AN2808 Datasheet, PDF (5/40 Pages) STMicroelectronics – The PM6670S device is a complete

AN2808
1
Main features
Main features
1.1
Switching section (VDDQ)
● 4.5 to 28-V input voltage range
● 0.9 V, ±1% voltage reference
● 1.8 V (DDR2) or 1.5 V (DDR3) fixed output voltages
● 0.9 to 2.6 V adjustable output voltage
● 1.237 V ± 1% reference voltage available
● Very fast load transient response constant on-time control loop
● No-RSENSE current sensing using low-side MOSFETs' R_DS(on)
● Negative current limit
● Latched OVP, UVP and thermal shutdown
● Fixed 3 ms Soft-Start
● Selectable pulse-skipping at light loads
● Selectable non-audible (33 kHz) pulse-skip mode
● All ceramic output capacitor applications supported
● Output voltage ripple compensation
1.2
Reference and termination voltages (VTTREF and VTT)
● 2 A peak LDO with foldback for VTT
● Remote VTT output sensing
● High-Z VTT output in S3
● Ceramic output capacitors supported
● ±15 mA low-noise buffered reference for VTTREF
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