6-Bit, Programmable 2-/3-/4-Phase,
Synchronous Buck Controller
ADP3190
FEATURES
Selectable 2-, 3-, or 4-phase operation at up to
1 MHz per phase
FUNCTIONAL BLOCK DIAGRAM
VCC
28
RAMPADJ
14
RT
13
SHUNT
REGULATOR
(ADP3190 ONLY)
±±9. ꢀV worst-case differential sensing error
over teꢀperature
OSCILLATOR
UVLO
Logic-level PWM outputs for interface to external
high power drivers
PWM Flex-ModeTM architecture for excellent load
transient perforꢀance
Active current balancing between all output phases
Built-in power good/crowbar blanking supports on-the-fly
VID code changes
11
19
EN
SHUTDOWN
AND BIAS
SET
EN
27
26
25
24
RESET
PWM1
PWM2
PWM3
PWM4
CMP
GND
DAC
+150mV
RESET
CMP
CSREF
CURRENT
BALANCING
CIRCUIT
2-/3-/4-PHASE
DRIVER LOGIC
RESET
CMP
DAC
–250mV
6-bit digitally prograꢀꢀable 09837. V to 196 V output
RESET
CMP
Prograꢀꢀable short circuit protection with prograꢀꢀable
latch-off delay
10
PWRGD
DELAY
CROWBAR
CURRENT
LIMIT
APPLICATIONS
23
22
21
20
SW1
SW2
SW3
SW4
Desktop PC power supplies for
Next-generation Intel® processors
VRM ꢀodules
15
ILIMIT
Gaꢀes consoles
EN
17
16
18
CSSUM
CSREF
CURRENT
LIMIT
CIRCUIT
GENERAL DESCRIPTION
12
DELAY
The ADP3190/ADP3190A1 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
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.
CSCOMP
SOFT
START
8
FB
9
COMP
PRECISION
REFERENCE
VID
DAC
ADP3190
7
1
2
3
4
5
6
FBRTN
VID4 VID3 VID2 VID1 VID0 VID5
Figure 1.
The ADP3190/ADP3190A 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 ADP3190/ADP3190A 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.
The ADP3190 is a replacement for the ADP3188. 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.
Rev9 0
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