UC3550中文资料PWM CONTROLLED， PWM/PFM SWITCHABLE STEP-UP DC-DC CONTROLLER数据手册UTC规格书

描述 Description

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 (chip enable) function that reduces power consumption during shut-down mode.   That typically operated from a single-or dual-cell battery packs. It have a driver pin ,ext pin, for connecting to an external transistor(NMOS or NPN). a lower ON-resistance external transistor can obtain larger output current. With only external components, this series allow a simple means to accommodate high output current applications.   The UTC UC3550 series goes automatically into skip switching cycles under light load condition to maintain high efficiency.

特性 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
· High Output Current up to 1000mA (VIN = 2.0V, VOUT =3.3V)