Datasheet

TPS23751
TPS23752
SLVSB97C –JULY 2012–REVISED JANUARY 2014 www.ti.com
PoE INTERFACE SECTION
Unless otherwise noted, V
VC
= V
APD
= V
CS
= V
ARTN
= V
RTN
.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
DEN (DETECTION AND ENABLE)
DEN open, I
VDD
+ I
DEN
+ I
RTN
, V
VDD
= 10.1 V, not in
Bias current 3 5 12 µA
mark
DEN leakage current V
DEN
= V
VDD
= 57 V 0.1 5 µA
I
VDD
+ I
DEN
+ I
RTN
, V
VDD
= 1.4 V 53.8 56.5 58.3
Detection current µA
I
VDD
+ I
DEN
+ I
RTN
, V
VDD
= 10.1 V 395 410 417
Disable threshold DEN falling 3 3.6 5 V
V
PD_DIS
Hysteresis 50 113 200 mV
CLS (CLASSIFICATION)
13 V ≤ V
VDD
≤ 21 V, Measure I
VDD
+ I
DEN
+ I
RTN
R
CLS
= 1270 Ω 1.80 2.17 2.60
R
CLS
= 243 Ω 9.90 10.60 11.20
I
CLS
Classification current mA
R
CLS
= 137 Ω 17.60 18.60 19.40
R
CLS
= 90.9 Ω 26.50 27.90 29.30
R
CLS
= 63.4 Ω 38.00 39.90 42.00
V
VDD
rising, V
CLS
↑ 11.9 12.5 13
V
CL_ON
Class lower threshold V
V
CL_H
Hysteresis 1.4 1.6 1.7
V
VDD
rising, V
CLS
↓ 21 22 23
V
CU_OFF
Class upper threshold V
V
CU_H
Hysteresis 0.50 0.75 0.90
V
MSR
Mark reset threshold V
VDD
falling 3 3.9 5 V
Mark state resistance 2-point measurement at 5 V and 10.1 V 6 9.1 12 kΩ
Leakage current V
VDD
= 57 V, V
CLS
= 0 V, measure I
CLS
1 µA
RTN (PASS DEVICE)
r
DS(on)
On resistance V
VC
= V
APD
= V
ARTN
= V
CS
= V
VDD
0.20 0.45 0.75 Ω
V
VC
= V
APD
= V
ARTN
= V
CS
= V
VDD
, V
RTN
=1.5 V,
Current limit 0.85 1.00 1.20 A
Measure I
RTN
V
VC
= V
APD
= V
ARTN
= V
CS
= V
DD
, V
RTN
= 2 V, V
DD
=
Inrush current 100 140 180 mA
20 V → 48 V
Inrush termination Percentage of inrush current 80% 90% 99%
Foldback threshold V
RTN
↑ 11.0 12.3 13.6 V
V
RTN
rising to when current limit changes to inrush
Foldback deglitch time 500 800 1500 µs
current limit
Input bias current V
VDD
= V
RTN
= 30 V, Measure I
RTN
30 µA
RTN leakage current V
RTN
= V
VDD
= 100 V, V
DEN
= V
VSS
50 µA
T2P (TYPE 2 PSE INDICATION)
I
T2P
= 2 mA, after 2-event classification and softstart
is complete,
V
T2P
Output low voltage 0.26 0.60 V
V
VC
= 12 V, V
CTL
= 3 V, V
ARTN
= V
VSS
V
CTL
= 3 V, V
APD
= 2 V, Measure from switching start
t
T2P
T2P startup delay 2 4.3 7 ms
to V
T2P
↓
Leakage current V
T2P
= 18 V, V
ARTN
= V
VSS
10 µA
PoE – PD UVLO
UVLO rising threshold 36.3 38.1 40
V
UVLO_R
V
UVLO falling threshold 30.5 32.0 33.6
SUPPLY CURRENT
Operating current Measure I
VDD
, V
VDD
= 48 V, 40 V ≤ V
VDD
≤ 57 V 210 500 µA
Off-state current ARTN and V
VC
open, V
VDD
= 30 V, Measure I
VDD
300 µA
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