Dual, 300 mA Output, Low Noise,

High PSRR Voltage Regulators

Data Sheet

ADP222/ADP223/ADP224/ADP225

Rev. B

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FEATURES

Input voltage range: 2.5 V to 5.5 V

Small, 8-lead, 2 mm × 2 mm LFCSP package

Initial accuracy: ±1%

High PSRR: 70 dB at 10 kHz, 60 dB at 100 kHz, 40 dB at 1 MHz

Excellent transient response

Low dropout voltage: 170 mV at 300 mA load

65 µA typical ground current at no load, both LDOs enabled

Fixed output voltage from 0.8 V to 3.3 V (ADP222/ADP224)

Adjustable output voltage range from 0.5 V to 5.0 V

(ADP223/ADP225)

Quick output discharge (QOD)—ADP224/ADP225

Overcurrent and thermal protection

APPLICATIONS

Portable and battery-powered equipment

Portable medical devices

Post dc-to-dc regulation

Point of sale terminals

Credit card readers

Automatic meter readers

Wireless network equipment

TYPICAL APPLICATION CIRCUITS

EN1

VOUT1

VIN

EN2

GND

6

4

3

2

ADJ2

VOUT2

1

8

5

7

ADJ1

ADP223/

ADP225

R1

R4

R2

ON

OFF

ON

OFF

+ C1

1µF

+ C3

1µF

+ C2

1µF

VOUT1 = 2.8V

VOUT2 = 2.0V

R3

Figure 1. ADP223/ADP225

EN1

VOUT1

VIN

EN2

GND

6

4

3

2

SENSE2

VOUT2

1

8

5

7

SENSE1

ADP222/

ADP224

ON

OFF

ON

OFF

+ C1

1µF

+ C3

1µF

+ C2

1µF

VOUT2 = 3.3V

VOUT1 = 1.5V

Figure 2. ADP222/ADP224

GENERAL DESCRIPTION

The 300 mA, adjustable dual output ADP223/ADP225 and

fixed dual output ADP222/ADP224 combine high PSRR, low

noise, low quiescent current, and low dropout voltage in a

voltage regulator that is ideally suited for wireless applications

with demanding performance and board space requirements.

The ADP222/ADP224 are available with fixed outputs voltages

from 0.8V to 3.3V. The adjustable output ADP223/ADP225 may

be set to output voltages from 0.5 V to 5.0 V. The low quiescent

current, low dropout voltage, and wide input voltage range of

the ADP222/ADP223/ADP224/ADP225 extend the battery life

of portable devices.

The ADP222/ADP223/ADP224/ADP225 maintain power

supply rejection greater than 60 dB for frequencies as high as

100 kHz while operating with a low headroom voltage. The

ADP222/ADP223/ADP224/ADP225 offer much lower noise

performance than competing LDOs without the need for a

noise bypass capacitor. Overcurrent and thermal protection

circuitry prevent damage in adverse conditions.

The ADP224 and ADP225 are identical to the ADP222 and

ADP223, respectively, but with the addition of a quick output

discharge (QOD) feature.

The ADP222/ADP223/ADP224/ADP225 are available in a

small 8-lead, 2 mm × 2 mm LFCSP package and are stable with

tiny 1 µF, ±30% ceramic output capacitors, resulting in the smallest

possible board area for a wide variety of portable power needs.