This reference design demonstrates two methods that connect two TPS61288 devices in parallel to support high-output power. One method is to connect the VIN, VOUT, FB and COMP pins together directly. Because the two devices share the same voltage on the COMP pin, the inductor peak current of the two devices is closed at the typical condition. However, considering the process variation at the worst condition, the output current of one device can only be 50% of the other device. Thus, the maximum average power of this method is approximately 30 W from 3.3-V to 4.2-V input, but the peak output power can be 60 W for dozens of milliseconds.
- Input voltage of 3.3 V to 4.2 V
- Output voltage of 12 V
- Output current of 5 A
- Two boost converters in parallel
- Output power of 60 W