Datasheet ADP2442 (Analog Devices) - 10

ADP2442 Data Sheet 12 1.24 1.22 10 VIN = 36V ENABLE RISING THRESHOLD 1.20 (µA) 1.18 8 NT E (V) G 1.16 A LT 6 O N CURE 1.14 W E V 1.12 DO ENABLE FALLING THRESHOLD 4 ENABL 1.10 SHUT VIN = 4.5V 1.08 2 1.06 0 1.04 –50 0 50 100 150
017
–50 –30 –10 10 30 50 70 90 110 130 150
019
TEMPERATURE (°C)
10667-
TEMPERATURE (°C)
10667- Figure 22. Shutdown Current vs. Temperature Figure 25. Enable Threshold vs. Temperature
4.5 130 4.4 120 V) %) 110 4.3 UVLO, RISING VIN LD ( LD ( 100 SHO SHO 4.2 HRE HRE T 90 D T LO O 4.1 O UV 80 UVLO, FALLING V PG IN PGOOD FALL, FB INCREASING 4.0 70 PGOOD RISE, FB DECREASING PGOOD RISE, FB INCREASING PGOOD FALL, FB DECREASING 3.9 60 –50 –25 0 25 50 75 100 125
018
–50 –30 –10 10 30 50 70 90 110 130 150
021
TEMPERATURE (°C) TEMPERATURE (°C)
10667- 10667- Figure 23. UVLO Threshold vs. Temperature Figure 26. PGOOD Threshold vs. Temperature
2.25 1200 2.05 fSW = 1MHz 1.85 1000 ) 1.65 (mA) Y (kHz 800 NT 1.45 NC fSW = 700kHz UE 1.25 VIN = 4.5V Q V 600 RE 1.05 IN = 12V LY CURRE V F IN = 24V PP 0.85 V NG IN = 36V 400 f 0.65 ITCHI SW = 300kHz SU SW 0.45 200 0.25 0.05 0 –50 –30 –10 10 30 50 70 90 110 130 150
016
0 5 10 15 20 25 30 35 40
022
TEMPERATURE (°C) V
10667-
IN (V)
10667- Figure 24. Supply Current vs. Temperature Figure 27. Switching Frequency vs. Supply Rev. B | Page 10 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