B1077AS-4R7N AD [Analog Devices], B1077AS-4R7N Datasheet - Page 2

• Manufacturer Part Number: B1077AS-4R7N
• Description: 1.2 A, 20 V, 700 kHz/1.4 MHz, Nonsynchronous Step-Down Regulator
• Manufacturer: AD [Analog Devices]

ADP2300/ADP2301
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Typical Applications Circuit ............................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
Pin Configuration and Function Descriptions ............................. 5
Typical Performance Characteristics ............................................. 6
Functional Block Diagram ............................................................ 13
Theory of Operation ...................................................................... 14
REVISION HISTORY
2/10—Revision 0: Initial Version
Thermal Resistance ...................................................................... 4
ESD Caution .................................................................................. 4
Basic Operation .......................................................................... 14
PWM Mode ................................................................................. 14
Power Saving Mode .................................................................... 14
Bootstrap Circuitry .................................................................... 14
Precision Enable ......................................................................... 14
Integrated Soft Start ................................................................... 14
Current Limit .............................................................................. 14
Short-Circuit Protection ............................................................ 15
Undervoltage Lockout (UVLO) ............................................... 15
Rev. 0 | Page 2 of 28
Applications Information .............................................................. 16
Design Example .............................................................................. 21
Circuit Board Layout Recommendations ................................... 23
Typical Application Circuits ......................................................... 24
Outline Dimensions ....................................................................... 26
Thermal Shutdown .................................................................... 15
Control Loop ............................................................................... 15
Programming the Output Voltage ........................................... 16
Voltage Conversion Limitations ............................................... 16
Low Input Voltage Considerations .......................................... 17
Programming the Precision Enable ......................................... 17
Inductor ....................................................................................... 18
Catch Diode ................................................................................ 19
Input Capacitor ........................................................................... 19
Output Capacitor........................................................................ 19
Thermal Considerations ............................................................ 20
Switching Frequency Selection ................................................. 21
Catch Diode Selection ............................................................... 21
Inductor Selection ...................................................................... 21
Output Capacitor Selection....................................................... 21
Resistive Voltage Divider Selection .......................................... 22
Ordering Guide .......................................................................... 26