Analog Devices LT3686

Overview

Topology	Buck Converter
Input voltage	3.6-37 V
Switching frequency	300-2500 kHz
Output 1	1.2 A
IC revision	C

Description

The LT®3686 is a current mode PWM step-down DC/DC converter with an internal 1.2A power switch, packaged in 10-lead 3mm × 3mm DFN. The wide input range of 3.6V to 37V makes the LT3686 suitable for regulating power from a wide variety of sources, including 24V industrial supplies and automotive batteries. Its high maximum frequency allows the use of tiny inductors and capacitors, resulting in a very small solution. Operating frequency above the AM band avoids interfering with radio reception, making the LT3686 particularly suitable for automotive applications.

Cycle-by-cycle current limit and DA current sense provide protection against fault conditions. Soft-start and frequency foldback eliminate input current surge during start-up. An optional internal regulated active load at the output via the BD pin keeps the LT3686 at full switching frequency at light loads, resulting in low, predictable output ripple above the audio and AM bands. Internal compensation and an internal boost diode reduce external component count.

Features

Wide Input Range:Operation from 3.6V to 37VOvervoltage Lockout Protects Circuit Through 55V Transients
Low Minimum On-Time:Converts 16VIN to 3.3VOUT at 2MHz
1.2A Output Current
Adjustable Frequency: 300kHz to 2.5MHz
Constant Switching Frequency at Light Loads
Tracking and Soft-Start
Precision UVLO
Short-Circuit Robust
IQ in Shutdown <1μA
Internally Compensated
10-Lead 3mm × 3mm DFN Package

Remarks

Inductor Value Are Given in Page no-13

Typical applications

Battery-Powered Equipment
Distributed Supply Regulation
Automotive Systems
Wall Transformer Regulation

More information

Products

Order Code	Datasheet	Simulation	Downloads	Status	Product series	L(µH)	I_R(A)	I_SAT(A)	f_res(MHz)	Mount	SamplesAvailability & Sample
744042001	SPECWE-TPC SMT Tiny Power Inductor, 1 µH, 2.7 A	Simulation	Availability –	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 (rev26b).zip \| 1.1 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CAD files ZIP IGS WE-TPC_4818 (rev1).igs \| 1.3 MB STP WE-TPC_4818 (rev1).stp \| 458 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	Inductance1 µH	Rated Current2.7 A	Saturation Current2.6 A	Self Resonant Frequency177 MHz	MountSMT	–Check availability
7440420018	SPECWE-TPC SMT Tiny Power Inductor, 1.8 µH, 2.35 A	Simulation	Availability –	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 (rev26b).zip \| 1.1 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CAD files ZIP IGS WE-TPC_4818 (rev1).igs \| 1.3 MB STP WE-TPC_4818 (rev1).stp \| 458 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	Inductance1.8 µH	Rated Current2.35 A	Saturation Current2.4 A	Self Resonant Frequency100 MHz	MountSMT	–Check availability
7440420027	SPECWE-TPC SMT Tiny Power Inductor, 2.7 µH, 2.03 A	Simulation	Availability –	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 (rev26b).zip \| 1.1 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CAD files ZIP IGS WE-TPC_4818 (rev1).igs \| 1.3 MB STP WE-TPC_4818 (rev1).stp \| 458 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	Inductance2.7 µH	Rated Current2.03 A	Saturation Current2.2 A	Self Resonant Frequency90 MHz	MountSMT	–Check availability
7440420039	SPECWE-TPC SMT Tiny Power Inductor, 3.9 µH, 1.82 A	Simulation	Availability –	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 (rev26b).zip \| 1.1 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CAD files ZIP IGS WE-TPC_4818 (rev1).igs \| 1.3 MB STP WE-TPC_4818 (rev1).stp \| 458 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	Inductance3.9 µH	Rated Current1.82 A	Saturation Current1.7 A	Self Resonant Frequency70 MHz	MountSMT	–Check availability
744042004	SPECWE-TPC SMT Tiny Power Inductor, 4.7 µH, 1.72 A	Simulation	Availability –	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 (rev26b).zip \| 1.1 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CAD files ZIP IGS WE-TPC_4818 (rev1).igs \| 1.3 MB STP WE-TPC_4818 (rev1).stp \| 458 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	Inductance4.7 µH	Rated Current1.72 A	Saturation Current1.65 A	Self Resonant Frequency70 MHz	MountSMT	–Check availability
744042005	SPECWE-TPC SMT Tiny Power Inductor, 5.6 µH, 1.64 A	Simulation	Availability –	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 (rev26b).zip \| 1.1 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CAD files ZIP IGS WE-TPC_4818 (rev1).igs \| 1.3 MB STP WE-TPC_4818 (rev1).stp \| 458 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	Inductance5.6 µH	Rated Current1.64 A	Saturation Current1.35 A	Self Resonant Frequency55 MHz	MountSMT	–Check availability
744042006	SPECWE-TPC SMT Tiny Power Inductor, 6.8 µH, 1.5 A	Simulation	Availability –	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 (rev26b).zip \| 1.1 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CAD files ZIP IGS WE-TPC_4818 (rev1).igs \| 1.3 MB STP WE-TPC_4818 (rev1).stp \| 458 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	Inductance6.8 µH	Rated Current1.5 A	Saturation Current1.25 A	Self Resonant Frequency60 MHz	MountSMT	–Check availability
744042008	SPECWE-TPC SMT Tiny Power Inductor, 8.2 µH, 1.4 A	Simulation	Availability –	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 (rev26b).zip \| 1.1 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CAD files ZIP IGS WE-TPC_4818 (rev1).igs \| 1.3 MB STP WE-TPC_4818 (rev1).stp \| 458 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	Inductance8.2 µH	Rated Current1.4 A	Saturation Current1.1 A	Self Resonant Frequency40 MHz	MountSMT	–Check availability
744042100	SPECWE-TPC SMT Tiny Power Inductor, 10 µH, 1.3 A	Simulation	Availability –	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 (rev26b).zip \| 1.1 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CAD files ZIP IGS WE-TPC_4818 (rev1).igs \| 1.3 MB STP WE-TPC_4818 (rev1).stp \| 458 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 Current1.3 A	Saturation Current1 A	Self Resonant Frequency45 MHz	MountSMT	–Check availability

IC manufacturers (103)

37V/1.2A Step-Down Regulator in 3mm × 3mm DFN