LDOs Suit Automotive Applications

Jan 10, 2007 2:49 PM

Maxim Integrated Products’ MAX15006/MAX15007 low-dropout (LDO) linear regulators are designed for harsh automotive environments. The regulators can operate from a cold-crank voltage as low as 4 V and withstand load-dump transients as high as 45 V. Both devices deliver up to 50 mA of output current and have an ultra-low 10 μA (typ) quiescent current at no load.

An internal p-channel pass transistor keeps the quiescent current as low as 90 μA (typ), even with a 50-mA load. Additionally, the MAX15007 consumes only 3 μA of quiescent current in shutdown. The ultra-low quiescent current of these devices makes them ideal for use in battery-operated systems and "always-on" automotive applications.

The output of each regulator can be shorted to ground for an indefinite duration, even with an input voltage as high as 40 V. In addition, both devices include thermal shutdown to protect the devices from excessive temperatures at the die.

The regulators are specified for operation over the -40°C to +125°C automotive temperature range and are available in 3.3-V or 5-V output versions. These devices are packaged in a 3-mm x 3-mm thermally enhanced 6-pin TDFN, or a thermally enhanced 8-pin SO packages capable of dissipating 1.9 W and 1.86 W, respectively, at an ambient temperature of 70°C. Prices start at $0.50 for 1000 pieces.