Datasheet ADP2442 (Analog Devices) - 8

ADP2442 Data Sheet EFFICIENCY IN PULSE SKIP MODE 100 100 90 VIN = 5V 90 VIN = 5V 80 80 70 VIN = 12V 70 VIN = 12V 60 60 CY (%) VIN = 24V CY (%) N VIN = 24V 50 N IE 50 IE 40 40 EFFIC EFFIC 30 VOUT = 3.3V 30 VOUT = 3.3V fSW = 300kHz fSW = 700kHz 20 COILCRAFT MSS1038 20 COILCRAFT MSS1038 10 10 0 0 0.01 0.1 1
004
0.01 0.1 1
005
LOAD (A)
10667-
LOAD (A)
10667- Figure 10. Efficiency vs. Load Current, Figure 13. Efficiency vs. Load Current, VOUT = 3.3 V, fSW = 300 kHz VOUT = 3.3 V, fSW = 700 kHz
100 100 90 VIN = 12V 90 VIN = 12V 80 80 70 VIN = 24V 70 60 V V IN = 36V 60 IN = 24V CY (%) N CY (%) 50 N VIN = 36V IE 50 IE 40 40 EFFIC EFFIC 30 VOUT = 5V 30 VOUT = 5V fSW = 300kHz fSW = 700kHz 20 COILCRAFT MSS1038 20 COILCRAFT MSS1038 10 10 0 0 0.01 0.1 1
256
0.01 0.1 1
007
LOAD (A)
10667-
LOAD (A)
10667- Figure 11. Efficiency vs. Load Current, Figure 14. Efficiency vs. Load Current, VOUT = 5 V, fSW = 300 kHz VOUT = 5 V, fSW = 700 kHz
100 100 90 VIN = 24V 90 VIN = 24V 80 80 70 VIN = 36V 70 VIN = 36V 60 60 CY (%) N CY (%) 50 N IE 50 IE 40 40 EFFIC EFFIC 30 VOUT = 12V 30 VOUT = 12V fSW = 300kHz fSW = 600kHz 20 COILCRAFT MSS1038 20 COILCRAFT MSS1038 10 10 0 0 0.01 0.1 1
008
0.01 0.1 1
009
LOAD (A)
10667-
LOAD (A)
10667- Figure 12. Efficiency vs. Load Current, Figure 15. Efficiency vs. Load Current, VOUT = 12 V, fSW = 300 kHz VOUT = 12 V, fSW = 600 kHz Rev. B | Page 8 of 36 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL CIRCUIT CONFIGURATION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS EFFICIENCY IN FORCED FIXED FREQUENCY MODE EFFICIENCY IN PULSE SKIP MODE INTERNAL BLOCK DIAGRAM THEORY OF OPERATION CONTROL ARCHITECURE Fixed Frequency Mode Pulse Skip Mode ADJUSTABLE FREQUENCY POWER GOOD MODE OF OPERATION EXTERNAL SYNCHRONIZATION SOFT START UNDERVOLTAGE LOCKOUT PRECISION ENABLE/SHUTDOWN CURRENT-LIMIT AND SHORT-CIRCUIT PROTECTION THERMAL SHUTDOWN APPLICATIONS INFORMATION ADIsimPOWER DESIGN TOOL SELECTING THE OUTPUT VOLTAGE SETTING THE SWITCHING FREQUENCY EXTERNAL COMPONENT 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 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