SC1109: Synchronous PWM Controller With Dual Low-Dropout Regulator Controllers

• Dual linear controllers
• LDOs track input voltage within 200 mV (function of the MOSFETs used) until regulation
• Integrated drivers
• Power-good signal (SC1109A, SC1109B)
• Soft start
• Lossless current sense
• Programmable over-current limit (SC1109C)
• Fixed frequency 200 kHz (SC1109A, SC1109C)
• Fixed frequency 500 kHz (SC1109B)
• SO-16 package

Typical Application Circuit

Click diagram to enlarge

• Pentium® III Motherboards
• Triple power supplies

SOIC-16

• SC1109ACSTR: Package Minimum Tape & Reel Only
• SC1109ACSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only