RK8009 or LTC3780-based converter

In brief: Based on review measurements: Test current: RK8009 (9 A vs. 8); Ripple: RK8009 (50 mV vs. 160).

Model	RK8009Riden · 2026Read review →	LTC3780-based converterLinear Technology · 2016Read review →
Test current, A	9	8
Under load, V	81	12
Ripple, mV	50	160
Review conclusion	Recommended	With reservations

Only in one review: Voltage 80 V (RK8009); Current 9 A (RK8009); Power 720 W (RK8009); Efficiency 98.9 % (RK8009).

RK8009: The converter showed low ripple, high efficiency and good thermal performance; its main drawback is limited input-voltage headroom.

LTC3780-based converter: An interesting, powerful buck-boost converter, but it falls short of its ratings and needs improved cooling.

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.

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