Datasheet ADP122, ADP123 (Analog Devices) - 4

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ADP122/ADP123 Data Sheet Parameter Symbol Test Conditions Min Typ Max Unit
OUTPUT NOISE OUT 10 Hz to 100 kHz, V = 5.5 V, V = 1.2 V 25 µV rms NOISE IN OUT 10 Hz to 100 kHz, V = 5.5 V, V = 1.8 V 35 µV rms IN OUT 10 Hz to 100 kHz, V = 5.5 V, V = 2.5 V 45 µV rms IN OUT 10 Hz to 100 kHz, V = 5.5 V, V = 3.3 V 55 µV rms IN OUT 10 Hz to 100 kHz, V = 5.5 V, V = 4.2 V 65 µV rms IN OUT POWER SUPPLY REJECTION RATIO PSRR 10 kHz, V = 3.3 V 60 dB OUT (V = V + 0.5 V) 10 kHz, V = 2.5 V 60 dB IN OUT OUT 10 kHz, V = 1.8 V 60 dB OUT 100 kHz, V = 3.3 V 60 dB OUT 100 kHz, V = 2.5 V 60 dB OUT 100 kHz, V = 1.8 V 60 dB OUT 1 The current from the external resistor divider network in the case of adjustable voltage output (as with the ADP123) should be subtracted from the ground current measured. 2 Accuracy when VOUT is connected directly to ADJ. When VOUT voltage is set by external feedback resistors, absolute accuracy in adjust mode depends on the tolerances of the resistors used. 3 Based on an endpoint calculation using 1 mA and 300 mA loads. 4 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 greater than 2.3 V. 5 Start-up time is defined as the time between the rising edge of EN to VOUT being at 90% of its nominal value. 6 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 3.3 V output voltage is defined as the current that causes the output voltage to drop to 90% of 3.3V, or 2.97 V.
RECOMMENDED SPECIFICATIONS Table 2. Parameter Symbol Test Conditions Min Typ Max Unit
Minimum Input and Output CAP T = −40°C to +125°C 0.70 µF MIN A Capacitance1 Capacitor ESR R T = −40°C to +125°C 0.001 1 Ω ESR A 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 any LDO. Rev. E | Page 4 of 24 Document Outline Features Applications General Description Typical Application Circuits Revision History Specifications Recommended Specifications Absolute Maximum Ratings Thermal Data Thermal Resistance ESD Caution Pin Configurations 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 Junction Temperature Calculations For TSOT Package Junction Temperature Calculations For LFCSP Package Printed Circuit Board Layout Considerations Outline Dimensions Ordering Guide