The RICHTEK IC is high quality!  2A Converter Integrated 100mΩ and 80mΩ FETs in WDFN-8SL 2x2 Package
 Input Supply Voltage Range : 2.5V to 5.5V
 Output Voltage Range : 0.45V to VIN
 Advanced Constant On-Time (ACOTTM) Control
Ultrafast Transient Response
No Needs for External Compensations
Optimized for Low-ESR Ceramic Output Capacitors
 High Accuracy Feedback Reference Voltage : 0.45V± 1%
 Low Quiescent Current : 30μA
 Fixed Switching Frequency : 2.7MHz
 Internally Fixed Soft-Start (typ. 150μs)
 Safe Start-Up from Pre-biased Output
 Input Under-Voltage Lockout (UVLO)
 Output Under-Voltage Protection (UVP) with Hiccup Mode
 Over-Temperature Protection (OTP) (Thermal Shutdown)
 Enable Control
 Power Good Indication
 RoHS Compliant and Halogen Free