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Analog Devices Semiconductor Electronic Components Datasheet

ADP3186 Datasheet

5-Bit Programmable 2-/3-/4-Phase Synchronous Buck Controller

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5-Bit Programmable 2-/3-/4-Phase
Synchronous Buck Controller
ADP3186
FEATURES
Selectable 2-, 3-, or 4-phase operation at up to 1 MHz
per phase
±1% worst-case differential sensing error over temperature
Logic-level PWM outputs for interface to external high
power drivers
Active current balancing between all output phases
Built-in power good/crowbar blanking supports on-the-fly
VID code changes
5-bit digitally programmable 0.8 V to 1.55 V output
Programmable short-circuit protection with programmable
latch-off delay
APPLICATIONS
Desktop PC power supplies for
AMD Opteron™ processors
VRM modules
GENERAL DESCRIPTION
The ADP3186 is a highly efficient multiphase synchronous
buck switching regulator controller optimized for converting a
12 V main supply into the core supply voltage required by high
performance AMD processors. It uses an internal 5-bit DAC to
read a voltage identification (VID) code directly from the pro-
cessor, which is used to set the output voltage between 0.8 V
and 1.55 V. It uses a multimode PWM architecture to drive the
logic-level outputs at a programmable switching frequency that
can be optimized for VR size and efficiency. The phase relation-
ship of the output signals can be programmed to provide 2-, 3-,
or 4-phase operation, allowing the construction of up to four
complementary buck switching stages.
The ADP3186 includes programmable no-load offset and slope
functions to adjust the output voltage as a function of the load
current, so that it is always optimally positioned for a system
transient. The ADP3186 also provides accurate and reliable
short-circuit protection, adjustable current limiting, and a power
good output that accommodates on-the-fly output voltage
changes requested by the CPU.
The ADP3186 is specified over the commercial temperature
range of 0°C to 85°C and is available in 28-lead TSSOP and
QSOP packages.
FUNCTIONAL BLOCK DIAGRAM
VCC
28
ADP3186
RAMPADJ RT
14 13
EN 11
GND 19
UVLO
SHUTDOWN
AND BIAS
OSCILLATOR
CMP
SET
RESET
EN
27 PWM1
CROWBAR 6
CSREF
2.1V
DAC + 300mV
CSREF
DAC – 300mV
PWRGD 10
DELAY
ILIMIT 15
EN
DELAY 12
COMP 9
SOFT
START
CURRENT
BALANCING
CIRCUIT
CMP
CMP
RESET
2-/3-/4-PHASE
DRIVER LOGIC
RESET
26 PWM2
25 PWM3
CMP RESET
24 PWM4
CROWBAR
CURRENT
LIMIT
CURRENT
LIMIT
CIRCUIT
23 SW1
22 SW2
21 SW3
20 SW4
17 CSSUM
16 CSREF
18 CSCOMP
8 FB
PRECISION
REFERENCE
VID
DAC
7
FBRTN
1
VID4
2
VID3
3
VID2
4
VID1
5
VID0
Figure 1.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

ADP3186 Datasheet

5-Bit Programmable 2-/3-/4-Phase Synchronous Buck Controller

No Preview Available !

ADP3186 pdf
ADP3186
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Specifications..................................................................................... 3
Test Circuits....................................................................................... 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Theory of Operation ........................................................................ 9
Start-Up Sequence........................................................................ 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.............................................................................. 11
Power Good Monitoring ........................................................... 12
Output Crowbar ......................................................................... 12
Output Enable and UVLO ........................................................ 12
Application Information................................................................ 14
Setting the Clock Frequency..................................................... 14
Soft Start and Current Limit Latch-Off Delay Times............ 14
Inductor Selection ...................................................................... 14
Designing an Inductor............................................................... 15
Selecting a Standard Inductor .............................................. 15
Output Droop Resistance.......................................................... 15
Inductor DCR Temperature Correction ................................. 16
Output Offset .............................................................................. 16
COUT Selection ............................................................................. 17
Power MOSFETs......................................................................... 17
Ramp Resistor Selection............................................................ 18
COMP Pin Ramp ....................................................................... 19
Current Limit Setpoint .............................................................. 19
Feedback Loop Compensation Design.................................... 19
CIN Selection and Input Current di/dt Reduction.................. 20
Tuning Procedure....................................................................... 21
DC Loadline Setting .............................................................. 21
AC Loadline Setting............................................................... 21
Initial Transient Setting ......................................................... 22
Layout and Component Placement ......................................... 22
General Recommendations .................................................. 22
Power Circuitry Recommendations .................................... 23
Signal Circuitry Recommendations .................................... 23
Outline Dimensions ....................................................................... 24
Ordering Guide .......................................................................... 24
REVISION HISTORY
3/06—Rev. 0 to Rev. A
Updated ADP3110 to ADP3110A................................. Universal
Changes to Table 1.......................................................................... 3
Added QSOP Package.................................................................. 24
Updated Ordering Guide............................................................. 24
8/04—Revision Sp0: Initial Version
Rev. A | Page 2 of 24


Part Number ADP3186
Description 5-Bit Programmable 2-/3-/4-Phase Synchronous Buck Controller
Maker Analog Devices
Total Page 24 Pages
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