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Home > Step Down Switching Regulators
UD05209 Datasheet






UTC UD05209 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 2A.

The devices are based on an adaptive on time with valley current

mode control scheme. Typical operating frequency is 1.5 MHz 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. In shutdown, the

current consumption is reduced to 1μA. The UD05209 provide an

adjustable output voltage via an external resistor divider. The

output voltage start-up ramp is controlled by an internal soft start,

typically 250 μs. Power sequencing is possible by configuring the

Enable pin. Other features like over current protection and over

temperature protection are built in.




* 2.7V to 5.5V Input Voltage Range

* 1.5MHz Typical Switching Frequency

* Output Current up to 2A

* Adaptive On-Time Current Control

* Over Current Protection

* Internal Soft Startup of 250μs (Typ.)

* Adjustable Output Voltage

* Thermal Shutdown Protection

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