Datasheet ADP2441 (Analog Devices) - 2
| Hersteller | Analog Devices |
| Beschreibung | 36 V,1 A, Synchronous, Step-Down DC-DC Regulator |
| Seiten / Seite | 32 / 2 — ADP2441. Data Sheet. TABLE OF CONTENTS. REVISION HISTORY 8/15—Rev. B to … |
| Revision | C |
| Dateiformat / Größe | PDF / 1.5 Mb |
| Dokumentensprache | Englisch |
ADP2441. Data Sheet. TABLE OF CONTENTS. REVISION HISTORY 8/15—Rev. B to Rev. C. 6/14—Rev. A to Rev. B. 11/12—Rev. 0 to Rev. A
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ADP2441 Data Sheet TABLE OF CONTENTS
Features .. 1 Applications Information .. 18 Applications ... 1 Selecting the Output Voltage .. 18 General Description ... 1 Setting the Switching Frequency .. 18 Typical Circuit Configuration ... 1 Soft Start .. 19 Revision History ... 2 External Components Selection ... 19 Specifications ... 3 Boost Capacitor .. 21 Absolute Maximum Ratings .. 5 VCC Capacitor.. 21 Thermal Resistance .. 5 Loop Compensation .. 21 ESD Caution .. 5 Large Signal Analysis of the Loop Compensation ... 21 Pin Configuration and Function Descriptions ... 6 Design Example .. 23 Typical Performance Characteristics ... 7 Configuration and Components Selection ... 23 Internal Block Diagram ... 14 System Configuration .. 24 Theory of Operation .. 15 Typical Application Circuits ... 25 Control Architecure ... 15 Design Example .. 25 Adjustable Frequency ... 16 Other Typical Circuit Configurations ... 26 Power Good ... 16 Power Dissipation and Thermal Considerations ... 29 Soft Start .. 16 Power Dissipation... 29 Tracking ... 16 Thermal Considerations .. 29 Undervoltage Lockout (UVLO) ... 17 Evaluation Board Thermal Performance .. 30 Precision Enable/Shutdown .. 17 Circuit Board Layout Recommendations ... 31 Current-Limit and Short-Circuit Protection .. 17 Outline Dimensions ... 32 Thermal Shutdown ... 17 Ordering Guide .. 32
REVISION HISTORY 8/15—Rev. B to Rev. C
Changes to Figure 45 .. 14
6/14—Rev. A to Rev. B
Change to Features Section ... 1
11/12—Rev. 0 to Rev. A
Changes to Figure 1 .. 1 Changed IVIN Maximum Parameter from 2.2 mA to2 mA .. 3 Changes to Pin 3 and Pin 5 Descriptions .. 6 Changes to Boost Capacitor Section .. 21 Changes to Figure 66 .. 31 Changes to Ordering Guide .. 32
6/12—Revision 0: Initial Version
Rev. C | Page 2 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
ADP2441 Data Sheet TABLE OF CONTENTS
Features .. 1 Applications Information .. 18 Applications ... 1 Selecting the Output Voltage .. 18 General Description ... 1 Setting the Switching Frequency .. 18 Typical Circuit Configuration ... 1 Soft Start .. 19 Revision History ... 2 External Components Selection ... 19 Specifications ... 3 Boost Capacitor .. 21 Absolute Maximum Ratings .. 5 VCC Capacitor.. 21 Thermal Resistance .. 5 Loop Compensation .. 21 ESD Caution .. 5 Large Signal Analysis of the Loop Compensation ... 21 Pin Configuration and Function Descriptions ... 6 Design Example .. 23 Typical Performance Characteristics ... 7 Configuration and Components Selection ... 23 Internal Block Diagram ... 14 System Configuration .. 24 Theory of Operation .. 15 Typical Application Circuits ... 25 Control Architecure ... 15 Design Example .. 25 Adjustable Frequency ... 16 Other Typical Circuit Configurations ... 26 Power Good ... 16 Power Dissipation and Thermal Considerations ... 29 Soft Start .. 16 Power Dissipation... 29 Tracking ... 16 Thermal Considerations .. 29 Undervoltage Lockout (UVLO) ... 17 Evaluation Board Thermal Performance .. 30 Precision Enable/Shutdown .. 17 Circuit Board Layout Recommendations ... 31 Current-Limit and Short-Circuit Protection .. 17 Outline Dimensions ... 32 Thermal Shutdown ... 17 Ordering Guide .. 32
REVISION HISTORY 8/15—Rev. B to Rev. C
Changes to Figure 45 .. 14
6/14—Rev. A to Rev. B
Change to Features Section ... 1
11/12—Rev. 0 to Rev. A
Changes to Figure 1 .. 1 Changed IVIN Maximum Parameter from 2.2 mA to2 mA .. 3 Changes to Pin 3 and Pin 5 Descriptions .. 6 Changes to Boost Capacitor Section .. 21 Changes to Figure 66 .. 31 Changes to Ordering Guide .. 32
6/12—Revision 0: Initial Version
Rev. C | Page 2 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