LT3015 Series

RECOMMENDED FOR NEW DESIGNS

1.5A, Low Noise, Negative Linear Regulator with Precision Current Limit

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Overview

  • Output Current: 1.5A
  • Dropout Voltage: 310mV
  • Precision Current Limit with Foldback
  • Low Output Noise: 60μVRMS (10Hz to 100kHz)
  • Low Quiescent Current: 1.1mA
  • Precision Positive or Negative Shutdown Logic
  • Fast Transient Response
  • Wide Input Voltage Range: –1.8V to –30V
  • Adjustable Output Voltage Range: –1.22V to –29.3V
  • Fixed Output Voltages: –2.5V, –3V, –3.3V, –5V, –12V, –15V
  • Controlled Quiescent Current in Dropout
  • <1μA Quiescent Current in Shutdown
  • Stable with 10μF Output Capacitor
  • Stable with Ceramic, Tantalum or Aluminum Capacitors
  • Thermal Limit with Hysteresis
  • Reverse Output Protection
  • 5-Lead TO-220 and DD-Pak, Thermally Enhanced 12-Lead MSOP and 8-Lead 3mm × 3mm × 0.75mm DFN Packages

The LT3015 series are low noise, low dropout, negative linear regulators with fast transient response. The devices supply up to 1.5A of output current at a typical dropout voltage of 310mV. Operating quiescent current is typically 1.1mA and drops to <1μA in shutdown. Quiescent current is also well controlled in dropout. In addition to fast transient response, the LT3015 series exhibit very low output noise, making them ideal for noise sensitive applications.

The LT3015 regulators are stable with a minimum 10μF output capacitor. Moreover, the regulator can use small ceramic capacitors without the necessary addition of ESR as is common with other regulators. Internal protection circuitry includes reverse output protection, precision current limit with foldback and thermal limit with hysteresis.

The LT3015 regulators are available in fixed output voltages of –2.5V, –3V, –3.3V, –5V, –12V and –15V and as an adjustable device with a –1.22V reference voltage. Packages include the 5-lead TO-220 and DD-Pak, a thermally enhanced 12-lead MSOP and the low profile (0.75 mm) 8-lead 3mm × 3mm DFN.

Applications

  • Post-Regulator for Switching Supplies
  • Negative Logic Supplies
  • Low Noise Instrumentation
  • Industrial Supplies
  • Negative Complement to the LT1963A
LT3015 Series
1.5A, Low Noise, Negative Linear Regulator with Precision Current Limit
–5V, –1.5A, Low Noise Regulator Dropout Voltage 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

Design Note 1

Data Sheet

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

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LDO Linear Regulators 1
LT3090
RECOMMENDED FOR NEW DESIGNS –36V, 600mA Negative Linear Regulator with Programmable Current Limit
Protection Switches & Controllers 1
LTC4261
PRODUCTION Negative Voltage Hot Swap Controllers with ADC and I²C Monitoring
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3015
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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

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schematic 1
schematic 2
schematic 3
schematic 4
DC1728A

LT3015 Demo Board | Low Noise, Negative Linear Regulator, Precision Current Limit, –1.8V ≤ VIN ≤ –30V, VOUT = –1.22/–2.5/–5/–12/–15V @ 1.5A

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Product Details

Demonstration circuit 1728A is an adjustable 1.5A negative linear regulator featuring the LT3015. This device supplies up to 1.5A of output current at a typical dropout voltage of 300mV. Operating quiescent current is typically 1.1mA and drops to < 1μA in shutdown. Quiescent current is also well controlled in dropout. In addition to fast transient response, the LT3015 exhibits very low output noise, making it ideal for noise-sensitive applications. A key feature of the LT3015 is the capability to supply a wide output voltage range. The DC1728A can be set to –1.22V, –2.5V, –5.0V, –12.0V, –15.0V, as well as a user selectable value.
DC1728A
LT3015 Demo Board | Low Noise, Negative Linear Regulator, Precision Current Limit, –1.8V ≤ VIN ≤ –30V, VOUT = –1.22/–2.5/–5/–12/–15V @ 1.5A
DC1728A Evaluation Board DC1728A Evaluation Board - Top View DC1728A Evaluation Board - Bottom View DC1728A - Schematic

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