Datasheet ADP2441 (Analog Devices) - 4

ADP2441 Data Sheet Parameter Symbol Test Conditions/Comments Min Typ Max Unit
POWER GOOD PGOOD High, FB Rising Threshold5 89 92 95 % PGOOD Low, FB Rising Threshold5 111 115 118 % PGOOD High, FB Falling Threshold5 106 109 112 % PGOOD Low, FB Falling Threshold5 83 86 89 % PGOOD Delay tPGOOD 50 µs High Leakage Current IPGOOD(SRC) VPGOOD = VCC 1 10 µA Pull-Down Resistor IPGOOD(SNK) FB = 0 V 0.5 0.7 kΩ TRK TRK Input Voltage Range 0 600 mV TRK to FB Offset Voltage TRK = 0 mV to 500 mV 10 mV 1 Guaranteed by design. 2 Measured between VIN and SW pins—includes bond wires and pin resistance. 3 Based on bench characterization. Measured with VIN = 12 V, VOUT = 1.2 V, load = 1 A, fSW = 1 MHz, and the output in regulation. Measurement does not include dead time. 4 Based on bench characterization. Measured with VIN = 15 V, VOUT = 12 V, load = 1 A, fSW = 600 kHz, and the output in regulation. Measurement does not include dead time. 5 This threshold is expressed as a percentage of the nominal output voltage. Rev. C | Page 4 of 32 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL CIRCUIT CONFIGURATION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS INTERNAL BLOCK DIAGRAM THEORY OF OPERATION CONTROL ARCHITECURE Fixed Frequency Mode Pulse Skip Mode ADJUSTABLE FREQUENCY POWER GOOD SOFT START TRACKING Coincident Tracking Ratiometric Tracking UNDERVOLTAGE LOCKOUT (UVLO) PRECISION ENABLE/SHUTDOWN CURRENT-LIMIT AND SHORT-CIRCUIT PROTECTION THERMAL SHUTDOWN APPLICATIONS INFORMATION SELECTING THE OUTPUT VOLTAGE SETTING THE SWITCHING FREQUENCY SOFT START EXTERNAL COMPONENTS SELECTION Input Capacitor Selection Inductor Selection Output Capacitor Selection BOOST CAPACITOR VCC CAPACITOR LOOP COMPENSATION LARGE SIGNAL ANALYSIS OF THE LOOP COMPENSATION DESIGN EXAMPLE CONFIGURATION AND COMPONENTS SELECTION Resistor Divider Switching Frequency Soft Start Capacitor Inductor Selection Input Capacitor Selection Output Capacitor Selection Compensation Selection SYSTEM CONFIGURATION TYPICAL APPLICATION CIRCUITS DESIGN EXAMPLE OTHER TYPICAL CIRCUIT CONFIGURATIONS POWER DISSIPATION AND THERMAL CONSIDERATIONS POWER DISSIPATION Inductor Losses Power Switch Conduction Losses Switching Losses Transition Losses THERMAL CONSIDERATIONS EVALUATION BOARD THERMAL PERFORMANCE CIRCUIT BOARD LAYOUT RECOMMENDATIONS OUTLINE DIMENSIONS ORDERING GUIDE