The RICHTEK IC is high quality!  6A Converter With Built-In 18mΩ/16mΩ Low RDS(ON) Power FETs
 Input Supply Voltage Range : 2.5V to 6V
 Output Voltage Range : 0.6V to 6V
 Operates Up to 100% Duty Cycle
 Advanced Constant On-Time (ACOT® ) Control
Ultrafast Transient Response
No Needs For External Compensations
Optimized for Low-ESR Ceramic Output Capacitors
 0.6V ±1.5% High-Accuracy Feedback Reference Voltage 35μA Operation Quiescent Current
(RT5789A)
 Robust Over-Current Protection for Both FETs
 Optional for Operation Modes :
Power Saving Mode (PSM) (RT5789A)
Forced PWM Mode (RT5789B)
 Fixed Switching Frequency : 1.5MHz
 Monotonic Start-Up for Pre-Biased Output
 Individual Enable Control Input
 Power Good Indicator
 Built-In Internally Fixed Soft-Start (Typ. 1.5ms)
 100% Duty Cycle Mode
 Internal Output Discharge
 Input Under-Voltage Lockout (UVLO)
 Output Under-Voltage Protection (UVP) with Hiccup Mode
 Over-Temperature Protection
 Available in TSOT-23-8 (FC) Package and UDFN-8L 2.5x2 (FC) Package