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The ISL9021 is a single LDO providing high performance

low input voltage, high PSRR. It delivers guaranteed

continuous 250mA load current and is stable with 1μF to

4.7μF of output capacitance (±30) with an ESR range of

5mΩ to 400mΩ.

The input voltage range for the ISL9021 is between 1.5V to

5.5V and the output voltage comes in many fixed voltage

options with ±1.8 accuracy over temperature, line and load

ranges. Other output voltage within the range of 0.9V to 3.3V

may be available upon request. The ISL9021 has typical

PSRR of 75dB @ 10kHz and 50dB @ 1MHz.

The reverse current protection feature prevents current from

flowing back to the power source when the output voltage is

pulled higher than the input.

The ISL9021 is offered in tiny 4-bump 1.155mmx0.975mm

WLCSP and 1.6mmx1.6mm 6 Ld μTDFN packages.

Features

? High Performance LDO with 250mA guaranteed

continuous output current

? Input Voltage Range: 1.5V to 5.5V

? Output Voltage Range: 0.9V to 3.3V

? High PSRR: 75dB @ 10kHz, 50dB @ 1MHz

? Low Quiescent Current: 35μA

? Dropout Voltage: <150mV @ 250mA

? Stable with 1μF to 4.7μF Output Capacitance (±30) with

an ESR range of 5mΩ to 400mΩ

? ±1.8 Output Accuracy Over-Temperature/Load/Line

? Soft-start Limits Input Current Surge During Enable

? Current Limit and Overheat Protection

? -40°C to +85°C Operating Temperature Range

? Available in 1.155mmx0.975mm 4-bump WLCSP

Package and 1.6mmx1.6mm 6 Ld μTDFN

? Pb-free (RoHS compliant)

Applications

? PDAs, Cell Phones and Smart Phones

? Portable Instruments, MP3 Players

? Handheld Devices including Medical Handhelds