LTC4278CDKD#PBF Linear Technology, LTC4278CDKD#PBF Datasheet - Page 40

• Manufacturer Part Number: LTC4278CDKD#PBF
• Description: IC PD IEEE 802.3AT 25.5W 32-DFN
• Manufacturer: Linear Technology

Specifications of LTC4278CDKD#PBF

• Controller Type: Powered Device Interface Controller (PD)
• Interface: IEEE 802.3af
• Voltage - Supply: 4.5 V ~ 20 V
• Current - Supply: 6.4mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 32-DFN
• Input Voltage: 60V
• Supply Current: 1.35mA
• Digital Ic Case Style: DFN
• No. Of Pins: 32
• Duty Cycle (%): 88%
• Frequency: 100kHz
• Operating Temperature Range: °C To +70°C
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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ThinSOT is a trademark of Linear Technology Corporation.
40
®
1952
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
DESCRIPTION
Single Switch Synchronous Forward Counter
Current Mode Flyback DC/DC Controller in ThinSOT
Adjustable Frequency Current Mode Flyback Controller
Isolated No-Opto Synchronous Flyback Controller with
Wide Input Supply Range
IEEE 802.3af PD Interface Controller
Quad IEEE 802.3af Power over Ethernet Controller
Quad IEEE 802.3af Power over Ethernet Controller
Single IEEE 802.3af Power over Ethernet Controller
High Power Single PSE Controller
High Power PD Interface Controller with 750mA
Current Limit
IEEE 802.3at High Power PD Interface Controller with
2-Event Classifi cation
IEEE 802.3at Quad PSE Controller
IEEE 802.3af PD Interface with an Integrated
Switching Regulator
IEEE 802.3af PD Interface with an Integrated
Switching Regulator
High Power PD with Synchronous No-Opto Flyback
Controller
IEEE 802.3af/IEEE 802.3at PD with Synchronous
No-Opto Flyback Controller
IEEE 802.3af/IEEE 802.3at PD with Synchronous
Forward Controller
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FAX: [phone]
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www.linear.com
TM
COMMENTS
Synchronous Controller, Programmable Volt-Sec Clamp, Low Start Current
300kHz Constant-Frequency, Adjustable Slope Compensation, Optimized
for High Input Voltage Applications
Slope Comp, Overcurrent Protect, Internal/External Clock
Adjustable Switching Frequency, Programmable Undervoltage Lockout,
Accurate Regulation without Trim, Synchronous for High Effi ciency
100V 400mA Internal Switch, Programmable Classifi cation, Dual
Current Limit
DC Disconnect Only, IEEE-Compliant PD Detection and Classifi cation,
Autonomous Operation or I
AC or DC Disconnect, IEEE-Compliant PD Detection and Classifi cation,
Autonomous Operation
AC or DC Disconnect, IEEE-Compliant PD Detection and Classifi cation,
Autonomous Operation or I
Internal Switch, Autonomous Operation, 30W
750mA Internal Switch, Programmable Classifi cation Current to 75mA,
Precision Dual Current Limit with Disable.
2-Event Classifi cation Recognition, 100mA Inrush Current, Single-Class
Programming Resistor, Full Compliance to 802.3at
Supports IEEE 802.3at Type 1 and Type 2 PDs, 0.34Ω Channel Resistance,
Advanced Power Management, High Reliability 4-Point PD Detection,
Legacy Capacitance Detect
100V 400mA Internal Switch, Programmable Classifi cation, 200kHz
Constant-Frequency PWM, Optimized for IEEE-Compliant PD System
100V 400mA Internal Switch, Programmable Classifi cation, 300kHz
Constant-Frequency PWM, Optimized for IEEE-Compliant PD System
IEEE 802.3af Compliant, 750mA Hot Swap FET, 92% Power Supply
Effi ciency, Flexible Aux Support, Superior EMI
2-Event Classifi cation Recognition, 92% Power Supply Effi ciency, Flexible
Aux Support, Superior EMI
2-Event Classifi cation Recognition, 94% Power Supply Effi ciency, Flexible
Aux Support, Superior EMI
2
2
C Control
C Control
© LINEAR TECHNOLOGY CORPORATION 2009
LT 1009 REV A • PRINTED IN USA
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