TPS23755: 802.3at Type2 POE+ 25.5W

Hi Jeff,

Thanks for reaching out.

For 25.5W 802.3at Type2 PD, we have following recommendations:

1. TPS23731/4 (PD + PWM controller), newest: 

• Compliance to IEEE 802.3bt and 802.3at
• 0.3-Ohm typ. hotswap
• TPS23731 supports flyback; TPS23734 supports flyback/ACF (both have internal error amplifier, can be configured to low side SW Buck converter)
• Support primary side regulation (no need for OPTO feedback)
• Support auto maintain power signature
• Programmable frequency dithering for EMI
• Support soft-stop
• Support adapter priority
• VSON45 (7mm x 5mm)

2. TPS23754/6 (PD + PWM controller):

• Compliance to IEEE 802.3at
• 0.5-Ohm typ. hotswap
• TPS23754 has 15-V Vc UVLO; TPS23756 has 9-V Vc UVLO(used for low-voltage DC adapter case).
• Both support flyback/ACF-active clamping forward (no internal error amplifier for both)
• Support adapter priority & low voltage PD input
• HTSSOP20 (6.5mm x 4.4mm)

3. TPS23751/2 (PD + PWM controller):

• Compliance to IEEE 802.3at
• 0.5-Ohm typ. hotswap
• Flyback with secondary side regulation only (no internal error amplifier)
• Sleep mode (disable DC/DC, TPS23752 only) and high efficiency light load mode (automatically reduce switching frequency at light load)
• Support adapter priority
• TPS23751: TSSOP16 (5mm x 4.4mm)
• TPS23752: TSSOP20 (6.5mm x 4.4mm)

4. TPS2378/9 (PD only):

• Compliance to IEEE 802.3at
• 0.5-Ohm typ. hotswap
• TPS2378 has adapter higher priority, TPS2379 has gate pin to drive an external hotswap
• HSOP8 (4.89mm x 3.9mm)

Please let me know for any questions.

Best regards,

Zhining