The RICHTEK IC is high quality!  3A Converter With Built-in 85mΩ/40mΩ Low RDS(ON)
Power FETs
 Input Supply Voltage Range : 4.5V to 24V
 Output Voltage Range : 0.791V to 6V
 Advanced Constant On-Time (ACOTTM) Control
 Ultrafast Transient Response
 No Needs For External Compensations
 Optimized for Low-ESR Ceramic Output Capacitors
 0.791V ±1.5% High-Accuracy Feedback Reference Voltage
 Low Quiescent Current (150μA typ.)
 Both HS/LS FETs Protection for Robust Over-Current Protection
 Optional for Operation Modes :
Forced PWM Mode (RT6217B)
Light-load VOUT Ripple Reduction Technology in PSM
 Steady Switching Frequency (500kHz typ.)
 Externally Adjustable Soft-Start
 Monotonic Start-up for Pre-biased Output
 Input Under-Voltage Lockout (UVLO)
 Output Under-Voltage Protection (UVP) with Hiccup Mode
 Over-Temperature Protection (OTP) (Thermal Shutdown)
 Power Good Indication
 Enable Control
 RoHS Compliant and Halogen Free
 Available In TSOT-23-8 (FC) Package