SC488: Complete DDR1/2/3 Memory Power Supply

• Constant on-time controller for fast dynamic response on VDDQ
• DDR1/DDR2/DDR3 compatible
• VDDQ = fi xed 1.8V or 2.5V, or adjustable from
• 1.5V to 3.0V
• 1.5% internal reference (2.5% system accuracy)
• Resistor programmable on-time for VDDQ
• VCCA/VDDP range = 4.5V to 5.5V
• VIN range = 2.5V to 25V
• VDDQ DC current sense using low-side RDS(ON)
• Sensing or external RSENSE in series with low-side FET
• Cycle-by-cycle current limit for VDDQ
• Digital soft-start for VDDQ
• Analog soft-start for VTT/REF
• Smart over-voltage VDDQ protection against
• source-current loads
• Combined EN and PSAVE pin for VDDQ
• Over-voltage/under-voltage fault protection
• Power good output
• Separate VCCA and VDDP supplies
• VTT/REF range = 0.75V – 1.5V
• VTT source/sink 2.8A peak
• Internal resistor divider for VTT/REF
• VTT is high impedance in S3
• VDDQ, VTT, REF are actively discharged in S4/S5
• 24 lead MLPQ (4x4 mm) lead-free package

Typical Application Circuit

Click diagram to enlarge

• Notebook computers
• CPU I/O supplies
• Handheld terminals and PDAs
• LCD monitors
• Network power supplies

MLPQ-24

• SC488MLTRT: Lead-free, RoHS and WEEE compliant, 3000 pcs. Tape & Reel