Datasheet ADP2441 (Analog Devices) - 8

ADP2441 Data Sheet 0.5 400 0.4 VIN = 12V 350 f V SW = 300kHz IN = 24V mA) ( 0.3 VIN = 36V NT 300 0.2 %) 0.1 250 R ( f AD CURRE SW = 700kHz 0 O RRO 200 E D L L UT –0.1 OV 150 V HO OUT = 5V S –0.2 fSW = 700kHz HRE 100 –0.3 T P KI –0.4 S 50 V P OUT = 3.3V –0.5 0 0 0.2 0.4 0.6 0.8 1.0
010
5 10 15 20 25 30 35 40
013
LOAD (A)
10581-
VIN (V)
10581- Figure 10. Load Regulation for Different Supplies Figure 13. Pulse Skip Threshold, VOUT = 3.3 V
1.0 300 0.8 f mA) SW = 300kHz ( 250 0.6 NT 0.4 TA = +25°C 200 %) 0.2 T R ( A = –40°C AD CURRE fSW = 700kHz 0 O RRO 150 E D L L UT –0.2 OV HO S 100 –0.4 T HRE –0.6 V A = +125°C IN = 24V T V P OUT = 5V 50 KI S –0.8 fSW = 700kHz P VOUT = 5V –1.0
1 1
0 0 0.2 0.4 0.6 0.8 1.0
0
10 15 20 25 30 35 40
014
LOAD (A)
10581-
VIN (V)
10581- Figure 11. Load Regulation for Different Temperatures Figure 14. Pulse Skip Threshold, VOUT = 5 V
0.5 300 0.4 mA) ( 250 0.3 NT fSW = 300kHz 0.2 LOAD = 500mA 200 %) 0.1 R ( AD CURRE O 0 RRO 150 E D L f L SW = 600kHz UT –0.1 LOAD = 1A OV HO S 100 –0.2 VIN = 24V VOUT = 5V HRE –0.3 f T SW = 700kHz P 50 KI S V –0.4 P OUT = 12V –0.5 0 7 12 17 22 27 32 37
012
15 20 25 30 35 40
015
VIN (V) V
10581-
IN (V)
10581- Figure 12. Line Regulation, VOUT = 5 V for Different Loads Figure 15. Pulse Skip Threshold, VOUT = 12 V Rev. C | Page 8 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