Description

The YB1231 is a series of ultra-low-noise, low dropout (LDO) linear regulators with 2.0 output voltage accuracy. The YB1231 regulators achieve a low 440mV dropout at 600mA load current of 4.5V output and are available in voltages ranging from 3.2V to 4.5V with 0.1 V per step (custom voltage is considerable at request).

The YB1231 regulators are optimized to work with low-ESR and low cost ceramic capacitors, reducing the amount of board space critical in hand-held devices. The YB1231 requires only 2.2 μF output capacitor for stability with any load and consumes less than 1μA in shutdown mode.

Built-in thermal shutdown and short-circuit protect offer secure protection against fault operation. The YB1231 regulators are available in SOT-23 / SOT-25 / SOT-89 packages.

Features

■ 2.0 Accuracy Output Voltage

■ Output Voltage range 3.2V~4.5V

■ Low-Noise Low-Drop-Out

■ Stable with 2.2μF Ceramic Capacitor for Any Load

■ Typical Output Current : 600 mA

■ Low Quiescent Current : ~100μA

■ 440mV Dropout at 600mA Load (4.5V)

■ Only Need Input and Output Capacitors

■ Power Saving Shutdown Mode (<1μA)

■ Thermal Protection Shutdown

■ Built-In Internal Soft-Start

■ Output Short-circuit Current Limit Protection

■ Green package (RoHS) available

Applications

■ PDA, Palmtops and Notebook Computers

■ DSC, Handset Camera Modules

■ PCMCIA Cards, PC Cameras

■ USB Based Portable Devices (MP3, PMP)

■ GSM/GPRS/3G RF Transceiver Modules

■ Wireless LANs

■ Bluetooth Portable Radios