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ADI Power by Linear LT3470A

Micropower Buck Regulator with Integrated Boost and Catch Diodes

Overview

TopologyBuck Converter
Input voltage4-40 V
Switching frequency1200 kHz
Output 116 V
IC revisionB

Description

The LT®3470A is a micropower step-down DC/DC converter that integrates a 440mA power switch, catch diode and boost diode into low profile 2mm × 3mm DFN package. The LT3470A 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 250mA. With its wide input range of 4V to 40V, the LT3470A 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 35μA 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 currentlimiting and hysteretic control protects the LT3470A and external components against shorted outputs, even at 40V input. The LT3470A has higher output current and improved start-up and dropout performance compared to the LT3470.

Features

  • Low Quiescent Current: 35μA at 12VIN to 3.3VOUT
  • Integrated Boost and Catch Diodes
  • Input Range: 4V to 40V
  • 3.3V at 250mA from 4V to 40V Input
  • 5V at 250mA from 5.7V to 40V Input
  • Low Output Ripple: <10mV
  • <1μA in Shutdown Mode
  • Output Voltage: 1.25V to 16V
  • 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) 2mm × 3mm Thermally
  • Enhanced 8-Lead DFN Package

REMARKS:-REFERTable2.Inductor Vendors, page no.10

Typical applications

  • Automotive Battery Regulation
  • Industrial Supplies
  • Power for Portable Products
  • Distributed Supply Regulation
  • Wall Transformer Regulation

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
fres
(MHz)
MountRDC max.
(mΩ)
Samples
744031100
STE ALT EAG CAD LTS PSP SPE IGS CADWE-TPC SMT Tiny Power Inductor 10 0.74 0.56 185 45 SMT 205
74477310
STE ALT EAG CAD LTS PSP SPE IGS CADWE-PD2 SMT Power Inductor 10 1.45 1.74 118 37 SMT 182
744031150
STE ALT EAG CAD LTS PSP SPE IGS CADWE-TPC SMT Tiny Power Inductor 15 0.62 0.45 255 30 SMT 285
744773115
STE ALT EAG CAD LTS PSP SPE IGS CADWE-PD2 SMT Power Inductor 15 1.2 1.46 204 26 SMT 235
744031220
STE ALT EAG CAD LTS PSP SPE IGS CADWE-TPC SMT Tiny Power Inductor 22 0.51 0.36 410 26 SMT 450
744773122
STE ALT EAG CAD LTS PSP SPE IGS CADWE-PD2 SMT Power Inductor 22 1 1.22 261 20 SMT 370
744773133
STE ALT EAG CAD LTS PSP SPE IGS CADWE-PD2 SMT Power Inductor 33 0.86 0.9 370 20 SMT 540
744773147
STE ALT EAG CAD LTS PSP SPE IGS CADWE-PD2 SMT Power Inductor 47 0.68 0.77 523 17 SMT 844
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
fres
(MHz)
MountRDC max.
(mΩ)
Samples