LTC4269-1
IEEE 802.3at PD with
Synchronous No-Opto
Flyback Controller
FEATURES DESCRIPTION
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25.5W IEEE 802.3at Compliant (Type 2) PD The LTC 4269-1 is an integrated Powered Device (PD)
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Integrated State-of-the-Art Synchronous Flyback controller and switching regulator intended for high
Controller power IEEE 802.3at and 802.3af applications. The
LTC4269-1 is targeted for high ef ciency, single and
Isolated Power Supply Ef ciency >92%
multioutput applications from 10W to 25W. By support-
88% Ef ciency Including Diode Bridge and
ing both 1-event and 2-event classi cations, as de ned
Hot Swap FET
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by the IEEE, the LTC4269-1 can be used in a wide range
Flexible Integrated Auxiliary Power Support
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of product con gurations.
Superior EMI Performance
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Robust 100V 0.7 (Typ) Integrated Hot Swap MOSFET
The LTC4269-1 synchronous, current mode, yback con-
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IEEE 802.3at High Power Available Indicator
troller generates multiple supply rails in a single conversion
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Integrated Signature Resistor and Programmable
step providing for the highest system ef ciency while main-
Class Current
taining tight regulation across all outputs. The LTC4269-1
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Undervoltage, Overvoltage and Thermal Protection
includes Linear Technologys patented No-Opto feedback
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Short-Circuit Protection with Auto-Restart
topology to provide full IEEE 802.3 isolation without the
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Programmable Soft-Start and Switching Frequency
need of an opto-isolator circuit. A true soft-start function
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Complementary Power Good Indicators
allows graceful ramp-up of all output voltages.
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Thermally Enhanced 7mm 4mm DFN Package
All Linear Technology PD solutions include a shutdown
pin to provide exible auxiliary power options. The
APPLICATIONS
LTC4269-1 can accommodate adaptor voltages from 18V
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VoIP Phones with Advanced Display Options
to 60V and supports both PoE or aux dominance options.
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Dual-Radio Wireless Access Points
The LTC4269-1 is available in a space saving 32-pin DFN
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PTZ Security Cameras
package.
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RFID Readers
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
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Industrial Controls
trademarks are the property of their respective owners. Protected by U.S. Patents, including
5841643.
TYPICAL APPLICATION
25W High Ef ciency PD Solution
0.18H
5V
5A
10H
V
IN
47F +
+
100F
2.2F 39k
10F
383k 27.4k
10F
~ +
54V FROM
TO MICRO
DATA PAIR 14k 3.01k
CONTROLLER
~
+
PWRGD UVLO T2P FB V PG SENSE
CC
~ +
54V FROM V
PORTP
33m
SPARE PAIR
~
R
CLASS
SENSE
30.9
LTC4269-1
0.1F
SHDN SG
2.2nF
V V
PORTN CMP 1F
V SYNC GND OSC PGDLY t ENDLY R C
NEG ON CMP CMP
10nF
12k 100k 38.3k 1.21k
33pF 0.1F
42691 TA01a
42691fc
1LTC4269-1
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Notes 1, 2)
TOP VIEW
Pins with Respect to V
PORTN
SHDN 1 32 V
PORTP
V Voltage ......................................... 0.3V to 100V
PORTP
T2P 2 31 NC
V Voltage ......................................... 0.3V to V
NEG PORTP
R 3 30 PWRGD
CLASS
V Pull-Up Current ..................................................1A
NEG
NC 4 29 PWRGD
SHDN ....................................................... 0.3V to 100V
V 5 28 NC
PORTN
R , Voltage ............................................ 0.3V to 7V
CLASS
V 6 27 V
PORTN NEG
R Source Current ...........................................50mA
CLASS
NC 7 26 V
NEG
PWRGD Voltage (Note 3)
NC 8 33 25 NC
Low Impedance Source ......V 0.3V to V +11V
NEG NEG
SG 9 24 PG
Sink Current .........................................................5mA
V 10 23 PGDLY
CC
PWRGD, T2P Voltage ............................... 0.3V to 100V
t 11 22 R
ON CMP
PWRGD, T2P Sink Current .....................................10mA ENDLY 12 21 C
CMP
+
SYNC 13 20 SENSE
Pins with Respect to GND
SFST 14 19 SENSE
V (Note 3)
CC
OSC 15 18 UVLO
Low Impedance Source ....................... 0.3V to +18V
FB 16 17 V
CMP
Sink Current .......................................................30mA
+
SENSE , SENSE Voltage ........................ 0.5V to +0.5V
DKD32 PACKAGE
32-LEAD (7mm 4mm) PLASTIC DFN
UVLO, SYNC Voltage ...................................0.3V to V
CC
T = 125C, = 34C/W, = 2C/W
JMAX JA JC
FB Current ..............................................................2mA
GND, EXPOSED PAD (PIN 33) MUST BE SOLDERED TO A
HEAT SINKING PLANE THAT IS CONNECTED TO V
V Current .........................................................1mA NEG
CMP
Operating Ambient Temperature Range
LTC4269C-1 ................................................. 0C to 70C
LTC4269I-1 ..............................................40C to 85C
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 0C to 70C
LTC4269IDKD-1#PBF LTC4269IDKD-1#TRPBF 42691 32-Lead (7mm 4mm) Plastic DFN 40C to 85C
Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container.
For more information on lead free part marking, go to: