UU28141

DESCRIPTION

The UTC UU28141 is a high frequency, asynchronous boost

converter. The internal MOSFET can support up to 8 White LEDs

for backlighting and OLED power application, and the internal soft

start function can reduce the inrush current.

The UTC UU28141 uses current mode, 1.0MHz fixed frequency

architecture to regulate the LED current, which is set through an

external current sense resistor. Its low 300mV feedback voltage

reduces power loss and improves efficiency. The OVP pin monitors

the output voltage and turns off the converter if an over-voltage

condition is present due to an open circuit condition. The UTC

UU28141 includes under-voltage lockout, current limiting and

thermal shutdown protection preventing damage in the event of an

output overload.

FEATURES

* 2.5V~5.5V operating input voltage range

* Drives up to 8 series White LEDs

* 1.0MHz Fixed Switching Frequency

* Wide range for PWM dimming (200Hz~200KHz)

* Internal 1.4A switching current limit

* Over Voltage Protection (OVP)

* Internal Soft-start Function

* Current limit and Thermal shutdown protection

* Under voltage Lockout

规格书UU28141