LINEAR TECHNOLOGY LT3470 Specifications and User Guide
Summary
The LT3470 is a high-efficiency micropower step-down DC/DC converter designed for demanding battery and industrial power applications. Featuring an integrated boost function, wide input range (4V to 40V), and ultra-low quiescent current, it ensures reliable performance in portable devices and regulated systems. The manual provides detailed specifications on its advanced operational modes, including Burst Mode and protective features, allowing engineers to maintain stable output voltage with minimal size using compact thin packages.
Page 1 Text Content
LT3470
POW ER LOSS (m
Micropower Buck Regulator with Integrated Boost and
Catch Diodes
FEATURES DESCRIPTIO Low Quiescent Current: 26µA at 12VIN to 3.3VOUT The LT®3470 is a micropower step-down DC/DC converter Integrated Boost and Catch Diodes that integrates a 300m A power switch, catch diode Input Range: 4V to 40V and boost diode into low profile 3mm x 2mm DD and Low Output Ripple: <10m V Thin SOTTM packages. The LT3470 combines Burst Mode <1µA in Shutdown Mode and continuous operation to allow the use of tiny inductor Output Voltage: 1.25V to 16V and capacitors while providing a low ripple output to 200m A Output Current loads of up to 200m A. Hysteretic Mode Control
With its wide input range of 4V to 40V, the LT3470 can
– Low Ripple Burst Mode® Operation at Light Loads
regulate a wide variety of power sources, from 2-cell
– Continuous Operation at Higher Loads
Li-Ion batteries to unregulated wall transformers and lead-
Solution Size as Small as 50mm2
acid batteries. Quiescent current in regulation is just 26µA
Low Profile (0.75mm) 3mm x 2mm Thermally
in a typical application while a zero current shutdown
Enhanced 8-Lead DD and 1mm Thin SOT Packages EF FI CI EN CY
mode disconnects the load from the input source, simpli- fying power management in battery-powered systems.
APPLICATIO S
Fast current limiting and hysteretic control protects the
Automotive Battery Regulation LT3470 and external components against shorted out- Power for Portable Products puts, even at 40V input. Distributed Supply Regulation
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Industrial Supplies Burst Mode is a registered trademark of Linear Technology Corporation. Thin SOT is a
trademark of Linear Technology Corporation. All other trademarks are the property of their
Wall Transformer Regulation
respective owners.
TYPICAL APPLICATIO
Efficiency and Power Loss vs Load Current
VIN VIN = 12V
7V TO 40V
VIN BOOST LT3470 33µH
VOUT OFF ON SWSHDN 5V 200m A
FB 22µF2.2µF GND 200k
LOAD CURRENT (m A)
3470 TA02
3470fc
Page Summary Contents For LINEAR TECHNOLOGY LT3470 Specifications and User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 20 |
| File Size | 256.53 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What is the operating input voltage range for the LT3470?
The device accepts an input range from 4V up to 40V.
How does the LT3470 function in low power states?
It features a shutdown mode with deeply reduced current, achieving less than 1µA draw.
What types of electrical sources can this regulator manage?
It regulates a wide variety of power sources, including Li-Ion batteries and unregulated wall transformers.
Is the device protected against overcurrent issues?
Yes, it includes fast current limiting and hysteretic control to protect components from shorted circuits.