Datasheet ADP2441 (Analog Devices) - 9

Data Sheet ADP2441 12 2.25 2.05 V 10 IN = 36V 1.85 A) µ 1.65 mA) ( ( 8 NT NT 1.45 1.25 VIN = 4.5V 6 N CURE CURRE VIN = 12V Y 1.05 W L VIN = 24V DO PP 0.85 VIN = 36V 4 HUT 0.65 S VIN = 4.5V SU 0.45 2 0.25 0 0.05 –50 0 50 100 150
017
–50 –30 –10 10 30 50 70 90 110 130 150
016
TEMPERATURE (°C) TEMPERATURE (°C)
10581- 10581- Figure 16. Shutdown Current vs. Temperature Figure 19. Supply Current vs. Temperature
4.5 1.24 1.22 4.4 ENABLE RISING THRESHOLD 1.20 ) V 1.18 D ( 4.3 UVLO, RISING VIN E (V) L G 1.16 A HO S LT 4.2 O 1.14 V HRE E T 1.12 O L ENABLE FALLING THRESHOLD 4.1 NABL E 1.10 UV UVLO, FALLING VIN 1.08 4.0 1.06
018 10581-
1.04 3.9 –50 –30 –10 10 30 50 70 90 110 130 150
019
–50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C)
10581- Figure 17. UVLO Threshold vs. Temperature Figure 20. Enable Threshold vs. Temperature
0.7 130 0.6 120 0.5 %) 110 D ( L 0.4 HO 100 S (V) B F HRE 0.3 90 D T O O 0.2 G 80 P PGOOD FALL, FB INCREASING PGOOD RISE, FB DECREASING 0.1 70 PGOOD RISE, FB INCREASING PGOOD FALL, FB DECREASING 0 60
18
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
1
–50 –30 –10 10 30 50 70 90 110 130 150
021
TRACK (V)
10581-
TEMPERATURE (°C)
10581- Figure 18. Tracking Range Figure 21. PGOOD Threshold vs. Temperature Rev. C | Page 9 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