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Linear Technology Electronic Components Datasheet

LTC4267CGN-1 Datasheet

Power over Ethernet IEEE 802.3af PD Interface

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LTC4267-1
Features
Power over Ethernet
IEEE 802.3af PD Interface with
Integrated Switching Regulator
Description
n Complete Power Interface Port for IEEE 802®.3af
Powered Device (PD)
n Onboard 100V, UVLO Switch
n Precision Dual Level Inrush Current Limit
n Integrated Current Mode Switching Regulator
n Onboard 25k Signature Resistor with Disable
n Programmable Classification Current (Class 0-4)
n Thermal Overload Protection
n Power Good Signal
n Integrated Error Amplifier and Voltage Reference
n Low Profile 16-Pin SSOP Package
Applications
n IP Phone Power Management
n Wireless Access Points
n Security Cameras
n Power over Ethernet
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTPoE++ is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
The LTC®4267-1 combines an IEEE 802.3af compliant
Powered Device (PD) interface with a current mode switch-
ing regulator, providing a complete power solution for PD
applications. The LTC4267-1 integrates the 25k signature
resistor, classification current source, thermal overload
protection, signature disable and power good signal along
with an undervoltage lockout optimized for use with the
IEEE-required diode bridge. The LTC4267-1 provides an
increased operational current limit, maximizing power
available for class 3 applications.
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 LTC4267-1 includes an onboard error amplifier
and voltage reference allowing use in both isolated and
nonisolated configurations.
The LTC4267-1 is available in a space saving, low profile
16-pin SSOP package.
Typical Application
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
LTC4267-1
NGATE
0.1µF
SENSE
RCLASS
68.1Ω
1%
RCLASS ITH/RUN
VFB
SIGDISA PGND
VPORTN
POUT
10k
+
PVCC + 5µF
4.7µF
MIN
320µF
MIN
10k Si3440
PVCC
6.8k
0.1Ω
BAS516
PS2911
470Ω
22nF
3.3V
1.5A
CHASSIS
100k
For more information www.linear.com/4267-1
TLV431
60.4k
42671 TA01
42671fa
1


Linear Technology Electronic Components Datasheet

LTC4267CGN-1 Datasheet

Power over Ethernet IEEE 802.3af PD Interface

No Preview Available !

LTC4267-1
Absolute Maximum Ratings
(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-1.............................................. 0°C to 70°C
LTC4267I-1...........................................–40°C to 85°C
Junction Temperature............................................ 150°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
Pin Configuration
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
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
TJMAX = 150°C, θJA = 90°C/W
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4267CGN-1#PBF
LTC4267CGN-1#TRPBF 4267-1
16-Lead Narrow Plastic SSOP
0°C to 70°C
LTC4267IGN-1#PBF
LTC4267IGN-1#TRPBF 4267I-1
16-Lead Narrow Plastic SSOP
–40°C to 85°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4267CGN-1
LTC4267CGN-1#TR
4267-1
16-Lead Narrow Plastic SSOP
0°C to 70°C
LTC4267IGN-1
LTC4267IGN-1#TR
4267I-1
16-Lead Narrow Plastic SSOP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
42671fa
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For more information www.linear.com/4267-1


Part Number LTC4267CGN-1
Description Power over Ethernet IEEE 802.3af PD Interface
Maker Linear
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LTC4267CGN-1 Datasheet PDF






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