set is 2.4A, boost output constant current set is 2.66A) Innovative PowerTM - 18 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 Table 5: BOM List ITEM REFERENCE DESCRIPTION QTY MANUFACTURER 1 L1 Core, 6.5*3*3 Dip, 2.2uH, 6A, Rdson=5mΩ 1 Sunlord 2 Q1 AO4503, Rdson=19mΩ at VGS = - 4.5 V 1 AOS 3 Q2 MMBT3906 1 Vishay 4 D1 SBR3U20SA, 20V/3A Schottky MBRA210LT3G, 10V/2A Schottky 1 Diodes On-semi 5 D2 1N4148, Vf=0.7V, 75V Schottky 1 Vishay 6 C1 Ceramic capacitor, 4.7uF/10V, X7R, 0805 1 Murata/TDK 7 C2,C3,C4,C9 Ceramic capacitor, 22uF/10V, X7R, 1206 4 Murata/TDK 8 C5,C6 Ceramic capacitor, 2.2uF/10V, X7R, 0603 2 Murata/TDK 9 C7 Ceramic capacitor, 10nF/10V, X7R, 0603 1 Murata/TDK 10 C8 Ceramic capacitor, 0.1uF/10V, X7R, 0603 1 Murata/TDK 11 C10 Ceramic capacitor, 22uF/10V, X7R, 0805 1 Murata/TDK 12 C11 Ceramic capacitor, 4.7nF/10V, X7R, 0603 1 Murata/TDK 13 R1,R2 Chip Resistor, 50mΩ, 1/4W, 1%, 1206 2 Murata/TDK 14 R3,R10 Chip Resistor, 100kΩ, 1/10W, 1%, 0603 2 Murata/TDK 15 R4 Chip Resistor, 48kΩ, 1/10W, 1%, 0603 1 Murata/TDK 16 R5 Chip Resistor, 68kΩ, 1/10W, 5%, 0603 1 Murata/TDK 17 R6 Chip Resistor, 60.4kΩ, 1/10W, 1%, 0603 1 Murata/TDK 18 R7,R8,R12 Chip Resistor, 0Ω, 1/10W, 1%, 0603 3 Murata/TDK 19 R9 Chip Resistor, 2.7Ω, 1/8W, 1%, 0805 1 Murata/TDK 20 R11 Chip Resistor, 51Ω, 1/8W, 1%, 0805 1 Murata/TDK 21 R13 Chip Resistor, 100Ω, 1/10W, 1%, 0603 1 Murata/TDK 22 R15 Chip Resistor, 715kΩ, 1/10W, 5%, 0603 1 Murata/TDK 23 R16,R19 Chip Resistor, 200kΩ, 1/10W, 5%, 0603 2 Murata/TDK 24 R18 Chip Resistor, 0.47Ω, 1/4W, 1%, 1206 1 Murata/TDK 25 R20,R22 Chip Resistor, 43.2kΩ, 1/10W, 1%, 0603 2 Murata/TDK 26 R21,R23 Chip Resistor, 49.9kΩ, 1/10W, 1%, 0603 2 Murata/TDK 27 LED1,LED2 LED3,LED4 LED, 0603, Blue 4 LED Manu 28 LED5 Flashlight 1 LED Manu 29 PB Push Button 1 30 USB 10.2*14.6*7mm, 4P, DIP 1 31 Micro-USB MICRO USB 5P/F SMT B 1 32 U1 IC, ACT2813C, FCQFN 4x4-20 1 Innovative PowerTM - 19 - ACT www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Schematic as show in Figure 17, Ta = 25°C, unless otherwise specified) Battery Charge V/I Profile Weak Input Source VIN 1500 Charge Current (mA) Charge Current (mA) 2000 1000 500 ACT2813/ACT2813C-002 VIN = 5.0V ICHRG = 2.4A VOUT 3000 ACT2813/ACT2813C-001 2500 VIN = 5.0V ICHRG = 2.4A 2500 2000 1500 1000 500 0 0 4.2 4.4 4.6 4.8 5.0 5.2 0 0.5 1.0 1.5 Voltage (V) 3.5 4.0 4.5 90.5 90.0 90.0 VBAT = 3.2V Efficiency(%) VIN = 5.0V ICHRG = 2.4A ACT2813/ACT2813C-004 100.0 ACT2813/ACT2813C-003 Efficiency(%) 3.0 Boost Efficiency 91.0 89.5 VBAT = 3.7V 80.0 VBAT = 4.1V 70.0 60.0 50.0 89.0 40.0 88.5 3.0 3.2 3.4 3.6 3.8 4.0 0 4.2 500 1000 1500 2000 Battery Voltage (V) Output Current (mA) Battery Charge Current VS. Temperature Battery Leakage VS. Temperature (HZ Mode) 2500 2000 1500 Battery Leakage (uA) VIN = 5.0V VBAT = 3.5V 1000 500 0 -20 2500 ACT2813/ACT2813C-006 25.0 ACT2813/ACT2813C-005 3000 Battery Charge Current (mA) 2.5 Battery Voltage (V) Charge Efficiency 91.5 2.0 20.0 15.0 VBAT = 3.7V 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) - 20 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Schematic as show in Figure 17, Ta = 25°C, unless otherwise specified) Boost Output Voltage VS. Temperature 2600 2400 Boost Output Voltage (V) VBAT = 3.7V IOST=2.66A CV= 4.5V 2800 5.4 2200 2000 1800 VBAT = 3.5V VOUT = 5.05V 5.3 5.2 5.1 5.0 4.9 4.8 -20 0 20 40 60 80 100 120 140 -30 0 Temperature (°C) Boost Output Voltage VS. Output Current Boost Output Constant Current mA) Boost Output Voltage (V) 5.02 VBAT = 3.2V 4.94 4.9 500 1000 1500 2000 90 120 150 2500 2800 ACT2813/ACT2813C-010 5.06 0 60 Boost Output Constant Current Limit VS. VBAT ACT2813/ACT2813C-009 VBAT=4.1V 4.98 30 Temperature (°C) 5.1 2750 2700 2650 2600 2550 2500 3000 3.0 3.2 3.4 3.6 3.8 4.0 Boost Output Current (mA) Battery Voltage (V) Boost Standby Current VS. Battery Voltage Battery Leakage VS. Battery Voltage (HZ Mode) 0.53 0.51 7.0 Battery Leakage (µA) 0.55 0.49 0.47 4.2 ACT2813/ACT2813C-012 8.0 ACT2813/ACT2813C-011 057 Standby Current (mA) ACT2813/ACT2813C-008 3000 ACT2813/ACT2813C-007 Boost Output Constant Current (mA) Boost Output Constant Current Limit VS. Temperature 6.0 5.0 4.0 3.0 2.0 1.0 0 0.45 3.0 3.3 3.6 3.9 4.2 45 0 4.8 2.0 3.0 4.0 5.0 Battery Voltage (V) Battery Voltage (V) Innovative PowerTM 1.0 - 21 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Schematic as show in Figure 17, Ta = 25°C, unless otherwise specified) Boost Load Transient (80mA-1A-80mA) Boost Load Transient (1A-2.4A-1A) CH1 ACT2813/ACT2813C-014 ACT2813/ACT2813C-013 VBAT = 3.7V VOUT = 5.0V IIOST = 2.66A VBAT = 4.2V 3.7V V BAT = VOUT = 5.0V 5.0V V OUT = = 1.3A 2.66A IIIOST IOST = CH1 CH2 CH2 CH1: VOUT, 200mV/div CH2: IOUT, 1A/div TIME: 400µs/div CH1: VOUT, 100mV/div CH2: IOUT, 1A/div TIME: 400µs/div SW and Output Waveforms in Boost Mode SW and Output Waveforms in Boost Mode CH1 CH2 VBAT = 4.1V VOUT = 5.0V IOUT = 2.4A CH1 ACT2813/ACT2813C-016 ACT2813/ACT2813C-015 3.4V BAT ==3.4V VVBAT 5.0V OUT ==5.0V VVOUT I = 1.0A OUT IOUT = 2.4A CH2 CH1: VOUT, 20mV/div CH2: VSW, 2V/div TIME: 1µs/div CH1: VOUT, 20mV/div CH2: VSW, 2V/div TIME: 1µs/div Transition Between Buck Mode and Boost Mode VIN = 5.0V VBAT = 4.1V VIN = 5.0V VBAT = 4.1V VIN VnPG CH2 ACT2813/ACT2813C-017 CH1 CH3 Vout CH1: VIN, 5V/div CH2: VnPG, 5V/div CH3: vout, 2V/div TIME: 1s/div Innovative PowerTM - 22 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT2813/ACT2813C Rev 2, 19-May-15 PACKAGE OUTLINE FCQFN 4x4-20 PACKAGE OUTLINE AND DIMENSIONS SYMBOL DIMENSION IN MILLIMETERS DIMENSION IN INCHES MIN MAX MIN MAX A 0.800 0.900 0.031 0.035 A1 —- 0.050 —- 0.002 A3 0.203 REF 0.008 REF b 0.200 0.300 0.008 0.012 D 3.950 4.050 0.156 0.159 D1 1.550 1.650 0.061 0.065 D2 0.750 0.850 0.030 0.033 e 0.500 BSC 0.020 BSC E 3.950 4.050 0.156 0.159 E1 1.450 1.550 0.057 0.061 E2 0.950 1.050 0.037 0.041 L1 0.450 0.550 0.018 0.022 L2 0.950 1.050 0.037 0.041 L3 1.050 1.150 0.041 0.045 L4 1.200 1.300 0.047 0.051 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 - 23 - www.active-semi.com Copyright © 2015 Active-Semi, Inc.