UC3550 Datasheet - UTC

UC3550 PWM/PFM SWITCHABLE STEP-UP DC-DC CONTROLLER

The UTC UC3550 series is a compact, high efficiency, step-up DC/DC controllers includes an error amplifier, oscillator, PWM comparator, skip cycle comparator, voltage reference, soft-start, and high speed lower ON-resistance driver for driving external power devices (NMOS or NPN) ,Additionally, a CE.

UC3550 Features

* Input Voltage Range：0.9~8V

* Output Voltage Range：1.8~6V Programmable in 0.1V with High Accuracy ± 2.5%

* High Efficiency 88% (Typ.)

* Low Start-up Voltage of 0.9V Typical at IOUT = 1.0mA

* Oscillator Frequency: 300kHz.(±20%)

* Chip Enable Pin with Pull-up Current Source

UC3550_UTC.pdf