TPS2372 Datasheet, PDF (1/43 Pages) Texas Instruments – High-Power PoE PD Interface with Automatic MPS and Autoclass

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TPS2372
SLUSCM4 – OCTOBER 2017
TPS2372 High-Power PoE PD Interface with Automatic MPS and Autoclass
1 Features
•1 IEEE 802.3bt (Draft) PD Solution for Type 3 or
Type 4 PoE
• Supports Power Levels for Type-4 ( TPS2372-4)
90-W and Type-3 ( TPS2372-3) 60-W Operation
• Robust 100 V Hotswap MOSFET
– TPS2372-4 (typ.): 0.1-Ω, 2.2-A Current Limit
– TPS2372-3 (typ.): 0.3-Ω, 1.8-A Current Limit
• Allocated Power Indicator Outputs
• PG Output with Inrush Completion Delay
– 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
• Supports Autoclass Operation
• Supports PoE++ PSE
• -40°C to 125°C Junction Temperature Range
• 20-lead VQFN Package
2 Applications
• IEEE 802.3bt (Draft) Compliant Devices
• Lighting
• Power Modules
• Dual Signature PD/Forced UPOE
• 4PPOE
• Pass-through System
• Security Cameras
• Multiband access points
• Pico-base Stations
3 Description
The TPS2372 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 TPS2372-4 and
TPS2372-3 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 TPS2372 operates with enhanced features.
The Automatic MPS function enables applications
requiring very low power standby modes. The
TPS2372 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.
The TPS2372 also implements a delay function to
allow the remote PSE to complete its inrush phase
before releasing the Power Good (PG) output. This
ensures that the IEEE802.3bt (draft) startup
requirements are met.
The Autoclass enable input also allows advanced
system power optimization modes compliant with
IEEE802.3bt (draft) standard.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS2372
VQFN (20)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
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Simplified Schematic
0.1 F
RDET
58V
TPS2372
VDD
DEN
IRSHDL_EN
CLSA
CLSB
RTN
+
CBULK
I_in
PG
VSS
MPS
Control
RMPS
RREF
RMPS_DUTY
AUTCLS
AMPS_CTL
REF
MPS_DUTY
TPH
TPL
BT
MPS pulses
I_in
Low Pwr
SS _{DC/DC OUT}
VCC
MCU
+
PHY
Light Level/
Sleep/Wake
control
IN
OUT+
OUT-
LED Lighting
Control
LEDs
MPS pulses automatically generated if I_in is too low
1
Sensor
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.