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