The ADP3181 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. 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. The CPUID input selects whether the DAC codes match the VRM 9 or VRD 10 specifications. 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 programmed to provide 2-, 3-, or 4-phase operation, allowing for the construction of up to four complementary buck-switching stages.
The ADP3181 also 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 ADP3181 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 device is specified over the commercial temperature range of 0°C to +85°C and is available in 28-lead QSOP (only VRD10 option) and TSSOP packages.
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Desktop PC power supplies for next-generation Intel processors VRM modules
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Selectable 2-, 3-, or 4-phase operation at up to 1 MHz perphase ±14.5 mV worst-case mV 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 Digitally programmable output can be switched between VRM 9 (5-bit) and VRD 10 (6-bit) VID codes for ADP3181JRU. (VRD10 (6-bit) only for ADP3181JRQ) Programmable short circuit protection with programmable latch-off delay
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Parameter Rating
VCC −0.3 V to 15 V
FBRTN −0.3 V to +0.3 V
VID0 to VID4, CPUID, EN, DELAY, ILIMIT, −0.3 V to 5.5 V
CSCOMP, RT, PWM1 to PWM4, COMP
SW1 to SW4 −5 V to +25 V
All Other Inputs and Outputs &
Post a Buying Lead
Required Field 
