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PM6670 Datasheet(PDF) 1 Page - STMicroelectronics |
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PM6670 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 53 page  Preliminary Data This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. March 2007 Rev 1 1/53 53 PM6670 Complete DDR2/3 memory power supply controller Features switching ■ Switching section (VDDQ) – 4.5V to 28V input voltage range – 0.9V, ±1% voltage reference – 1.8V (DDR2) or 1.5V (DDR3) fixed output voltages – 0.9V to 2.6V adjustable output voltage – 1.237V ±1% reference voltage available – Very fast load transient response using constant on-time control loop –No RSENSE current sensing using low side MOSFET’s RDS(ON) – Negative current limit – Latched OVP and UVP – Soft start internally fixed at 3ms – Selectable pulse skipping at light load – Selectable No-Audible (33KHz) pulse skip mode – Ceramic output capacitors supported – Output voltage ripple compensation ■ VTT LDO and VTTREF – 2Apk LDO with foldback for VTT – Remote VTT sensing – High-Z VTT output in S3 – Ceramic output capacitors supported – ±15mA Low noise buffered reference Applications ■ DDR2/3 memory supply ■ Notebook computers ■ Handheld and PDAs ■ CPU and chipset I/O supplies ■ SSTL18, SSTL15 and HSTL bus termination Description The device PM6670 is a complete DDR2/3 power supply regulator designed to meet JEDEC specifications. It integrates a Constant On-Time (C.O.T.) buck controller, a 2Apk sink/source Low Drop Out regulator and a 15mA low noise buffered reference. The C.O.T. architecture assures fast transient response supporting both electrolytic and ceramic output capacitors. An embedded integrator control loop compensates the DC voltage error due to the output ripple. The 2Apk sink/source linear regulator provides the memory termination voltage with fast load transient response. The device is fully compliant with system sleep states S3 and S4/S5, providing LDO output high impedance in Suspend-To-RAM and Tracking Discharge of all outputs in Suspend-To-Disk. VFQFPN-24 4x4 www.st.com Table 1. Device summary Part number Package Packaging PM6670 VFQFPN-24 4x4 (Exposed Pad) Tube |
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