Datasheet LT3090 (Analog Devices)

LT3090 –36V, 600mA Negative Linear Regulator with Programmable Current Limit
FeaTures DescripTion
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Output Current: 600mA
The LT®3090 is a 600mA, low dropout negative linear n
Single Resistor Sets Output Voltage
regulator that is easily parallelable 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
Low Dropout Voltage: 300mV
current with no heat sink, output adjustability to zero and n
Low Output Noise: 18µV
low dropout voltage. The device can also be configured
RMS (10Hz to 100kHz)
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Configurable as 3-Terminal Floating Regulator
as a 3-terminal floating regulator. n
Wide Input Voltage Range: –1.5V to –36V
The LT3090 features fast transient response, high PSRR n
Rail-to-Rail Output Voltage Range: 0V to –32V
and output noise as low as 18µVRMS. The LT3090 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 600mA) bandwidth, load regulation, PSRR and noise, regardless n Stable with 4.7µF Minimum Output Capacitor of the programmed output voltage. n Stable with Ceramic or Tantalum Capacitors n The LT3090 supplies 600mA at a typical dropout voltage Thermally Enhanced 12-Lead MSOP and 10-Lead of 300mV. Operating quiescent current is nominally 1mA 0.75mm × 3mm × 3mm DFN Packages and drops to << 1µA in shutdown. A single resistor ad- justs the LT3090’s precision programmable current limit.
applicaTions
The LT3090’s positive or negative current monitor either n Post Regulator for Switching Supplies sources a current (0.5mA/A) or sinks a current (1mA/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 4.7µF 3.32k
Output Noise: 10Hz to 100kHz
VOUT SET GND IMONP LT3090 OUT –2.5V MAX IOUT 600mA + VOUT 100µV/DIV – 4.7µF 50µA 1ms/DIV 3090 TA01b IMONN V IN IN VIN: –3.5V –3V TO –10V 3.3V VOUT: –2V SHDN ILIM COUT: 4.7µF, CSET: 0.1µF 0.1µF IL: 600mA 10k 3090 TA01a 3090fa For more information www.linear.com/LT3090 1