Pb Free Plating Product ISSUED DATE :2005/04/14 REVISED DATE :2005/10/04B G S S 11 2 0 Dual 1A Low Dropout Positive Regulator Description The GSC1120 series are low dropout positive regulator with minimum of 1A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications such as high speed bus termination and low current 3.3V/2.5V or 3.3V/1.8V logic supply. GSC1120 series and guaranteed to have <1.3V dropout at full load current making it ideal to provide well regulated outputs dual channels with up to 18V input supply. Features Pin Descriptions 1.3Vmaximum dropout at full load current Fast transient response Output current limiting for each channel Built-in thermal shutdown each channel Good noise rejection Dual output A: ch1=3.3V, ch2=2.5V B: ch1=3.3V, ch2=1.8V Applications Name GND 1/2 Function Ground 3.3V (Vout1) The output of the regulator. A minimum of 10 F capacitor 2.5V/1.8V (0.15 ESR 20 ) must be connected from this pin to ground to insure stability. (Vout2) The input pin of regulator. Typical a large storage capacitor (0.15 ESR 20 ) is connected form this pin to ground. Vin 1/2 PC peripheral Communication Package Dimensions REF. A B C D E F Typical Circuit GSS1120 Millimeter Min. Max. 5.80 4.80 3.80 0 0.40 0.19 6.20 5.00 4.00 8 0.90 0.25 REF. M H L J K G Millimeter Min. Max. 0.10 0.25 0.35 0.49 1.35 1.75 0.375 REF. 45 1.27 TYP. Block Diagram Page: 1/3 ISSUED DATE :2005/04/14 REVISED DATE :2005/10/04B Absolute Maximum Ratings Symbol VIN PD TST TOP Parameter Ratings -0.3 to 12 Internally Limited -65 ~ + 150 0 ~ + 150 DC Supply Voltage Power Dissipation Storage Temperature Operating Junction Temperature Range Unit V Electrical Characteristics Parameter Output Voltage Line Regulation Load Regulation Conditions Min Typ Max Unit GSC1120A(B)-VOUT1 Io=10mA, TJ=25 , 4.8V VIN 12V 3.235 3.300 3.365 V GSC1120A-VOUT2 Io=10mA, TJ=25 , 4.0V VIN 12V 2.450 2.500 2.550 V GSC1120B-VOUT2 Io=10mA, TJ=25 , 4.0V VIN 12V 1.764 1.800 1.836 V - - 0.2 % GSC1120-VOUT1 Io=10mA, VOUT+1.5V< VIN <12V, TJ=25 VIN=5V, 0mA<Io<1A, TJ =25 (Note 1,2) - 26 33 mV GSC1120-VOUT2 VIN=4V, 0mA<Io<1A, TJ =25 (Note 1,2) - 20 25 mV - 1.3 1.4 V 1.1 - - A - 5 10 mA Dropout Voltage (VIN-VOUT) Io=1A, VOUT=0.1%VOUT Current Limit VIN-VOUT =5V Minimum Load Current 0 Thermal Regulation TA=25 , 30ms pulse - 0.008 0.04 %/W Ripple Rejection F=120HZ, COUT =25uF Tantalum, IOUT =1A - 60 70 dB Temperature Stability IO=10mA - 0.5 - % JA Thermal Resistance SOP8: Control Circuitry/Power Transistor (Note 4) Junction–to-Ambient(No CH1 or CH2 only heat sink ;No air flow) CH1 & CH2 and PD1=PD2 - 50 45 - /w SOP8: Control Circuitry/Power Transistor (Note 4) Thermal Resistance CH1 or CH2 only Junction-to-Case CH1 & CH2 and PD1=PD2 - 20 12 - /w JC TJ 125 (Note 3) Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead =1/18” from the package. Note 2: Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the input/output differentially and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range. Note 3: Quiescent current is defined as the minimum output current that requires maintaining regulation. At 12V input/output differential the device is guaranteed to regulate if the output current is greater than 10mA. Note 4: Vout1 and Vout2 are connected to the PCB cupper area 5.5mm*5.5mm separately. If you need large PD or lower TC & TJ, please connect to the large cupper area >> 5.5mm*5.5mm (like 10mm*10mm). GSS1120 Page: 2/3 ISSUED DATE :2005/04/14 REVISED DATE :2005/10/04B Typical Performance Characteristics Important Notice: All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of GTM. GTM reserves the right to make changes to its products without notice. GTM semiconductor products are not warranted to be suitable for use in life-support Applications, or systems. GTM assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. Head Office And Factory: Taiwan: No. 17-1 Tatung Rd. Fu Kou Hsin-Chu Industrial Park, Hsin-Chu, Taiwan, R. O. C. TEL : 886-3-597-7061 FAX : 886-3-597-9220, 597-0785 China: (201203) No.255, Jang-Jiang Tsai-Lueng RD. , Pu-Dung-Hsin District, Shang-Hai City, China TEL : 86-21-5895-7671 ~ 4 FAX : 86-21-38950165 GSS1120 Page: 3/3