6-Bit Programmable 2- to 4-Phase Synchronous Buck Controller
Description
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6-Bit Programmable 2- to 4-Phase Synchronous Buck Controller ADP3196
FEATURES
Selectable 2-, 3-, or 4-phase operation at up to 1 MHz per phase ±10 mV worst-case differential sensing error over temperature Logic-level PWM outputs for interface to external high power drivers Enhanced PWM flex mode for excellent load transient performance Active current balancing between all output phases Built-in power-good/crowbar blanking supports on-the-fly VID code changes Digitally programmable 0.
3750 V to 1.
55 V output Programmable short-circuit protection with programmable latch-off delay
FUNCTIONAL BLOCK DIAGRAM
VCC 31 RT 12 RAMPADJ 13 SHUNT REGULATOR OSCILLATOR SET RESET EN 30 PWM1 19 OD
UVLO SHUTDOWN GND 18
+ CMP – 800mV – + CURRENT BALANCING CIRCUIT + CMP – + CMP –
RESET
29 PWM2
EN
1
1.
8V CSREF
– +
RESET 2-/3-/4-PHASE DRIVER LOGIC
28 PWM3
+ DAC – 250mV –
+ CMP –
27 PWM4
RESET
CURRENT LIMIT PWRGD 2 DELAY CROWBAR 25 SW1 TTSENSE 10 24 SW2 THERMAL THROTTLING CONTROL 23 SW3 22 SW4
APPLICATIONS
Desktop PC power supplies for next generation AMD processors VRM modules
VRMHOT VRM_OFF
9 8
17 CSCOMP ILIMIT 11 DELAY 7 CURRENT MEASUREMENT AND LIMIT + – 16 CSSUM 21 IMON IREF 20 COMP 5 PRECISION REFERENCE FBRTN 3 SOFT START CONTROL 6 SS – + + – 14 LLSET 4 FB 15 CSREF
GENERAL DESCRIPTION
The ADP3196 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 Advanced Micro Devices, Inc.
(AMD) 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 between 0.
3750 V and 1.
55 V.
This device 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...
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