Datasheet ADP170, ADP171 (Analog Devices) - 4

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ADP170/ADP171 Data Sheet Parameter Symbol Conditions Min Typ Max Unit
OUTPUT NOISE OUTNOISE 10 Hz to 100 kHz, VIN = 3.6 V, VOUT = 3.0 V 72 µV rms 10 Hz to 100 kHz, VIN = 3.6 V, VOUT = 1.8 V 50 µV rms 10 Hz to 100 kHz, VIN = 3.6 V, VOUT = 1.2 V 40 µV rms 10 Hz to 100 kHz, VIN = 3.6 V, VOUT = 0.8 V 30 µV rms POWER SUPPLY REJECTION RATIO PSRR 1 kHz, VIN = 3.6 V, IOUT = 10 mA, VOUT = 0.8 V 73 dB 10 kHz, VIN = 3.6 V, IOUT = 10 mA, VOUT = 0.8 V 70 dB 10 kHz, VIN = (VOUT + 1 V), IOUT = 10 mA to 300 mA 50 dB 100 kHz, VIN = (VOUT + 1 V), IOUT = 10 mA to 300 mA 47 dB 1 The current from the external resistor divider network in the case of adjustable voltage output (as with the ADP171) should be subtracted from the ground current measured. 2 Accuracy when VOUT is connected directly to ADJ. When the VOUT voltage is set by external feedback resistors, the absolute accuracy in adjust mode depends on the tolerances of resistors used. 3 Based on an end-point calculation using 1 mA and 300 mA loads. See Figure 6 for typical load regulation performance for loads less than 1 mA. 4 Applies only for output voltages above 1.6 V. Dropout voltage is defined as the input-to-output voltage differential when the input voltage is set to the nominal output voltage. 5 Start-up time is defined as the time between the rising edge of EN and 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 3.0 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 CMIN TJ = −40°C to +125°C 0.45 µF CAPACITANCE1 CAPACITOR ESR RESR TJ = −40°C to +125°C 0.001 1 Ω 1 The minimum input and output capacitance should be greater than 0.45 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. C | 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 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 Printed Circuit Board Layout Considerations Outline Dimensions Ordering Guide