ary AIC1993 Linear Fan Control Driver IC FEATURES GENERAL DESCRIPTION VOUT Follows 1.6 Times of VSET The AIC1993 is a high performance positive linear voltage regulator designed for applications requiring low dropout voltage at maximum 500mA output current. The AIC1993 VO output voltage follows 1.6 times of VSET voltage until it reaches VIN voltage. The VSET voltage must be larger than 1V to guarantee VOUT as 1.6 times of VSET voltage. An enable pin can be used to reduce power dissipation in shutdown mode. The AIC1993 provides excellent line and load regulation. The AIC1993 is available in SOP-8 package. 150mV Dropout at 500mA Output Current Over Current and Over Temperature Protection Enable Function 5uA Quiescent Current in Shutdown Mode SOP-8 Package APPLICATIONS Notebook PC PC Motherboard Battery Powered Systems Peripheral Cards TYPICAL APPLICATION CIRCUIT Typical Application Circuit Analog Integrations Corporation Si-Soft Research Center DS-1993-P1 050708 3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C. TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1 AIC1993 ORDERING INFORMATION AIC1993XXXXX PIN CONFIGURATION PACKING TYPE TR: TAPE & REEL TB: TUBE PACKAGING TYPE S8: SOP-8 SOP-8 TOP VIEW EN 1 VIN 2 8 GND 7 GND VO 3 6 GND VSET 4 5 GND P: Lead Free Commercial Example: AIC1993PS8TR Lead Free SOP-8 Package & Taping & Reel Packing Type ABSOLUTE MAXIMUM RATINGS VIN, EN, VSET to GND .......................................................................................................-0.3V to +6V Ouput Switch Current ..................................................………………......................................... 500mA Operating Junction Temperature ...........................………………………………….................... 125°C Operating Ambient Temperature Range.......................………………. … …......................... -40~85°C Maximum Storage Temperature Range......................................................................... -65°C to 150°C Maximum Lead Temperature (Soldering 10s) ..............................................................................260°C Thermal Resistance Junction to Case SOP8…..………..………..……………………..………… 40°C/W Thermal Resistance Junction to Ambient SOP8…..………..……………………………………….160°C/W (Assume no ambient airflow) TEST CIRCUIT Refer to Typical Application Circuit. 2 AIC1993 ELECTRICAL CHARACTERISTICS (VIN=5V, VEN=5V, VSET=2V, CIN=COUT=2.2μF, TA= TJ=25°C, Unless otherwise specified.) (Note1) PARAMETER TEST CONDITIONS Operating Voltage SYMBOL MIN. VIN 4.5 TYP. MAX. UNITS 5.5 V Quiescent Current VO = 5V 0.5 Shutdown Supply Current VEN = 0 5 30 μA Output Voltage/VSET Voltage VIN = 5.5V, VSET = 1V to 3.2V 1.6 1.648 V/V Line Regulation VIN = 4.5V to 5.5V 0.2 0.5 % Load Regulation 10mA≦IO ≦500mA 0.5 0.8 % Output Resistance IO = 500mA, VSET = 3.4V 0.2 0.3 Ω 1.552 Short Circuit Current mA 0.3 A Minimum VSET Voltage 1 V VSET Pin Current 80 VEN Voltage High 1.6 VEN = 0 nA V VEN Voltage Low VEN Pin Bias Current 200 1.5 0.4 V 10 μA Thermal-Shutdown Threshold +150 ℃ Thermal-Shutdown Hysteresis 20 ℃ Note 1: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC). 3 AIC1993 TYPICAL PERFORMANCE CHARACTERISTICS VIN=VEN=5V, VSET=2V, IOUT=0.5A, CIN= 4.7μF, COUT=10μF, TA= TJ=25°C Fig.1 Load Transient Response Fig.3 Short Circuit current Fig.5 Quiescent Current vs. Vin Fig.2 Start-UP Fig.4 Overcurrent Protection Characteristics Fig.6 Quiescent Current vs. Temperature 4 AIC1993 Fig.7 Output Voltage vs. Temperature Fig.8 Output Voltage vs. VIN 6 5 VIN=5.5V VOUT(V) 4 3 2 1 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 VSET(V) Fig.9 Dropout Voltage vs. Iout Fig.10 Vout vs. V SET 5 AIC1993 BLOCK DIAGRAM Functional Block Diagram of AIC1993 PIN DESCRIPTIONS Pin 1: VEN: Enable input. Pulling this pin under 0.4V turns the regulator off, reducing the quiescent current to a fraction of its operating value. The device will be enabled if this pin is left open. Connect to VIN if not being used. Pin 2: VIN: Power input pin. Supply the power to the IC. Pin 3: VO: The pin is the power output of the regulator. Its voltage is 1.6 times of VSET. Pin 4: VSET: This pin sets the output voltage. Its voltage must be larger than 1V to guarantee VO as 1.6 times of VSET. Pin 5: GND: Reference ground. Use all four pins on the SOP-8 device. Pin 6: GND: Reference ground. Use all four pins on the SOP-8 device. Pin 7: GND: Reference ground. Use all four pins on the SOP-8 device. Pin 8: GND: Reference ground. Use all four pins on the SOP-8 device. 6 AIC1993 APPLICATION INFORMATIONS INPUT-OUTPUT CAPACITORS Linear regulators require input and output capacitors to maintain stability. Input ceramic capacitor at 2.2µF with a 2.2uF output ceramic capacitor is recommended. EN EN is used to make system enable and disable. It supply to output voltage in shutdown logic mode of fan control. VSET The output voltage control pin has 1.6 Time become the output voltage. Voltage limilt form 0V to 3.125 V like to feedback control resistance in internal R1 and R2 modulation. POWER DISSIPATION The maximum power dissipation of AIC1993 depends on the thermal resistance of its case and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The rate of temperature rise is greatly affected by the mounting pad configuration on the PCB, the board material, and the ambient temperature. When the IC mounting with good thermal conductivity is used, the junc- tion temperature will be low even when large power dissipation applies. The power dissipation across the device is P = IOUT (VIN-VOUT). The maximum power dissipation is: (TJ − TA) PMAX = (RθJB + RθBA) Where TJ-TA is the temperature difference between the die junction and the surrounding air, RθJB is the thermal resistance of the package, and RθBA is the thermal resistance through the PCB, copper traces, and other materials to the surrounding air. As a general rule, the lower temperature is, the better reliability of the device is. So the PCB mounting pad should provide maximum thermal conductivity to maintain low device temperature. GND pin performs a dual function of providing an electrical connection to ground and channeling heat away. Therefore, connecting the GND pin to ground with a large pad or ground plane would increase the power dissipation and reduce the device temperature. 7 AIC1993 PHYSICAL DIMENSIONS (unit: mm) SOP-8 PACKAGE OUTLINE DRAWING h X 45° A H E D A S EE VIEW B A e A1 B 0.25 C WITH P LATING BAS E METAL S ECTIO N A-A G AUGE P LANE S EATING P LANE VIEW B θ L Note : 1. Re fe r to J EDEC MS -012AA. 2. Dime ns ion "D" doe s not include mold fla s h, protrus ions or ga te burrs . Mold fla s h, protrus ion or ga te burrs s ha ll not e xce e d 6 mil pe r s ide . 3. Dime ns ion "E" doe s not include inte r-le a d fla s h or protrus ions . 4. Controlling dime ns ion is millime te r, conve rte d inc h dime ns ions a re not ne ce s s a rily e xa ct. S Y M B O L SOP-8 MILLIMETERS MIN. MAX. A 1.35 1.75 A1 0.10 0.25 B 0.33 0.51 C 0.19 0.25 D 4.80 5.00 E 3.80 4.00 e 1.27 BSC H 5.80 6.20 h 0.25 0.50 L 0.40 1.27 0° 8° θ 8