MAX5974AETE+T

The MAX5974AETE+T from Analog Devices Inc./Maxim Integrated is an active-clamped, current-mode PWM controller specifically designed for Power-over-Ethernet (PoE) powered device (PD) applications. It supports wide-input-voltage ranges and features like frequency foldback for light-load efficiency and programmable dead time for zero-voltage switching (ZVS).

Key electrical specifications include a programmable switching frequency from 100kHz to 600kHz with ±8% accuracy, and a programmable feed-forward maximum duty-cycle clamp set at 80%. It also features a typical startup supply current of 100μA and fast cycle-by-cycle peak current limit with a typical propagation delay of 35ns. The device includes 115ns current-sense internal leading-edge blanking.

This controller is available in a 16-pin TQFN-EP package, designed for surface mount applications. It operates within a temperature range of -40°C to +125°C, making it suitable for various environmental conditions. The MAX5974A/B variants offer regulation without an optocoupler, while the MAX5974C/D use traditional optocoupler feedback.

Applications include IEEE 802.3af/at compliant PoE PDs, high-power PDs beyond standard specifications, active-clamped forward DC-DC converters, IP phones, wireless access nodes, and security cameras.