DESCRIPTION

UTC UD05154 devices are synchronous step-down converters
optimized for small solution size and high efficiency. The devices
integrate switches capable of delivering an output current up to
1.5A. The devices are based on an adaptive on time with valley
current mode control scheme. Typical operating frequency is
1.5MHz at medium to heavy loads. The devices are optimized to
achieve very low output voltage ripple even with small external
components and feature an excellent load transient response.
During a light load, the UD05154 automatically enter into Power
Save Mode at the lowest quiescent current (50μA typ) to maintain
high efficiency over the entire load current range. In shutdown, the
current consumption is reduced to 1μA. The UD05154 provide an
adjustable output voltage via an external resistor divider. The
output voltage start-up ramp is controlled by an internal soft start,
typically 300 μs. Power sequencing is possible by configuring the
Enable pin. Other features like over current protection and over
temperature protection are built in.

FEATURES

2.7V to 5.5V Input Voltage Range
1.5MHz Typical Switching Frequency
Output Current up to 1.5A
Adaptive On-Time Current Control
Power Save Mode for Light Load Efficiency
* 50μA Operating Quiescent Current
* Over Current Protection
* Internal Soft Startup of 300μs (Typ.)
* Adjustable Output Voltage
* Thermal Shutdown Protection