LT1970 500mA Power Op Amp with Adjustable Precision Current Limit Fea T Descrip T n 500mA Minimum Output Current The LT 1970 is a 500mA power op amp with precise n Independent Adjustment of Source and externally controlled current limiting. Separate control Sink Current Limits voltages program the sourcing and sinking current limit n 2% Current Limit Accuracy sense thresholds with 2% accuracy. Output current may n Operates with Single or Split Supplies be boosted by adding external power transistors. n Shutdown/Enable Control Input The circuit operates with single or split power supplies n Open Collector Status Flags: from 5V to 36V total supply voltage. In normal operation, Sink Current Limit the input stage supplies and the output stage supplies are Source Current Limit + connected (V to V and V to V ). To reduce power CC EE Thermal Shutdown + dissipation it is possible to power the output stage (V , n Fail Safe Current Limit and Thermal Shutdown V ) from independent, lower voltage rails. The amplifier is n 1.6V/s Slew Rate unity-gain stable with a 3.6MHz gain bandwidth product n 3.6MHz Gain Bandwidth Product and slews at 1.6V/s. The current limit circuits operate n Fast Current Limit Response: 2MHz Bandwidth with a 2MHz response between the VC or VC control SRC SNK n Specified Temperature Range: 40C to 85C inputs and the amplifier output. n Available in a 20-Lead TSSOP Package Open collector status flags signal current limit circuit activation, as well as thermal shutdown of the amplifier. a T An enable logic input puts the amplifier into a low power, n high impedance output state when pulled low. Thermal Automatic Test Equipment n shutdown and a 800mA fixed current limit protect the Laboratory Power Supplies n chip under fault conditions. Motor Drivers n Thermoelectric Cooler Driver The LT1970 is packaged in a 20-lead TSSOP package with L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear a thermally conductive copper bottom plate to facilitate Technology Corporation. All other trademarks are the property of their respective owners. heat sinking. Typical a T A = 2 Amplifier with Adjustable 500mA Full-Scale Current Limited Sinewave Into 10 Load V Current Limit and Fault Indication V LIMIT 0V TO 5V 15V 15V 4V V 3k LIMIT I = OUT(LIMIT) V CC 10 R 2V CS + V EN 0V V LOAD VC SRC V +IN IN VC SNK 2V R CS ISNK 1 I ISRC OUT 1/4W TSD LT1970 OUT + SENSE SENSE V LOAD R1 VC = 4V 20s/DIV 1970 TA02 SRC IN V EE 10k VC = 2V SNK COMMON R = 1 CS R2 10k 15V 1970 TA01 1970fe 1 For more information www.linear.com/LT1970 ion pplica ions pplica ion uresLT1970 a Te Maxi Mu M r a T p in c F T (Note 1) TOP VIEW Supply Voltage (V to V ) ..................................... 36V CC EE + V 1 20 V EE EE Positive High Current Supply (V ) ................... V to V CC + + V 2 19 V 21 Negative High Current Supply(V ) ....................V to V EE OUT 3 18 TSD + Amplifier Output (OUT) ..................................... V to V + SENSE 4 17 ISNK Current Sense Pins FILTER 5 16 ISRC + + + (SENSE , SENSE , FILTER) ........................... V to V SENSE 6 15 ENABLE Logic Outputs (ISRC, ISNK, TSD) ....... COMMON to V CC V 7 14 COMMON CC Input Voltage (IN, +IN) ............ V 0.3V to V + 36V EE EE IN 8 13 VC SRC Input Current......................................................... 10mA +IN 9 12 VC SNK Current Control Inputs V 10 11 V EE EE (VC , VC ) .............. COMMON to COMMON + 7V SRC SNK FE PACKAGE 20-LEAD PLASTIC TSSOP Enable Logic Input .............................. COMMON to V CC T = 150C, = 40C/W (NOTE 8) JMAX JA COMMON ....................................................... V to V EE CC EXPOSED PAD (PIN 21) IS CONNECTED TO V EE Output Short-Circuit Duration ......................... Indefinite Operating Temperature Range (Note 2)....40C to 85C Specified Temperature Range (Note 3) .... 40C to 85C Maximum Junction Temperature.......................... 150C Storage Temperature Range ...................65C to 150C Lead Temperature (Soldering, 10 sec) .................. 300C o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT1970CFE PBF LT1970CFE TRPBF LT1970CFE 20-Lead Plastic TSSOP 0C to 70C LT1970IFE PBF LT1970IFE TRPBF LT1970IFE 20-Lead Plastic TSSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: