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UU28141 Datasheet Preview

UU28141 Datasheet

1.4A BOOST

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UNISONIC TECHNOLOGIES CO., LTD
UU28141
1.4A BOOST FOR WHITE LED
DRIVER
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
ORDERING INFORMATION
Ordering Number
UU28141G-AG6-R
Package
SOT-26
CMOS IC
Packing
Tape Reel
MARKING
www.unisonic.com.tw
Copyright © 2016 Unisonic Technologies Co., Ltd
1 of 5
QW-R125-040.B




UTC

UU28141 Datasheet Preview

UU28141 Datasheet

1.4A BOOST

No Preview Available !

UU28141
PIN CONFIGURATION
SW 1
GND 2
6 VCC
5 OVP
FB 3
4 EN
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
PIN NAME
SW
GND
FB
EN
OVP
VCC
DESCRIPTION
Switching Pin.
Ground Pin.
Feedback Pin.
Chip Enable & Dimming pin. Active high. Internal pull low.
Over voltage detect pin.
Power Input Pin.
BLOCK DIAGRAM
VCC
UVLO and
POR
REFERENCE
and BIAS
SOFTSTART
LPF
+
EA
FB -
Shutdown
Enable
Logic
10ms
EN
Thermal
Shutdown
ILIMIT
+
- COMP
+
PWM
CONTROL
LOGIC
Current
Sense
OVP
DRIVER
OSCILLATOR
CMOS IC
SW
OVP
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 5
QW-R125-040.B


Part Number UU28141
Description 1.4A BOOST
Maker UTC
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