LTC4268IDKD-1#TRPBF Linear Technology, LTC4268IDKD-1#TRPBF Datasheet - Page 3

• Manufacturer Part Number: LTC4268IDKD-1#TRPBF
• Description: IC PD HIGH POWER W/CNTRL 32-DFN
• Manufacturer: Linear Technology
• Type: Power over Ethernet Switch (PoE)r

Specifications of LTC4268IDKD-1#TRPBF

• Applications: Remote Peripherals (Industrial Controls, Cameras, Data Access)
• Internal Switch(s): Yes
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-WFDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
R
SYMBOL
V
V
V
V
V
I
I
V
I
g
I
V
%V
A
I
I
V
V
V
V
V
V
V
t
t
t
t
V
ΔV
V
V
V
VCC
VCC_START
FB_BIAS
FB
SFST
SFST
PG_RISE
SG_RISE
PG_FALL
SG_FALL
PORT
TURNON
TURNOFF
HYST
CLAMP
FB
m
FBCLAMP
V
CMP_THLD
PG_HIGH
SG_HIGH
PG_LOW
SG_LOW
PG_SHDN
SG_SHDN
SENSE_LIM
SENSE_OC
IH_SHDN
IL_SHDN
PGDLY
SENSE
REF
,
,
,
/ΔV
= 27.4k, R
,
,
CMP
ENDLY
PARAMETER
Supply Voltage
IEEE 802.3af System
V
V
V
V
V
V
Feedback Regulation Voltage
Feedback Pin Input Bias Current
Feedback Amplifi er
Transconductance
Feedback Amplifi er Source or Sink
Current
Feedback Amplifi er Clamp Voltage
Reference Voltage Line Regulation
Feedback Amplifi er Voltage Gain
Soft-Start Charging Current
Soft-Start Discharge Current
Control Pin Threshold (VCMP)
PG, SG, Output High Level
PG, SG, Output Low Level
PG, SG, Output Shutdown Strength
PG, SG Rise Time
PG, SG Fall Time
Switch Current Threshold at Maximum
V
Sense Threshold vs V
Sense Pin Overcurrent Fault Voltage
Shutdown High Level Input Voltage
Shutdown Low Level Input Voltage
CC
CC
CC
CC
CC
CC
CMP
Signature Range
Classifi cation Range
UVLO Turn-On Voltage
UVLO Turn-Off Voltage
Turn-On Voltage
Turn-Off Voltage
Hysteresis
Shunt Regulator Voltage
Supply Current
Start-Up Current
= 90k, unless otherwise specifi ed.
CMP
A
= 25°C. V
CONDITIONS
Voltage With Respect to V
(Notes 6, 7, 8, 9, 10)
Voltage With Respect to GND
Voltage With Respect to GND
V
I
Respect to GND
V
V
R
V
V
12V ≤ V
V
V
V
Duty Cycle = Min
V
C
C
Measured at V
V
With Respect to V
High Level = Shutdown (Note 12)
With Respect to V
VCC
TURNON
CMP
CC
FB
FB
CMP
SFST
SFST
UVLO
PG
PG
SENSE+
CMP
The
, C
, C
= 0.9V
= 1.4V
= 10V
= 15mA, V
= Open (Note 11)
= 1.2V to 1.7V
Open
= 1.5V
= 1.5V, V
SG
SG
= 0V; I
CC
, V
l
CC
– V
= 1nF
= 1nF
SFST
≤ 18V
denotes the specifi cations which apply over the full operating
= 14V, SG open, V
TURNOFF
PG
SENSE+
UVLO
UVLO
, I
< 1V
SG
PORTN
PORTN
= 0V
= 0V, Voltage With
= 20mA
PORTP
Pin
CMP
= 1.5V, V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
SENSE
–12.5
–37.7
–29.8
–1.5
19.5
1.22
MIN
700
0.8
6.6
14
25
16
88
8
4
4
3
= 0V, R
–38.9
–30.6
1.237
0.005
CMP
1000
1500
LTC4268-1
15.3
20.2
2.56
0.84
0.01
0.07
TYP
180
200
100
205
9.7
5.6
6.4
1.3
7.4
1.4
55
20
15
15
1
= 1k, R
–10.1
–40.2
–31.5
1.251
MAX
1400
16.6
0.02
0.05
0.45
–57
–21
400
110
230
7.2
2.3
11
10
90
25
57
8
tON
= 90k,
UNITS
42681fb
3
%/V
mA
A/V
V/V
mA
mV
V/V
mV
μA
nA
μA
μA
ns
ns
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V