www.DataSheet4U.com
5-Bit Programmable 2-/3-/4-Phase Synchronous Buck Controller ADP3186
FEATURES
Selectable 2-, 3-, or...
www.DataSheet4U.com
5-Bit Programmable 2-/3-/4-Phase Synchronous Buck Controller ADP3186
FEATURES
Selectable 2-, 3-, or 4-phase operation at up to 1 MHz per phase ±1% worst-case 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 5-bit digitally programmable 0.8 V to 1.55 V output Programmable short-circuit protection with programmable latch-off delay
FUNCTIONAL BLOCK DIAGRAM
VCC
28
RAMPADJ
14
RT
13
ADP3186
UVLO SHUTDOWN AND BIAS
EN 11
OSCILLATOR SET EN
27 PWM1
GND 19
CMP
RESET
CROWBAR 6 CSREF 2.1V
CMP CURRENT BALANCING CIRCUIT CMP
RESET 2-/3-/4-PHASE DRIVER LOGIC RESET
26 PWM2
25 PWM3
DAC + 300mV CSREF
CMP
RESET
24 PWM4
CROWBAR
CURRENT LIMIT
APPLICATIONS
Desktop PC power supplies for AMD Opteron™ processors VRM modules
DAC – 300mV
23 SW1
PWRGD 10
DELAY
22 SW2 21 SW3
ILIMIT 15 EN
20 SW4
GENERAL DESCRIPTION
The ADP3186 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 AMD processors. It uses an internal 5-bit DAC to read a voltage identification (VID) code directly from the processor, which is used to set the output voltage between 0.8 V and 1.55 V. It uses a multimode PWM architecture to drive the logic-level outputs at a programmable...