Datasheet ADP124, ADP125 (Analog Devices) - 4

ADP124/ADP125 Data Sheet Parameter Symbol Test Conditions Min Typ Max Unit
OUTPUT NOISE OUTNOISE 10 Hz to 100 kHz, VIN = 5.5 V, VOUT = 1.2 V 25 µV rms 10 Hz to 100 kHz, VIN = 5.5 V, VOUT = 1.8 V 35 µV rms 10 Hz to 100 kHz, VIN = 5.5 V, VOUT = 2.5 V 45 µV rms 10 Hz to 100 kHz, VIN = 5.5 V, VOUT = 3.3 V 55 µV rms 10 Hz to 100 kHz, VIN = 5.5 V, VOUT = 4.2V 65 µV rms POWER SUPPLY REJECTION RATIO PSRR 10 kHz to 100 kHz, VOUT = 1.8 V, 2.5 V, 3.3 V 60 dB (VIN = VOUT +1V) 1 The current from the external resistor divider network in the case of adjustable voltage output (as with the ADP125) 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 500 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 3.3 V, or 2.97 V.
RECOMMENDED CAPACITOR SPECIFICATIONS Table 2. Parameter Symbol Test Conditions Min Typ Max Unit
Minimum Input and Output CAPMIN TA = −40°C to +125°C 0.70 µF Capacitance1 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 this LDO. Rev. D | Page 4 of 20 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUITS GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS RECOMMENDED CAPACITOR 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 PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE