Document
Data Sheet
Dual, 300 mA Output, Low Noise, High PSRR Voltage Regulators
ADP222/ADP223/ADP224/ADP225
09376-001
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 Low noise: 27 µV rms at VOUT = 1.2 V, 50 µV rms at VOUT = 2.8 V 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
VIN = 4.2V
+ C1
1µF
R1
ON OFF
ON OFF
1 EN1
ADJ1 8
ADP223/
ADP225
2 EN2
VOUT1 7
R2
VOUT1 = 2.0V + C2
1µF
3 GND
VIN 6
4 ADJ2
VOUT2 5
VOUT2 = 2.8V
R3
+ C3
1µF
R4
VIN = 4.2V + C1 1µF
ON OFF
ON OFF
Figure 1. ADP223/ADP225
1 EN1
SENSE1 8
ADP222/
ADP224
2 EN2
VOUT1 7
3 GND
VIN 6
4 SENSE2 VOUT2 5
VOUT1 = 1.5V + C2
1µF
VOUT2 = 3.3V + C3 1µF
09376-101
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
Figure 2. ADP222/ADP224
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.
Rev. E
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ADP222/ADP223/ADP224/ADP225
TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 Typical Application Circuits............................................................ 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3
Input and Output Capacitor, Recommended Specifications .. 4 Absolute Maximum Ratings............................................................ 5
Thermal Data ................................................................................ 5 Thermal Resistance ...................................................................... 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6
REVISION HISTORY
5/14—Rev. D to Rev. E Changes to Figure 1 .......................................................................... 1 Changes to Figure 64, VOUT1 Equation and Following Text ...... 17 Deleted Paralleling Outputs to Increase Output Current Section and Figure 70................................................................................... 19 Updated Outline Dimensions .......................................