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UNISONIC TECHNOLOGIES CO., LTD L5030
BOOST-UP VOLTAGE CONVERTER FOR LED DRIVER
DESCRIPTION
The L5030 is a high efficiency boost converter operating in current loop, based on a PFM mode to drive LEDs. The current mode regulation allows the uniform brightness of LEDs. The wide application of L5030 makes it suitable for many types of battery applications such as Li-ions, Alkaline, or Sealed Lead Acid battery. The combination of few external components and small package size keeps the converter board area to a minimum in space-restricted applications.
LINEAR INTEGRATED CIRCUIT
*Pb-free plating product number: L5030L
FEATURES
* Inductor based converter brings up to 92% efficiency * +0.8V to +8.0V input voltage range * 0.92V guaranteed start up input voltage * Boost up control using PFM * Constant output current regulation
ORDERING INFORMATION
Ordering Number Normal Lead Free Plating L5030-AF5-R L5030L-AF5-R Package SOT-25 Packing Tape Reel
www.unisonic.com.tw Copyright (c) 2007 Unisonic Technologies Co., Ltd
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MARKING
3 2 1
LINEAR INTEGRATED CIRCUIT
E0C0
Voltage Code
4
5
PIN DESCRIPTIONS
PIN NO. 1 2 3 4 5 SYMBOL VCC GND NC ISENSE VDRIVE I/O DESCRIPTION Supply voltage Ground No connection Current sense input Output drive for external switching transistor. Connected to the base of external switching transistor.
I O
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www.unisonic.com.tw
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BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
19mV VREF ON/OFF Time Control ISENSE Driver VDRIVE
Q
Oscillator
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www.unisonic.com.tw
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DEVICE DESCRIPTION
LINEAR INTEGRATED CIRCUIT
The UTC L5030 is designed to supply a constant current to the external load, the circuit be powered a battery supply. An external transistor is required for LED application. The UTC L5030 guarantees the start up voltage as low as 0.92V and remains operation down to 0.8V. The basic structure of UTC L5030 is a step-up DC/DC converter. It offers a Pulse Frequency Modulation (PFM) operation, which controls the constant OFF time (1.7s typically) for external transistor at the 200KHz maximum frequency. The external switching transistor is ON and kept on until the voltage across the current-sense resistor which is connected in series with the emitter of the switching transistor exceeds the ISENSE input threshold (19mV). The transistor is shut OFF and the energy stored in inductor is discharged when ISENSE input threshold exceeds 19mV. Once the discharge cycle is completed, the external transistor is ON again. This charging and discharging sequence will repeat and trigger the external transistor regardless the inductor current value.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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ABSOLUTE MAXIMUM RATINGS (Ta = 25 )
LINEAR INTEGRATED CIRCUIT
PARAMETER SYMBOL RATINGS UNIT Supply Voltage VCC -0.3 ~ 10 V Input Voltage -0.3 ~ VCC+0.3 V Power Dissipation PD 450 mW Operating Temperature TOPR -40 ~ +85 C Storage Temperature TSTG -55 ~ +125 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.
ELECTRICAL CHARACTERISTICS (VCC=1.5V)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP DC PARAMETERS (Ta=25C, unless otherwise specified.) Recommended Supply Voltage VCC 0.8 Minimum Startup Voltage VSU(MIN) IDRIVE=-600A, VDRIVE=0.7V 0.8 High VISENSE = 0V, IVDRIVE =-0.5mA VCC-0.3 Drive Voltage VVDRIVE 0 Low VISENSE = 50mV, IVDRIVE = 5mA ISENSE Threshold Voltage VISENSE 14 19 Efficiency(Note 1) 88 Quiescent Current(Note 2) IQ 0.2 VDRIVE Output Current IVDRIVE VDRIVE = 0.7V, VISENSE = 0V 1.5 Supply Current(Note 3) ICC VDRIVE = 0.7V, VISENSE =0V 2 ISENSE Voltage Temp Co.(Note 2) TCVISENSE 0.4 ISENSE Input Current IISENSE VISENSE = 0V 0 -30 AC PARAMETERS(Note 2) (Ta = 0 ~ 70C, unless otherwise specified) Discharge Pulse Width TDRV 1.2 1.7 PFM Operating Frequency (Note 4) FOSC Note 1. The application dependent, please see reference designs. 2. These parameters are guaranteed by design. 3. See typical characteristics. The total supply current =IQ + IVDRIVE, 4. See applications section. Operating frequency is application circuit dependent. MAX UNITS 8 0.92 VCC 0.2 24 92 3.6 4 -65 3.2 200 V V V V mV % mA mA mA %/C A s kHz
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www.unisonic.com.tw
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TYPICAL APPLICATION CIRCUITS
LINEAR INTEGRATED CIRCUIT
The UTC L5030 provides portable and multiple LEDs applications.
Solution for portable application
Solution for multiple LEDs application
Efficiency (%)
Efficiency (%)
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www.unisonic.com.tw
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TYPICAL CHARACTERISTICS
LINEAR INTEGRATED CIRCUIT
Quiescent Current vs. Input Voltage 300 4m
Drive Current vs. Input Voltage
Quiescent Current (A)
200
DriveCurrent (A) 0 1 2 3 4 5 6 Input Voltage (V) 7 8
3m
2m
100
1m
0 1 2 3 4 5 6 Input Voltage (V) 7 8
Sense Voltage (V)
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
Efficiency (%)
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