Datasheet

UNISONIC TECHNOLOGIES CO., LTD
L5109
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CMOS IC
WHITE LED STEP-UP
CONVERTER

DESCRIPTION
The UTC L5109 is an inductor-based DC/DC converter
designed to drive up to six white LEDs in series or 2 rows of
LEDs with 5 for each in parallel for backlight. Only one feedback
resistor is needed to control the LED current and obtain required
brightness.

6
5
4
1
2
3
SOT-26
FEATURES
* Inherently Uniform LED Current
* High Efficiency up to 83.5%
* No Need for External Schottky Diode
* Over Output Voltage Protection
* OVP
* 1.2MHz Switching Frequency

ORDERING INFORMATION
Ordering Number
L5109G-AG6-R

Package
SOT-26
Packing
Tape Reel
MARKING
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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L5109
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
PIN CONFIGURATION

PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6

PIN NAME
SW
GND
FB
CTRL
VOUT
VIN
CMOS IC
DESCRIPTION
Switch Pin.
Ground Pin
Feedback Voltage.
Shutdown and Dimming Pin.
Output Pin.
Input Supply Pin.
BLOCK DIAGRAM
FB
SW
3
1
5
VOUT
SS
6
VIN
VREF
200mV
OVP
+
DRIVER
-
EA
+
PWM
+
R
Q1
Q
S
COMPARATOR
∑
+
4
2
GND
CTRL
RAMP
GENERATOR
1.2 MHz OSC
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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CMOS IC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
VIN
20
V
SW Voltage
VSW
38
V
FB Voltage
VFB
20
V
CTRL Voltage
VCTRL
20
V
Operating Junction Temperature
TOPR
+150
°C
Storage Temperature Range
TSTG
-65 ~ 150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

THERMAL DATA
PARAMETER
Junction to Ambient
Junction to Case

SYMBOL
θJA
θJC
UNIT
°С/W
°С/W
RATINGS
-40 ~ 85
2.5 ~ 16
16
UNIT
°C
V
V
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Operating Temperature Range
Input Voltage
CTRL Voltage

RATINGS
265
60
SYMBOL
TOPR
VIN
VCTRL
ELECTRICAL CHARACTERISTICS (VIN=3V, VCTRL=3V, TA=25°C, unless otherwise specified.)
PARAMETER
Minimum Operating Voltage
Feedback Voltage
FB Pin Bias Current
Supply Current
Shutdown Quiescent Current
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
SYMBOL
VIN
VFB
IFB
ICC
IQ
f
DMAX
ILIMIT
Switch VCE Saturation Voltage
Switch Leakage Current
VCESAT
CTRL Pin Voltage
VCTRL
CTRL Pin Bias Current
ICTRL
OVP Voltage
Schottky Forward Drop
VOV
VDROP
TEST CONDITIONS
IOUT=20mA, 4 LEDs,
TA=-40°C~85°C
VFB=VIN, No Switching
VCTRL=0V
MIN
2.5
TYP
MAX
16
UNIT
V
188
200
212
mV
35
2.5
3.2
1.2
93
550
550
360
0.01
100
3.2
5.0
nA
mA
µA
MHz
%
2.0
90
TA=25°C, D=40%
TA=25°C, D=80%
ISW=250mA
VSW=5V
High
Low
Schottky Leakage Current
Soft Start Time
ID=150mA
Reverse Voltage VR=23V
Reverse Voltage VR=27V
t
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5
1.8
40
TA=85°C
TA=-40°C
mA
55
50
75
29
0.7
0.1
300
0.05
72
mV
µA
V
µA
V
V
4
150
µA
µS
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CMOS IC
TYPICAL APPLICATION CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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