Comparison · Converters

FR9888 or Large Step-Up board modified into a SEPIC

Two models side by side: measurements taken by the author in their reviews, and their conclusions. The better value in each row is highlighted.

In brief: Based on review measurements: Test current: FR9888 (4.5 A vs. 2); Price: Large Step-Up board modified into a SEPIC (0.6 $ vs. 1.67).

Model	FR98882016Read review →	Large Step-Up board modified into a SEPIC2015Read review →
Voltage, V	20	28
Current, A	3.5	2
Test current, A	4.5	2
Price, $	1.67	0.6
Review conclusion	With reservations	Recommended

Only in one review: In test 3.3 W (Large Step-Up board modified into a SEPIC); Under load 3 V (Large Step-Up board modified into a SEPIC); Efficiency 89.7 % (FR9888); Temperature rise 70 °C (Large Step-Up board modified into a SEPIC).

FR9888: Usable up to 2.5 A, but efficiency is below the claim and proper heat dissipation is important.

Large Step-Up board modified into a SEPIC: After modification, the board works stably and delivers up to 700 mA at 3.3 V from a lithium cell.

Figures were taken from the review text and checked against the quoted passages. Measurement conditions differ between reviews, so read the reviews yourself before buying. Prices at the time of review.