UTC L5100 White led step-up converter Datasheet

UNISONIC TECHNOLOGIES CO.,
L5100
LINEAR INTEGRATED CIRCUIT
WHITE LED STEP-UP
CONVERTER
2
1
3
5
DESCRIPTION
4
SOT-25
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 allowing 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
1
SOT-363
*Pb-free plating product number: L5100L
* 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 0.22µF
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
L5100-AF5-R
L5100L-AF5-R
L5100-AN3-R
L5100L-AN3-R
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Copyright © 2005 Unisonic Technologies Co.,
Package
Packing
SOT-25
SOT-363
Tape Reel
Tape Reel
1
QW-R103-024,A
L5100
LINEAR INTEGRATED CIRCUIT
PIN DESCRIPTION
PIN NO.
SOT-25 SOT-363
PIN NAME
1
1
Switch
2
2/5
Ground
3
3
Feedback
4
4
Shutdown
5
6
Input Supply
SYMBOL
FUNCTION
Connect inductor/diode here. Minimize trace area at this pin to
reduce EMI.
GND Connect directly to local ground plane.
Reference voltage is 95mV. Connect cathode of lowest LED and
FB
resistor here. Calculate resistor value according to the formula:
RFB = 95mV/ILED
SHDN Connect to 1.5V or higher to enable device; 0.4V or less to disable
device.
VIN
Input Supply Pin. Must be locally bypassed.
SW
BLOCK DIAGRAM
VIN
Pin 5 (SOT-25)
Pin 6 (SOT-363 ) 5
VREF
1.25V
FB
SW
3
1
95mV
A1
+
DRIVER
A2
+
Rc
R
S
Q
Q1
Cc
Σ
RAMP
GENERATOR
1 .2MHz
TIME CONTROL
+
SHUTDOWN
SHDN
Slope compensation
4
0 .2Ω
2
GND
Pin 2 /5 (SOT-363 )
Pin 2 (SOT-25 )
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2
QW-R103-024,A
L5100
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Voltage
Switch Voltage
Feedback Voltage
Shutdown Voltage
Operating Temperature
Junction Temperature
Storage Temperature
SYMBOL
VIN
VSW
VFB
VSHDN
TOPR
TJ
TSTG
RATINGS
12
36
12
12
0 ~ +70
+125
-40 ~ +150
UNIT
V
V
V
V
℃
℃
℃
ELECTRICAL CHARACTERISTICS (Ta=25℃, VIN=3V, VSHDN=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
IFB
fOSC
DC
TEST CONDITIONS
ISW =100mA, Duty Cycle=66%
TYP
95
MAX
12
104
0.3
ISW =250mA
SHDN=0V
VSW =5V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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
%
3
QW-R103-024,A
L5100
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
Two LED Efficiency
86
L
22μH
CIN
1μF
SW
SHDN
FB
82
COUT
0.22μF
VDC
DIMMING
VIN
VIN=3.6V
84
D
90k
5k
R1
2Ω
GND
VIN=3V
EFFICIENCY(%)
VIN
3V ~ 5V
80
78
76
74
72
Li-Ion to Two White LEDs
70
0
VDC
DIMMING
15mA
90k
FB
GND
85
COUT
0.22μF
SW
SHDN
40
D
CIN
1μF
VIN
30
20
LED CURRENT (mA)
Three LED Efficiency
90
L
22μF
5k
R1
6.34Ω
Li-Ion to Three White LEDs
EFFICIENCY (%)
VIN
3V ~ 5V
10
80
VIN=3V
70
65
60
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
VIN=3.6V
75
0
5
10
15
LED CURRENT (mA)
20
4
QW-R103-024,A
L5100
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT (cont.)
Four LED Efficiency
85
D
C IN
1 µF
VDC
DIMMING
VIN
SW
90 k
5k
FB
SHDN
C OUT
0 . 22 µ F
R1
4Ω
GND
80
E FFICIE NCY (% )
VIN
3V ~ 5V
L
22 µH
VIN=3V
VIN =3 .6 V
75
70
Li- Ion to Four White LEDs
65
0
5
10
20
15
LOAD CURRENT (mA)
Five LED Efficiency
85
L
22μH
CIN
1μF
COUT
0.22μF
VDC
DIMMING
VIN
SW
90k
5k
SHDN
FB
GND
R1
4Ω
80
EFFICIENCY(%)
VIN
3V ~ 5V
D
VIN=3V
75
VIN=3.6V
70
Li-Ion to Five White LEDs
65
0
2
4
6
8
10
12
LOAD CURRENT (mA)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5
QW-R103-024,A
L5100
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT (cont.)
Seven LED Efficiency
85
L
22 µ H
D
C IN
1µ F
VDC
DIMMING
V IN
C OUT
0. 22 µ F
SW
90 k
5k
SHDN
FB
GND
R1
4Ω
80
EFFICIENCY (%)
V IN
5V
75
70
5 V to Seven White LEDs
65
0
5
LOAD CURRENT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
1
5
1
0
(mA )
6
QW-R103-024,A
L5100
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
Quiescent Current
Current Limit vs Duty Cycle
350
2 .2
25℃
2 .0
300
1 .8
80℃
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℃ ~ 75℃.
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
7
QW-R103-024,A
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