900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC4267IDHC Datasheet

Power over Ethernet IEEE 802.3af PD Interface

No Preview Available !

LTC4267
Power over Ethernet
IEEE 802.3af PD Interface with
Integrated Switching Regulator
FEATURES
Complete Power Interface Port for IEEE 802®.3af
Powered Device (PD)
Onboard 100V, 400mA UVLO Switch
Precision Dual Level Inrush Current Limit
Integrated Current Mode Switching Regulator
Onboard 25kΩ Signature Resistor with Disable
Programmable Classification Current (Class 0-4)
Thermal Overload Protection
Power Good Signal
Integrated Error Amplifier and Voltage Reference
Low Profile 16-Pin SSOP and 3mm × 5mm DFN
Packages
U
APPLICATIO S
IP Phone Power Management
Wireless Access Points
Security Cameras
Power over Ethernet
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
DESCRIPTIO
The LTC®4267 combines an IEEE 802.3af compliant Pow-
ered Device (PD) interface with a current mode switching
regulator, providing a complete power solution for PD
applications. The LTC4267 integrates the 25kΩ signature
resistor, classification current source, thermal overload pro-
tection, signature disable and power good signal along with
an undervoltage lockout optimized for use with the IEEE-
required diode bridge. The precision dual level input current
limit allows the LTC4267 to charge large load capacitors
and interface with legacy PoE systems.
The current mode switching regulator is designed for
driving a 6V rated N-channel MOSFET and features pro-
grammable slope compensation, soft-start, and constant
frequency operation, minimizing noise even with light
loads. The LTC4267 includes an onboard error amplifier
and voltage reference allowing use in both isolated and
nonisolated configurations.
The LTC4267 is available in space saving, low profile
16-pin SSOP or DFN packages.
TYPICAL APPLICATIO
Class 2 PD with 3.3V Isolated Power Supply
PA1133 SBM1040
–48V
FROM
DATA PAIR
+
HD01
–48V
FROM
SPARE PAIR
+
HD01
VPORTP
PVCC
SMAJ58A
PWRGD
LTC4267
NGATE
0.1µF
SENSE
RCLASS
68.1
1%
RCLASS ITH/RUN
VFB
SIGDISA PGND
VPORTN
POUT
10k
+
PVCC + 5µF
4.7µF
MIN
320µF
MIN
10k Si3440
PVCC
0.1
470
6.8k
22nF
BAS516
PS2911
3.3V
1.5A
CHASSIS
100k
TLV431
60.4k
4267 TA01
4267fc
1


Linear Technology Electronic Components Datasheet

LTC4267IDHC Datasheet

Power over Ethernet IEEE 802.3af PD Interface

No Preview Available !

LTC4267
ABSOLUTE AXI U RATI GS
(Note 1)
VPORTN with Respect to VPORTP Voltage... 0.3V to –100V
POUT, SIGDISA, PWRGD
Voltage..................... VPORTN + 100V to VPORTN –0.3V
PVCC to PGND Voltage (Note 2)
Low Impedance Source ........................... – 0.3V to 8V
Current Fed .......................................... 5mA into PVCC
RCLASS Voltage .................VPORTN + 7V to VPORTN – 0.3V
PWRGD Current.....................................................10mA
RCLASS Current.....................................................100mA
NGATE to PGND Voltage ...........................– 0.3V to PVCC
VFB, ITH/RUN to PGND Voltages................ –0.3V to 3.5V
SENSE to PGND Voltage .............................. –0.3V to 1V
NGATE Peak Output Current (<10μs) ..........................1A
Operating Ambient Temperature Range
LTC4267C ................................................ 0°C to 70°C
LTC4267I .............................................– 40°C to 85°C
Junction Temperature
GN Package ...................................................... 150°C
DHC Package .................................................... 125°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ITH/RUN 1
PGND 2
NGATE 3
PVCC 4
RCLASS 5
NC 6
VPORTN 7
NC 8
16 VFB
15 PGND
14 SENSE
17
13 VPORTP
12 SIGDISA
11 PWRGD
10 POUT
9 NC
ORDER PART
NUMBER
LTC4267CDHC
LTC4267IDHC
DFN PART*
MARKING
PGND 1
ITH/RUN 2
NGATE 3
PVCC 4
RCLASS 5
NC 6
VPORTN 7
PGND 8
TOP VIEW
16 PGND
15 VFB
14 SENSE
13 VPORTP
12 SIGDISA
11 PWRGD
10 POUT
9 PGND
ORDER PART
NUMBER
LTC4267CGN
LTC4267IGN
GN PART
MARKING
DHC16 PACKAGE
16-LEAD (3mm × 5mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43.5°C/W
EXPOSED PAD (PIN 17) MUST BE SOLDERED
TO ELECTRICALLY ISOLATED PCB HEAT SINK
4267
4267
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
TJMAX = 150°C, θJA = 90°C/W
4267
4267I
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF
Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grades are identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VPORTN
VTURNON
VTURNOFF
VHYST
VCLAMP1mA
Supply Voltage
Maximum Operating Voltage
Signature Range
Classification Range
UVLO Turn-On Voltage
UVLO Turn-Off Voltage
PVCC Turn-On Voltage
PVCC Turn-Off Voltage
PVCC Hysteresis
PVCC Shunt Regulator Voltage
Voltage with Respect to VPORTP Pin
(Notes 4, 5, 6)
Voltage with Respect to PGND
Voltage with Respect to PGND
VTURNON – VTURNOFF
IPVCC = 1mA, VITH/RUN = 0V, Voltage
with Respect to PGND
– 57
V
–1.5
– 9.5
V
–12.5
– 21
V
–34.8 –36.0 –37.2
V
–29.3 –30.5 –31.5
V
7.8
8.7
9.2
V
4.6
5.7
6.8
V
1.5
3.0
V
8.3
9.4 10.3
V
4267fc
2


Part Number LTC4267IDHC
Description Power over Ethernet IEEE 802.3af PD Interface
Maker Linear
PDF Download

LTC4267IDHC Datasheet PDF






Similar Datasheet

1 LTC4267IDHC Power over Ethernet IEEE 802.3af PD Interface
Linear
2 LTC4267IDHC-3 Power over Ethernet IEEE 802.3af PD Interface
Linear





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy