PRELIMINARY S1117 1.0A Adjustable LDO Linear Regulator Features 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 Symbol 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 Symbol Input Voltage VIN(MAX) Value Units 18 V Junction Temperature TJ -25°C ~ +125°C °C Storage Temperature TSTG -55°C ~ +150°C °C Electrical Characteristics ( Vin = 3.25V, Co = 10uF, Ta = 25°C, unless otherwise specified) Parameter Symbol Test Condition MIn. Typ. Max. Units Reference Voltage Vref VIN = 3.25V, IO = 10mA 1.225 1.250 1.275 V Line Regulation dVOUT1 IOUT=10mA, 3.25V < VIN < 12.25V 0 1.0 2.5 mV Load Regulation dVOUT2 VIN = 3.25V, 10mA < IOUT < 1A 0 1.0 6.0 mV Dropout Voltage 1 VDROP1 IOUT = 100mA - 1.00 1.15 V Dropout Voltage 2 VDROP2 IOUT = 1A - 1.10 1.25 V Quiescent Current Iq V IN < 12V - 5 10 mA 55 100 200 dB Ripple Rejection Sep 2002. Rev. 0 RR f = 120Hz, COUT = 22uF Tantalum, 4.15V < VIN < 4.35, IOUT = 500mA 1/4 S1117 Electrical Characteristics ( Vin = 3.25V, Co = 10uF, Ta = 25°C, unless otherwise specified) Parameter Symbol Test Condition Current Limit ILimit Adjust Pin Current Iadj Minimum Load Current IMin Long Term Stability Stable RMS Output Noise Thermal Shutdown Tsd Thermal Shutdown Hysteresis Thys Over Voltage Protection VOVP 2/4 MIn. Typ. VIN - VOUT = 2V 1 1.5 - A Vin = 3.25V. Io = 10mA 10 35 100 uA 10 - - mA TA = 125°C, 1000hrs - 0.03 1.0 % 10Hz < f < 10kHz - 0.003 - % 150 170 200 °C 5 10 35 °C 14.4 16.4 18.4 V Vin = 3.25V Tj = 130 to 210deg Vin = 3.25V Tj = 210 to 130deg Vin = 10V to 25V Io = 10mA Max. Units S1117 Fig 2. Quiescent current vs. drop out voltage 1.2 6 1.0 5 0.8 4 ICC[mA] Drop out Voltage, VDROP[V] Fig 1. Output current vs. drop out voltage 0.6 3 2 0.4 0.2 VCC = Variable Vout = 3.3V IO = 9mA 1 IO = variable Ta = 25- 0 0.0 0.0 0.2 0.4 0.6 0.8 0 1.0 5 10 15 20 Output Current, IO[A] VCC vs Quiescent Current Fig 3. Output current vs. load regulation Fig 4. Absolute Maximum safe operating area 16 1.2 14 1.0 Output Current [A] 12 VLOAD[mV] 10 8 6 4 Vin = 5.3V IO = variable Ta = 25- 2 0 0.0 0.2 0.4 0.6 0.8 0.8 0.6 0.4 0.2 0.0 1.0 0 Output current vs. Load Regulation 2 4 6 8 10 12 14 16 18 VIN - VOUT[V] Fig 6. Output voltage vs. Temperature. Fig 5. Quiescent current vs. Temperature. 6 4.0 3.8 5 3.6 3.4 3 2 VCC = 5.3V VOUT = 3.3V Temp = Variable IO = 0mA 1 0 Output voltage ICC[mA] 4 3.2 3.0 2.8 2.6 VCC = 5.3V Vout = 3.3V Temperature = Variable IO = 10mA 2.4 2.2 2.0 -20 0 20 40 Temperature 60 80 100 -20 0 20 40 60 80 100 Temperautre 3/4 S1117 Typical Application S1117 XWm (3) IN 4 OUT(2) 4 GND (1) Vout = (1 + R2/R1) X Vref Example) If R1 = 125ohm, Rd=25ohm, Vout = (1 + 25/125) X 1.25 = 1.5V 4/4