LTC4257IS8 Linear Technology, LTC4257IS8 Datasheet - Page 2
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LTC4257IS8
Manufacturer Part Number
LTC4257IS8
Description
IC CONTROLLER POE INTERFAC 8SOIC
Manufacturer
Linear Technology
Type
Power over Ethernet Switch (PoE)r
Datasheet
1.LTC4257CS8PBF.pdf
(20 pages)
Specifications of LTC4257IS8
Applications
IP Phones, Power over LAN, Network Routers and Switches
Internal Switch(s)
Yes
Current Limit
350mA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC4257IS8
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC4257IS8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LTC4257IS8#TRPBF
Manufacturer:
FSC
Quantity:
6 218
Company:
Part Number:
LTC4257IS8-1
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC4257IS8-1#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LTC4257IS8-1#TRPBF
Manufacturer:
LINEAR
Quantity:
7 556
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
LTC4257
(Notes 1, 2)
V
V
R
PWRGD Current .................................................. 10mA
R
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grades are identified by a label on the shipping container.
temperature range, otherwise specifications are at T
SYMBOL
V
I
I
∆I
PACKAGE/ORDER I FOR ATIO
2
IN_ON
IN_CLASS
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF
Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking:
IN
IN
OUT
CLASS
CLASS
CLASS
ORDER PART NUMBER
Voltage ............................................. 0.3V to – 100V
, PWRGD Voltage ............. V
Voltage ............................ V
Current .................................................. 100mA
LTC4257CS8
LTC4257IS8
PARAMETER
Supply Voltage
IC Supply Current when ON
IC Supply Current During Classification V
Current Accuracy During Classification 10mA < I
Maximum Operating Voltage
Signature Range
Classification Range
UVLO Turn-On Voltage
UVLO Turn-Off Voltage
R
CLASS
W
V
NC
NC
IN
T
JMAX
1
2
3
4
8-LEAD PLASTIC SO
= 150°C, θ
S8 PACKAGE
TOP VIEW
W W
JA
U
= 150°C/W
IN
S8 PART MARKING
8
7
6
5
+ 100V to V
IN
GND
NC
PWRGD
V
+ 7V to V
OUT
W
4257
4257I
U
CONDITIONS
Voltage with Respect to GND Pin (Notes 4, 5, 6)
V
(Note 7)
(Notes 8, 9)
IN
IN
A
= 25°C. (Note 3)
= – 48V, Pins 5, 6 Floating
= – 17.5V, Pin 2 Floating, V
IN
IN
– 0.3V
– 0.3V
http://www.linear.com/leadfree/
The
CLASS
U
●
< 40mA, – 12.5V ≤ V
denotes the specifications which apply over the full operating
Operating Ambient Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART NUMBER
LTC4257C ............................................... 0°C to 70°C
LTC4257I ............................................. –40°C to 85°C
S8 Package ....................................... – 65°C to 150°C
DD Package ...................................... – 65°C to 125°C
LTC4257CDD
LTC4257IDD
OUT
Tied to GND
IN
≤ – 21V,
R
CLASS
ELECTRICALLY ISOLATED PCB HEATSINK
8-LEAD (3mm × 3mm) PLASTIC DFN
V
NC
NC
EXPOSED PAD TO BE SOLDERED TO
IN
T
JMAX
1
2
3
4
= 125°C, θ
DD PACKAGE
TOP VIEW
●
●
●
●
●
●
●
●
JA
– 12.5
– 37.7
– 29.3
– 1.5
0.35
MIN
= 43°C/W
DD PART MARKING*
8
7
6
5
GND
NC
PWRGD
V
OUT
–39.2
–30.5
0.50
TYP
LACT
– 40.2
– 31.5
MAX
– 9.5
±3.5
0.65
– 57
– 21
3
UNITS
4257fb
mA
mA
%
V
V
V
V
V