Datasheet ADM7172 (Analog Devices) - 4

ADM7172 Data Sheet Parameter Symbol Test Conditions/Comments Min Typ Max Unit
EN INPUT STANDBY 2.3 V ≤ VIN ≤ 6.5 V EN Input Logic High ENSTBY-HIGH 1.1 V EN Input Logic Low ENSTBY-LOW 0.4 V EN Input Logic Hysteresis ENSTBY-HYS 80 mV EN INPUT PRECISION 2.3 V ≤ VIN ≤ 6.5 V EN Input Logic High ENHIGH 1.11 1.2 1.27 V EN Input Logic Low ENLOW 1.01 1.1 1.16 V EN Input Logic Hysteresis ENHYS 100 mV EN Input Leakage Current IEN-LKG EN = VIN or GND 0.1 1.0 µA EN Input Delay Time TIEN-DLY From EN rising from 0 V to VIN to 0.1 V × VOUT 130 μs 1 Dropout voltage is defined as the input-to-output voltage differential when the input voltage is set to the nominal output voltage. Dropout applies only for output voltages greater than 2.3 V. 2 Start-up time is defined as the time between the rising edge of EN to VOUT being at 90% of its nominal value. 3 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 5.0 V output voltage is defined as the current that causes the output voltage to drop to 90% of 5.0 V, or 4.5 V.
INPUT AND OUTPUT CAPACITOR, RECOMMENDED SPECIFICATIONS Table 3. Parameter Symbol Test Conditions/Comments Min Typ Max Unit
MINIMUM INPUT AND OUTPUT CAPACITANCE1 CMIN TA = −40°C to +125°C 3.3 µF CAPACITOR ESR RESR TA = −40°C to +125°C 0.001 0.05 Ω 1 Ensure that the minimum input and output capacitance is greater than 3.3 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. D | Page 4 of 23 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION 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 ADISIMPOWER DESIGN TOOL CAPACITOR SELECTION Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties PROGRAMMABLE PRECISION ENABLE UNDERVOLTAGE LOCKOUT SOFT START NOISE REDUCTION OF THE ADM7172 IN ADJUSTABLE MODE EFFECT OF NOISE REDUCTION ON START-UP TIME CURRENT-LIMIT AND THERMAL OVERLOAD PROTECTION THERMAL CONSIDERATIONS TYPICAL APPLICATIONS CIRCUITS PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE