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Analog Devices Semiconductor Electronic Components Datasheet

ADP3196 Datasheet

6-Bit Programmable 2- to 4-Phase Synchronous Buck Controller

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ADP3196 pdf
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6-Bit Programmable 2- to 4-Phase
Synchronous Buck Controller
ADP3196
FEATURES
Selectable 2-, 3-, or 4-phase operation at up to 1 MHz
per phase
±10 mV worst-case differential sensing error over
temperature
Logic-level PWM outputs for interface to external
high power drivers
Enhanced PWM flex mode for excellent load transient
performance
Active current balancing between all output phases
Built-in power-good/crowbar blanking supports on-the-fly
VID code changes
Digitally programmable 0.3750 V to 1.55 V output
Programmable short-circuit protection with programmable
latch-off delay
APPLICATIONS
Desktop PC power supplies for next generation
AMD processors
VRM modules
GENERAL DESCRIPTION
The ADP31961 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 Advanced Micro Devices, Inc. (AMD) processors.
It uses an internal 6-bit DAC to read a voltage identification
(VID) code directly from the processor, which is used to set the
output voltage between 0.3750 V and 1.55 V.
This device 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
relationship of the output signals can be programmed to provide
2-, 3-, or 4-phase operation, allowing for the construction of up to
four complementary buck switching stages.
The ADP3196 supports a programmable slope function to
adjust the output voltage as a function of the load current so
that it is always optimally positioned for a system transient. This
can be disabled by connecting Pin LLSET to Pin CSREF.
1Protected by U.S. Patent Number 6,683,441; others patents pending.
FUNCTIONAL BLOCK DIAGRAM
VCC
31
RT RAMPADJ
12 13
GND 18
SHUNT
REGULATOR
UVLO
SHUTDOWN
800mV
EN 1
+
1.8V
CSREF
+
DAC – 250mV
+
PWRGD 2
DELAY
TTSENSE 10
VRMHOT 9
VRM_OFF 8
THERMAL
THROTTLING
CONTROL
OSCILLATOR
CURRENT
BALANCING
CIRCUIT
+
CMP
+
CMP
+
–CMP
+
CMP
SET EN
RESET
RESET
RESET
2-/3-/4-PHASE
DRIVER LOGIC
RESET
19 OD
30 PWM1
29 PWM2
28 PWM3
27 PWM4
CROWBAR
CURRENT
LIMIT
25 SW1
24 SW2
23 SW3
22 SW4
ILIMIT 11
DELAY 7
IREF 20
COMP 5
FBRTN 3
PRECISION
REFERENCE
CURRENT
MEASUREMENT
AND LIMIT
+
+
+
SOFT START
CONTROL
17 CSCOMP
15 CSREF
16 CSSUM
21 IMON
4 FB
14 LLSET
6 SS
VID DAC
34 35 36 37 38 39
VID5 VID4 VID3 VID2 VID1 VID0
ADP3196
Figure 1. Functional Block Diagram
The ADP3196 also provides accurate and reliable short-circuit
protection, adjustable current limiting, and a delayed power-
good output that accommodates on-the-fly output voltage
changes requested by the CPU. The ADP3196 has a built-in
shunt regulator that allows the part to be connected to the 12 V
system supply through a series resistor.
The ADP3196 is specified over the extended commercial
temperature range of 0°C to +85°C and is available in a
40-lead LFCSP.
Rev. 0
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

ADP3196 Datasheet

6-Bit Programmable 2- to 4-Phase Synchronous Buck Controller

No Preview Available !

ADP3196 pdf
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Table of Contents .............................................................................. 2
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Test Circuits....................................................................................... 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Description .............................. 7
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 10
Start-Up Sequence...................................................................... 10
Phase Detection Sequence......................................................... 10
Master Clock Frequency............................................................ 11
Output Voltage Differential Sensing ........................................ 11
REVISION HISTORY
10/06—Revision 0: Initial Version
ADP3196
Output Current Sensing ............................................................ 11
Active Impedance Control Mode............................................. 11
Current Control Mode and Thermal Balance ........................ 11
Voltage Control Mode ............................................................... 12
Current Reference ...................................................................... 12
Enhanced PWM Mode .............................................................. 12
Delay Timer................................................................................. 12
Soft Start ...................................................................................... 12
Current Limit, Short-Circuit, and Latch-Off Protection ...... 13
Dynamic VID ............................................................................. 14
Power-Good Monitoring........................................................... 14
Output Crowbar ......................................................................... 14
Output Enable and UVLO ........................................................ 14
Thermal Monitoring .................................................................. 14
Layout and Component Placement ......................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
Rev. 0 | Page 2 of 20


Part Number ADP3196
Description 6-Bit Programmable 2- to 4-Phase Synchronous Buck Controller
Maker Analog Devices
Total Page 20 Pages
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