FN9217 Rev 4.00

Page 1 of 11

March 11, 2008

FN9217

Rev 4.00

March 11, 2008

ISL9000

Dual LDO with Low Noise, Very High PSRR and Low IQ

DATASHEET

ISL9000 is a high performance dual LDO capable of

sourcing 300mA current from each output. It has a low

standby current and very high PSRR and is stable with

output capacitance of 1µF to 10µF with ESR of up to 200m

.

The device integrates an individual Power-On-Reset (POR)

function for each output. The POR delay for VO2 can be

externally programmed by connecting a timing capacitor to

the CPOR pin. The POR delay for VO1 is internally fixed at

approximately 2ms. A reference bypass pin is also provided

for connecting a noise filtering capacitor for low noise and

high-PSRR applications.

The quiescent current is typically only 42µA with both LDOs

enabled and active. Separate enable pins control each

individual LDO output. When both enable pins are low, the

device is in shutdown, typically drawing less than 0.1µA.

Several combinations of voltage outputs are standard.

Output voltage options for each LDO range are from 1.5V to

3.3V. Other output voltage options may be available upon

request.

Pinout

ISL9000

(10 LD 3X3 DFN)

TOP VIEW

Features

• Integrates two 300mA high performance LDOs

• Excellent transient response to large current steps

• ±1.8% accuracy over all operating conditions

• Excellent load regulation:

< 0.1% voltage change across full range of load current

• Very high PSRR: 90dB @ 1kHz

• Extremely low quiescent current: 42µA (both LDOs active)

• Wide input voltage capability: 2.3V to 6.5V

• Low dropout voltage: typically 200mV @ 300mA

• Stable with 1µF to 10µF ceramic capacitors

• Separate enable and POR pins for each LDO

• Soft-start and staged turn-on to limit input current surge

during enable

• Current limit and overheat protection

• Tiny 10 Ld 3mmx3mm DFN package

• -40°C to +85°C operating temperature range

• Pb-free (RoHS compliant)

Applications

• PDAs, Cell Phones and Smart Phones

• Portable Instruments, MP3 Players

• Handheld Devices including Medical Handhelds

VIN

EN1

EN2

CBYP

CPOR

VO1

VO2

POR2

POR1

GND

2

3

4

1

5

9

8

7

10

6

NOT RECOMM

ENDED FOR N

EW DESIGNS

RECOMMEND

ED REPLACE

MENT PART

ISL9000A