DESCRIPTION

UTC UD05153 is a 1.5MHz Constant On-Time Control PWM step-down converter. It is ideal for portable equipment requiring very high current up to 1.5A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The 2.5V to 5.5V input voltage range makes UTC UD05153 ideally suited for single Li-Ion applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and decreases need of an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage.

FEATURES

* Input Voltage Range :2.5V~5.5V

* Output Voltage: from 0.6V to VIN

* High Efficiency: Up to 90%

* Constant Frequency Operation: 1.5MHz

* Output Current:1.5A

* Quiescent Current: 300uA (input > 4.5V)

* No Schottky Diode Required

* 100% Duty Cycle in Dropout

* 0.6V Reference Allows Low Output Voltages

* COT Mode Operation for Excellent Line and Load

Transient Response

* Current limit, Enable function

* Short Circuit Protect (SCP)

* ≤ 2µA Shutdown Current

* PG pin function for SOT-26 package