Analog Devices LT3470A

Overview

Topology	Buck Converter
Input voltage	4-40 V
Switching frequency	1200 kHz
Output 1	16 V
IC revision	B

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

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

More information

Products

Order Code	Datasheet	Simulation	Downloads	Status	Product series	L(µH)	I_R(A)	I_SAT(A)	f_res(MHz)	Mount	I_RP,40K(A)	I_SAT,10%(A)	I_SAT,30%(A)	R_{DC max.}(mΩ)
744031100	WE-TPC SMT Tiny Power Inductor, 10 µH, 0.74 A	Simulation	Downloads9 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 KB KIC KiCad_WE-TPC (rev25b).zip \| 3.9 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CAD files ZIP IGS WE-TPC_3816 (rev1).igs \| 1.5 MB STP WE-TPC_3816 (rev1).stp \| 529.2 KB Electric models ZIP PSP PSpice_WE-TPC (rev23a).zip \| 39.9 KB SCS Spectre_WE-TPC (rev24a).mod \| 52.7 KB Download all 9 files as zip archive ZIP	Status Activei\| Production is active. Expected lifetime: >10 years.	Product seriesWE-TPC SMT Tiny Power Inductor	Inductance10 µH	Rated Current0.74 A	Saturation Current0.56 A	Self Resonant Frequency45 MHz	MountSMT	–	–	–	DC Resistance205 mΩ
74477310	WE-PD2 SMT Power Inductor, 10 µH, 1.45 A	Simulation	Downloads9 files EDA models: Components ZIP ALT WE-PD2 (rev25b).IntLib \| 439 KB CDS Cadence_WE-PD2 (rev23a).zip \| 3.2 MB EAG Eagle_WE-PD2 (rev25a).lbr \| 98.8 KB KIC KiCad_WE-PD2 (rev25b).zip \| 1 MB ZUK CadStar_WE-PD2 (rev19b).zip \| 15.1 KB CAD files ZIP IGS WE-PD2_4532 (rev1).igs \| 1.2 MB STP WE-PD2_4532 (rev1).stp \| 439.1 KB Electric models ZIP PSP PSpice_WE-PD2 (rev25a).zip \| 19.1 KB SCS Spectre_WE-PD2 (rev24a).mod \| 22.1 KB Download all 9 files as zip archive ZIP	Status Activei\| Production is active. Expected lifetime: >10 years.	Product seriesWE-PD2 SMT Power Inductor	Inductance10 µH	Rated Current1.45 A	Saturation Current1.74 A	Self Resonant Frequency37 MHz	MountSMT	Performance Rated Current1.8 A	Saturation Current @ 10%1.74 A	Saturation Current @ 30%2 A	DC Resistance182 mΩ
744031150	WE-TPC SMT Tiny Power Inductor, 15 µH, 0.62 A	Simulation	Downloads9 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 KB KIC KiCad_WE-TPC (rev25b).zip \| 3.9 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CAD files ZIP IGS WE-TPC_3816 (rev1).igs \| 1.5 MB STP WE-TPC_3816 (rev1).stp \| 529.2 KB Electric models ZIP PSP PSpice_WE-TPC (rev23a).zip \| 39.9 KB SCS Spectre_WE-TPC (rev24a).mod \| 52.7 KB Download all 9 files as zip archive ZIP	Status Activei\| Production is active. Expected lifetime: >10 years.	Product seriesWE-TPC SMT Tiny Power Inductor	Inductance15 µH	Rated Current0.62 A	Saturation Current0.45 A	Self Resonant Frequency30 MHz	MountSMT	–	–	–	DC Resistance285 mΩ
744773115	WE-PD2 SMT Power Inductor, 15 µH, 1.2 A	Simulation	Downloads9 files EDA models: Components ZIP ALT WE-PD2 (rev25b).IntLib \| 439 KB CDS Cadence_WE-PD2 (rev23a).zip \| 3.2 MB EAG Eagle_WE-PD2 (rev25a).lbr \| 98.8 KB KIC KiCad_WE-PD2 (rev25b).zip \| 1 MB ZUK CadStar_WE-PD2 (rev19b).zip \| 15.1 KB CAD files ZIP IGS WE-PD2_4532 (rev1).igs \| 1.2 MB STP WE-PD2_4532 (rev1).stp \| 439.1 KB Electric models ZIP PSP PSpice_WE-PD2 (rev25a).zip \| 19.1 KB SCS Spectre_WE-PD2 (rev24a).mod \| 22.1 KB Download all 9 files as zip archive ZIP	Status Activei\| Production is active. Expected lifetime: >10 years.	Product seriesWE-PD2 SMT Power Inductor	Inductance15 µH	Rated Current1.2 A	Saturation Current1.46 A	Self Resonant Frequency26 MHz	MountSMT	Performance Rated Current1.35 A	Saturation Current @ 10%1.46 A	Saturation Current @ 30%1.65 A	DC Resistance235 mΩ
744031220	WE-TPC SMT Tiny Power Inductor, 22 µH, 0.51 A	Simulation	Downloads9 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 KB KIC KiCad_WE-TPC (rev25b).zip \| 3.9 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CAD files ZIP IGS WE-TPC_3816 (rev1).igs \| 1.5 MB STP WE-TPC_3816 (rev1).stp \| 529.2 KB Electric models ZIP PSP PSpice_WE-TPC (rev23a).zip \| 39.9 KB SCS Spectre_WE-TPC (rev24a).mod \| 52.7 KB Download all 9 files as zip archive ZIP	Status Activei\| Production is active. Expected lifetime: >10 years.	Product seriesWE-TPC SMT Tiny Power Inductor	Inductance22 µH	Rated Current0.51 A	Saturation Current0.36 A	Self Resonant Frequency26 MHz	MountSMT	–	–	–	DC Resistance450 mΩ
744773122	WE-PD2 SMT Power Inductor, 22 µH, 1 A	Simulation	Downloads9 files EDA models: Components ZIP ALT WE-PD2 (rev25b).IntLib \| 439 KB CDS Cadence_WE-PD2 (rev23a).zip \| 3.2 MB EAG Eagle_WE-PD2 (rev25a).lbr \| 98.8 KB KIC KiCad_WE-PD2 (rev25b).zip \| 1 MB ZUK CadStar_WE-PD2 (rev19b).zip \| 15.1 KB CAD files ZIP IGS WE-PD2_4532 (rev1).igs \| 1.2 MB STP WE-PD2_4532 (rev1).stp \| 439.1 KB Electric models ZIP PSP PSpice_WE-PD2 (rev25a).zip \| 19.1 KB SCS Spectre_WE-PD2 (rev24a).mod \| 22.1 KB Download all 9 files as zip archive ZIP	Status Activei\| Production is active. Expected lifetime: >10 years.	Product seriesWE-PD2 SMT Power Inductor	Inductance22 µH	Rated Current1 A	Saturation Current1.22 A	Self Resonant Frequency20 MHz	MountSMT	Performance Rated Current1.2 A	Saturation Current @ 10%1.22 A	Saturation Current @ 30%1.42 A	DC Resistance370 mΩ
744773133	WE-PD2 SMT Power Inductor, 33 µH, 0.86 A	Simulation	Downloads9 files EDA models: Components ZIP ALT WE-PD2 (rev25b).IntLib \| 439 KB CDS Cadence_WE-PD2 (rev23a).zip \| 3.2 MB EAG Eagle_WE-PD2 (rev25a).lbr \| 98.8 KB KIC KiCad_WE-PD2 (rev25b).zip \| 1 MB ZUK CadStar_WE-PD2 (rev19b).zip \| 15.1 KB CAD files ZIP IGS WE-PD2_4532 (rev1).igs \| 1.2 MB STP WE-PD2_4532 (rev1).stp \| 439.1 KB Electric models ZIP PSP PSpice_WE-PD2 (rev25a).zip \| 19.1 KB SCS Spectre_WE-PD2 (rev24a).mod \| 22.1 KB Download all 9 files as zip archive ZIP	Status Activei\| Production is active. Expected lifetime: >10 years.	Product seriesWE-PD2 SMT Power Inductor	Inductance33 µH	Rated Current0.86 A	Saturation Current0.9 A	Self Resonant Frequency20 MHz	MountSMT	Performance Rated Current1 A	Saturation Current @ 10%1.1 A	Saturation Current @ 30%1.26 A	DC Resistance540 mΩ
744773147	WE-PD2 SMT Power Inductor, 47 µH, 0.68 A	Simulation	Downloads9 files EDA models: Components ZIP ALT WE-PD2 (rev25b).IntLib \| 439 KB CDS Cadence_WE-PD2 (rev23a).zip \| 3.2 MB EAG Eagle_WE-PD2 (rev25a).lbr \| 98.8 KB KIC KiCad_WE-PD2 (rev25b).zip \| 1 MB ZUK CadStar_WE-PD2 (rev19b).zip \| 15.1 KB CAD files ZIP IGS WE-PD2_4532 (rev1).igs \| 1.2 MB STP WE-PD2_4532 (rev1).stp \| 439.1 KB Electric models ZIP PSP PSpice_WE-PD2 (rev25a).zip \| 19.1 KB SCS Spectre_WE-PD2 (rev24a).mod \| 22.1 KB Download all 9 files as zip archive ZIP	Status Activei\| Production is active. Expected lifetime: >10 years.	Product seriesWE-PD2 SMT Power Inductor	Inductance47 µH	Rated Current0.68 A	Saturation Current0.77 A	Self Resonant Frequency17 MHz	MountSMT	Performance Rated Current0.8 A	Saturation Current @ 10%0.85 A	Saturation Current @ 30%0.98 A	DC Resistance844 mΩ

IC manufacturers (103)

Micropower Buck Regulator with Integrated Boost and Catch Diodes