1

®

FN6867.1

ISL9021

Noise and High PSRR LDO

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

5m

Ω 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.

Pinouts

ISL9021

(6 LD 1.6x1.6 µTDFN)

TOP VIEW

ISL9021

(4 BALL 1.155x0.975 WLCSP)

TOP VIEW

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 5m

Ω 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

1

2

3

4

5

6

VIN

GND

NC

VO

NC

EN

VIN

EN

GND

VOUT

A1

B1

A2

B2

Datasheet

June 12, 2009

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

Copyright Intersil Americas Inc. 2009. All Rights Reserved

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