描述 Description

UTC?P1785 consists of 2A step-down switching regulatorcontrol which includes a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc with PWM. UTC P1785 can provide low-ripple power, high efficiency, and excellent transient characteristics and an enable function, an over current protect function and a short circuit protect function are built inside,?so the operation frequency will be reduced from 300KHz to 30KHz when OCP or SCP happens. And the PWMcontrol circuit can vary the duty ratio linearly from 100 down to 0%. This converter also includes an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. Also, to minimum external component count an internal compensation block is built in. These ICs can work as step-down switching regulators with the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally. They provide such outstanding

特性 Features

? Soft-start, Current Limit, Enable function
? Thermal Shutdown function
? Built-in internal SW P-channel MOS
? Input voltage: 3.6V to 23V.
? Output voltage: 0.8V to VCC.
? Duty ratio: 0% to 100% PWM control
? Oscillation frequency: 300KHz typ.