SCJT1117B-3.3

JIANGSU CHANGJING ELECTRONICS TECHNOLOGY CO., LTD 1A LOW DROPOUT LINEAR REGULATOR SCJT1117B Series FEATURES z z z z z SOT-223 Low Dropout Voltage: 1.3V(typ.) at 1A Output Current Thermal Shutdown Three-Terminal Adjustable to 1.2V,1.5V,1.8V, 2.5V, 3.3V, 5V Operation Junction Temperature: -40°C to 125°C Space-saving SOT-223 packages 1. ADJ/GND 2. OUTPUT 3.IN GENERAL DESCRIPTION The SCJT1117B series is a group of low dropout three-terminal regulators with a dropout of 1.3V(typ.) at 1A output current. The SCJT1117B series is available in an adjustable version, which can set the output voltage from 1.25V to 12 V with only two external resistors. In addition, it is available in five fixed voltages: 1.2V, 1.5V, 1.8 V, 2.5 V, 3.3 V and 5 V. The SCJT1117B series offer thermal shutdown protection. Its circuit includes a Zener trimmed bandgap reference to assure output voltage accuracy to within ±2%. A minimum of 10µF tantalum capacitor is required at the output to improve the transient response and stability. APPLICATIONS z z z z z z z z PC Motherboard LCD Monitor Graphic Card DVD-Video Player NIC/Switch Telecom Modem ADSL Modem Printer and Other Peripheral Equipment MARKING CJT1117B = Device code CJT1117B XXX Lot No. www.jscj-elec.com XXX: output voltage 1 Rev - 1.9 MAXIMUM RATINGS ORDERING INFORMATION Package Operating Junction Temperature Range Part NO. SCJT1117B-ADJ SCJT1117B-1.2 SOT-223 SCJT1117B-1.5 -40 to 125℃ SCJT1117B-1.8 SCJT1117B-2.5 SCJT1117B-3.3 SCJT1117B-5.0 ABOSLUTE MAXIMUM RATINGS (TA=25℃ unless otherwise noted) Parameter Symbol Value Unit Vi 20 V RθJA 100 ℃/W Operating Ambient Temperature TA -40~+85 ℃ Maximum Junction Temperature Tj -40~+150 ℃ Storage Temperature Tstg -40~+150 ℃ Lead Temperature (Soldering, 10s) TL 260 ℃ Human Body Model, HBM 2.5 kV Input Voltage Thermal Resistance from Junction to Ambient ESD Rating Note: Stresses greater than those listed under ”Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. RECOMMENDED OPERATING CONDITIONS Parameter Symbol Value Unit Input Voltage Vi 15 V Operating Junction Temperature Tj -40~+125 ℃ www.jscj-elec.com 2 Rev - 1.9 ELECTRICAL CHARACTERISTICS V IN≤10V, TJ=25℃ unless otherwise specified. Parameter Reference Voltage Symbol VIROC Part NO. SCJT1117B-ADJ SCJT1117B-1.2 SCJT1117B-1.5 SCJT1117B-1.8 Output Voltage VO SCJT1117B-2.5 SCJT1117B-3.3 SCJT1117B-5.0 Line Regulation Load Regulation LNR LDR 1.275 10mA≤IOUT≤1A, 2.75V≤VIN -VOUT ≤12V 1.219 1.25 1.281 IOUT=10mA, VIN=3.2V 1.176 1.2 1.224 10mA≤IOUT≤1A, 2.7V≤VIN ≤12V 1.170 1.2 1.230 IOUT=10mA, VIN=3.5V 1.470 1.5 1.530 10mA≤IOUT≤1A, 3V≤VIN ≤12V 1.463 1.5 1.537 IOUT=10mA, VIN=3.8V 1.764 1.8 1.836 10mA≤IOUT≤1A, 3.3V≤VIN ≤12V 1.755 1.8 1.845 IOUT=10mA, VIN=4.5V 2.450 2.5 2.550 10mA≤IOUT≤1A, 4V≤VIN ≤12V 2.438 2.5 2.562 IOUT=10mA, VIN=5.3V 3.234 3.3 3.366 10mA≤IOUT≤1A, 4.8V≤VIN ≤12V 3.218 3.3 3.382 IOUT=10mA, VIN=7.0V 4.900 5.0 5.100 10mA≤IOUT≤1A, 6.5V≤VIN ≤12V 4.875 5.0 5.125 V V 0.2 SCJT1117B-1.5 IOUT=10mA, 1.5V≤VIN -VOUT ≤8.5V 0.03 0.2 SCJT1117B-1.8 IOUT=10mA, 1.5V ≤VIN -VOUT ≤10.2V 0.03 0.2 SCJT1117B-2.5 IOUT=10mA, 1.5V ≤VIN -VOUT ≤9.5V 0.03 0.2 SCJT1117B-3.3 IOUT =10mA, 1.5V≤VIN -VOUT ≤8.7V 0.03 0.2 SCJT1117B-5.0 IOUT=10mA, 1.5V ≤VIN -VOUT ≤7V 0.03 0.2 SCJT1117B-ADJ 2 8 SCJT1117B-1.2 2 8 SCJT1117B-1.5 2 8 3 12 SCJT1117B-2.5 4 16 SCJT1117B-3.3 6 24 SCJT1117B-5.0 9 36 IOUT=1A 1.3 1.5 V VIN= 5V, IOUT=10mA 55 120 μA VIN= 5V, IOUT=1A 55 120 μA VIN= 5V 10mA≤IOUT≤1A 0.2 10 μA 2 10 mA SCJT1117B-1.8 IL SCJT1117B-ADJ www.jscj-elec.com 1.25 0.03 SCJT1117B-ADJ RR 1.225 IOUT=10mA, 1.5V≤VIN -VOUT ≤8.8V Ichange Ripple Rejection IOUT=10mA, VIN =3.25V Unit SCJT1117B-1.2 SCJT1117B-ADJ Iq Max 0.2 IAdj Quiescent Current Typ 0.03 Adjust Pin Current Load Current Min IOUT=10mA, 1.5V≤VIN -VOUT ≤10.75V VD Minimum conditions SCJT1117B-ADJ Dropout Voltage IAdj change Test VIN-VOUT=1.5V, 10mA≤IOUT ≤1A % %/V mV mV SCJT1117B-1.2 VIN= 10V 2 5 mA SCJT1117B-1.5 VIN= 10V 2 5 mA SCJT1117B-1.8 VIN= 12V 2 5 mA SCJT1117B-2.5 VIN= 12V 2 5 mA SCJT1117B-3.3 VIN= 12V 2 5 mA SCJT1117B-5.0 VIN= 12V 2 5 mA f=120Hz,COUT=22μF Tantalum, VIN-VOUT=3V, IOUT=1A 3 60 dB Rev - 1.9 FUNCTIONAL BLOCK and TYPICAL APPLICATION FUNCTIONAL BLOCK DIAGRAM DETAILED DESCRIPTION SCJT1117B-XXX is a series of low dropout voltage, three terminal regulators. Its application circuit is very simple: the fixed version only needs two capacitors and the adjustable version only needs two resistors and two capacitors to work. It is composed of some modules including start-up circuit, bias circuit, bandgap, thermal shutdown, power transistors and its driver circuit and so on. The thermal shut down modules can assure chip and its application system working safety when the junction temperature is larger than 140°C. The bandgap module provides stable reference voltage, whose temperature coefficient is compensated by careful design considerations. The temperature coefficient is under 100 ppm/°C. And the accuracy of output voltage is guaranteed by trimming technique. TYPICAL APPLICATION Fixed Output Voltage Version SCJT1117B-XXX VIN C1=10μF IN OUT GND VOUT C2=10μF 1) Recommend using 10uF tan capacitor as bypass capacitor (C1) for all application circuit. 2) Recommend using 10uF tan capacitor to assure circuit stability. www.jscj-elec.com 4 Rev - 1.9 TYPICAL APPLICATION Adjustable Output Voltage Version SCJT1117B-ADJ IN VIN ADJ C1=10μF VOUT OUT VREF R1 C2=10μF IADJ R2 VOUT = VREF× (1+ R2/R1)+IADJ×R2 The output voltage of adjustable version follows the equation: Vout= 1.25×(1+R2/R1)+IAdj×R2. We can ignore IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA). 1) To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower. As SCJT1117B-ADJ can keep itself stable at load current about 2mA, R1 is not allowed to be higher than 625ohm. 2) Using a bypass capacitor (CADJ) between the ADJ pin and ground can improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. The impedance of CADJ should be less than R1 to prevent ripple from being amplified. As R1 is normally in the range of 100Ω~500Ω, the value of CADJ should satisfy this equation: 1/(2π×fripple×CADJ)