LTC4361-1/LTC4361-2 - Overvoltage/Overcurrent Protection Controller

The LTC4361 overvoltage/overcurrent protection controller safeguards 2.5V to 5.5V systems from input supply overvoltage. It is designed for portable devices with multiple power supply options including wall adaptors, car battery adaptors and USB ports.

The LTC4361 controls an external N-channel MOSFET in series with the input power supply. During overvoltage transients, the LTC4361 turns off the MOSFET within 1μs, isolating downstream components from the input supply. Inductive cable transients are absorbed by the MOSFET and load capacitance. In most applications, the LTC4361 provides protection from transients up to 80V without requiring transient voltage suppressors or other external components.

The LTC4361 has a delayed start-up and adjustable dV/dt ramp-up for inrush current limiting. A PWRGD pin provides power good monitoring for VIN. The LTC4361 features a soft shutdown controlled by the ON pin and drives an optional external P-channel MOSFET for negative voltage protection. Following an overvoltage condition, the LTC4361 automatically restarts with a start-up delay. After an overcurrent fault, the LTC4361-1 remains off while the LTC4361-2 automatically restarts after a 130ms start-up delay.

Features

2.5V to 5.5V Operation
Overvoltage Protection Up to 80V
No Input Capacitor or TVS Required for Most Applications
2% Accurate 5.8V Overvoltage Threshold
10% Accurate 50mV Overcurrent Circuit Breaker
<1μs Overvoltage Turn-Off, Gentle Shutdown
Controls N-Channel MOSFET
Adjustable Power-Up dV/dt Limits Inrush Current
Reverse Voltage Protection
Power Good Output
Low Current Shutdown
Latchoff (LTC4361-1) or Auto-Retry (LTC4361-2) After Overcurrent
Available in 8-Lead ThinSOT™ and 8-Lead (2mm × 2mm) DFN Packages

Typical Application

Applications

USB Protection
Handheld Computers
Cell/Smart Phones
MP3/MP4 Players
Digital Cameras

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC4361CDC-1#PBF	2x2 DFN-8	C	$2.00
LTC4361CDC-1#TRMPBF	2x2 DFN-8	C	$2.00	$1.45
LTC4361CDC-1#TRPBF	2x2 DFN-8	C	$2.00	$1.40
LTC4361CDC-2#PBF	2x2 DFN-8	C	$2.00
LTC4361CDC-2#TRMPBF	2x2 DFN-8	C	$2.00	$1.45
LTC4361CDC-2#TRPBF	2x2 DFN-8	C	$2.00	$1.40
LTC4361CTS8-1#PBF	SOT-23	C	$2.00
LTC4361CTS8-1#TRMPBF	SOT-23	C	$2.00	$1.45
LTC4361CTS8-1#TRPBF	SOT-23	C	$2.00	$1.40
LTC4361CTS8-2#PBF	SOT-23	C	$2.00
LTC4361CTS8-2#TRMPBF	SOT-23	C	$2.00	$1.45
LTC4361CTS8-2#TRPBF	SOT-23	C	$2.00	$1.40
LTC4361HDC-1#PBF	2x2 DFN-8	H	$2.53
LTC4361HDC-1#TRMPBF	2x2 DFN-8	H	$2.53	$1.82
LTC4361HDC-1#TRPBF	2x2 DFN-8	H	$2.53	$1.77
LTC4361HDC-2#PBF	2x2 DFN-8	H	$2.53
LTC4361HDC-2#TRMPBF	2x2 DFN-8	H	$2.53	$1.82
LTC4361HDC-2#TRPBF	2x2 DFN-8	H	$2.53	$1.77
LTC4361HTS8-1#PBF	SOT-23	H	$2.53
LTC4361HTS8-1#TRMPBF	SOT-23	H	$2.53	$1.82
LTC4361HTS8-1#TRPBF	SOT-23	H	$2.53	$1.77
LTC4361HTS8-2#PBF	SOT-23	H	$2.53
LTC4361HTS8-2#TRMPBF	SOT-23	H	$2.53	$1.82
LTC4361HTS8-2#TRPBF	SOT-23	H	$2.53	$1.77
LTC4361IDC-1#PBF	2x2 DFN-8	I	$2.20
LTC4361IDC-1#TRMPBF	2x2 DFN-8	I	$2.20	$1.59
LTC4361IDC-1#TRPBF	2x2 DFN-8	I	$2.20	$1.54
LTC4361IDC-2#PBF	2x2 DFN-8	I	$2.20
LTC4361IDC-2#TRMPBF	2x2 DFN-8	I	$2.20	$1.59
LTC4361IDC-2#TRPBF	2x2 DFN-8	I	$2.20	$1.54
LTC4361ITS8-1#PBF	SOT-23	I	$2.20
LTC4361ITS8-1#TRMPBF	SOT-23	I	$2.20	$1.59
LTC4361ITS8-1#TRPBF	SOT-23	I	$2.20	$1.54
LTC4361ITS8-2#PBF	SOT-23	I	$2.20
LTC4361ITS8-2#TRMPBF	SOT-23	I	$2.20	$1.59
LTC4361ITS8-2#TRPBF	SOT-23	I	$2.20	$1.54

Demo Boards


Part Number	Description	Price
DC1506A	LTC4361-1/LTC4361-2 Overvoltage/Overcurrent Protection Controller with Latchoff/Auto-Retry	$50.00

Datasheet

LTC4361-1/LTC4361-2 - Overvoltage/Overcurrent Protection Controller

Reliability Data

R535 Reliability Data

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