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ADP3157, ADP3157ENG, ADP3157J

Table of contents:
Info of ADP3157
Info of ADP3157ENG
Info of ADP3157J

ADP3157, ADP3157ENG, ADP3157J Selling Leads, Datasheet

MFG:AD Package Cooled:N/A D/C:99*

ADP3157, ADP3157ENG, ADP3157J Datasheet download

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Part Number: ADP3157

MFG: AD

Package Cooled: N/A

D/C: 99*

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ADP3157 General Description

The ADP3157 is a highly efficient synchronous buck switching regulator controller optimized for converting the 5 V main supply into the core supply voltage required by the Pentium III and other high performance processors. The ADP3157 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 1.3 V and 3.5 V. The ADP3157 uses a current mode, constant off-time architecture to drive two external Nchannel MOSFETs at a programmable switching frequency that can be optimized for size and efficiency. It also uses a unique supplemental regulation technique called active voltage positioning to enhance load transient performance.

Active voltage positioning results in a dc/dc converter that meets the stringent output voltage specifications for Pentium II and Pentium III processors, with the minimum number of output capacitors and smallest footprint. Unlike voltage-mode and standard current-mode architectures, active voltage positioning
adjusts the output voltage as a function of the load current so that it is always optimally positioned for a system transient. The ADP3157 provides accurate and reliable short circuit protection and adjustable current limiting. It also includes an integrated overvoltage crowbar function to protect the microprocessor from destruction in case the core supply exceeds the nominal programmed voltage by more than 15%.

ADP3157 Maximum Ratings

Input Supply Voltage (V_CC) . . . . . . . . . . 0.3 V to +16 V
VID0VID4, SD, PWRGD, CMP, CT . . . . . . . 0.3 V to V_CC
DRIVE1, DRIVE2, SENSE+, SENSE . . . . . .0.3 V to V_CC
Operating Ambient Temperature Range . . 0°C to +70°C
Junction Temperature Range . . . . . . . . . 0°C to +150°C
_JA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110°C/W
Storage Temperature Range . . . . . . . 65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . +300°C

ADP3157 Features

Active Voltage Positioning with Gain and Offset Adjustment
Optimal Compensation for Superior Load Transient Response
VRM 8.2, VRM 8.3 and VRM 8.4 Compliant
5-Bit Digitally Programmable 1.3 V to 3.5 V Output
Dual N-Channel Synchronous Driver
Total Output Accuracy 61% Over Temperature
High Efficiency, Current-Mode Operation
Short Circuit Protection
Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components
Power Good Output
SO-16 Package

ADP3157 Typical Application

Desktop PC Power Supplies for:
Pentium II and Pentium III Processor Families
AMD-K6 Processors
VRM Modules

ADP3157 Connection Diagram

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