AnalogicTech Adds OVP Switch For Protection Of Battery-Operated Consumer Devices
Advanced Analogic Technologies Inc. (AnalogicTech) announced the first in a new family of new Over-Voltage Protection (OVP) devices for portable applications. Offering highly precise over-voltage protection control, the AAT4684, switch protects low-voltage systems against high-voltage spikes up to 28V from a power line surge or using the wrong charger while offering a low RDS(ON) of just 100mΩ typical at 4.5V.
"The growing number of battery-operated devices found in households has created the potential for users to mistakenly use the wrong ac adapter when recharging their mobile phones, MP3 players, or camcorders," said Siamak Bastami, Product Line Director for AnalogicTech. "When device builders insert the AAT4684 OVP IC in the charging path, their users can be sure that their equipment will be protected from excessive voltage."
The OVP protection IC uses a P-channel MOSFET power switch to break the connection between the charger adapter and the battery charger when the input voltage exceeds a preset level. Designers can use the device with either an internally programmed over-voltage trip point or an adjustable protection threshold programmed by two external resistors. OVP response is a fast 1 µs maximum.
The device’s performance specifications are a product of AnalogicTech’s ModularBCD process technology, a proprietary high-voltage process which uses a modern, low-temperature CMOS-like manufacturing flow capable of high yields without sacrificing device performance or electrical isolation.
The AAT4684 also features an under-voltage lockout (UVLO) protection circuit which places the device into sleep mode at input voltages consuming < 1µA. Quiescent current for the AAT4684 is only 30µA typical.
Qualified across the -40 to +85 C temperature range, the AAT4684 is available in a Pb-free, 12-pin TSOPJW package.
