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| GS1085 New Product Vishay formerly General Semiconductor 3A Low Dropout Positive Adjustable Regulator TO-252 (DPak) TO-220AB TO-263AB (D2Pak) 2 1 3 2 1 3 2 1 3 GS1085CE 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 1.4V 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% * Internal thermal and current limiting * Adjustable Output Voltage or Fixed 1.8V, 2.5V, 3.3V * Standard 3-Pin Power Packages Applications * Post Regulator for Switching Supply * Microprocessor Power Supplies * Constant-Current Regulators * Motherboard I/O Power Supplies Functional Block Diagram Mechanical Data VIN Current Amp Case: TO-220AB, TO-263AB (D2PAK), TO-252 (DPAK) High temperature soldering guaranteed: 260C/10 seconds at terminals VREF 1.25V 55A + + GM -- Thermal Limit Current Limit VOUT Case outlines are on the back page For fixed voltage device ADJ GND Document Number 74821 24-May-02 www.vishay.com 1 GS1085 Vishay formerly General Semiconductor Maximum Ratings and Thermal Characteristics Parameter Vin Pin to ADJ/GND Pin Thermal Resistance - Junction to Case TO-220AB TO-252 TO-263AB Operating Junction Temperature Range Storage Temperature Range (TA = 25C unless otherwise noted) Symbol Vin Value 7 3.0 8.0 3.0 0 to +125 -65 to 150 Unit V RJC TJ Tstg C/W C C Electrical Characteristics (1) Parameter TJ = 25C (2) , VIN = 5V, Io = 10mA unless otherwise noted. Symbol Test Conditions TJ = 25C 0C TJ 125C 2.65V VIN 7V 10mA Io 3A GS1085-1.8 VIN = 5V GS1085-2.5 VIN = 5V GS1085-3.3 VIN = 7V GS1085 0C TJ 125C 2.65V VIN 5V 10mA Io 3A 2.65V VIN 7V TJ = 25C 0C TJ 125C 10mA Io 3A TJ = 25C 0C TJ 125C 0C TJ 125C Io = 3A Io = 2A Io = 1A 0C TJ 125C 2.65 Vin 7V 10mA Io 3A 0C TJ 125C 2.65 Vin 7V 10mA Io 3A 0C TJ 125C Io = 0.5A 0C TJ 125C 0C TJ 125C Min 1.238 1.225 Typ 1.250 1.250 Max 1.262 1.275 Unit Reference Voltage VREF V Output Voltage VOUT 1.78 2.47 3.26 0.98VN 1.8 2.5 3.3 VN 1.82 2.53 3.33 1.02VN V Line Regulation REGline 0.015 0.035 0.1 0.2 1.3 1.28 1.25 3.0 - 4.0 55 0.2 0.2 0.3 0.4 1.4 1.37 1.34 - 120 % VO Load Regulation REGload % VO Dropout Voltage VDROP V Output Current Adjust Pin Current Io Iadj A A Adjust Pin Current Change Iadj - 0.2 5 A Temperature Stability Minimum Load Current Adjustable Version TS ILMIN - - 0.5 5 - 10 %VO mA www.vishay.com 2 Document Number 74821 24-May-02 GS1085 Vishay formerly General Semiconductor Electrical Characteristics(con't.)(1) Parameter Quiescent Current Fixed Voltage Version RMS Output Noise Ripple Rejection Ratio Thermal Regulation Long Term Stability IQ N RR RTH TJ = 25C (2) , VIN = 5V, Io = 10mA unless otherwise noted. Symbol Test Conditions 0C TJ 125C 10HZ f 10 kHZ f = 120 HZ, CO = 25F Cadj = 25F TA = 25C, 30ms Pulse TA = 125C, 1000 Hrs Min - - 60 - - Typ 10 0.003 68 0.02 0.3 Max 14 - - 0.05 - Unit mA %VO dB %/W %VO 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 3 GS1085-1.8 GS1085-2.5 GS1085-3.3 1 2 VOUT VIN 5V 3 GS1085 1 ADJ 2 R1 125 1% R2 205 1% VOUT 3.3V VREF C1 10F + + C2 10F C1 10F + + C2 10F Fixed Voltage Regulator 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 24-May-02 www.vishay.com 3 GS1085 Vishay formerly General Semiconductor Ratings and Characteristic Curves (TA = 25C unless otherwise noted) Fig. 1 - Dropout Voltage vs. Output Current 1.22 0.10 IOUT = 3A Fig. 2 - Load Regulation vs. Temperature Minimum Differential Voltage (V) 1.20 Output Voltage Deviation (%) 0.05 0 --0.05 --0.10 1.18 1.16 1.14 1.12 1.10 1.08 1.06 --0.15 --0.20 0 0.5 1.0 1.5 2 2.5 3.0 0 20 40 60 80 100 120 Output Current (A) Temperature (C) Fig. 3 - Minimum Load Current (Adjustable Version) 10 100 Fig. 4 - Adjust Pin Current Minimum Operating Current (mA) TJ = 125C 6 TJ = 25C 4 TJ = 0C Adjust Pin Current (A) 8 80 60 40 2 20 0 1 2 3 4 5 6 0 --50 --25 0 25 50 75 100 125 Input / Output Differential Voltage (V) Temperature (C) Fig. 5 - Temperature Stability 1.0 Iout = 0.5A 0.75 80 70 Fig. 6 - Ripple Rejection (with Cadj 25F) COUT = 25F Output Voltage Deviation (%) 0.5 0.25 0.0 --0.25 --0.5 --0.75 --1.0 --20 Ripple Rejection (dB) COUT = 10F 60 50 40 30 COUT = 10F 20 COUT = 25F 0 20 40 60 80 100 120 140 10 100 1K 10K 100K 1M Temperature (C) www.vishay.com 4 Frequency (Hz) Document Number 74821 24-May-02 GS1085 Vishay formerly General Semiconductor Ratings and Characteristic Curves (TA = 25C unless otherwise noted) Fig. 7 - Load Transient Response 0.1 Fig. 8 - Line Transient Response Output Voltage (mV, AC) 50 0 --50 --100 COUT = 10F (Tantalum) VOUT = 3.3V Output Voltage (V, AC) 0.05 0 --0.05 --0.1 VIN = 5V CIN = 1F COUT = 10F (Tantalum) VOUT = 3.3V Load Current Input Voltage (V) 1.5A 0.1A 7.0 6.0 0 40 80 120 160 200 0 10 20 30 40 50 Time (s) Time (s) Ordering Information GS1085Cxx xxx Output Voltage Default: Adj. 1.8: 1.8V 2.5: 2.5V 3.3: 3.3V Package Type T: TO-220 M: TO-263 E: TO-252 Document Number 74821 24-May-02 www.vishay.com 5 GS1085 Vishay formerly General Semiconductor Case Outlines TO-252 (DPAK) 10.66 9.66 TO-220 4.08 3.54 4.82 3.56 1.39 0.51 6.73 6.35 5.46 5.21 2.38 2.19 0.58 0.46 3.42 2.54 6.85 5.85 16.51 14.23 5.59 5.33 10.42 9.40 1 2 3 0.88 0.64 2.28 (TYP.) 1.27 1.02 6.35 Max. 0.51 (min.) 14.73 12.70 TO-263 10.29 9.65 4.83 4.06 1.40 1.14 2.79 2.29 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 1.14 1.00 0.50 2.54 (TYP.) 2.80 2.28 0.7 (max.) www.vishay.com 6 Document Number 74821 24-May-02 |
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