SC483: Dual Synchronous Buck Pseudo-Fixed-Frequency Power-Supply Controller

• Constant on-time for fast dynamic response
• Programmable VOUT range = 0.5 – VCCA
• VBAT range = 1.8 V – 25 V
• DC current sense using low-side RDS(ON) sensing or sense resistor
• Resistor-programmable frequency
• Cycle-by-cycle current limit
• Digital soft-start
• Separate PSAVE option for each switcher
• Over-voltage/Under-voltage fault protection
• 10 µA typical shutdown current
• Low quiescent power dissipation
• Two power-good indicators
• 1% reference over full temperature range (2% system DC accuracy)
• Integrated gate drivers with soft switching
• Separate enables
• 28-lead TSSOP
• Industrial temperature range
• Output soft discharge upon shutdown

Typical Application Circuit

Click diagram to enlarge

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

TSSOP-28

• SC483ITSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only