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ADP3210 Datasheet

7-Bit Programmable Multiphase Mobile CPU Synchronous

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FEATURES
1-, 2-, or 3-phase operation at up to 1 MHz per phase
Input Voltage Range of 3.3 V to 22 V
±8 mV worst-case differential sensing error over
temperature
Interleaved PWM outputs for driving external high power
MOSFET drivers
Automatic power-saving modes maximize efficiency during
light load and deeper sleep operation
Active current balancing between output phases
Independent current limit and load line setting inputs for
additional design flexibility
7-bit digitally programmable 0 V to 1.5 V output
Overload and short-circuit protection with latch-off delay
Built-in clock enable output for delaying CPU clock
synchronization until CPU supply voltage stabilizes
Output Current Monitor
APPLICATIONS
Notebook power supplies for next generation Intel®
processors
GENERAL DESCRIPTION
The ADP3210 is a high efficiency, multiphase, synchronous,
www.DabtuacSkh-esweti4tUch.cinomg regulator controller optimized for converting
notebook battery voltage into the core supply voltage of high
performance Intel processors. The part uses an internal 7-bit
DAC to read voltage identification (VID) code directly from the
processor that sets the output voltage. The phase relationship of
the output signals can be configured for 1-, 2-, or 3-phase
operation, with interleaved switching.
The ADP3210 uses a multimode architecture1 to drive the logic-
level PWM outputs at a switching frequency selected by the
user depending on the output current requirement. The part
switches between multiphase and single-phase operation according
to a system signal provided by the CPU. Shedding phases as
function of the load maximizes power conversion efficiency under
different load conditions. In addition, the ADP3210 supports
programmable loadline resistance adjustment. As a result, the
7-Bit Programmable
Multiphase Mobile
CPU Synchronous
ADP3210
output voltage is always optimally positioned for a load transient.
Patent 6,683,441.
FUNCTIONAL BLOCK DIAGRAM
GND
VCC EN
RPM RT RAMP
TRDET
COMP
FB
LLINE
PSI
TRDET
Generator
UVLO
Shutdown
and Bias
REF
VEA
-
+
Σ+
+ CSREF
+Σ _
OVP
1.55V
Oscillator
Current
Balancing
Circuit
Driver
Logic
DPRSLP
DAC + 200mV
-
CSREF
+
PSI and
DPRSLP
Logic
-
+
DAC - 300mV
PWRGD
PWRGD
Open
Drain
PWRGD
Start Up
Delay
CLKEN
FBRTN
CLKEN
Open
Drain
Precision
Reference
CLKEN
Start Up
Delay
Current
Limit
Circuit
Soft
Transient
Delay
Delay
Disable
VID
DAC
DAC
OCP
Shutdown
Delay
Current
Monitor
+
-
Thermal
Throttle
Control
Soft Start
and Soft
Transient
Control
REF
PWM1
PWM2
PWM3
DCM1
OD
SW1
SW2
SW3
IMON
CSREF
CSSUM
CSCOMP
ILIM
TTSENSE
VRTT
Figure 1.
The chip also provides accurate and reliable short-circuit
protection with adjustable current limit threshold and a delayed
power-good output that is masked during on-the-fly output
voltage changes to eliminate false alarm.
The ADP3210 performance is specified over the extended
commercial temperature range of -10°C to 100°C. The chip is
available in a 40-lead QFN package.
www.onsemi.com


  ON Semiconductor Electronic Components Datasheet  

ADP3210 Datasheet

7-Bit Programmable Multiphase Mobile CPU Synchronous

No Preview Available !

ADP3210
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Test Circuits....................................................................................... 7
Absolute Maximum Ratings............................................................ 8
ESD Caution.................................................................................. 8
Pin Configuration and Function Descriptions............................. 9
Typical Performance Characteristics ........................................... 11
Theory of Operation ...................................................................... 14
Number of Phases....................................................................... 14
Operation Modes........................................................................ 14
Switch Frequency Setting .......................................................... 16
Output Voltage Differential Sensing ........................................ 16
Output Current Sensing ............................................................ 17
Active Impedance Control Mode............................................. 17
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Current Control Mode and Thermal Balance ........................ 17
Voltage Control Mode................................................................ 18
Power-Good Monitoring........................................................... 18
Power-Up Sequence and Soft Start .......................................... 18
Soft Transient .............................................................................. 18
Current-Limit, Short-Circuit, and Latch-Off Protection...... 18
Changing VID on-the-Fly......................................................... 19
REVISION HISTORY
5/08—Revision 0: Initial Preliminary Version
Output Crowbar ......................................................................... 19
Reverse Voltage Protection ....................................................... 19
Output Enable and UVLO ........................................................ 20
Output Current Monitor ........................................................... 20
Thermal Throttling Control ..................................................... 20
Application Information................................................................ 25
Setting the Clock Frequency for PWM Mode........................ 25
Inductor Selection ...................................................................... 25
COUT Selection ............................................................................. 27
Power MOSFETs......................................................................... 28
Ramp Resistor Selection............................................................ 29
Setting the Switching Frequency for RPM Mode Operation of
Phase 1 ......................................................................................... 29
Current-Limit Setpoint.............................................................. 30
Output Current monitor ........................................................... 30
Feedback Loop Compensation Design ................................... 30
CIN Selection and Input Current DI/DT Reduction ................ 31
RC Snubber ................................................................................. 31
Selecting Thermal Monitor Components ............................... 32
Tuning Procedure for ADP3210............................................... 32
Layout and Component Placement ......................................... 34
Outline Dimensions ....................................................................... 36
Ordering Guide .......................................................................... 36
Rev. 0.3 | Page 2 of 38


Part Number ADP3210
Description 7-Bit Programmable Multiphase Mobile CPU Synchronous
Maker ON Semiconductor
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