www.DataSheet4U.com
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FEATURES Optimally Compensated Active Voltage Positioning with Gain and Offset Adjustment (ADOPT™...
www.DataSheet4U.com
a
FEATURES Optimally Compensated Active Voltage Positioning with Gain and Offset Adjustment (ADOPT™) for Superior Load Transient Response Complies with VRM Specifications with Lowest System Cost 4-Bit Digitally Programmable 1.3 V to 2.05 V Output N-Channel Synchronous Buck Driver Total Accuracy ؎0.8% Over Temperature Two On-Board Linear
Regulator Controllers Designed to Meet System Power Sequencing Requirements High Efficiency Current-Mode Operation Short Circuit Protection for Switching
Regulator Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components APPLICATIONS Core Supply Voltage Generation for: Intel Pentium® III Intel Celeron™
4-Bit Programmable Synchronous Buck Controllers ADP3158/ADP3178
FUNCTIONAL BLOCK DIAGRAM
VCC CT
ADP3158/ ADP3178
UVLO & BIAS OSCILLATOR PWM DRIVE DRVL REFERENCE REF GND DRVH
VLR1 LRFB1 CMP – + LRDRV1 VLR2 LRFB2
DAC+20% CS– CS+
gm LRDRV2 COMP REF VID DAC
VID3
VID2
VID1
VID0
GENERAL DESCRIPTION
The ADP3158 and ADP3178 are highly efficient synchronous buck switching
regulator controllers optimized for converting a 5 V main supply into the core supply voltage required by highperformance processors. These devices use an internal 4-bit DAC to read a voltage identification (VID) code directly from the processor, which is used to set the output voltage between 1.3 V and 2.05 V. They use a current mode, constant off-time architecture to drive two N-channel MOSFETs at a programmable swi...