Datasheet ADP220, ADP221 (Analog Devices) - 4

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ADP220/ADP221 Data Sheet Parameter Symbol Conditions Min Typ Max Unit
POWER SUPPLY REJECTION RATIO PSRR VIN = 2.5 V, VOUT = 0.8 V, IOUT = 100 mA 100 Hz 76 dB 1 kHz 76 dB 10 kHz 70 dB 100 kHz 60 dB 1 MHz 40 dB VIN = 3.8 V, VOUT = 2.8 V, IOUT = 100 mA 100 Hz 68 dB 1 kHz 68 dB 10 kHz 68 dB 100 kHz 60 dB 1 MHz 40 dB 1 Based on an end-point calculation using 1 mA and 200 mA loads. 2 Dropout voltage is defined as the input-to-output voltage differential when the input voltage is set to the nominal output voltage. This applies only for output voltages above 2.5 V. 3 Start-up time is defined as the time between the rising edge of ENx to VOUTx being at 90% of its nominal value. 4 Current-limit threshold is defined as the current at which the output voltage drops to 90% of the specified typical value. For example, the current limit for a 3.0 V output voltage is defined as the current that causes the output voltage to drop to 90% of 3.0 V, or 2.7 V.
INPUT AND OUTPUT CAPACITOR, RECOMMENDED SPECIFICATIONS Table 2. Parameter Symbol Conditions Min Typ Max Unit
MINIMUM INPUT AND OUTPUT CAPACITANCE1 CMIN TA = −40°C to +125°C 0.70 µF CAPACITOR ESR RESR TA = −40°C to +125°C 0.001 1 Ω 1 The minimum input and output capacitance should be greater than 0.70 µF over the full range of operating conditions. The full range of operating conditions in the application must be considered during device selection to ensure that the minimum capacitance specification is met. X7R and X5R type capacitors are recommended; Y5V and Z5U capacitors are not recommended for use with LDOs. Rev. H | Page 4 of 20 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 Undervoltage Lockout Enable Feature Current-Limit and Thermal Overload Protection Thermal Considerations Printed Circuit Board (PCB) Layout Considerations Outline Dimensions Ordering Guide