Datasheet ADP222, ADP223, ADP224, ADP225 (Analog Devices)

Dual, 300 mA Output, Low Noise, High PSRR Voltage Regulators Data Sheet ADP222/ ADP223/ ADP224/ ADP225 FEATURES TYPICAL APPLICATION CIRCUITS Input voltage range: 2.5 V to 5.5 V VIN = 4.2V Small, 8-lead, 2 mm × 2 mm LFCSP package + C1 1µF R1 Initial accuracy: ±1% ON High PSRR: 70 dB at 10 kHz, 60 dB at 100 kHz, 40 dB at 1 MHz OFF R2 1 EN1 8 ADJ1 Low noise: 27 µV rms at VOUT = 1.2 V, 50 µV rms at VOUT = 2.8 V ON ADP223/ Excellent transient response OFF ADP225 VOUT1 = 2.0V 2 EN2 VOUT1 7 Low dropout voltage: 170 mV at 300 mA load + C2 1µF 65 µA typical ground current at no load, both LDOs enabled 3 GND VIN 6 Fixed output voltage from 0.8 V to 3.3 V (ADP222/ ADP224) VOUT2 = 2.8V Adjustable output voltage range from 0.5 V to 5.0 V 4 ADJ2 VOUT2 5 + C3 (ADP223/ ADP225) R3 1µF Quick output discharge (QOD)—ADP224/ ADP225 R4
001
Overcurrent and thermal protection
09376- Figure 1. ADP223/ADP225
APPLICATIONS VIN = 4.2V Portable and battery-powered equipment + C1 Portable medical devices 1µF Post dc-to-dc regulation ON OFF Point of sale terminals 1 EN1 8 SENSE1 ON ADP222/ Credit card readers OFF ADP224 VOUT1 = 1.5V Automatic meter readers 2 EN2 VOUT1 7 + C2 Wireless network equipment 1µF 3 GND VIN 6 VOUT2 = 3.3V 4 SENSE2 VOUT2 5 + C3 1µF
101 09376- Figure 2. ADP222/ADP224
GENERAL DESCRIPTION
The 300 mA, adjustable dual output ADP223/ADP225 and 100 kHz while operating with a low headroom voltage. The fixed dual output ADP222/ADP224 combine high PSRR, low ADP222/ADP223/ADP224/ADP225 offer much lower noise noise, low quiescent current, and low dropout voltage in a performance than competing LDOs without the need for a voltage regulator that is ideally suited for wireless applications noise bypass capacitor. Overcurrent and thermal protection with demanding performance and board space requirements. circuitry prevent damage in adverse conditions. The ADP222/ADP224 are available with fixed outputs voltages The ADP224 and ADP225 are identical to the ADP222 and from 0.8V to 3.3V. The adjustable output ADP223/ADP225 may ADP223, respectively, but with the addition of a quick output be set to output voltages from 0.5 V to 5.0 V. The low quiescent discharge (QOD) feature. current, low dropout voltage, and wide input voltage range of The ADP222/ADP223/ADP224/ADP225 are available in a the ADP222/ADP223/ADP224/ADP225 extend the battery life small 8-lead, 2 mm × 2 mm LFCSP package and are stable with of portable devices. tiny 1 µF, ±30% ceramic output capacitors, resulting in the smallest The ADP222/ADP223/ADP224/ADP225 maintain power possible board area for a wide variety of portable power needs. supply rejection greater than 60 dB for frequencies as high as
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Document Outline Features Applications Typical Application Circuits General Description Table of Contents Revision History Specifications Input and Output Capacitor, Recommended Specifications Absolute Maximum Ratings Thermal Data Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Applications Information Capacitor Selection Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties Enable Feature Quick Output Discharge (QOD) Function Current Limit and Thermal Overload Protection Thermal Considerations Printed Circuit Board Layout Considerations Outline Dimensions Ordering Guide