Press Center
Home About us Products Support Quality & Certification Career Contact us
• Power Management
    Linear Regulators
    Low Dropout Linear Regulators
    DDR Termination Regulators
    Shunt Reference Regulators
    Step Down Switching Regulators
    Switching Regulator
    Step-Up DC-DC Converter
    PWM Controller
    White LED Driver
    Supervisory Circuit
    Voltage Detection and System R
    USB Power Switch
    Power Factor Control
    Li-Battery Protection or Charg
    FET Bias Controllers
    Combo IC
    Inverting DC-DC Converter
• Amplifier / Comparator
    Audio Amplifiers
    Operational Amplifier
    Voltage Comparator
• Analog Switches
    Video Signal Switch
    Analog Multiplexers, Demultipl
• Hall ICs
• Special Application ICs
    Motor Controller IC
    Interface and Driver Circuit
    Telecommunication Circuit
    Melody IC
    Alarm /Sound Generator IC
    Remote Controller IC
    Television Circuit
    Leakage Current Detector
    Automotive IC
    A-D or D-A Converters
    Radio and Cassette Recorder Ci
    Mouse&Keyboard Controller
    Transient Voltage Suppressors
    Sense Monitor
    Video Filter
    ZCB snubber
• Logic
    Power Mosfet
• SCRs
Home > Step-Up DC-DC Converter
UC3550 Datasheet


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.

* Input Voltage Range0.9~8V
* Output Voltage Range1.8~6V 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)
About us  |  Products  |  Contact us
Copyright 2011 UTC All received