LM5070 Texas instruments

LM5070

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LM5070

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Описание

The LM5070 power interface port and pulse width modulation (PWM) controller provides a complete integrated solution for Powered Devices (PD) that connect into Power over Ethernet (PoE) systems. The LM5070 integrates an 80V, 400mA line connection switch and associated control for a fully IEEE 802.3af compliant interface with a full featured current mode pulse width modulator dc-dc converter. All power sequencing requirements between the controller interface and switch mode power supply (SMPS) are integrated into the IC. Two options are available providing either an 80% maximum duty cycle limit with slope compensation (on the –80 suffix) device or a 50% maximum duty cycle limit and no slope compensation on the (–50 suffix) device.

Fully Compliant 802.3af Power Interface Port
80V, 1Ω, 400 mA Internal MOSFET
Programmable Inrush Current Limit
Detection Resistor Disconnect Function
Programmable Classification Current
Programmable Under-voltage Lockout with Programmable Hysteresis
Thermal Shutdown Protection
Current Mode Pulse Width Modulator
Supports Both Isolated and Non-Isolated Applications
Error Amplifier and Reference for Non-Isolated Applications
Programmable Oscillator Frequency
Programmable Soft-Start
80% Maximum Duty Cycle Limiter, Slope Compensation (-80 device)
50% Maximum Duty Cycle Limiter, No Slope Compensation (-50 device)
800 mA Peak Gate Driver

Packages

TSSOP-16
WSON-16 (5 mm x 5 mm)

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Vin (min) (V)	1.8
Vin (max) (V)	75
PoE current limit (min) (mA)	300
PoE inrush limit (mA) (typ)	Programmable
rDS(on) per FET (typ) (mΩ)	1000
PoE standards supported	802.3at Type 1 (802.3af)
PD power level	13W
DC/DC control	PD and DC/DC
Fault response	Thermal Cycling
Features	Error Amplifier, Programmable UVLO, Thermal shutdown
Operating temperature range (°C)	-40 to 125
Rating	Catalog