Datasheet
TPS23754
TPS23754-1
TPS23756
www.ti.com
SLVS885G –OCTOBER 2008–REVISED OCTOBER 2013
ELECTRICAL CHARACTERISTICS – PoE AND CONTROL
[V
DD
= V
DD1
] or [V
DD1
= RTN], V
C
= RTN, COM = RTN = ARTN, all voltages referred to V
SS
unless otherwise noted
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
DETECTION (DEN) (VDD = VDD1 = RTN = V
SUPPLY
positive)
Measure I
SUPPLY
Detection current V
DD
= 1.6 V 62 64.3 66.5
μA
V
DD
= 10 V 399 406 414
V
DD
= 10 V, float DEN, measure I
SUPPLY
,
Detection bias current 5.6 10 μA
Note: Not during Mark state
V
PD_DIS
Hotswap disable threshold 3 4 5 V
DEN leakage current V
DEN
= V
DD
= 57 V, float V
DD1
and RTN, measure I
DEN
0.1 5 μA
CLASSIFICATION (CLS) (V
DD
= V
DD1
= RTN = V
SUPPLY
positive)
13 V ≤ V
DD
≤ 21 V, Measure I
SUPPLY
R
CLS
= 1270 Ω 1.8 2.1 2.4
R
CLS
= 243 Ω 9.9 10.4 10.9
Classification current,
I
CLS
mA
applies to both cycles
R
CLS
= 137 Ω 17.6 18.5 19.4
R
CLS
= 90.9 Ω 26.5 27.7 29.3
R
CLS
= 63.4 Ω 38.0 39.7 42
Classification mark resistance 5.6 V ≤ V
DD
≤ 9.4 V 7.5 9.7 12 kΩ
V
CL_ON
Regulator turns on, V
DD
rising 11.2 11.9 12.6
Classification regulator lower
V
threshold
V
CL_H
Hysteresis
(1)
1.55 1.65 1.75
V
CU_OFF
Regulator turns off, V
DD
rising 21 22 23
Classification regulator upper
V
threshold
V
CU_H
Hysteresis
(1)
0.5 0.75 1.0
V
MSR
Mark state reset V
DD
falling 3 4 5 V
Leakage current V
DD
= 57 V, V
CLS
= 0 V, DEN = V
SS
, measure I
CLS
1 μA
PASS DEVICE (RTN) (V
DD1
= RTN)
On resistance 0.25 0.43 0.75 Ω
Current limit V
RTN
= 1.5 V, V
DD
= 48 V, pulsed measurement 850 970 1100 mA
Inrush limit V
RTN
= 2 V, V
DD
: 0 V → 48 V, pulsed measurement 100 140 180 mA
Foldback voltage threshold V
DD
rising 11 12.3 13.6 V
UVLO
V
UVLO_R
V
DD
rising 33.9 35 36.1
UVLO threshold V
V
UVLO_H
Hysteresis
(1)
4.4 4.55 4.76
T2P
Perform classification algorithm, V
T2P-RTN
= 1 V,
ON characteristic 2 mA
CTL = ARTN
Leakage current V
T2P
= 18 V, CTL = V
B
10 μA
t
T2P
Delay From start of switching to T2P active 5 9 15 ms
THERMAL SHUTDOWN
Turnoff temperature T
J
rising 135 145 155 °C
Hysteresis
(2)
20 °C
(1) The hysteresis tolerance tracks the rising threshold for a given device.
(2) These parameters are provided for reference only, and do not constitute part of TI's published specifications for purposes of TI's product
warranty.
Copyright © 2008–2013, Texas Instruments Incorporated Submit Documentation Feedback 5