ACT2802 Rev 0, 06-Nov-13 Product Brief 5V/2.5A Backup Battery Pack Manager FEATURES Dedicated Single Chip Solution for Mobile APPLICATIONS Power With Minimal Component Count 5V/2.5A Constant Output Current Limit in Boost Mode 2.5A Switching Charger Current Limit Programmable 4.1V to 4.35V Battery Voltage 95% Boost Efficiency (Vbat=4.1V) Adaptive to 10mA-2400mA Input Sources Battery Disconnection at Output Short <10µA Low Battery Leakage Current at HZ Backup Battery Pack Power Bank Mobile Power Standalone Battery Charger with USB Output GENERAL DESCRIPTION ACT2802 is a space-saving and high-performance low-profile single-chip solution for backup battery pack and standalone battery charger. ACT2802 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 Up to 3.0A Input Current Limit with Prioritized Power Path to Output 5V+/-100mV Output Voltage in Boost Mode 1.1MHz/0.55MHz Switching Frequencies 2.2uH Inductor and Low Profile Ceramic Capacitors 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 QFN4x4-24 Package ACT2802 operates at 1.1MHz for switching charger and 0.55MHz for boost converter allowing tiny external inductor and capacitors. ACT2802 provides a direct power path from input to output with programmable current limit while providing power to switching charger. Output has higher priority than battery charger if the programmed input current limit is reached. ACT2802 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. ACT2802 boost converter steps battery voltage up to 5V. Boost converter features high efficiency, constant current regulation, short circuit protection and over voltage protection. ACT2802 provides 3.5mA constant currents to drive 4 LEDs to indicate battery level and charge status. 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 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 Output Current (A) Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. -1- www.active-semi.com Copyright © 2013 Active-Semi, Inc. ACT2802 Rev 0, 06-Nov-13 Product Brief ORDERING INFORMATION PART NUMBER BOOST SWITCH FREQUENCY OUTPUT CHARGE CURRENT PACKAGE PACKING ACT2802QL-T 0.55MHz 5V/2.5A 2.5A QFN44-24 TAPE & REEL, 3KU/REEL PIN CONFIGURATION TOP VIEW 24 23 22 21 20 19 HZ PB 1 18 2 17 AGND nPG ILIM VIN 3 16 4 15 5 14 EP 6 7 8 9 10 13 11 LED1 BTV ICST IOST CSN CSP 12 QFN44-24 Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. -2- www.active-semi.com Copyright © 2013 Active-Semi, Inc. ACT2802 Rev 0, 06-Nov-13 Product Brief PIN DESCRIPTIONS PIN NAME DESCRIPTION 1 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. 2 PB Push button input, connect a push button from this pin to AGND, internally pulled up by a 3MΩ resistor to battery. When this pin is pushed for 100ms, LED1-4 indicators are enable for 5 seconds. PB starts up boost converter if HZ pin is grounded and VIN is not present. 3 AGND 4 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. 5 ILIM Input current limit setting pin. Connect a resistor from this pin to AGND to set the input current limit. The current setting ranges from 1.0A-3.0A. 6 VIN USB or AC adaptor input. When VIN is valid, charge and power path is enabled. 7, 8 VOUT 9, 10 SW 11 PGND Power ground. PGND is connected to the source of low-side N-channel MOSFET and the MOSFET’s gate driver. 12 BAT Battery 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. 13 CSP Positive terminal of charge current sense input. Kevin sense is required with 10nF ceramic capacitor right across CSP and CSN pins. 14 CSN Negative terminal of charge current sense input. 15 IOST Output current setting. Connect a resistor from this pin to AGND to set output constant current. The current setting ranges from 1.0A-2.5A. 16 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-2.5A. 17 BTV Battery termination voltage setting. Connect a resistor from this pin to AGND to program battery charge termination voltage. 18 LED1 Battery level indicator. An internal 3.5mA sink current limit is built in. 19 LED2 Battery level indicator. An internal 3.5mA sink current limit is built in. 20 LED3 Battery level indicator. An internal 3.5mA sink current limit is built in. 21 LED4 Battery level indicator. An internal 3.5mA sink current limit is built in. 22 RIMC Battery impendence compensation input. Connect to a resistor from this pin to APNG to program the battery impedance. 23 BLVS Battery level voltage shift. Connect a resistor from this pin to AGND to shift the battery LED indication thresholds. 24 TH Temperature sensing input. Connect to battery thermistor terminal. If no use, put 10K pulled down resistor. 25 EP Exposed pad. Must be soldered to ground on the PCB. Logic Ground. Output pin. Bypass to PGND with a high quality low ESR and ESL ceramic capacitor placed as close to the IC as possible. Internal switch to output inductor terminal. Innovative PowerTM ActiveSwitcherTM is a trademark of Active-Semi. -3- www.active-semi.com Copyright © 2013 Active-Semi, Inc. ACT2802 Rev 0, 06-Nov-13 Product Brief ABSOLUTE MAXIMUM RATINGS 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.) : 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 ActiveSwitcherTM is a trademark of Active-Semi. -4- www.active-semi.com Copyright © 2013 Active-Semi, Inc. ACT2802 Rev 0, 06-Nov-13 Product Brief PACKAGE OUTLINE QFN44-24 PACKAGE OUTLINE AND DIMENSIONS SYMBOL DIMENSION IN MILLIMETERS DIMENSION IN INCHES MIN MAX MIN MAX A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.200 REF 0.008 REF b 0.180 0.300 0.007 0.012 D 3.850 4.150 0.152 0.163 E 3.850 4.150 0.152 0.163 D2 2.500 2.800 0.098 0.110 E2 2.500 2.800 0.098 0.110 e L R K 0.500 BSC 0.350 0.450 0.200 TYP 0.200 --- 0.020 BSC 0.014 0.018 0.008 TYP 0.008 --- 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 ActiveSwitcherTM is a trademark of Active-Semi. -5- www.active-semi.com Copyright © 2013 Active-Semi, Inc.