LT3470

PRODUCTION

Micropower Buck Regulator with Integrated Boost and Catch Diodes

Data Sheet (Rev. E) Product Selection Table
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Overview

  • Low Quiescent Current: 26µA at 12VIN to 3.3VOUT
  • Integrated Boost and Catch Diodes
  • Input Range: 4V to 40V
  • Low Output Ripple: <10mV
  • <1µA in Shutdown Mode
  • Output Voltage: 1.25V to 16V
  • 200mA Output Current
  • Hysteretic Mode Control
    • Low Ripple Burst Mode® Operation at Light Loads
    • Continuous Operation at Higher Loads
  • Solution Size as Small as 50mm2
  • Low Profile (0.75mm) 3mm × 2mm Thermally Enhanced 8-Lead DD and 1mm ThinSOT Packages
  • AEC-Q100 Qualified for Automotive Applications

The LT3470 is a micropower step-down DC/DC converter that integrates a 300mA power switch, catch diode and boost diode into low profile 3mm × 2mm DD and ThinSOT™ packages. The LT3470 combines Burst Mode and continuous operation to allow the use of tiny inductor and capacitors while providing a low ripple output to loads of up to 200mA.

With its wide input range of 4V to 40V, the LT3470 can regulate a wide variety of power sources, from 2-cell Li-Ion batteries to unregulated wall transformers and lead-acid batteries. Quiescent current in regulation is just 26µA in a typical application while a zero current shutdown mode disconnects the load from the input source, simplifying power management in battery-powered systems. Fast current limiting and hysteretic control protects the LT3470 and external components against shorted outputs, even at 40V input.

Vin Min Startup Switch Current
LT3470 5.5V 300mA
LT3470A 4V 400mA

Applications

  • Automotive Battery Regulation
  • Power for Portable Products
  • Distributed Supply Regulation
  • Industrial Supplies
  • Wall Transformer Regulation
LT3470
Micropower Buck Regulator with Integrated Boost and Catch Diodes
LT3470 Application Circuit LT3470 Performance Graph LT3470 Pin Configuration LT3470 Pin Configuration
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Design Note 1

Technical Articles 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
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Power System Management (PSM) & Sequencers 1
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Protection Switches & Controllers 2
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3470
  • LT3470A
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
schematic 2
schematic 3
AD-M2KPWR-EBZ

ADALM2000 Power Booster Board

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Features and Benefits

  • ADALM2000 compatible
  • USB Type-C powered
  • Provides two outputs with increased current sourcing capabilities

Product Details

The AD-M2KPWR-EBZ is an ADALM2000 add-on board which increases the output current capability up to 700mA. This board can be also used as a standalone benchtop power supply with positive and negative outputs.

The AD-M2KPWR-EBZ is a USB Type C powered board capable to increase the output current of ADALM2000’s power supplies. 

Inputs:

  1. USB type C:  4 – 18 V (validated with RPI USB-C power supply - not provided in the kit), 20W (power supply permitting)
  2. External (screw terminal connector): 4.5–18V; 20W (power supply permitting)

 

Switching between the inputs is done with a jumper.

Outputs: (2 control modes)

  1. Two variable power supplies that track M2K user supplies:
    1. 0V to 5V (400mA in USB power mode)
    2. –5V to 0V (400mA in USB power mode)
  2. Two variable power supplies, controlled from a potentiometer
    1. 1.5V to 15V (up to 700mA if powered with 18V)
    2. –15V to –1.5V (up to 700mA if powered with 18V)

 

APPLICATIONS

  • General-purpose electronic systems
  • Educational applications
  • Automated test equipment

eval board
schematic 4
DC716B

LT3470ETS8 Demo Board | (TSOT) 7V ≤ VIN ≤ 40V, VOUT = 5V @ 200mA, Integrated Boost & Catch Diodes

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Product Details

Demonstration circuit 716 is a 40V micropower SOT-23 buck regulator featuring the LT3470. The board is optimized for 5V output at up to 200mA load current for a steady state input voltage range of 7V to 40V. The LT3470 hysteretic control scheme allows all of the components to be small, surface mount devices while providing minimum output ripple voltage at all load currents.

eval board
schematic 5
schematic 6
schematic 7
schematic 8
schematic 9
DC1037A

LT3470EDDB Demo Board | (DFN) 5.5V ≤ VIN ≤ 40V, VOUT = 5V @ 200mA, Integrated Boost and Catch Diodes

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Product Details

Demonstration circuit 1037 is a 40V micropower DFN buck regulator featuring the LT3470. The board is optimized for 5V output at up to 200mA load current for a steady state input voltage range of 5.5V to 40V. With its wide input voltage range, high efficiency internal power switch, low dropout operation, hysteretic current-mode, integrated boost and catch diodes and tiny SOT-23 package, the LT3470 is a very versatile and powerful IC for DC/DC converters that require extremely compact space, high efficiency and high input voltage.
AD-M2KPWR-EBZ
ADALM2000 Power Booster Board
AD-M2KPWR-EBZ Evaluation Board AD-M2KPWR-EBZ Evaluation Board - Top View AD-M2KPWR-EBZ Evaluation Board - Bottom View
DC716B
LT3470ETS8 Demo Board | (TSOT) 7V ≤ VIN ≤ 40V, VOUT = 5V @ 200mA, Integrated Boost & Catch Diodes
DC716B - Schematic
DC1037A
LT3470EDDB Demo Board | (DFN) 5.5V ≤ VIN ≤ 40V, VOUT = 5V @ 200mA, Integrated Boost and Catch Diodes
DC1037A Demo Board DC1037A Demo Board DC1037A Demo Board DC1037A Demo Board DC1037A - Schematic

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