DESCRIPTION

The UTC UD05125 is a constant frequency, current mode,

PWM step-down converter. The device integrates a main switch

and a synchronous rectifier for high efficiency. The 2.5V to 5.5V

input voltage range makes the UTC UD05125 ideal for powering

portable equipment. Switching frequency is internally set at

1.5MHz, allowing the use of small surface mount inductors and

capacitors. The internal synchronous switch increases efficiency

while eliminates the need for an external Schottky diode.

The UTC UD05125 also includes input under-voltage lockout,

output under-voltage protection, and over- temperature protection

 to provide safe and smooth operation in all working conditions.

FEATURES

* 2.5V to 5.5V Input Voltage Range

* 1.2A Available Load Current

* 1.5MHz Switching Frequency in CCM

* Low RDS(ON) for Internal Switches:

 High-side: 200mΩ

 Low-side: 150mΩ

* 65μA Typical Quiescent Current

* Soft Start Time: 1ms

* Current Mode Control for Excellent Transient Response

* Cycle-by-cycle Peak Current Limitation

* Input Under-Voltage Lockout

* Input Over-Voltage Protection

* Short Circuit with Hiccup Mode

* Over-temperature protection

* Green & Pb Free