Datasheet ADP5040 (Analog Devices) - 5

Data Sheet ADP5040 Parameter Symbol Conditions Min Typ Max Unit
POWER SUPPLY REJECTION PSRR 1 kHz, VIN2, VIN3 = 3.3 V, VOUT2, VOUT3 = 2.8 V, 66 dB RATIO IOUT = 100 mA 100 kHz, VIN2, VIN3 = 3.3 V, VOUT2, VOUT3 = 2.8 V, 57 dB IOUT = 100 mA 1 MHz, VIN2, VIN3 = 3.3 V, VOUT2, VOUT3 = 2.8 V, 60 dB IOUT = 100 mA 1 All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC). 2 This is the input current into VIN2 and VIN3, which is not delivered to the output load. 3 Based on an end-point 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 above 1.7 V. 5 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 4. Parameter Symbol Conditions Min Typ Max Unit
INPUT CAPACITANCE (BUCK)1 CMIN1 TJ = −40°C to +125°C 4.7 40 µF OUTPUT CAPACITANCE (BUCK)2 CMIN2 TJ = −40°C to +125°C 7 40 µF INPUT AND OUTPUT CAPACITANCE3 (LDO1, LDO2) CMIN34 TJ = −40°C to +125°C 0.70 µF CAPACITOR ESR RESR TJ = −40°C to +125°C 0.001 1 Ω 1 The minimum input capacitance should be greater than 4.7 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, whereas Y5V and Z5U capacitors are not recommended for use with the buck. 2 The minimum output capacitance should be greater than 7 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, whereas Y5V and Z5U capacitors are not recommended for use with the buck. 3 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, whereas Y5V and Z5U capacitors are not recommended for use with LDOs. Rev. C | Page 5 of 37 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS GENERAL SPECIFICATIONS BUCK SPECIFICATIONS LDO1, LDO2 SPECIFICATIONS INPUT AND OUTPUT CAPACITOR, RECOMMENDED SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION POWER MANAGEMENT UNIT Thermal Protection Undervoltage Lockout Enable/Shutdown Active Pull-Down BUCK SECTION Control Scheme PWM Mode Power Save Mode (PSM) PSM Current Threshold Short-Circuit Protection Soft Start Current Limit 100% Duty Operation LDO SECTION APPLICATIONS INFORMATION BUCK EXTERNAL COMPONENT SELECTION Feedback Resistors Inductor Output Capacitor Input Capacitor LDO EXTERNAL COMPONENT SELECTION Feedback Resistors Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties POWER DISSIPATION/THERMAL CONSIDERATIONS Buck Regulator Power Dissipation LDO Regulator Power Dissipation Junction Temperature APPLICATION DIAGRAM PCB LAYOUT GUIDELINES SUGGESTED LAYOUT BILL OF MATERIALS FACTORY PROGRAMMABLE OPTIONS OUTLINE DIMENSIONS ORDERING GUIDE