STEVAL-ISA051V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – Complete DDR2/3 memory power supply controller evaluation board based on the PM6670S

STEVAL-ISA051V1
Features
Complete DDR2/3 memory power supply controller
evaluation board based on the PM6670S
Data Brief
■ 4.5 V 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 V to 2.6 V adjustable output voltage
■ 1.237 V ±1% reference voltage available
■ Very fast load transient response
■ Constant on-time loop control
■ No R_SENSE current sensing using the R_DS(on)
of the low-side MOSFETs
■ Negative current limit
■ Latched OVP, UVP and thermal shutdown
■ Fixed 3 ms soft-start
■ Selectable pulse-skipping at light load
■ Selectable no-audible (33 kHz) pulse-skip
mode
■ All ceramic output capacitors application
supported
■ Output voltage ripple compensation
STEVAL-ISA051V1
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.
Description
This evaluation board is based on the PM6670S
and represents a complete DDR2/3 power supply
regulator for portable applications designed to
meet JEDEC specifications. It integrates a
constant on-time (COT) buck controller, a 2 Apk
sink/source low drop-out regulator and a 15 mA
low noise buffered reference. The COT
architecture assures fast transient response
supporting both polymeric and ceramic output
capacitors. An embedded integrator control loop
compensates the DC voltage error due to the
output ripple. The 2 Apk sink/source linear
regulator provides the memory termination
voltage with fast load transient response.
February 2008
Rev 1
For further information contact your local STMicroelectronics sales office.
1/4
www.st.com
4