LT3091

RECOMMENDED FOR NEW DESIGNS

–36V, 1.5A Negative Linear Regulator with Programmable Current Limit

Data Sheet Product Selection Table
Part Models
28
1ku List Price
Starting From $3.45
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Part Details

  • Output Current: 1.5A
  • Single Resistor Sets Output Voltage
  • 50μA SET Pin Current: ±1% Initial Accuracy
  • Programmable Current Limit
  • Positive or Negative Output Current Monitor
  • Parallelable for Higher Current and Heat Spreading
  • Low Dropout Voltage: 300mV
  • Low Output Noise: 18μVRMS (10Hz to 100kHz)
  • Configurable as a 3-Terminal Floating Regulator
  • Wide Input Voltage Range: –1.5V to –36V
  • Rail-to-Rail Output Voltage Range: 0V to –32V
  • Positive/Negative Shutdown Logic or UVLO
  • Programmable Cable Drop Compensation
  • Load Regulation: 1.2mV (1mA to 1.5A)
  • Stable with 10μF Minimum Output Capacitor
  • Stable with Ceramic or Tantalum Capacitors
  • Thermally Enhanced 14-Lead 4mm × 3mm DFN, 16-Lead TSSOP, 7-Lead TO-220 and DD Packages
LT3091
–36V, 1.5A Negative Linear Regulator with Programmable Current Limit
Output Noise: 10Hz to 100kHz Product Package 1 Product Package 2 Product Package 3 Product Package 4
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
Negative Linear Regulators (LDO) 1
LT3015 Series
1.5A, Low Noise, Negative Linear Regulator with Precision Current Limit
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT3091
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LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC2276A

LT3091EDE Demo Board | Negative LDO with Programmable Current Limit, –1.5V ≤ VIN ≤ –36V, VOUT = –1.25V/–2.5V/–5V/–12V/–15V @ 1.5A

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Product Details

Demonstration circuit DC2276A is a 1.5A low dropout negative linear regulator featuring the LT3091. This device is designed for applications requiring a negative output voltage, output adjustability from –32V down to 0V, and low dropout voltage. The input voltage range is –1.5V to –36V and the output voltage is jumper selectable and can be set to –1.25V, –2.5V, –5V, –12V or –15V.


The LT3091 features fast transient response, high PSRR and output noise as low as 18µVRMS. A single resistor adjusts the LT3091’s precision programmable current limit. The LT3091’s positive or negative current monitor either sources a current (0.25mA/A) or sinks a current (0.5mA/A) proportional to output current.
DC2276A
LT3091EDE Demo Board | Negative LDO with Programmable Current Limit, –1.5V ≤ VIN ≤ –36V, VOUT = –1.25V/–2.5V/–5V/–12V/–15V @ 1.5A
DC2276A Demo Board DC2276A Demo Board DC2276A Demo Board DC2276A Demo Board DC2276A - Schematic

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Two stage +/-15V supply with LT4320 bridges
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