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LTC4269CDKD-1#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P44
LTC4269-1
1
42691fc
•
•
•
•
33mΩ
39k
10µF
30.9
1.21k38.3k100k12k
10nF
10µF
2.2µF
0.1µF
33pF
0.1µF
2.2nF
1µF
t
ON
SYNC PGDLY
UVLOPWRGD
SENSE
–
V
CMP
SENSE
+
R
CMP
V
NEG
SHDN
R
CLASS
V
PORTP
V
PORTN
ENDLYOSC
LTC4269-1
GND
FB
V
CC
V
IN
SG
PG
C
CMP
10µH
TO MICRO
CONTROLLER
•
47µF
0.18µH
5V
5A
100µF
+
+
3.01k
27.4k
T2P
14k
383k
54V FROM
DATA PAIR
54V FROM
SPARE PAIR
+
–
~
~
+
–
~
~
42691 TA01a
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
IEEE 802.3at PD with
Synchronous No-Opto
Flyback Controller
The LTC
®
4269-1 is an integrated Powered Device (PD)
controller and switching regulator intended for high
power IEEE 802.3at and 802.3af applications. The
LTC4269-1 is targeted for high effi ciency, single and
multioutput applications from 10W to 25W. By support-
ing both 1-event and 2-event classifi cations, as defi ned
by the IEEE, the LTC4269-1 can be used in a wide range
of product confi gurations.
The LTC4269-1 synchronous, current mode, fl yback con-
troller generates multiple supply rails in a single conversion
step providing for the highest system effi ciency while main-
taining tight regulation across all outputs. The LTC4269-1
includes Linear Technology’s patented No-Opto feedback
topology to provide full IEEE 802.3 isolation without the
need of an opto-isolator circuit. A true soft-start function
allows graceful ramp-up of all output voltages.
All Linear Technology PD solutions include a shutdown
pin to provide fl exible auxiliary power options. The
LTC4269-1 can accommodate adaptor voltages from 18V
to 60V and supports both PoE or aux dominance options.
The LTC4269-1 is available in a space saving 32-pin DFN
package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
5841643.
n
25.5W IEEE 802.3at Compliant (Type 2) PD
n
Integrated State-of-the-Art Synchronous Flyback
Controller
– Isolated Power Supply Effi ciency >92%
– 88% Effi ciency Including Diode Bridge and
Hot Swap™ FET
n
Flexible Integrated Auxiliary Power Support
n
Superior EMI Performance
n
Robust 100V 0.7Ω (Typ) Integrated Hot Swap MOSFET
n
IEEE 802.3at
High Power Available
Indicator
n
Integrated Signature Resistor and Programmable
Class Current
n
Undervoltage, Overvoltage and Thermal Protection
n
Short-Circuit Protection with Auto-Restart
n
Programmable Soft-Start and Switching Frequency
n
Complementary Power Good Indicators
n
Thermally Enhanced 7mm × 4mm DFN Package
n
VoIP Phones with Advanced Display Options
n
Dual-Radio Wireless Access Points
n
PTZ Security Cameras
n
RFID Readers
n
Industrial Controls
25W High Effi ciency PD Solution
LTC4269-1
2
42691fc
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
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)
Low 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
CC
(Note 3)
Low Impedance Source ....................... –0.3V to +18V
Sink Current .......................................................30mA
SENSE
–
, SENSE
+
Voltage ........................ –0.5V to +0.5V
UVLO, SYNC Voltage ...................................–0.3V to V
CC
FB Current ..............................................................±2mA
V
CMP
Current .........................................................±1mA
Operating Ambient Temperature Range
LTC4269C-1 ................................................. 0°C to 70°C
LTC4269I-1 ..............................................–40°C to 85°C
(Notes 1, 2)
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
33
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
V
PORTP
NC
PWRGD
PWRGD
NC
V
NEG
V
NEG
NC
PG
PGDLY
R
CMP
C
CMP
SENSE
+
SENSE
–
UVLO
V
CMP
SHDN
T2P
R
CLASS
NC
V
PORTN
V
PORTN
NC
NC
SG
V
CC
t
ON
ENDLY
SYNC
SFST
OSC
FB
TOP VIEW
DKD32 PACKAGE
32-LEAD (7mm × 4mm) PLASTIC DFN
T
JMAX
= 125°C, θ
JA
= 34°C/W, θ
JC
= 2°C/W
GND, EXPOSED PAD (PIN 33) MUST BE SOLDERED TO A
HEAT SINKING PLANE THAT IS CONNECTED TO V
NEG
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4269CDKD-1#PBF LTC4269CDKD-1#TRPBF 42691 32-Lead (7mm × 4mm) Plastic DFN 0°C to 70°C
LTC4269IDKD-1#PBF LTC4269IDKD-1#TRPBF 42691 32-Lead (7mm × 4mm) Plastic DFN –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed 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 specifi cations, go to:
http://www.linear.com/tapeandreel/
LTC4269-1
3
42691fc
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Interface Controller (Note 4)
Operating Input Voltage
Signature Range
Classifi cation Range
ON Voltage
OFF Voltage
Overvoltage Lockout
At V
PORTP
(Note 5)
l
l
l
l
1.5
12.5
30.0
71
60
9.8
21
37.2
V
V
V
V
V
V
ON/OFF Hysteresis Window
l
4.1 V
Signature/Class Hysteresis Window
l
1.4 V
Reset Threshold State Machine Reset for 2-Event Classifi cation
l
2.57 5.40 V
Supply Current
Supply Current at 57V Measured at V
PORTP
Pin
l
1.35 mA
Class 0 Current V
PORTP
= 17.5V, No R
CLASS
Resistor
l
0.40 mA
Signature
Signature Resistance 1.5V ≤ V
PORTP
≤ 9.8V (Note 6)
l
23.25 26 k
Invalid Signature Resistance, SHDN Invoked 1.5V ≤ V
PORTP
≤ 9.8V, V
SHDN
= 3V (Note 6)
l
11 k
Invalid Signature Resistance During Mark Event (Notes 6, 7)
l
11 k
Classifi cation
Class Accuracy 10mA < I
CLASS
< 40mA, 12.5V < V
PORTP
< 21V
(Notes 8, 9)
l
±3.5 %
Classifi cation Stability Time V
PORTP
Pin Step to 17.5V, R
CLASS
= 30.9, I
CLASS
Within
3.5% of Ideal Value (Notes 8, 9)
l
1ms
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
Power FET Leakage Current at V
NEG
V
PORTP
= SHDN = V
NEG
= 57V
l
1µA
Digital Interface
SHDN Input High Level Voltage
l
3V
SHDN Input Low Level Voltage
l
0.45 V
SHDN Input Resistance V
PORTP
= 9.8V, SHDN = 9.65V
l
100 k
PWRGD, T2P Output Low Voltage Tested at 1mA, V
PORTP
= 54V. For T2P, Must Complete
2-Event Classifi cation to See Active Low
l
0.15 V
PWRGD, T2P Leakage Current Pin Voltage Pulled 57V, V
PORTP
= V
PORTN
= 0V
l
1µA
PWRGD Output Low Voltage Tested at 0.5mA, V
PORTP
= 52V, V
NEG
= 48V, Output
Voltage Is with Respect to V
NEG
l
0.4 V
PWRGD Clamp Voltage Tested at 2mA, V
NEG
= 0V, Voltage with Respect to V
NEG
l
12 16.5 V
PWRGD Leakage Current V
PWRGD
= 11V, V
NEG
= 0V, Voltage with Respect to V
NEG
l
1µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P44

LTC4269CDKD-1#PBF

Mfr. #:
Buy LTC4269CDKD-1#PBF
Manufacturer:
Analog Devices Inc.
Description:
Power Switch ICs - POE / LAN IEEE 802.3at High Power PD Controller with Flyback Switcher
Lifecycle:
New from this manufacturer.
Delivery:
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