LT3494

PRODUCTION

Micropower Low Noise Boost Converters with Output Disconnect

Data Sheet Product Selection Table
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Overview

  • Low Quiescent Current
    • 65µA in Active Mode
    • 1µA in Shutdown Mode
  • Switching Frequency is Non-Audible Over Entire Load Range
  • Integrated Power NPN:
    • 350mA Current Limit (LT3494A)
    • 180mA Current Limit (LT3494)
  • Integrated Schottky Diode
  • Integrated Output Disconnect
  • Integrated Output Dimming
  • Wide Input Range: 2.3V to 16V
  • Wide Output Range: Up to 40V
  • Tiny 8-Lead 3mm × 2mm DFN Package

The LT3494/LT3494A are low noise boost converters with integrated power switch, Schottky diode and output disconnect circuitry. The parts use a novel* control technique resulting in low output voltage ripple as well as high efficiency over a wide load current range. This technique guarantees that the switching frequency stays above the audio band for the entire load range. The parts feature a high performance NPN power switch with a 350mA and 180mA current limit for the LT3494A and LT3494 respectively. The quiescent current is a low 65µA, which is further reduced to less than 1µA in shutdown. The internal disconnect circuitry allows the output voltage to be isolated from the input during shutdown. An auxiliary reference input (CTRL pin) overrides the internal 1.225V feedback reference with any lower value allowing full control of the output voltage during operation. The LT3494/LT3494A are available in a tiny 8-lead 3mm × 2mm DFN package.

Applications

  • OLED Power
  • Low Noise Power
  • MP3 Players
LT3494
Micropower Low Noise Boost Converters with Output Disconnect
OLED Power Supply from One Li-Ion Cell Output Voltage Ripple vs Load Current Product Package 1 Efficiency and Power Loss vs Load Current
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 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
Protection Switches & Controllers 1
LTC4365
RECOMMENDED FOR NEW DESIGNS Overvoltage, Undervoltage and Reverse Supply Protection Controller
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT3494
  • LT3494A
LTspice

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
DC1024A-A

LT3494EDDB Demo Board | 3V-4.2VIN, 15VOUT @ 32mA

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Product Details

Demonstration circuits 1024A-A and 1024A-B are Micropower Low Noise Boost Converters With Output Disconnect featuring the LT3494 and LT3494A respectively. The demo circuits demonstrate small size and low component count in Boost configuration. Both demo versions are designed to convert a 3V-4.2V source to 15V. The only difference is in the load capability. The 1024A–A supplies 17mA at 3VIN while the 1024A–B supplies 27mA, also at 3VIN. The LT3494 features integrated Schottky diode, output disconnect function, dimming control, output sense resistor and non-audible switching frequency over the entire load range.

eval board
schematic 2
DC1024A-B

LT3494AEDDB Demo Board | 3V-4.2VIN, 15VOUT @ 44mA

Buy Now View Details

Product Details

Demonstration circuits 1024A-A and 1024A-B are Micropower Low Noise Boost Converters With Output Disconnect featuring the LT3494 and LT3494A respectively. The demo circuits demonstrate small size and low component count in Boost configuration. Both demo versions are designed to convert a 3V-4.2V source to 15V. The only difference is in the load capability. The 1024A–A supplies 17mA at 3VIN while the 1024A–B supplies 27mA, also at 3VIN. The LT3494 features integrated Schottky diode, output disconnect function, dimming control, output sense resistor and non-audible switching frequency over the entire load range.
DC1024A-A
LT3494EDDB Demo Board | 3V-4.2VIN, 15VOUT @ 32mA
DC1024A-A - Schematic
DC1024A-B
LT3494AEDDB Demo Board | 3V-4.2VIN, 15VOUT @ 44mA
DC1024A-A - Schematic

Reference Designs

Condition-Based Monitoring Signal Chain for an IEPE Piezoelectric Vibration Sensor
Condition-Based Monitoring Signal Chain for an IEPE Piezoelectric Vibration Sensor
EVAL-CN0540 24-Bit Data Acquisition System for IEPE Sensors
EVAL-CN0540 24-Bit Data Acquisition System for IEPE Sensors - Top View
EVAL-CN0540 24-Bit Data Acquisition System for IEPE Sensors - Bottom View
CN0540 Circuits from the lab

24-Bit Data Acquisition System for IEPE Sensors

View Detailed Reference Design

Features and Benefits

  • IEPE compatible data acquisition system
  • Piezo and MEMs sensors
  • 54 kHz analog input bandwidth
  • Arduino form factor compatible

Part Used

Resources

Design & Integration Tools

Videos

  • lazy blur
    VIDEO · 2022-09-21 01:06
    Easily Connect Sensors with ADI's Robust Industrial Signal Chains
  • lazy blur
    VIDEO · 2021-01-29 02:43
    CN0549 - CbM Development Platform
CN0540
24-Bit Data Acquisition System for IEPE Sensors
Condition-Based Monitoring Signal Chain for an IEPE Piezoelectric Vibration Sensor
EVAL-CN0540 24-Bit Data Acquisition System for IEPE Sensors
EVAL-CN0540 24-Bit Data Acquisition System for IEPE Sensors - Top View
EVAL-CN0540 24-Bit Data Acquisition System for IEPE Sensors - Bottom View

Latest Discussions

1 Years Ago
Wrong Vout/Vfb
1 Years Ago
Output Voltage 13% in error
1 Years Ago
VRef = 1.4V
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