Date: 12th Sept 08
New over-voltage
protectors MAX4978 and MAX4981with active current limiting
from MAXIM
Maxim Integrated Products introduced two new ICs MAX4978
& MAX4981 termed as over-voltage protectors with active
current limiting. Designed to protect the charger input
port of portable devices, these devices are ideal for cell
phones, MP3 players, digital still cameras (DSCs), and PDAs.
They protect low-voltage systems against voltage faults
up to 28V with customer-selectable 5.7V and 6.8V threshold
options. The active current limiter provides a second layer
of defense for the protected device and is available in
0.9A and 1.95A threshold options.
Some of the other features include:
1. Provides ±15kV ESD input protection when a 1µF
ceramic capacitor is connected from VIN to ground.
2. Extended temperature range of -40°C to +85°C
3. Include battery-overcharge protection, which monitors
the voltage on the Li-ion battery being charged.
4. Once this monitored voltage reaches 4.4V, the switch
is disconnected automatically to avoid overcharging.
Package: lead-free TDFN with an exposed pad
Prices: start at $1.47 for 1K pieces of quantity
For further details visit: www.maxim-ic.com
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