AN2787 datasheet(6/37 Pages) STMICROELECTRONICS

Part #	AN2787

Description	Monolithic VR demonstration board for chipset

PDF	37 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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6 / 37 page

Main features

AN2787

6/37

Main features

Switching section

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0.8 V ±1% voltage reference

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2.7 V to 5.5 V input voltage range

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Fast response, constant frequency, current mode control

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Three independent, adjustable, SMPS for DDR2/3 (VDDQ) and chipset supply

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S3-S5 states compliant with DDR2/3 section

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Active soft-end for all outputs

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Selectable tracking discharge for VDDQ

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Separate Power Good signals

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Pulse skipping at light load

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Programmable current limit and soft-start for all outputs

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Latched OVP, UVP protection

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Thermal protection

Reference and termination voltages (VTTREF and VTT)

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±2 Apk LDO for DDR2/3 termination (VTT) with foldback

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Remote VTT output sensing

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High-Z VTT output in S3

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±15 mA low-noise DDR2/3 buffered reference (VTTREF)

AN2787 Datasheet(PDF) 6 Page - STMicroelectronics