Datasheet

UNISONIC TECHNOLOGIES CO., LTD
L5100
LINEAR INTEGRATED CIRCUIT
WHITE LED STEP-UP
CONVERTER

DESCRIPTION
The UTC L5100 is a STEP-UP DC/DC Converter and
designed
for driving white LEDs with a constant current. It can drive several LEDs
in series by a Li-Ion cell. UTC L5100 switches at a high frequency
1.2MHz, so it can allow the use of tiny external components. The output
capacitor can be as small as 0.22μF; saving space and cost compare
with alternative other solutions. The low 95mV feedback voltage
minimizes power loss in the current setting resistor can have better
efficiency.

FEATURES
* Inherently Matched LED Current
* High Efficiency: 83% Typical
* Drives Up to Four LEDs from a 3.2V Supply
* Drives Up to Six LEDs from a 5V Supply
* 36V Rugged Bipolar Switch
* 1.2MHz Switching Frequency
* Uses Tiny 1mm Tall Inductors
* Output Capacitor can be Small to only 0.22μ F

ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
L5100L-AF5-R
L5100G-AF5-R

Package
Packing
SOT-25
Tape Reel
MARKING
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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L5100
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
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO.
1
2
PIN NAME
SW
GND
3
FB
4
SHDN
5
VIN
DESCRIPTION
Switch. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.
Ground. Connect directly to local ground plane.
Feedback. Reference voltage is 95mV. Connect cathode of lowest LED and resistor
here. Calculate resistor value according to the formula: RFB = 95mV/ILED
Shutdown. Connect to 1.5V or higher to enable device; 0.4V or less to disable device.
Input Supply Pin. Must be locally bypassed.
BLOCK DIAGRAM
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L5100

LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
VIN
12
V
Switch Voltage
VSW
36
V
Feedback Voltage
VFB
12
V
V SHDN
12
V
Shutdown Voltage
Junction Temperature
TJ
+125
°C
Operating Junction Temperature
TJ
-40~+85
°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 (in free air)

SYMBOL
θJA
RATINGS
256
UNIT
°C/W
ELECTRICAL CHARACTERISTICS (TA=25°C, VIN=3V, V SHDN =3V, unless otherwise specified.)
PARAMETER
Operating Voltage
Feedback Voltage
Shutdown Voltage ON
Shutdown Voltage OFF
Switch VCESAT
Switch Current Limit
SYMBOL
VIN
VFB
VON
VOFF
VCESAT(SW)
ISW
Supply current
Switch Leakage Current
Shutdown Pin Bias Current
Feedback Pin Bias Current
Switching Frequency
Maximum Duty Cycle
ICC
ISW(OFF)
ISHDN
TEST CONDITIONS
ISW=100mA, Duty Cycle=66%
TYP
95
MAX
12
104
0.3
ISW=250mA
SHDN =0V
VSW=5V
IFB
fOSC
DC
UNISONIC TECHNOLOGIES CO., LTD
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MIN
2.5
87
1.5
10
0.8
85
360
320
1.8
0.1
0.01
60
45
1.2
90
2.5
1.0
5
100
1.6
UNIT
V
mV
V
V
mV
mA
mA
µA
µA
µA
nA
MHz
%
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EFFICIENCY (%)
EFFICIENCY(%)
TYPICAL APPLICATION CIRCUITS
EFFICIENCY (%)

LINEAR INTEGRATED CIRCUIT
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L5100

LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUITS (Cont.)
Five LED Efficiency
85
L=22μH
VIN
3V ~ 5V
D
CIN
1μF
COUT
VDC
DIMMING
VIN
0.22μF
80
SW
SHDN
FB
VIN=3V
90k
5k
75
R1
4Ω
GND
VIN=3.6V
70
Li - Ion to Five White LEDs
65
0
2
4
6
8
10
12
LOAD CURRENT (mA)
Six LED Efficiency
85
V IN
5V
L=22μH
C IN
1µF
D
VDC
DIMMING
V IN
C OUT
0. 22µF
80
SW
90k
SHDN
FB
75
5k
GND
R1
4Ω
70
5 V to Six White LEDs
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65
0
1
0
LOAD CURRENT (mA)
5
1
5
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LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS

Quiescent Current
Current Limit vs Duty Cycle
350
2 .2
25°C
2 .0
300
1 .8
80°C
CURRENT LIMIT (mA)
1 .6
IQ (mA)
1 .4
1 .2
1 .0
0 .8
0 .6
0 .4
250
200
150
100
50
0 .2
0
0
0
2
4
6
8
10
VIN (V)
0
20
40
60
80
100
DUTY CYCLE (%)
* UTC L5100 is guaranteed the operating temperature
range of 0°C ~ 75°C.
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.
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