LT3091 36V, 1.5A Negative Linear Regulator with Programmable Current Limit Fea T Descrip T n Output Current: 1.5A The LT 3091 is a 1.5A, low dropout negative linear n Single Resistor Sets Output Voltage regulator that is easily paralleled to increase output n current or spread heat on surface mounted boards. 50A SET Pin Current: 1% Initial Accuracy n Designed with a precision current reference followed by a Programmable Current Limit n high performance rail-to-rail voltage buffer, this regulator Positive or Negative Output Current Monitor finds use in applications requiring precision output, high n Parallelable for Higher Current and Heat Spreading current with no heat sink, output adjustability to zero and n Low Dropout Voltage: 300mV low dropout voltage. The device can also be configured n Low Output Noise: 18V (10Hz to 100kHz) RMS as a 3-terminal floating regulator. n Configurable as a 3-Terminal Floating Regulator n Wide Input Voltage Range: 1.5V to 36V The LT3091 features fast transient response, high PSRR n Rail-to-Rail Output Voltage Range: 0V to 32V and output noise as low as 18V . The LT3091 generates RMS n Positive/Negative Shutdown Logic or UVLO a wide output voltage range (0V to 32V) while maintain- n ing unity gain operation. This yields virtually constant Programmable Cable Drop Compensation n bandwidth, load regulation, PSRR and noise, independent Load Regulation: 1.2mV (1mA to 1.5A) n of the programmed output voltage. Stable with 10F Minimum Output Capacitor n Stable with Ceramic or Tantalum Capacitors The LT3091 supplies 1.5A at a typical dropout voltage of n Thermally Enhanced 14-Lead 4mm 3mm DFN, 300mV. Operating quiescent current is nominally 1.2mA 16-Lead TSSOP, 7-Lead TO-220 and DD Packages and drops to << 1A in shutdown. A single resistor ad- justs the LT3091s precision programmable current limit. a T The devices positive or negative current monitor either n Post Regulator for Switching Supplies sources a current (0.25mA/A) or sinks a current (0.5mA/A) n Low Noise Instrumentation and RF Supplies proportional to output current. Built-in protection includes n Rugged Industrial Supplies reverse output protection, internal current limit with fold- n back and thermal shutdown with hysteresis. Precision Power Supplies L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patent Pending. Typical a T TO ADC (IMON) 0.1F 49.9k Output Noise: 10Hz to 100kHz 6.65k 10F V OUT SET GND IMONP OUT 2.5V MAX I OUT 1.5A V OUT + 100V/DIV 10F 3091 G39 1ms/DIV IN V IN IMONN 3.3V V : 3.5V IN 3V TO 10V SHDN ILIM 0.1F C : 10F, C : 0.1F OUT SET V : 2.5V OUT 3091 TA01a 5k I : 1.5A L 3091fa 1 For more information www.linear.com/LT3091 LT3091 50A ion pplica ions pplica ion uresLT3091 a Te Maxi Mu M r a T (Note 1) IN Pin Voltage (Note 3) SET Pin Voltage with Respect to GND Pin ...........................0.3V, 40V with Respect to IN Pin (Note 3) .................0.3V, 36V ILIM Pin Voltage with Respect to GND Pin ....................................36V with Respect to IN Pin (Note 3) ................0.3V, 0.7V SET Pin Current (Note 9)........................................5mA IMONP Pin Voltage OUT Pin Voltage with Respect to IN Pin (Note 3) .................0.3V, 40V with Respect to IN Pin (Note 3) .................0.3V, 36V with Respect to GND Pin ............................40V, 20V with Respect to GND Pin ....................................36V with Respect to IMONN Pin ........................40V, 20V Output Short-Circuit Duration .......................... Indefinite IMONN Pin Voltage Operating Junction Temperature Range (Note 2) with Respect to IN Pin (Note 3) .................0.3V, 40V E-, I-Grade ........................................ 40C to 125C with Respect to GND Pin ............................40V, 20V MP-Grade ......................................... 55C to 150C SHDN Pin Voltage H-Grade ............................................ 40C to 150C with Respect to IN Pin (Note 3) .................0.3V, 55V Storage Temperature Range .................. 65C to 150C with Respect to GND Pin ............................40V, 20V Lead Temperature (Soldering, 10 Sec) FE, R, T7 Packages ..........................................300C p in c F T TOP VIEW TOP VIEW IN 1 16 OUT IN 1 14 OUT IN 2 15 OUT IN 2 13 OUT IN 3 14 OUT IN 3 12 OUT IN 4 13 OUT 15 17 IN 4 11 OUT IN IN ILIM 5 12 GND ILIM 5 10 GND IMONP 6 11 SET IMONP 6 9 SET IMONN 7 10 SHDN IMONN 7 8 SHDN NC 8 9 NC DE PACKAGE 14-LEAD (4mm 3mm) PLASTIC DFN FE PACKAGE 16-LEAD PLASTIC TSSOP T = 150C, = 27C/W, = 5.5C/W JMAX JA JC EXPOSED PAD (PIN 15) IS IN, MUST BE SOLDERED TO PCB T = 150C, = 25C/W, = 8C/W JMAX JA JC EXPOSED PAD (PIN 17) IS IN, MUST BE SOLDERED TO PCB FRONT VIEW FRONT VIEW 7 OUT OUT 7 6 GND GND 6 SET 5 SET 5 TAB TAB IN 4 IN 4 IS IN IS IN SHDN 3 SHDN 3 IMONN 2 IMONN 2 ILIM 1 ILIM 1 T7 PACKAGE R PACKAGE 7-LEAD PLASTIC TO-220 7-LEAD PLASTIC DD T = 150C, = 15C/W, = 3C/W T = 150C, = 34C/W, = 3C/W JMAX JA JC JMAX JA JC 3091fa 2 For more information www.linear.com/LT3091 ion igura on ings bsolu