Over-Voltage Protection Switch with OCP and BOVP

Manufacturer's part number :


Manufacturer Skyworks


Description :

The AAT4685 OVPSwitch™ is a member of Skyworks' Application Specific Power MOSFET™ (ASPM™) product family. It is an N-channel MOSFET power switch with precise over-voltage protection control, designed to protect low-voltage systems against high-voltage faults up to +28V. It also integrates over-current protection (OCP), battery over-voltage protection (BOVP) and over temperature protection (OTP).

When the input voltage exceeds the programmed overvoltage threshold, the N-channel MOSFET switch will be turned off to prevent damage to the output load circuits. An external resistor divider is adopted to program the adjustable version over-voltage trip point. Over-current protection protects the case of output short circuits by disconnecting the load from the input supply.

A battery voltage monitor is integrated and disconnect the IN and OUT when the battery voltage exceed its rated voltage. The AAT4685 also monitors its own die temperature and OVP switch off if it becomes too hot.

The AAT4685 includes an under-voltage lockout (UVLO) protection circuit, which puts the device into sleep mode at low input voltages only consuming 100μA current. It also includes two indicators: input supply power good indicator (POK) which is always active whether EN is low or high, and a fault flag indicator (FLT) which goes to active low when a fault condition (OV, OC, BOV and OT) occurs at EN = low.

The AAT4685 is offered in a Pb-free, 3x3mm 12-pin TDFN package with a pin-out optimized for safety and is specified for operation over the -40°C to +85°C ambient temperature range.

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    • VIN Range: 3.0V 28V
    • OVP Threshold Setting Range: 4V 7V
    • Fixed: 5.85V and 6.8V
    • Adjustable
    • Fast OVP Response:
    • 1μs (max) Response to Over-Voltage Transient
    • OVP Recovery Delay Time: 8ms
    • Over-Current Protection
    • Adjustable 0.3 1.8A
    • Battery OVP 4.35V
    • Thermal Shutdown Protection
    • Low Quiescent Current
    • 600μA Typical
    • 100μA Typical Standby Current
    • Under-Voltage Lockout
    • 120mΩ Typical RDS(ON) at 5.0V
    • Active Low Enable with Internal 200kΩ Pull-Down
    • Resistor
    • Input Supply Power Good Indicator Open Drain
    • OVP/OCP/BOVP/OT Fault Indicator Open Drain
    • Temperature Range: -40°C to 85°C
    • 3x3mm TDFN-12 Package

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Fault Flag Yes  
Current Limit Threshold 1 A  
Typical Quiescent Current (µA) 600  
Typical On-Resistance (mΩ) 120  
Voltage In (V) 28  
Package (mm) TDFN33-12