ADP3208C ON Semiconductor, ADP3208C Datasheet - Page 3

• Manufacturer Part Number: ADP3208C
• Description: 7-bit,programmable,dual- 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............................................15
Theory of Operation .......................................................................19
REVISION HISTORY
5/08- Rev 1: Initial Preliminary Version
ESD Caution ................................................................................10
Number of Phases .......................................................................19
Operation Modes ........................................................................19
Differential Sensing of Output Voltage ....................................22
Output Current Sensing .............................................................22
Active Impedance Control Mode..............................................22
CURRENT Control Mode AND THERMAL BALANCE ....23
Voltage Control Mode ................................................................23
Power-Good Monitoring............................................................23
Power-Up Sequence and Soft Start ...........................................23
Soft Transient...............................................................................24
Current Limit...............................................................................24
Changing VID on the Fly...........................................................25
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Application Information ................................................................31
Outline Dimension .........................................................................41
OUTPUT CROWBAR ...............................................................26
Reverse Voltage Protection ........................................................27
Output Enable and UVLO.........................................................27
Thermal Throttling Control ......................................................27
CURRENT MONITOR FUNCTION ......................................27
Setting the Clock Frequency for PWM....................................31
Setting the Switching Frequency for RPM Operation of Phase
1 .....................................................................................................31
Inductor Selection.......................................................................31
C
Power MOSFETs .........................................................................34
Ramp Resistor Selection.............................................................35
COMP Pin Ramp ........................................................................35
Current Limit Setpoint...............................................................36
Output Current monitor ............................................................36
Feedback Loop Compensation Design ....................................36
C
Selecting Thermal Monitor Components................................38
Tuning Procedure for ADP3208C ............................................38
Layout and Component Placement ..........................................39
Ordering Guide ...........................................................................41
OUT
IN
Selection and Input Current di/dt Reduction ..................37
Selection..............................................................................33
ADP3208C