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UNISONIC TECHNOLOGIES CO., L5100
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 allowing the use of tiny external components. The output capacitor can be as small as 0.22F, 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.
LINEAR INTEGRATED CIRCUIT
2 3
1
5 4
SOT-25
1
SOT-363
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 0.22F
*Pb-free plating product number: L5100L
ORDERING INFORMATION Ordering Number Normal Lead Free Plating L5100-AF5-R L5100L-AF5-R L5100-AN3-R L5100L-AN3-R Package SOT-25 SOT-363 Packing Tape Reel Tape Reel
www.unisonic.com.tw Copyright (c) 2005 Unisonic Technologies Co.,
1
QW-R103-024,A
L5100
PIN DESCRIPTION
PIN NO. SOT-25 SOT-363 1 2 3 4 5 1 2/5 3 4 6 PIN NAME Switch Ground Feedback Shutdown Input Supply SYMBOL SW
LINEAR INTEGRATED CIRCUIT
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.
BLOCK DIAGRAM
VIN Pin 5 (SOT-25) Pin 6 (SOT-363 ) 5
FB 3
SW 1
VREF 1.25V
95mV
A1 +
Rc Cc
A2 +
DRIVER R S Q Q1
RAMP GENERATOR
1 .2MHz TIME CONTROL
+
SHUTDOWN 4
0 .2
Slope compensation
2 GND
SHDN
Pin 2 /5 (SOT-363 ) Pin 2 (SOT-25 )
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2
QW-R103-024,A
L5100
ABSOLUTE MAXIMUM RATINGS
PARAMETER Input Voltage Switch Voltage Feedback Voltage Shutdown Voltage Operating Temperature Junction Temperature Storage Temperature
LINEAR INTEGRATED CIRCUIT
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 Supply current Switch Leakage Current Shutdown Pin Bias Current Feedback Pin Bias Current Switching Frequency Maximum Duty Cycle SYMBOL VIN VFB VON VOFF VCESAT(SW) ISW Icc ISW(OFF) ISHDN IFB fOSC DC TEST CONDITIONS ISW =100mA, Duty Cycle=66% MIN 2.5 87 1.5 TYP 95 MAX 12 104 0.3 ISW =250mA SHDN=0V VSW =5V 10 0.8 85 360 320 1.8 0.1 0.01 60 45 1.2 90 UNIT V mV V V mV mA mA A A A nA MHz %
2.5 1.0 5 100 1.6
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3
QW-R103-024,A
L5100
TYPICAL APPLICATION CIRCUIT
LINEAR INTEGRATED CIRCUIT
86 L 22H VIN 3V ~ 5V CIN 1F VIN 84 COUT 0.22F 82
Two LED Efficiency
VIN=3.6V
D VDC DIMMING SW 90k 5k R1 2
VIN=3V
EFFICIENCY(%)
80 78 76 74 72
SHDN GND
FB
Li-Ion to Two White LEDs
70 0 10 30 20 LED CURRENT (mA) 40
VIN 3V ~ 5V
L 22F CIN 1F VIN SW
90 D VDC DIMMING
15mA
Three LED Efficiency
COUT 0.22F
85
EFFICIENCY (%)
80 VIN=3V 75 VIN=3.6V
90k SHDN GND FB 5k R1 6.34
70
Li-Ion to Three White LEDs
65
60
0
5
10 15 LED CURRENT (mA)
20
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4
QW-R103-024,A
L5100
TYPICAL APPLICATION CIRCUIT (cont.)
LINEAR INTEGRATED CIRCUIT
Four LED Efficiency
85 L 22 H C IN 1 F VIN SW D VDC DIMMING 90 k 5k R1 4 C OUT 0 . 22 F 80
VIN 3V ~ 5V
E FFICIE NCY (% )
VIN=3V VIN =3 .6 V 75
SHDN GND
FB
70
Li- Ion to Four White LEDs
65 0 5 10 LOAD CURRENT (mA) 15 20
Five LED Efficiency
L 22H VIN 3V ~ 5V CIN 1F VIN 85 D COUT 0.22F
EFFICIENCY(%)
VDC DIMMING SW 90k 5k SHDN GND FB R1 4
80
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
TYPICAL APPLICATION CIRCUIT (cont.)
85 L 22 H C IN 1 F V IN SW 90 k 5k SHDN GND FB R1 4 D 80
EFFICIENCY (%)
LINEAR INTEGRATED CIRCUIT
Seven LED Efficiency
V IN 5V
VDC DIMMING
C OUT 0. 22 F
75
70
5 V to Seven White LEDs
65 0 5 LOAD CURRENT
1 0 (mA )
1 5
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6
QW-R103-024,A
L5100
TYPICAL CHARACTERISTICS
Quiescent Current
2 .2 2 .0 1 .8 350
LINEAR INTEGRATED CIRCUIT
Current Limit vs Duty Cycle
25
300
80
1 .4
IQ (mA) CURRENT LIMIT (mA)
1 .6
250 200 150 100 50 0
1 .2 1 .0 0 .8 0 .6 0 .4 0 .2 0 0 2 4 VIN ( V ) 6 8 10
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
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QW-R103-024,A

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