ACT2802 from ACT280x Family of high-performance, low-profile ICs enables Industry's smallest size solutions for backup battery pack and standalone battery chargers. Each solution can be implemented without out the need for additional ICs other than a single ACT280x.

ACT2802 can enable 5V/2.1A and 5V/1A+1A Power Bank solutions and can support input current of up to 2.1A and an output current of up to 2.1A.

ACT280x Family integrates all the functions that a backup battery pack needs, including switching charger, boost converter and LED indication. ACT280x Family also includes an input to obtain user feedback (for example, via a push button), to support various user-interface functions such as turn on/off charging and query charging status. The IC supports LED indication to display charging level on 4 LEDs.

ACT2802 operates at 2.2MHz/1.1MHz for switching charger and 1.1MHz/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.

ACT280x Family 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. ACT280x Family boost converter steps battery voltage upto 5V. Boost converter features high efficiency, constant current regulation, short circuit protection and over voltage protection.

ACT280x Family provides 3.5mA constant currents to drive 4 LEDs to indicate battery level and charge status. Battery impedance is compensated for battery level indication.

Key Features & Benefits

  • Dedicated Single Chip Solution for Mobile Power with Minimal Component Count
  • High Charge & Discharge Efficiency, 95% Boost Efficiency (Vbat = 4.1V)
  • <10μA Low Battery Leakage Current in Hi-Z Mode during Storage
  • Programmable Input Current Limit to up to 2A
  • Programmable Constant Output Current in Boost Mode to up to 5V/1.5A
  • No Load Shutdown and Push Button Turn-on
  • Sophisticated Battery Protection for Over Current (OCP), Over Voltage (OVP), Over Temperature (OTP) and Short Circuit Protections (SCP). Battery Disconnection at Output Short

Block Diagram

ACT2802 Pin Diagram

Figure below is the block diagram for ACT280x showing the architecture for charging the battery and providing system supply. The advantages of ACT280x architecture and design versus the conventional one shown above are as follows.

  • Requires minimum component count and PCB size
  • High-efficiency, integrated solution with Boost, Buck, Battery charge management and LED indication
  • Sophisticated battery protection for Over-temp, Over-voltages, Over-current and Short-circuit protection

Active-Semi's ACT280x Architecture for Power Bank Applications

Figure below is the conventional architecture used in battery charging applications. This architecture typically has multiple ICs including MCU and battery power management ICs. Some of the disadvantages of this approach are as follows.

  • Low-efficiecncy in linear charger
  • Architecture results in larger PCB and solution size
  • Needs additional Battery protection board

Conventional architecture used in Power Bank Charger ICs

Typical Application Diagram

ACT2801 EVK Block Diagram

Evaluation Kit

The high-level of integration included in ACT280x ICs enable Industrys smallest design of battery chargers and mobile chargers such as Power Bank. Below is the comparison of Active-Semis ACT2801 EVK for Power Bank application (on the left) versus a PCB found in an off-the-shelf commercial product. The smaller PCB size and smaller component size enables smaller PCB design and associated costs. On the other hand, the smaller PCB can also enable the use of larger battery pack to store more energy within the power bank product.

ACT2802 EVK for Power Bank Application

Ordering Info








0.55 MHz





Supported Applications

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