6-Bit Programmable 2-/3-/4-Phase
Synchronous Buck Controller
ADP3188
FEATURES
Selectable 2-, 3- or 4-phase operation at up to
1 MHz per phase
±±9. ꢀV worst-case differential sensing error over
teꢀperature
FUNCTIONAL BLOCK DIAGRAM
VCC
RAMPADJ RT
28
14 13
ADP3188
UVLO
SHUTDOWN
AND BIAS
11
EN
OSCILLATOR
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
6-bit digitally prograꢀꢀable 09837. V to 196 V output
SET
EN
GND 19
RESET
27 PWM1
CMP
CMP
CMP
CMP
DAC+150mV
CSREF
26
RESET
PWM2
2-/3-/4-PHASE
DRIVER LOGIC
CURRENT
BALANCING
CIRCUIT
RESET
25 PWM3
DAC-250mV
RESET
24
PWM4
Prograꢀꢀable short-circuit protection with
prograꢀꢀable latch-off delay
DELAY
10
PWRGD
ILIMIT
CROWBAR
CURRENT
LIMIT
SW1
SW2
SW3
SW4
23
22
21
20
APPLICATIONS
15
12
Desktop PC power supplies for
Next-generation Intel® processors
VRM ꢀodules
EN
CSSUM
17
CURRENT
LIMIT
CIRCUIT
DELAY
COMP
16
18
CSREF
GENERAL DESCRIPTION
SOFT
START
CSCOMP
The ADP3188 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 Intel processors. The part 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
0.8375 V and 1.6 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 relationship of the output signals can be pro-
grammed to provide 2-, 3-, or 4-phase operation, allowing
the construction of up to four complementary buck
switching stages.
8
FB
9
PRECISION
REFERENCE
VID
DAC
7
1
2
3
4
5
6
FBRTN
VID4 VID3 VID2 VID1 VID0 VID5
Figure 1.
The ADP3188 also includes 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 ADP3188 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 ADP3188 is specified over the commercial tempera-
ture range of 0°C to 85°C and is available in 28-lead, TSSOP
and QSOP packages.
Rev9 A
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