LT3091 –36V, 1.5A Negative Linear Regulator with Programmable Current Limit FeaTuresDescripTion 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 50µA SET Pin Current: ±1% Initial Accuracy current or spread heat on surface mounted boards. n Programmable Current Limit Designed with a precision current reference followed by a n Positive or Negative Output Current Monitor high performance rail-to-rail voltage buffer, this regulator n Parallelable for Higher Current and Heat Spreading finds use in applications requiring precision output, high n current with no heat sink, output adjustability to zero and Low Dropout Voltage: 300mV n low dropout voltage. The device can also be configured Low Output Noise: 18µVRMS (10Hz to 100kHz) n as a 3-terminal floating regulator. 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 18µVRMS. The LT3091 generates n Positive/Negative Shutdown Logic or UVLO a wide output voltage range (0V to –32V) while maintain- n Programmable Cable Drop Compensation ing unity gain operation. This yields virtually constant n Load Regulation: 1.2mV (1mA to 1.5A) bandwidth, load regulation, PSRR and noise, independent n Stable with 10µF Minimum Output Capacitor of the programmed output voltage. 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 << 1µA in shutdown. A single resistor ad- justs the LT3091’s precision programmable current limit. applicaTions The device’s 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 Precision Power Supplies back and thermal shutdown with hysteresis. 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 applicaTion TO ADC (IMON) 0.1µF 49.9k Output Noise: 10Hz to 100kHz 6.65k 10µF VOUT SET GND IMONP LT3091 OUT –2.5V MAX IOUT 1.5A VOUT + 100µV/DIV – 50µA 10µF 1ms/DIV 3091 G39 V IN IN IMONN –3V TO –10V 3.3V VIN: –3.5V SHDN ILIM 0.1µF COUT: 10µF, CSET: 0.1µF VOUT: –2.5V 5k 3091 TA01a IL: 1.5A 3091fa For more information www.linear.com/LT3091 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
