The LT4294HDD#PBF from Linear Technology is an IEEE 802.3bt powered device interface controller in 10 pin DFN package. This is an IEEE 802.3af/at/bt (draft 2.3) compliant powered device (PD) interface controller. The active low T2P output indicates the number of classification events received during IEEE 802.3bt-compliant mutual identification and negotiation of available power. The LT4294 utilizes an external, low RDS (ON) N-channel hot swap MOSFET and supports the LT4320/LT4321 ideal diode bridges to extend the end to end power delivery efficiency and eliminate costly heat sinks. The LT4294 also includes a power good output, on-board signature resistor, undervoltage lockout and thermal protection. Start-up inrush current is adjustable with an external capacitor. Auxiliary power override is supported as low as 9V with the AUX pin. It is typically used in high power wireless data systems, outdoor security camera equipment, commercial and public information displays.
- Operating input voltage of 60V, supply current of 2mA (VVPORT = VHSSRC = 57V)
- Configured to support possible 802.3bt, 802.3at, 802.3af power levels with external component change
- 5-event classification sensing, supports up to 71W PDs
- Superior surge protection (100V absolute maximum)
- Operating temperature range from -40°C to 125°C
- Duty cycle of 50% (after 4-event classification)
- Frequency of 840Hz
- External hot swap N-channel MOSFET for lowest power dissipation and highest system efficiency
- Configurable aux power support as low as 9V, pin compatible with LT4275A/B/C
- Easy migration between LTPoE++? PDs and IEEE 802.3bt PDs
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