500mA, Low-Voltage Linear Regulator in Tiny DFN

The MAX1935 low-dropout linear regulator operates from a 2.25V to 5.5V supply and delivers a guaranteed 500mA load current with low 175mV dropout. The high-accuracy (±1.5%) output voltage is preset at an internally trimmed voltage or can be adjusted from 0.8V to 4.5V with an external resistive-divider.

An internal PMOS pass transistor allows low 210µA supply current, making this device ideal for portable equipment such as personal digital assistants (PDAs), cellular phones, cordless phones, and other equipment, including base stations and docking stations.

Other features include an active-low, power-OK output that indicates when the output is out of regulation, a 0.02µA shutdown mode, short-circuit protection, and thermal-shutdown protection. The MAX1935 comes in a tiny 1.9W, 8-pin 3mm x 3mm thin DFN package.

Applications

* Cell Phones/Cordless Phones * Docking Stations * Notebook Computers * Palmtop Computers * PDAs * USB Hubs * Wireless Base Stations

* Guaranteed 500mA Output Current

* Output Down to 0.8V

* Low 175mV Dropout at 500mA

* ±1.5% Output Voltage Accuracy

* Preset at 1.5V

* Adjustable from 0.8V to 4.5V

* Power-OK Output

* Low 210µA Ground Current

* 0.02µA Shutdown Current

* Thermal-Overload Protection

* Output Current Limit

* Tiny 1.9W, 8-Pin 3mm x 3mm Thin DFN Package