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