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LTC4269IDKD-2#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
LTC4269-2
1
42692fb
Typical applicaTion
FeaTures
applicaTions
DescripTion
IEEE 802.3at High Power PD
and Synchronous Forward
Controller with AUX Support
The LTC
®
4269-2 is an integrated Powered Device (PD)
interface and power supply controller featuring 2-event
classification signaling, flexible auxiliary power op-
tions, and a power supply controller suitable for syn-
chronously rectified forward supplies. These features
make the LTC4269-2 ideally suited for an IEEE802.3at
PD application.
The PD controller features a 100V MOSFET that isolates
the power supply during detection and classification, and
provides 100mA inrush current limit. Also included are
power good outputs, an undervoltage/overvoltage lock-
out and thermal protection. The current mode forward
controller allows for synchronous rectification, resulting
in an extremely high efficiency, green product. Soft-start
for controlled output voltage start-up and fault recovery is
included. Programmable frequency over 100kHz to 500kHz
allows flexibility in efficiency vs size and low EMI.
n
25.5W IEEE 802.3at Compliant (Type-2) PD
n
PoE
+
2-Event Classification
n
IEEE 802.3at High Power Available Indicator
n
Integrated State-of-the-Art Synchronous Forward
Controller
–
Isolated Power Supply Efficiency >94%
n
Flexible Auxiliary Power Interface
n
Superior EMI Performance
n
Robust 100V 0.7Ω (Typ) Integrated Hot Swap™
MOSFET
n
Integrated Signature Resistor, Programmable Class
Current, UVLO, OVLO and Thermal Protection
n
Short-Circuit Protection with Auto-Restart
n
Programmable Switching Frequency from
100kHz to 500kHz
n
Thermally Enhanced 7mm × 4mm DFN Package
n
IP Phones with Large Color Screens
n
Dual Radio 802.11n Access Points
n
PTZ Security Cameras
+
T2P V
NEG
V
PORTN
SHDN
R
CLASS
V
PORTP
PGND
TO
MICRO-
CONTROLLER
GND BLANK DELAY
82k
30.9Ω
332k 158k
133Ω
10k
5.1Ω
158k
22.1k
33k
1.5k
50mΩ
2k
1.2k
TLV431
V
CC
11.3k
3.65k
42692 TA01
22k
0.22µF
0.1µF
R
OSC
V
REF
FB
COMP
I
SENSE
OC
SS_MAXDC
SD_V
SEC
V
IN
PWRGD
S
OUT
LTC4269-2
0.1µF
10µF
V
CC
33k
237k
2.2µF
+
10µF
10µH
1mH
6.8µH
10.0k
OUT
4.7nF
0.1µF
54V FROM
DATA PAIR
54V FROM
SPARE PAIR
+
–
~
~
+
–
~
~
4.7nF
•
•
•
10nF
+
220µF
5V
5A
PoE-Based Self-Driven Synchronous Forward Power Supply
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap, ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
LTC4269-2
2
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pin conFiguraTionabsoluTe MaxiMuM raTings
(Notes 1, 2)
TOP VIEW
33
DKD PACKAGE
32-LEAD (7mm s 4mm) PLASTIC DFN
SHDN 1
T2P 2
R
CLASS
3
NC 4
V
PORTN
5
V
PORTN
6
NC 7
NC 8
COMP 9
FB 10
R
OSC
11
SYNC 12
SS_MAXDC 13
V
REF
14
SD_V
SEC
15
GND 16
32 V
PORTP
31 NC
30 NC
29 PWRGD
28 PWRGD
27 V
NEG
26 V
NEG
25 NC
24 SOUT
23 V
IN
22 OUT
21 PGND
20 DELAY
19 OC
18 I
SENSE
17 BLANK
T
JMAX
= 125°C, θ
JA
= 34°C/W, θ
JC
= 2°C/W
EXPOSED PAD (PIN 33) MUST BE SOLDERED TO
HEAT SINKING PLANE THAT IS CONNECTED TO GND
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4269CDKD-2#PBF LTC4269CDKD-2#TRPBF 42692
32-Lead (7mm × 4mm) Plastic DFN
0°C to 70°C
LTC4269IDKD-2#PBF LTC4269IDKD-2#TRPBF 42692
32-Lead (7mm × 4mm) Plastic DFN
–40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4269CDKD-2 LTC4269CDKD-2#TR 42692
32-Lead (7mm × 4mm) Plastic DFN
0°C to 70°C
LTC4269IDKD-2 LTC4269IDKD-2#TR 42692
32-Lead (7mm × 4mm) Plastic DFN
–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/
Pins with Respect to V
PORTN
V
PORTP
Voltage ........................................ –0.3V to 100V
V
NEG
Voltage .........................................–0.3V to V
PORTP
V
NEG
Pull-Up Current ..................................................1A
SHDN ....................................................... –0.3V to 100V
R
CLASS
, Voltage ........................................... –0.3V to 7V
R
CLASS
Source Current ..........................................50mA
PWRGD Voltage (Note 3)
Lo
w Impedance Source .... V
NEG
– 0.3V to V
NEG
+ 11V
Sink Current .........................................................5mA
PWRGD, T2P Voltage ............................... –0.3V to 100V
PWRGD, T2P Sink Current .....................................10mA
Pins with Respect to GND
V
IN
(Note 4) ................................................ –0.3V to 25V
SYNC, SS_MAXDC, SD_V
SEC
,
I
SENSE
, OC .................................................... –0.3V to 6V
COMP, BLANK, DELAY .............................. –0.3V to 3.5V
FB
................................................................ –0.3V to 3V
R
OSC
Current ........................................................ –50µA
V
REF
Source Current ..............................................10mA
Operating Ambient Temperature Range
LT
C4269C-2 ............................................. 0°C to 70°C
LT
C4269I-2 ..........................................–40°C to 85°C
LTC4269-2
3
42692fb
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Interface Controller (Note 5)
Operating Input Voltage
Signature Range
Classification Range
On Voltage
Undervoltage Lockout
Overvoltage Lockout
At V
PORTP
(Note 6)
l
l
l
l
1.5
12.5
30.0
71.0
60
9.8
21.0
37.2
V
V
V
V
V
V
ON/UVLO Hysteresis Window
l
4.1 V
Signature/Class Hysteresis Window
l
1.4 V
Reset Threshold State Machine Reset for 2-Event Classification
l
2.57 5.40 V
Supply Current
Supply Current at 57V Measured at V
PORTP
Pin
l
1.35 mA
Class O Current V
PORTP
= 17.5V, No R
CLASS
Resistor
l
0.40 mA
Signature
Signature Resistance 1.5V ≤ V
PORTP
≤ 9.8V (Note 7)
l
23.25 26.00 kΩ
Invalid Signature Resistance, SHDN Invoked 1.5V ≤ V
PORTP
≤ 9.8V, V
SHDN
= 3V (Note 7)
l
11 kΩ
Invalid Signature Resistance During Mark Event (Notes 7, 8)
l
11 kΩ
Classification
Class Accuracy 10mA < I
CLASS
< 40mA, 12.5V < V
PORTP
< 21V
(Notes 9, 10)
l
±3.5 %
Classification Stability Time V
PORTP
Pin Step to 17.5V, R
CLASS
= 30.9Ω,
I
CLASS
within 3.5% of Ideal Value (Notes 9, 10)
l
1 ms
Normal Operation
Inrush Current V
PORTP
= 54V, V
NEG
= 3V
l
60 100 180 mA
Power FET On-Resistance Tested at 600mA into V
NEG
, V
PORTP
= 54V
l
0.7 1.0 Ω
Power FET Leakage Current at V
NEG
V
PORTP
= SHDN = V
NEG
= 57V
l
1 µA
Digital Interface
SHDN Input High Level Voltage
l
3 V
SHDN Input Low Level Voltage
l
0.45 V
SHDN Input Resistance V
PORTP
= 9.8V, SHDN = 9.65V
l
100 kΩ
PWRGD, T2P Output Low Voltage Tested at 1mA, V
PORTP
= 57V, For T2P, Must
Complete 2-Event Classification to See Active Low
l
0.15 V
PWRGD, T2P Leakage Current Pin Voltage Pulled 57V, V
PORTP
= V
PORTN
= 0V
l
1 µA
PWRGDP Output Low Voltage Tested at 0.5mA, V
PORTP
= 52V, V
NEG
= 4V, Output
Voltage is with Respect to V
NEG
l
0.4 V
PWRGDP Clamp Voltage Tested at 2mA, V
NEG
= 0V, Voltage is with Respect
to V
NEG
l
12.0 16.5 V
PWRGDP Leakage Current V
PWRGD
= 11V, V
NEG
= 0V, Voltage is with Respect
to V
NEG
l
1 µA
PWM Controller (Note 11)
Operational Input Voltage I
VREF
= 0µA
l
V
IN(OFF)
25 V
V
IN
Quiescent Current I
VREF
= 0µA, I
SENSE
= OC = Open 5.2 6.5 mA
V
IN
Start-Up Current FB = 0V, SS_MAXDC = 0V (Notes 12, 13)
l
460 700 µA
V
IN
Shutdown Current SD_V
SEC
= 0V (Notes 12, 13)
l
240 350 µA
SD_V
SEC
Threshold 10V < SD < 25V 1.261 1.32 1.379 V
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LTC4269IDKD-2#TRPBF

Mfr. #:
Buy LTC4269IDKD-2#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Power Switch ICs - POE / LAN IEEE802.3at High Power PD Controller with Forward Switcher
Lifecycle:
New from this manufacturer.
Delivery:
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