TPS2373 Texas instruments

TPS2373

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TPS2373

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Описание

The TPS2373 contains all of the features needed to implement an IEEE802.3at or IEEE802.3bt (draft) (Type 1-4) powered device (PD). The low internal switch resistance allows the TPS2373-4 and TPS2373-3 to support high power applications up to 90 W and 60 W respectively. Assuming 100-meter CAT5 cable, this translates into 71.3 W and 51 W at PD input.The TPS2373 operates with enhanced features. The Advanced Startup function for DC-DC results in a simple, flexible, and minimal system cost solution, while ensuring that IEEE802.3bt (draft) startup requirements are met. It helps to reduce the size of the low voltage bias capacitor considerably. It also allows long DC-DC converter soft-start period and enables the use of a low-voltage PWM controller.The Automatic MPS function enables applications requiring very low power standby modes. The TPS2373 automatically generates the necessary pulsed current to maintain the PSE power. An external resistor is used to enable this functionality and to program the MPS pulsed current amplitude.

IEEE 802.3bt (Draft) PD Solution for Type 3 or Type 4 PoE
Supports Power Levels for Type-4 ( TPS2373-4) 90-W and Type-3 ( TPS2373-3) 60-W Operation
Robust 100 V Hotswap MOSFET
- TPS2373-4 (typ.): 0.1-Ω, 2.2-A Current Limit
- TPS2373-3 (typ.): 0.3-Ω, 1.85-A Current Limit
Allocated Power Indicator Outputs
Advanced Startup for DC-DC
- Simplifies Downstream DC-DC Design
- Compliant to PSE Inrush
Automatic Maintain Power Signature (MPS)
- Auto-adjust MPS for Type 1-2 or 3-4 PSE
- Supports Ultra-Low Power Standby Modes
Primary Adapter Priority Input
Supports PoE++ PSE
-40°C to 125°C Junction Temperature Range
20-lead VQFN Package

Vin (min) (V)	8
Vin (max) (V)	57
PoE current limit (min) (mA)	1550, 1900
PoE inrush limit (mA) (typ)	200, 335
rDS(on) per FET (typ) (mΩ)	100, 300
PoE standards supported	802.3bt Type 3, 802.3bt Type 4
PD power level	13W, 25W, 51W, 71W
DC/DC control	PD Only
Fault response	Auto Retry
Features	Adapter priority, Advanced startup, Automatic MPS, Non-standard POE++ compatible, PG, Primary Side Adapter Priority, Programmable UVLO, Thermal shutdown
Operating temperature range (°C)	-40 to 125
Rating	Catalog