LTC4257IS8 Linear Technology, LTC4257IS8 Datasheet - Page 2

• Manufacturer Part Number: LTC4257IS8
• Description: IC CONTROLLER POE INTERFAC 8SOIC
• Manufacturer: Linear Technology
• Type: Power over Ethernet Switch (PoE)r

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

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