ADP3168 Analog Devices, ADP3168 Datasheet - Page 2

• Manufacturer Part Number: ADP3168
• Description: 4-Phase Synchronous Buck Controller
• Manufacturer: Analog Devices

www.DataSheet4U.com
DataSheet U .com
ADP3168
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics and Test Circuits............... 7
Theory of Operation ........................................................................ 9
Application Information................................................................ 13
REVISION HISTORY
11/04—Rev. A to Rev. B
Changes to Specifications ................................................................ 3
Updated Outline Dimensions ....................................................... 24
Changes to Ordering Guide .......................................................... 24
4/03—Data Sheet Changed from Rev. 0 to Rev. A.
Changes to Specifications ................................................................ 2
ESD Caution.................................................................................. 5
Number of Phases......................................................................... 9
Master Clock Frequency.............................................................. 9
Output Voltage Differential Sensing .......................................... 9
Output Current Sensing .............................................................. 9
Active Impedance Control Mode............................................. 10
Current-Control Mode and Thermal Balance........................ 10
Voltage Control Mode................................................................ 10
Soft Start ...................................................................................... 10
Current-Limit, Short-Circuit, and Latch-Off Protection...... 11
Dynamic VID.............................................................................. 12
Power-Good Monitoring........................................................... 12
Output Crowbar ......................................................................... 12
Output Enable and UVLO ........................................................ 12
Setting the Clock Frequency ..................................................... 13
4
Rev. B | Page 2 of 24
Layout and Component Placement.............................................. 23
Outline Dimensions ....................................................................... 24
Soft Start and Current Limit Latch-Off Delay Times............ 13
Inductor Selection ...................................................................... 13
Designing an Inductor............................................................... 15
Selecting a Standard Inductor................................................... 15
Output Droop Resistance.......................................................... 15
Inductor DCR Temperature Correction ................................. 16
Output Offset .............................................................................. 16
C
Power MOSFETs......................................................................... 18
Ramp Resistor Selection............................................................ 19
COMP Pin Ramp ....................................................................... 19
Current-Limit Set Point............................................................. 19
Feedback Loop Compensation Design.................................... 19
C
Tuning Procedure for the ADP3168 ........................................ 21
General Recommendations....................................................... 23
Power Circuitry .......................................................................... 23
Signal Circuitry........................................................................... 23
Ordering Guide .......................................................................... 24
OUT
IN
Selection and Input Current di/dt Reduction.................. 21
Selection ............................................................................. 17