PD70224 IdealBridge Dual MOSFET-Based Bridge Rectifier Introduction PD70224 is a dual pack of MOSFET-based full-bridge rectifiers. It contains low-RDS 0.16 N-channel MOSFETs for much higher overall efficiency and higher output power, particularly when used in Powered Devices for Power over Ethernet (PoE) applications. The entire drive circuitry for driving the MOSFETs is on-chip, including a charge pump for driving the high-side N-channel MOSFETs. The total forward drop (bridge offset) introduced by the IdealBridge rectifier is only 192 mV at 0.6A, compared to a standard bridge rectifier that typically presents 2000 mV of forward drop. PD70224 IdealBridge can support over 2A current, making it the ideal choice for IEEE 802.3bt (Type 3 and Type 4), IEEE 802.3at and IEEE 802.3af (Type 1 and Type 2). The PD70224 also supports legacy 4 pair standards such as UPoE (60W) and POH (Power over HDBase-T, 95W). In addition, PD70224 is capable of helping to identify at the physical layer itself whether a 2-pair PSE or a 4-pair PSE is providing power over the cable. It does that by sensing the voltage on the line (un-rectified) side of the pairs. Features Active circuit with low forward-drop to replace dissipative passive diode bridges Self-contained drive circuitry for MOSFETs Designed to support IEEE 802.3af/at/bt, Universal PoE (UPOE), and Power over HDBase-T (PoH) Integrated 0.16 N-Channel MOSFETs for 0.32 total path resistance Power present indicator signals for identifying 4-pair bridge power Dedicated pin to implement adapter priority Low leakage, <10 A during detection Wide operating voltage range up to 57V 40C to 85C ambient Available in 40-pin package MSL3, RoHS compliant Datasheet DS00003575D-page 1 2021 Microchip Technology Inc. and its subsidiaries PD70224 The following table lists the Microchip PD products offerings. Table 1. Microchip Powered Device Products Offerings Part Type Package IEEE IEEE HDBaseT UPoE 802.3af 802.3at (PoH) PD70100 Front end 3 mm 4 mm 12L DFN x PD70101 Front end + PWM 5 mm 5 mm 32L QFN x PD70200 Front end 3 mm 4 mm 12L DFN x x PD70201 Front end + PWM 5 mm 5 mm 32L QFN x x PD70210 Front end 4 mm 5 mm 16L DFN x x x x PD70210A Front end 4 mm 5 mm 16L DFN x x x x PD70210AL Front end 5 mm 7 mm 38L QFN x x x x PD70211 Front end + PWM 6 mm 6 mm 36L QFN x x x x PD70224 Ideal diode bridge 6 mm 8 mm 40L QFN x x x x DS00003575D-page 2 Datasheet 2021 Microchip Technology Inc. and its subsidiaries