1

FN6867.2

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

January 14, 2010

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, 2010. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

NOT

RECO

MME

NDED

FOR

NEW

DESI

GNS

RECO

MME

NDED

REPL

ACEM

ENT

PART

ISL90

21A