UD05251数据手册UTC中文资料规格书

描述 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 UD05251can 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. The output voltage can be regulated as low as 0.8V. 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. The UTC UD05251 is available in adjustable (0.8V to VIN) output voltage.

特性 Features

• 2.6V to 5.5V Input Voltage Range
• Output Voltages from 0.6V to VIN
• High Efficiency: Up to 94%
• 1.2MHz Constant Frequency Operation
• Output Current: 
•  Up to 2.5A Output Current for VIN =2.6V~4V 
•  Up to 3A Output Current for V IN=4V~5.5V
• 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