SPX2945 400mA Low Dropout Voltage Regulator with Shutdown FEATURES 1.2V to 20V 1 8 +V +V V IN IN OUT Output 3.3V, 5.0V at 400mA Output + 100K 0.01F 10F R 1 7 Very Low Quiescent Current, 100A SPX2945 FB SHUTDOWN ERROR Low Dropout Voltage, 420mV at 400mA INPUT SD ERROR 3 5 GND OUTPUT V REF Extremely Tight Load and Line Regulation OFF 4 R 2 ON Very Low Temperature Coefficient Current & Thermal Limiting Adjustable Regulator Error Flag Warns Of Output Dropout 5V V IN IN OUT Logic-Controlled Electronic Shutdown SPX2945 Output Programmable From 1.24V to 20V (for SO-8) + + 2.2 F GND 0.1 F 5V Regulator Circuit Now Available in Lead Free Packaging DESCRIPTION The SPX2945 is a low power voltage regulator. This device is an excellent choice for use in battery-powered applications such as cordless telephones, radio control systems, and portable computers. The SPX2945 features very low quiescent current (100A Typ.) and very low dropout voltage. This includes a tight initial tolerance of 1% max and very low output temperature coefficient, making the SPX2945 useful as a low- power voltage reference. The error flag output feature is used as power-on reset for warning of a low output voltage, due to a falling voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. The SPX2945 is offered in 3-pin TO-220 package, SO-8 (same pin out as SPX2951), SOT-223, surface mount 3-Pin TO-252, 3-Pin TO-263 packages and 5-Pin TO-263. The regulator output voltage (of the 8-pin SO-8) may be pin-strapped for a 3.3V and 5.0V or programmed from 1.24V to 20V with an external pair of resistors. Look for SPX2951 for 150mA and SPX2954 for 250mA applications. TO-252 (R) TO-220-3 (U) TO-263-3 (T) TO-263-5 (T5) 8-Pin Surface Mount(S) SOT-223 (M3) V OU 1 8 V IN SPX2945 SPX2945 SPX2945 SPX2945 SPX2945 2 7 SENS FEEDBACK SPX2945 132 5 Pin TO-263 1 23 1 3 2 SHUTDOWN 3 6 5V/ 3.3V TAP 123 13254 V V IN GN OU GN 4 5 ERRO V GN V IN OU V GN V IN OU V GN V IN OU Note: Tab is Ground Date: 3/14/06 SPX2945 400mA Low Dropout Voltage Regulator with Shutdown Copyright 2006 Sipex Corporation 1 Er V IN GND V OUT SD ABSOLUTE MAXIMUM RATINGS Feedback Input Voltage ................................................ -1.5V to +26V Power Dissipation ........................................................ Internally Limited Lead Temp. (Soldering, 5 Seconds) ............................................. 260C Shutdown Input Voltage ................................................ -0.3V to +26V Error Comparator Output .............................................. -0.3V to +26V Storage Temperature Range ........................................ -65C to +150C ESD Rating ............................................................................ 2kV Min Operating Junction Temperature Range ....................... -40C to +125C Input Supply Voltage ......................................................... -20V to +26V ELECTRICAL CHARACTERISTICS Electrical characteristics at V = V +1V, I = 1mA, C = 2.2F, T = 25C, unless otherwise specified. The denotes IN O O OUT A the specifications wich apply over full operating tempeture range -40C to +85C, unless noted. PARAMETER CONDITIONS MIN TYP MAX UNITS (Note 2) 3.3V Version Output Voltage 3.267 3.3 3.333 V 1mA I 400mA 3.217 3.3 3.382 L 5.0V Version Output Voltage 4.950 5.0 5.050 V 1mA I 400mA 4.880 5.0 5.120 L All Voltage Options Output Voltage 20 100 ppm/C Temperature Coefficient (Note1) Line Regulation (Note 3) 6V V 20V (Note 4) 1.5 20 mV IN Load Regulation (Note 3) I =1 to 400mA 6 20 mV L 30 Dropout Voltage (Note5) I =1mA 60 100 mV L 150 I =400mA 360 450 L 700 Ground Current I =1mA 100 200 A L 300 I =150mA 2 4 mA L 6 I =300mA 4 8 L 12 I =400mA 8 15 L 25 Current Limit V =0 330 800 mA OUT Thermal Regulation 0.05 0.2 %/W Output Noise, 10Hz to 100kHz, C =2.2F 400 V L RMS I =100mA C =33F 260 L L PSRR at 100KHz 31 dB I =100mA C =10F L L Adjustable 8 Pin Version only Reference Voltage 1.210 1.235 1.260 V Reference Voltage Over Temperature 1.185 1.285 V Feedback Pin Bias Current 20 40 nA 60 Reference Voltage Temp. 20 ppm/C Coefficient Date: 3/14/06 SPX2945 400mA Low Dropout Voltage Regulator with Shutdown Copyright 2006 Sipex Corporation 2