ADP3191 Datasheet PDF - Analog Devices
|Synchronous Buck Controller
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6-Bit, Programmable 2-/3-/4-Phase,
Synchronous Buck Controller
Selectable 2-, 3-, or 4-phase operation at up to
1 MHz per phase
±14.5 mV worst-case differential sensing error
Logic-level PWM outputs for interface to external
high power drivers
PWM Flex-ModeTM architecture for excellent load
Active current balancing between all output phases
Built-in power good/crowbar blanking supports on-the-fly
VID code changes
6-bit digitally programmable 0.8375 V to 1.6 V output
Programmable short circuit protection with programmable
Desktop PC power supplies for
Next-generation Intel® processors
The ADP3191/ADP3191A1 are highly efficient, multiphase,
synchronous buck switching regulator controllers optimized for
converting a 5 V or 12 V main supply into the core supply voltage
required by high performance Intel processors. They use 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 0.8375 V and 1.6 V. The devices use a multimode
PWM architecture to drive the logic-level outputs at a program-
mable 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
The ADP3191/ADP3191A also include programmable, no-load
offset and slope functions to adjust the output voltage as a function
of the load current, so it is always optimally positioned for a
system transient. The ADP3191/ADP3191A also provide
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.
FUNCTIONAL BLOCK DIAGRAM
VID4 VID3 VID2 VID1 VID0 VID5
The ADP3191 is a replacement for the ADP3181. A built-in
shunt regulator allows the part to be connected to the 12 V
system supply through a series resistor.
The devices are specified over the commercial temperature
range of 0°C to 85°C and are available in a 28-lead TSSOP
and a 28-lead QSOP.
1 Protected by U. S. Patent Number 6,683,441; other patents pending.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
©2006 Analog Devices, Inc. All rights reserved.
ABSOLUTE MAXIMUM RATINGS
−0.3 V to +6 V
−0.3 V to +6 V
−0.3 V to +0.3 V
SW1 to SW4
−5 V to +25 V
All Other Inputs and Outputs
−0.3 V to VCC + 0.3 V
Storage Temperature Range
Operating Ambient Temperature Range
Operating Junction Temperature
Thermal Impedance (θJA)
−65°C to +150°C
0°C to +85°C
Soldering (10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
Absolute maximum ratings apply individually only, not in
combination. Unless otherwise specified, all other voltages
are referenced to GND.
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
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