GS1085 Vishay Siliconix 3A Low Dropout Positive Adjustable Regulator TO-252 (DPak) TO-263AB (D2Pak) TO-220AB 2 3 2 3 1 1 3 2 GS1085CE 1 GS1085CT GS1085CM Pin Definition 1. Adjust/Gnd. 2. Vout (tab) 3. Vin Description The GS1085 is a low dropout three terminal regulator with 3A output current capability. The output voltage is adjustable with the use of a resistor divider. For fixed output voltage versions, the output voltage is internally set at 1.8V, 2.5V, or 3.3V. Dropout is guaranteed at a maximum of 1.3V at maximum output current. Its low dropout voltage and fast transient response make it ideal for low voltage microprocessor applications. Internal current and thermal limiting provides protection against any overload condition that would create excessive junction temperatures. Features * Dropout Voltage 1.3V at 3A Output Current * Fast Transient Response * Line Regulation typically at 0.015% * Load Regulation typically at 0.1% Applications * Internal thermal and current limiting * Adjustable Output Voltage or Fixed 1.8V, 2.5V, 3.3V * Post Regulator for Switching Supply * Standard 3-Pin Power Packages * Microprocessor Power Supplies * Constant-Current Regulators * Motherboard I/O Power Supplies Functional Block Diagram Mechanical Data VIN VREF 1.25V + + GM -- Current Amp High temperature soldering guaranteed: 260C/10 seconds at terminals Thermal Limit 55A Case: TO-220AB, TO-263AB (D2PAK), TO-252 (DPAK) Current Limit Case outlines are on the back page For fixed voltage device ADJ Document Number 74821 07-Mar-05 VOUT GND www.vishay.com 1 GS1085 Vishay Siliconix Maximum Ratings and Thermal Characteristics Parameter Vin Pin to ADJ/GND Pin (TA = 25C unless otherwise noted) Symbol Value Unit Vin 7 V RJC 3.0 8.0 3.0 C/W TJ 0 to +125 C Tstg -65 to 150 C Thermal Resistance - Junction to Case TO-220AB TO-252 TO-263AB Operating Junction Temperature Range Storage Temperature Range Electrical Characteristics (1) Parameter Reference Voltage Output Voltage TJ = 25C (2) , VIN = 5V, Io = 10mA unless otherwise noted. Symbol Test Conditions Min Typ Max Unit VREF TJ = 25C 0C TJ 125C 1.225 1.213 1.250 1.250 1.275 1.288 V 1.76 2.45 3.23 0.98VN 1.8 2.5 3.3 VN 1.84 2.55 3.37 1.02VN V VOUT GS1085-1.8 GS1085-2.5 GS1085-3.3 GS1085 0C TJ VIN = 5V VIN = 5V VIN = 7V 125C Line Regulation REGline 2.75V VIN 7V TJ = 25C 0C TJ 125C 0.015 0.035 0.2 0.2 % VO Load Regulation REGload 10mA Io 3A TJ = 25C 0C TJ 125C 0.1 0.2 0.3 0.4 % VO Dropout Voltage VDROP 0C TJ 125C Io = 3A Io = 2A Io = 1A 1.2 1.1 1.0 1.3 1.2 1.1 Output Current Io 0C TJ 125C 3.0 4.0 - A Iadj 2.75 Vin 7V 10mA Io 3A 0C TJ 125C - 55 120 A Iadj 2.75 Vin 7V 10mA Io 3A 0C TJ 125C - 0.2 5 A TS Io = 0.5A 0C TJ 125C - 0.5 - %VO ILMIN 0C TJ 125C - 5 10 mA Adjust Pin Current Adjust Pin Current Change Temperature Stability Minimum Load Current Adjustable Version www.vishay.com 2 V Document Number 74821 07-Mar-05 GS1085 Vishay Siliconix Electrical Characteristics (con't.)(1) Parameter TJ = 25C (2) , VIN = 5V, Io = 10mA unless otherwise noted. Symbol Test Conditions Min Typ Max Unit Quiescent Current Fixed Voltage Version IQ 0C TJ 125C - 10 14 mA RMS Output Noise N 10HZ f 10 kHZ - 0.003 - %VO Ripple Rejection Ratio RR f = 120 HZ, CO = 25F Cadj = 25F 60 72 - dB Thermal Regulation RTH TA = 25C, 30ms Pulse - 0.02 0.05 %/W TA = 125C, 1000 Hrs - 0.3 - %VO Long Term Stability Notes: (1) All parameters, except nominal output voltage are specified for the variable voltage version, allowing a wider Vin Range. The specified limits also apply for the fixed voltage versions over the allowable input voltage range: GS1085-1.8 (3.2V - 7.0V), GS1085-2.5 (3.9V - 7.0V), GS1085-3.3 (4.75V - 7.0V). (2) To maintain the specified junction temperatures, low duty cycle pulse testing is required for most parameters. Typical Application Circuit VIN 5V C1 10F 3 GS1085-1.8 GS1085-2.5 GS1085-3.3 + 2 1 Fixed Voltage Regulator VOUT VIN 5V 3 GS1085 1 ADJ + C2 10F C1 10F VOUT 3.3V 2 VREF R1 125 1% + + C2 10F R2 205 1% Adjustable Voltage Regulator Notes: VREF = VOUT - VADJ = 1.25V (typ.) VOUT = VREF x (1+R2/R1) + IADJ x R2 IADJ = 55A (typ.) (1) C1 needed if device is far away from filter capacitors (2) C2 required for stability Document Number 74821 07-Mar-05 www.vishay.com 3 GS1085 Vishay Siliconix Ratings and Characteristic Curves (TA = 25C unless otherwise noted) Fig. 1 - Dropout Voltage vs. Output Current Fig. 2 - Load Regulation vs. Temperature 0.10 IOUT = 3A 1.20 Output Voltage Deviation (%) Minimum Differential Voltage (V) 1.22 1.18 1.16 1.14 1.12 1.10 1.08 0.05 0 --0.05 --0.10 --0.15 1.06 --0.20 0.5 0 1.0 1.5 2 2.5 0 3.0 20 40 Fig. 3 - Minimum Load Current (Adjustable Version) 100 120 Fig. 4 - Adjust Pin Current 100 10 Adjust Pin Current (A) 8 TJ = 125C 6 TJ = 25C 4 TJ = 0C 2 0 1 2 3 4 5 80 60 40 20 0 --50 6 --25 0 25 50 75 100 Input / Output Differential Voltage (V) Temperature (C) Fig. 5 - Temperature Stability Fig. 6 - Ripple Rejection (with Cadj 25F) 125 80 1.0 COUT = 25F Iout = 0.5A 0.75 70 Ripple Rejection (dB) Output Voltage Deviation (%) 80 Temperature (C) Output Current (A) Minimum Operating Current (mA) 60 0.5 0.25 0.0 --0.25 --0.5 COUT = 10F 60 COUT = 25F 50 40 30 COUT = 10F --0.75 --1.0 --20 20 0 20 40 60 80 Temperature (C) www.vishay.com 4 100 120 140 10 100 1K 10K 100K 1M Frequency (Hz) Document Number 74821 07-Mar-05 GS1085 Vishay Siliconix Ratings and Characteristic Curves (TA = 25C unless otherwise noted) Fig. 8 - Line Transient Response Fig. 7 - Load Transient Response Output Voltage (mV, AC) 0.05 0 VIN = 5V CIN = 1F COUT = 10F (Tantalum) VOUT = 3.3V --0.05 --0.1 Input Voltage (V) Load Current Output Voltage (V, AC) 0.1 2.5A 0.1A 0 40 80 120 160 50 0 --50 COUT = 10F (Tantalum) VOUT = 3.3V --100 7.0 6.0 0 200 10 20 30 40 50 Time (s) Time (s) Ordering Information PART NUMBER OUTPUT VOLTAGE (V) GS1085CE/27F-E3 1.8 GS1085CE-25/27F-E3 2.5 GS1085CM/31F-E3 TO-252AB Tape/Reel 2500/Reel 3.3 1.8 GS1085CM-25/31F-E3 2.5 GS1085CT/45F-E3 AMBIENT TEMP RANGE Adjustable GS1085CM-18/31F-E3 GS1085CM-33/31F-E3 PACKING Adjustable GS1085CE-18/27F-E3 GS1085CE-33/27F-E3 PACKAGE TO-263AB Tape/Reel 800/Reel - 20C to + 85C 3.3 Adjustable GS1085CT-18/45F-E3 1.8 GS1085CT-25/45F-E3 2.5 GS1085CT-33/45F-E3 3.3 TO-220AB Tube 50/Tube * E3 designates Lead (Pb)-free product Document Number 74821 07-Mar-05 www.vishay.com 5 GS1085 Vishay Siliconix Case Outlines TO-220 TO-252 (DPAK) 6.73 6.35 10.66 9.66 2.38 2.19 3.42 2.54 0.58 0.46 5.46 5.21 4.82 3.56 4.08 3.54 1.39 0.51 6.85 5.85 16.51 14.23 5.59 5.33 2 1 10.42 9.40 3 6.35 Max. 0.88 0.64 0.51 (min.) 14.73 12.70 2.28 (TYP.) 1.27 1.02 2.79 2.29 TO-263 10.29 4.83 9.65 4.06 1.40 1.14 1.77 1.15 1.01 (with plating) 0.38 (with plating) 1.14 0.31 2.92 2.04 Dimensions in millimeters 1.40 (max.) 9.66 8.63 15.88 1 2 3 14.60 1.40 2.80 1.14 2.28 0.7 (max.) 1.00 0.50 2.54 (TYP.) www.vishay.com 6 Document Number 74821 07-Mar-05