ADP3212 ON Semiconductor, ADP3212 Datasheet - Page 3

• Manufacturer Part Number: ADP3212
• Description: 7-bit Programmable, 3-phase,mobile Cpu Synchronous Buck Controller
• Manufacturer: ON Semiconductor

TABLE OF CONTENTS
Features...............................................................................................1
Applications .......................................................................................1
General Description..........................................................................1
Functional Block Diagram ...............................................................2
Revision History................................................................................3
Specifications .....................................................................................4
Timing Diagram................................................................................9
Absolute Maximum Ratings ..........................................................10
Pin Configuration and Function Descriptions ...........................11
Test Circuits .....................................................................................13
Typical Performance Characteristics............................................14
Theory of Operation .......................................................................15
REVISION HISTORY
4/08—Revision Sp0: Initial Version
ESD Caution ................................................................................10
Number of Phases .......................................................................15
Operation Modes ........................................................................15
Differential Sensing of Output Voltage ....................................19
Output Current Sensing .............................................................19
Active Impedance Control Mode..............................................19
Current Control Mode and Thermal Balance.........................20
Voltage Control Mode ................................................................20
Power-Good Monitoring............................................................20
Power-Up Sequence and Soft Start ...........................................21
Current Limit...............................................................................21
Changing VID on the Fly...........................................................21
Rev. SpA | Page 3 of 43
Application Information ................................................................28
Outline Dimension .........................................................................39
Output Crowbar..........................................................................24
Reverse Voltage Protection ........................................................24
Output Enable and UVLO.........................................................24
Thermal Throttling Control ......................................................24
Setting the Clock Frequency for PWM....................................28
Setting the Switching Frequency for RPM Operation of Phase
1 .....................................................................................................28
Soft Start and Current Limit Latch-Off Delay Times ............28
Inductor Selection.......................................................................28
C
Power MOSFETs .........................................................................32
Ramp Resistor Selection.............................................................33
Current Limit Setpoint...............................................................33
Current Monitor..........................................................................33
Feedback Loop Compensation Design ....................................33
C
RC Snubber..................................................................................35
Selecting Thermal Monitor Components................................35
Tuning Procedure for ADP3212/NCP3218.............................36
Layout and Component Placement ..........................................37
Ordering Guide ...........................................................................41
OUT
IN
Selection and Input Current di/dt Reduction ..................35
Selection..............................................................................31
ADP3212/NCP3218