Datasheet ADP2441 (Analog Devices) - 7

Data Sheet ADP2441 TYPICAL PERFORMANCE CHARACTERISTICS 100 100 V 90 IN = 5V 90 VIN = 5V 80 80 70 VIN = 12V 70 VIN = 12V %) %) ( 60 ( 60 Y Y C VIN = 24V C V N IN = 24V 50 N IE 50 IE 40 FFIC 40 FFIC E E 30 VOUT = 3.3V 30 VOUT = 3.3V fSW = 300kHz fSW = 700kHz 20 COILCRAFT MSS1038 20 COILCRAFT MSS1038 10 10
004
0 0 0.01 0.1 1
005 10581-
0.01 0.1 1 LOAD (A) LOAD (A)
10581- Figure 4. Efficiency vs. Load Current, Figure 7. 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 Y IN = 36V ( 60 IN = 24V Y C C N V 50 N IN = 36V IE 50 IE 40 FFIC 40 E FFIC E 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
006
0.01 0.1 1
007
LOAD (A)
10581-
LOAD (A)
10581- Figure 5. Efficiency vs. Load Current, Figure 8. 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 %) Y ( 60 C Y N C 50 N IE 50 IE 40 FFIC 40 E FFIC E 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)
10581-
LOAD (A)
10581- Figure 6. Efficiency vs. Load Current, Figure 9. Efficiency vs. Load Current, VOUT = 12 V, fSW = 300 kHz VOUT = 12 V, fSW = 600 kHz Rev. C | Page 7 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