深圳市尚想信息技术有限公司

The SC189 is a high efficiency, synchronous step-down
regulator providing up to 1.5A output current in either
an ultra-small 2mm x 2mm, low profile package or a low
cost SOT23-5 package. The device requires only three
external filter components for a complete step down
regulator solution. The input voltage range is 2.9 to 5.5V
with either factory programmed outputs from 1.0 to 3.3V
or adjustable output via an external resistor divider.
The converter operates at fixed 2.5MHz switching
frequency allowing small L/C filtering components.
The voltage mode architecture is compatible with chip
inductors and capacitors for minimum PCB footprint and
lowest overall system cost. Total footprint of 25mm2
 can
be achieved - making the SC189 the ideal solution for
high density systems. Solution height of <1mm is also
possible.
Up to 93% efficiency is achieved with low RDS(ON) internal
switches. PWM constant frequency operation ensures
low output ripple across the load range. 100% duty-cycle
provides 360mV dropout voltage at 1.5A which extends
the minimum input voltage for 2.5V and 3.3V outputs.
Excellent transient response is achieved with no external
compensation components.
The SC189 provides input under-voltage, output overvoltage, output short circuit and over-temperature
protection to safeguard the device and system under fault
conditions. The regulator provides integrated soft-start to
minimize inrush currents. Standby quiescient current is
less than 1μA.
The SC189 is available in SOT23-5 and a thermally
enhanced 2mm x 2mm x 0.6mm MLPD-UT6 package.