AN2808 datasheet(5/40 Pages) STMICROELECTRONICS

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AN2808

Main features

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Main features

1.1

Switching section (VDDQ)

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4.5 to 28-V input voltage range

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0.9 V, ±1% voltage reference

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1.8 V (DDR2) or 1.5 V (DDR3) fixed output voltages

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0.9 to 2.6 V adjustable output voltage

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1.237 V ± 1% reference voltage available

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Very fast load transient response constant on-time control loop

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No-RSENSE current sensing using low-side MOSFETs' RDS(on)

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Negative current limit

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Latched OVP, UVP and thermal shutdown

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Fixed 3 ms Soft-Start

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Selectable pulse-skipping at light loads

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Selectable non-audible (33 kHz) pulse-skip mode

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All ceramic output capacitor applications supported

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Output voltage ripple compensation

1.2

Reference and termination voltages (VTTREF and VTT)

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2 A peak LDO with foldback for VTT

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Remote VTT output sensing

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High-Z VTT output in S3

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Ceramic output capacitors supported

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±15 mA low-noise buffered reference for VTTREF

AN2808 Datasheet(PDF) 5 Page - STMicroelectronics

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