UD05251

DESCRIPTION

The UTC UD05251 is a 1.2MHz constant frequency current

mode PWM step-down converter. It is ideal for portable

equipment requiring very high current up to 2.5A from single-cell

Lithium-ion batteries while still achieving over 90% efficiency

during peak load conditions.

The UTC UD05251 also can run at 100% duty cycle for low

dropout operation, extending battery life in portable systems while

light load operation provides very low output ripple for noise

sensitive applications.

The UTC UD05251 can supply up to 2.5A output current from

a 2.6V to 4V input voltage and up to 3A output current from a 4V

to 5.5V input voltage. These devices are available in fixed output

voltages from 0.6V to Vin in increments of 0.05V and an

adjustable output version. The high switching frequency

minimizes the size of external components while keeping

switching losses low. The internal slope compensation setting

allows the device to operate with smaller inductor values to

optimize size and provide efficient operation.

FEATURES

* 2.6V to 5.5V Input Voltage Range

* Adjustable Output Voltages from 0.6V to V IN

Fixed output voltage from 0.6V to V IN in increments of 0.05V

* High Efficiency: Up to 94%

* 1.2MHz Constant Frequency Operation

* Output Current: Up to 2.5A Output Current

* No Schottky Diode Required

* Current Mode Operation for Excellent Line and Load Transient

Response

* Current limit, Enable function

* Short Circuit Protect (SCP)

* Build-in Soft Start function

* ≤1µA Shutdown Current

规格书UD05251