UNISONIC TECHNOLOGIES CO., LTD LR18115 LINEAR INTEGRATED CIRCUIT 1.6X LINEAR FAN DRIVER WITH VOUT FULLY ON CONTROL DESCRIPTION The UTC LR18115 is a low output resistance 1.6X positive voltage linear fan driver with very low dropout voltage at up to 500mA. The UTC LR18115 consists of an error amplifier, output stage, voltage divider, over temperature protection, current limiting scheme and Fully Control logic. VOUT voltage follows the 1.6 times of VSET voltage until it reaches VIN voltage. The VSET voltage must be larger than 1V to guarantee VOUT 1.6 times of VSET. When given low, VOUT can be fully turned on by FON pin. Good regulation over variation in line, load and temperature is also provided by UTC LR18115. FEATURES * VOUT Follows 1.6 Times of VSET * 0.3Ω Output Resistance @ 0.5A * Over Temperature Protection * Current Limiting Protection * FON Pin to Turn VOUT Fully On ORDERING INFORMATION Ordering Number LR18115G-S08-R Package SOP-8 Packing Tape Reel MARKING www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 5 QW-R102-039.F LR18115 LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION FON 1 8 GND VIN 2 7 GND VOUT 3 6 GND VSET 4 5 GND PIN DESCRIPTION PIN NO. NAME 1 FON FON Input. Pulling the regulator fully on when this pin below 0.4V. Internally pulled high. 2 3 VIN VOUT 4 VSET 5~8 GND Supply Input. This pin is output voltage of regulator. Its voltage is 1.6 times of VSET. This pin sets output voltage. Its voltage must be larger than 1V to guarantee VOUT 1.6 times of VSET. Common Ground. Use all four pins on SOP-8 device for heat sinking. DESCRIPTION BLOCK DIAGRAM VIN FON VOUT FULLY ON LOGIC THERMAL SHUTDOWN CURRENT LIMIT VSET VOUT R1 R2 R1=0.6xR2 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw GND 2 of 5 QW-R102-039.E LR18115 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (TA＝25°C, unless otherwise specified ) PARAMETER Supply Input Voltage SYMBOL VIN VFON FON Input Voltage RATINGS -0.3 ~ +7 UNIT V 0~7 V Power Dissipation PD Internally Limited Junction Temperature TJ +150 °C Operation Temperature TOPR -40~+85 °C Storage Temperature TSTG -65~+150 °C Note: 1. 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. THERMAL RESISTANCES CHARACTERISTICS PARAMETER Junction to Ambient Junction to Case SYMBOL θJA θJC UNIT °С/W °С/W RECOMMENDED OPERATING CONDITIONS PARAMETER Supply Voltage Operating Temperature RATING 156 39 SYMBOL VCC TA MIN 4.5 -40 TYP MAX 6 85 UNITS V °C ELECTRICAL CHARACTERISTICS (VSET=2V, VIN=5V, IOUT＝0.5A, CIN＝2.2μF, COUT＝2.2μF, TA＝TJ＝25°C, unless otherwise specified )(Note) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT VIN Supply Voltage VCC 4.5 6 V Quiescent Current IQ 3 mA 1.6 1.648 V/V VIN＝4.5V to 6V 0.2 0.5 % 10mA≤IOUT≤0.5A 0.2 0.8 % IOUT＝0.5A, VSET＝3.4V VOUT=0V 0.2 1 0.3 Ω A FON =0V ，VOUT＝5V VOUT Output Voltage/VSET Voltage Line Regulation Load Regulation Output Resistance Current Limit VSET Minimum VSET Voltage VSETpin Current VOUT VSET ∆VOUT VOUT ∆VOUT VOUT ROUT ILIMLT VIN=6V,VSET=1V~3.3V 1.552 VSET(MIN) ISET 1 80 200 V nA 0.4 V V 10 μA FON FON Voltage VFON FON pin Bias Current IFON High Low FON =0V 1.6 1.5 OVER TEMPERATURE PROTECTION Over Temperature Shutdown OTS 150 °C Over Temperature Hysteresis OTH 25 °C Note: Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 5 QW-R102-039.E LR18115 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT LR18115 VSET VSET FON FON VIN VIN VOUT VOUT GND CIN 2.2µF COUT 2.2µF Fan VOUT=1.6×VSET UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 5 QW-R102-039.E LR18115 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS 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 5 of 5 QW-R102-039.E