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參數資料
| 型號： | LTC4278IDKD#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數： | 1/42頁 |
| 文件大小： | 0K |
| 描述： | IC PD IEEE 802.3AT 25.5W 32-DFN |
| 標準包裝： | 2,500 |
| 控制器類型： | 供電設備接口控制器（PD） |
| 接口： | IEEE 802.3af |
| 電源電壓： | 4.5 V ~ 20 V |
| 電流 - 電源： | 6.4mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-WFDFN 裸露焊盤 |
| 供應商設備封裝： | 32-DFN（7x4）裸露焊盤 |
| 包裝： | 帶卷 (TR) |
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LTC4278
1
4278fc
12m
1F
30.9
24k
1.8k
38.3k
100k
12k
0.1F
33pF
0.1F
2.2nF
1F
tON
SYNC
PGDLY
UVLO PWRGD
SENSE–
VCMP
SENSE+
RCMP
VNEG
RCLASS
SHDN
VPORTP
VPORTN
ENDLY
OSC
LTC4278
GND
FB
VCC
SG
PG
CCMP
TO MICRO
CONTROLLER
47F
0.18H
5V
4.5A
100F
+
3.01k
21.5k
T2P
46.4k
294k
10F
8.2H
EPC3472G-LF
FDMS2572
HAT2169
54V FROM
DATA PAIR
AUXILIARY
SUPPLY
(10V TO 57V)
54V FROM
SPARE PAIR
+
–
+
–
~
4278 TA01a
BSS63
PDS5100H
B1100
+
–
~
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
IEEE 802.3at PD with
Synchronous No-Opto Flyback
Controller and 12V Aux Support
The LTC4278 is an integrated Powered Device (PD) con-
troller and switching regulator intended for high power
IEEE 802.3at and 802.3af applications. With a wide input
voltage range, the LTC4278 is specifically designed to sup-
port PD applications that include a low-voltage auxiliary
power input such as a 12V wall adaptor. The inclusion of
a shutdown pin provides simple implementation of both
PoE and auxiliary dominate applications. In addition, the
LTC4278supportsboth1-eventand2-eventclassifications
as defined by the IEEE, thereby allowing the use in a wide
range of product configurations.
TheLTC4278synchronous,currentmode,flybackcontrol-
ler generates multiple supply rails in a single conversion
stepprovidingforthehighestsystemefficiencywhilemain-
taining tight regulation across all outputs. The LTC4278
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.
The LTC4278 is available in a space saving 32-lead DFN
package.
n
25.5W IEEE 802.3at Compliant (Type 2) PD
n
10V to 57V Auxiliary Power Input
n
Shutdown Pin for Flexible Auxiliary Power Support
n
Integrated State-of-the-Art No-Opto Synchronous
Flyback Controller
– Isolated Power Supply Efficiency >92%
– 88% Efficiency Including Diode Bridge and
Hot Swap FET
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 PD Solution with 12V Auxiliary
L
, LT, LTC, LTM, Linear Technology, SwitcherCAD and the Linear logo are registered
trademarks and Hot Swap and ThinSOT are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5841643.
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