L5030

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 © 2007 Unisonic Technologies Co., Ltd 1 of 7 QW-R125-001.B L5030 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 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 7 QW-R125-001.B L5030 BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT 19mV VREF + ISENSE S R Q ON/OFF Time Control Driver VDRIVE - Oscillator UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 7 QW-R125-001.B L5030 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 (1.7µs 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 4 of 7 QW-R125-001.B L5030 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=25°C, unless otherwise specified.) Recommended Supply Voltage VCC 0.8 Minimum Startup Voltage VSU(MIN) IDRIVE=-600µA, 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) η 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 ~ 70°C, 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 µA µs kHz UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 7 QW-R125-001.B L5030 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 (%) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 7 QW-R125-001.B L5030 TYPICAL CHARACTERISTICS LINEAR INTEGRATED CIRCUIT Quiescent Current vs. Input Voltage 300μ 4m Drive Current vs. Input Voltage Quiescent Current (A) 200μ DriveCurrent (A) 1 2 3 4 5 6 Input Voltage (V) 7 8 3m 2m 100μ 1m 0 0 1 2 3 4 5 6 Input Voltage (V) 7 8 Sense Voltage (V) U TC 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 (%) 7 of 7 QW-R125-001.B