ADP3208 ON Semiconductor, ADP3208 Datasheet - Page 2

• Manufacturer Part Number: ADP3208
• Description: 7-bit, Programmable, Dual-phase, Mobile, Cpu, Synchronous Buck Controller
• Manufacturer: ON Semiconductor

ADP3208
TABLE OF CONTENTS
Features...............................................................................................1
Applications .......................................................................................1
General Description..........................................................................1
Functional Block Diagram...............................................................1
Revision History................................................................................2
Specifications .....................................................................................3
Timing Diagram................................................................................7
Absolute Maximum Ratings ............................................................8
Pin Configuration and Function Descriptions .............................9
Test Circuits .....................................................................................11
Typical Performance Characteristics............................................12
Theory of Operation.......................................................................15
REVISION HISTORY
12/07- Rev 1: Conversion to ON Semiconductor
9/07—Rev. Sp0 to Rev. SpA
Changes to Absolute Maximum Ratings........................................8
Change to Table 3 ..............................................................................9
Change to Power Monitor Function Section...............................24
Changes to Ordering Guide...........................................................38
10/06—Revision Sp0: Initial Version
ESD Caution ..................................................................................8
Number of Phases .......................................................................15
Operation Modes ........................................................................15
Differential Sensing of Output Voltage ....................................18
Output Current Sensing .............................................................18
Active Impedance Control Mode .............................................18
Current Control Mode and Thermal Balance.........................19
Voltage Control Mode ................................................................19
Power-Good Monitoring ...........................................................19
Power-Up Sequence and Soft Start ...........................................19
Soft Transient...............................................................................20
Current Limit, Short-Circuit, and Latch-Off Protection.......21
Changing VID on the Fly...........................................................21
Output Crowbar ..........................................................................23
Rev. 1 | Page 2 of 38 | www.onsemi.com
Application Information ................................................................27
Outline Dimension .........................................................................38
Reverse Voltage Protection........................................................23
Output Enable and UVLO.........................................................23
Thermal Throttling Control......................................................23
Power Monitor Function ...........................................................24
Setting the Clock Frequency for PWM....................................27
Setting the Switching Frequency for
RPM Operation of Phase 1 ........................................................27
Soft Start and Current Limit Latch-Off Delay Times ............27
PWRGD Delay Timer ................................................................28
Inductor Selection.......................................................................28
C
Power MOSFETs .........................................................................31
Ramp Resistor Selection ............................................................32
COMP Pin Ramp ........................................................................32
Current Limit Setpoint...............................................................32
Power Monitor ............................................................................33
Feedback Loop Compensation Design ....................................33
C
Soft Transient Setting .................................................................34
Selecting Thermal Monitor Components................................34
Tuning Procedure for ADP3208 ...............................................35
Layout and Component Placement..........................................36
Ordering Guide ...........................................................................38
OUT
IN
Selection and Input Current di/dt Reduction ..................34
Selection..............................................................................30