ADI’s ADP5065 is a built-in FET device that interconnects the DC voltage charging output end and the battery end. The battery can be isolated through the FET. When the system driving power comes from a dead battery or no battery, the system will immediately switch to USB power supply mode. The ADP5065 has an input voltage range of 4V to 5.5V with a maximum input voltage of up to 20V. The ADP5065 charger is compatible with USB2.0, USB3.0, and USB Battery Charging Specification 1.1. This article summarizes the characteristics of the ADP5065 device, introduces the device, characteristics, application direction and internal structure block diagram, and gives the reference design example schematic diagram, board diagram and component list.
The ADP5065 charger is fully compliant with the USB 2.0, USB 3.0, and USB Battery Charging Specification 1.1 and enables charging via the mini USB VBUS pin from a wall charger, car charger, or USB host port.
The ADP5065 operates from a 4 V to 5.5 V input voltage range but is tolerant of voltages of up to 20 V. This alleviates the concerns about the USB bus spiking during disconnect or connect scenarios.
The ADP5065 also features an internal FET between the dc-to-dc charger output and the battery. This permits battery isolation and, hence, system powering under a dead battery or no battery scenario, which allows for immediate system function on connection to a USB power supply.
Based on the type of USB source, which is detected by an external USB detection chip, the ADP5065 can be set to apply the correct current limit for optimal charging and USB compliance.
The ADP5065 comes in a very small and low profile 20-lead WLCSP (0.5 mm pitch spacing) package.
ADP5065 main features:
3MHz switch mode charger
1.25 A charge current from dedicated charger
Up to 680 mA charging current from 500 mA USB host
Operating input voltage from 4.0 V up to 5.5 V
Tolerant input voltage −0.5 V to +20 V (USB VBUS)
Dead battery isolation FET between battery and charger output
Battery thermistor input with automatic charger shutdown for when battery temperature exceeds limits
Compliant with the JEITA Li-Ion battery charging temperature specification
SYS_EN_OK flag to hold off system turn-on until battery is at minimum required level for guaranteed
system startup due to minimum battery voltage and/or minimum battery charge level requirements
EOC programming with C/20, C/10 and specific current level selection
Digital still cameras
Digital video cameras
Single cell Li-Ion portable equipment
PDA, audio, GPS devices
Figure 1. ADP5065 Block Diagram
ADP5065 design schematic diagram:
Figure 2. ADP5065 Design Schematic
ADP5065 Design Proposal Bill of Materials:
PCB component layout:
The Links: NL6448BC33-63C DD110F-160