Datasheet ADP2441 (Analog Devices) - 10

ADP2441 Data Sheet 1200 1200 f 1100 SW = 1MHz fSW = 1MHz 1000 ) 1000 kHz ( Y 900 ) 800 NC fSW = 700kHz kHz ( 800 UE Y Q fSW = 700kHz 600 NC 700 RE F UE Q 600 NG RE 400 F CHI f 500 IT SW = 300kHz W S 400 200 fSW = 300kHz 300 0 200 0 5 10 15 20 25 30 35 40
022
–50 –30 –10 10 30 50 70 90 110 130 150
023
V TEMPERATURE (°C) IN (V)
10581- 10581- Figure 22. Switching Frequency vs. Supply Figure 25. Switching Frequency vs. Temperature
200 1.80 1.78 175 MINIMUM OFF 1.76 ) 1.74 ns 150 1.72 ( E 1.70 125 A) 1.68 ( VIN = 36V NT 1.66 OFF TIM 100 D 1.64 N A 1.62 E 75 CURRE 1.60 VIN = 4.5V TIM 1.58 50 MINIMUM ON ON 1.56 25 1.54 1.52 0 1.50 –50 –30 –10 10 30 50 70 90 110 130 150
024
–50 0 50 100 150
126
TEMPERATURE (°C) TEMPERATURE (°C)
10581- 10581- Figure 23. Minimum On Time and Minimum Off Time vs. Temperature Figure 26. Current Limit vs. Temperature
260 180 240 160 140 220 Ω) Ω) (m 120 (m N) 200 N) (O (O 100 DS DS 180 R E R 80 IDE D S 160 -SI H- G W 60 HI LO 140 40 120 20 100 0 –50 –25 0 25 50 75 100 125 150
027
–50 –30 –10 10 30 50 70 90 110 130 150
026
TEMPERATURE (°C) TEMPERATURE (°C)
10581- 10581- Figure 24. High-Side RDS(ON) vs. Temperature Figure 27. Low-Side RDS(ON) vs. Temperature Rev. C | Page 10 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