L5100 [UTC]
WHITE LED STEP-UP CONVERTER; 白光LED升压转换器
| 型号： | L5100 |
| 厂家： | 
Unisonic Technologies |
| 描述： | WHITE LED STEP-UP CONVERTER |
| 文件： | 总7页 (文件大小：122K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO.,
L5100
LINEAR INTEGRATED CIRCUIT
WHITE LED STEP-UP
CONVERTER
1
2
3
5
4
ꢀ
DESCRIPTION
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.
1
SOT-363
ꢀ
FEATURES
*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
Package
Packing
Normal
L5100-AF5-R
L5100-AN3-R
Lead Free Plating
L5100L-AF5-R
L5100L-AN3-R
SOT-25
SOT-363
Tape Reel
Tape Reel
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1
Copyright © 2005 Unisonic Technologies Co.,
QW-R103-024,A
L5100
LINEAR INTEGRATED CIRCUIT
ꢀ
PIN DESCRIPTION
PIN NO.
SOT-25 SOT-363
PIN NAME
SYMBOL
SW
FUNCTION
Connect inductor/diode here. Minimize trace area at this pin to
reduce EMI.
1
2
1
Switch
2/5
Ground
GND Connect directly to local ground plane.
Reference voltage is 95mV. Connect cathode of lowest LED and
3
3
Feedback
FB
resistor here. Calculate resistor value according to the formula:
FB = 95mV/ILED
R
SHDN Connect to 1.5V or higher to enable device; 0.4V or less to disable
device.
4
5
4
6
Shutdown
Input Supply
VIN
Input Supply Pin. Must be locally bypassed.
ꢀ
BLOCK DIAGRAM
V
IN
FB
3
SW
1
Pin 5 (SOT-25)
Pin 6 (SOT-363)
5
DRIVER
-
+
-
+
95mV
A1
V
1.25V
REF
R
Q
A2
Q1
S
Rc
Cc
RAMP
GENERATOR
Σ
1.2MHz
TIME CONTROL
+
-
0.2Ω
Slope compensation
SHUTDOWN
4
GND
2
SHDN
Pin 2/5 (SOT-363)
Pin 2 (SOT-25)
UNISONIC TECHNOLOGIES CO., LTD
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QW-R103-024,A
L5100
LINEAR INTEGRATED CIRCUIT
ꢀ
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
VIN
RATINGS
12
UNIT
V
Input Voltage
Switch Voltage
Feedback Voltage
Shutdown Voltage
VSW
36
V
VFB
12
V
VSHDN
TOPR
TJ
12
V
℃
℃
℃
Operating Temperature
Junction Temperature
Storage Temperature
0 ~ +70
+125
-40 ~ +150
TSTG
ꢀ
ELECTRICAL CHARACTERISTICS (Ta=25℃, VIN=3V, VSHDN=3V, unless otherwise specified.)
PARAMETER
SYMBOL
VIN
TEST CONDITIONS
MIN
2.5
87
TYP
MAX
12
UNIT
V
Operating Voltage
Feedback Voltage
Shutdown Voltage ON
Shutdown Voltage OFF
Switch VCESAT
VFB
ISW=100mA, Duty Cycle=66%
95
104
mV
V
VON
1.5
VOFF
0.3
V
VCESAT(SW) ISW=250mA
ISW
360
320
1.8
0.1
0.01
60
mV
mA
mA
µA
µA
µA
nA
MHz
%
Switch Current Limit
SHDN=0V
Icc
2.5
1.0
5
Supply current
Switch Leakage Current
Shutdown Pin Bias Current
Feedback Pin Bias Current
Switching Frequency
ISW(OFF)
ISHDN
IFB
VSW=5V
10
0.8
85
45
100
1.6
fOSC
1.2
90
Maximum Duty Cycle
DC
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QW-R103-024,A
L5100
LINEAR INTEGRATED CIRCUIT
ꢀ
TYPICAL APPLICATION CIRCUIT
Two LED Efficiency
86
84
L
VIN=3.6V
22μH
D
VIN
3V ~ 5V
82
80
C
1μF
IN
C
OUT
V
DC
VIN=3V
0.22μF
DIMMING
VIN
SW
90k
5k
78
76
SHDN
GND
FB
R1
2Ω
74
72
70
Li-Ion to Two White LEDs
0
10
20
LED CURRENT(mA)
30
40
Three LED Efficiency
90
85
80
75
70
65
60
L
22μF
D
VIN
3V ~ 5V
C
1μF
IN
V
DC
C
OUT
DIMMING
0.22μF
V
IN
SW
FB
15mA
90k
5k
VIN=3V
VIN=3.6V
SHDN
GND
R1
6.34Ω
Li-Ion to Three White LEDs
0
5
10
LED CURRENT(mA)
15
20
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QW-R103-024,A
L5100
LINEAR INTEGRATED CIRCUIT
ꢀ
TYPICAL APPLICATION CIRCUIT (cont.)
Four LED Efficiency
85
80
75
70
65
L
22 µH
D
V
IN
C
1 µF
IN
3V ~ 5V
VDC
C
OUT
DIMMING
0. 22µF
VIN=3V
VIN
SW
FB
k
90
VIN=3.6V
5k
SHDN
GND
R1
4Ω
Li- Ion to Four White LEDs
0
5
10
15
20
LOAD CURRENT (mA)
Five LED Efficiency
85
L
22μH
D
VIN
3V ~ 5V
CIN
C
OUT
V
DC
80
75
70
65
1μF
0.22μF
DIMMING
V
IN
SW
VIN=3V
90k
5k
SHDN
GND
FB
R1
4Ω
VIN=3.6V
Li-Ion to Five White LEDs
0
2
4
6
8
10
12
LOAD CURRENT (mA)
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QW-R103-024,A
L5100
LINEAR INTEGRATED CIRCUIT
ꢀ
TYPICAL APPLICATION CIRCUIT (cont.)
Seven LED Efficiency
85
80
75
70
65
L
22µ H
D
V
5 V
IN
C
1µF
IN
VDC
C OUT
0. 22µF
DIMMING
V
IN
SW
FB
90 k
5k
SHDN
GND
R1
4
Ω
5
V to Seven White LEDs
1
0
1
5
0
5
LOAD CURRENT (mA)
UNISONIC TECHNOLOGIES CO., LTD
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QW-R103-024,A
L5100
LINEAR INTEGRATED CIRCUIT
ꢀ
TYPICAL CHARACTERISTICS
Quiescent Current
Current Limit vs Duty Cycle
350
300
250
2.2
25℃
2.0
1.8
1.6
1.4
1.2
1.0
80℃
200
150
0.8
0.6
0.4
100
50
0.2
0
0
0
20
40
60
80
100
0
2
4
6
8
10
(%)
VIN (V)
DUTY CYCLE
* UTC L5100 is guaranteed the operating temperature
range of0℃ ~ 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
7
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QW-R103-024,A
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