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| PRELIMINARY S1117 Features 1.0A Adjustable LDO Linear Regulator Symbol adjustable version. Space saving SMD types of SOT-223 and D-Pak(TO-252) 1.1V Drop-out Voltage 1.0A Output Current Current Limiting and Thermal protection Over Current Protection. Ouput trimmed to 2% Tolerance Fast Transient Response General Description The S1117 is a series of low dropout voltage regulators which can provide up to 1A of output current. On chip precision trimming adjusts the refernce/output voltage to within * 2%. Current limit is also trimmed to ensure specified output current and controlled short-circuit current. The S1117 series is available in SOT-223 and DPAK power packages. A minimum of 10uF tantalum capacitor is required at the output to improve the transient response and stability. DPAK SOT-223 Applications Post Regulator for Sitching DC/DC Converter High Efficiency Linear Regulator Battery Chargers PC Add on Card Motherboard clock supplies Absolute Maximum Ratings Parameter Input Voltage Junction Temperature Storage Temperature Symbol VIN(MAX) TJ TSTG Value 18 -25C ~ +125C -55C ~ +150C Units V C C Electrical Characteristics ( Vin = 3.25V, Co = 10uF, Ta = 25C, unless otherwise specified) Parameter Reference Voltage Line Regulation Load Regulation Dropout Voltage 1 Dropout Voltage 2 Quiescent Current Ripple Rejection Symbol Vref dVOUT1 dVOUT2 VDROP1 VDROP2 Iq RR Test Condition VIN = 3.25V, IO = 10mA IOUT=10mA, 3.25V < VIN < 12.25V VIN = 3.25V, 10mA < IOUT < 1A IOUT = 100mA IOUT = 1A V IN < 12V f = 120Hz, COUT = 22uF Tantalum, 4.15V < VIN < 4.35, IOUT = 500mA MIn. 1.225 0 0 55 Typ. 1.250 1.0 1.0 1.00 1.10 5 100 Max. 1.275 2.5 6.0 1.15 1.25 10 200 Units V mV mV V V mA dB Sep 2002. Rev. 0 1/4 S1117 Electrical Characteristics ( Vin = 3.25V, Co = 10uF, Ta = 25C, unless otherwise specified) Parameter Symbol Test Condition Current Limit Adjust Pin Current Minimum Load Current Long Term Stability RMS Output Noise Thermal Shutdown Thermal Shutdown Hysteresis Over Voltage Protection Tsd Thys VOVP ILimit Iadj IMin Stable TA = 125C, 1000hrs 10Hz < f < 10kHz Vin = 3.25V Tj = 130 to 210deg Vin = 3.25V Tj = 210 to 130deg Vin = 10V to 25V Io = 10mA VIN - VOUT = 2V Vin = 3.25V. Io = 10mA MIn. 1 10 10 150 5 14.4 Typ. 1.5 35 0.03 0.003 170 10 16.4 Max. 100 1.0 200 35 18.4 Units A uA mA % % C C V 2/4 S1117 Fig 1. Output current vs. drop out voltage 1.2 Fig 2. Quiescent current vs. drop out voltage 6 1.0 5 Drop out Voltage, VDROP[V] 0.8 4 ICC[mA] 0.6 3 0.4 2 0.2 IO = variable Ta = 250.2 0.4 0.6 0.8 1.0 1 VCC = Variable Vout = 3.3V IO = 9mA 0 5 10 15 20 0.0 0.0 0 Output Current, IO[A] VCC vs Quiescent Current Fig 3. Output current vs. load regulation 16 14 Fig 4. Absolute Maximum safe operating area 1.2 1.0 12 10 8 6 4 2 0 0.0 Output Current [A] Vin = 5.3V IO = variable Ta = 250.2 0.4 0.6 0.8 1.0 0.8 VLOAD[mV] 0.6 0.4 0.2 0.0 0 2 4 6 8 10 12 14 16 18 Output current vs. Load Regulation VIN - VOUT[V] Fig 5. Quiescent current vs. Temperature. 6 4.0 3.8 Fig 6. Output voltage vs. Temperature. 5 3.6 3.4 4 Output voltage 3.2 3.0 2.8 2.6 2.4 2.2 2.0 ICC[mA] 3 2 1 VCC = 5.3V VOUT = 3.3V Temp = Variable IO = 0mA -20 0 20 40 60 80 100 VCC = 5.3V Vout = 3.3V Temperature = Variable IO = 10mA -20 0 20 40 60 80 100 0 Temperature Temperautre 3/4 S1117 Typical Application }pu \} S1117 (3) IN 4 GND (1) OUT(2) } YU\}GGXh 4 XWm YYm XY\ Y\ Vout = (1 + R2/R1) X Vref Example) If R1 = 125ohm, Rd=25ohm, Vout = (1 + 25/125) X 1.25 = 1.5V 4/4 |
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