Analog Devices LT3504

Overview

Topology	Buck Converter
Input voltage	3.2-40 V
Switching frequency	350-2200 kHz
Output 1	1 A
IC revision	A

Description

The LT®3504 consists of four 1A output current buck regulators. The LT3504 has a wide operating input range of 3.2V to 40V. An on-chip boost regulator allows each channel to operate up to 100% duty cycle and eliminates the need for four external charge pump circuits. The LT3504is designed to minimize external component count and results in a simple and small application circuit.The LT3504 operates robustly in fault conditions. Cycleby- cycle peak current limit and catch diode current limit sensing protect the part during overload conditions. Thermal shutdown protects the power switches at elevatedtemperatures. Soft-start helps keep the peak inductor current under control during startup.The LT3504 also features output voltage tracking and sequencing, programmable frequency, programmable undervoltage lockout, and a power good pin to indicate when all outputs are in regulation.

Features

Wide Input Range: 3.2V to 40V
Four 1A Outputs
100% Duty Cycle Operation
Resistor-Programmed Constant Frequency
Short-Circuit Robust
Wide SYNC Range: 350kHz to 2.2MHz
Anti-Phase Switching Reduces Ripple
800mV FB Voltage
Independent Run/Soft-Start Pins
Shutdown with UVLO
Internal Compensation
Thermal Shutdown
Tiny 28-Lead (4mm × 5mm) Thermally Enhanced QFN Package

NOTE - see table 2 in page 14 for diffrent inductor values

Typical applications

Distributed Supply Regulation
Industrial Control Supplies
Automotive Battery Regulation
Wall Transformer Regulation

More information

Products

Order Code	Datasheet	Downloads	Status	Product series	L (µH)	I_R (A)	I_SAT (A)	f_res (MHz)	Mount	I_RP,40K (A)	R_{DC max.} (mΩ)	Size	Version
744042001	SPEC	8 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 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 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-TPC SMT Tiny Power Inductor	1	2.7	2.6	177	SMT	–	30	4818	SMT
744778001	SPEC	9 files EDA models: Components ZIP ALT WE-PD (rev22g).IntLib \| 2.8 MB ZUK CadStar_WE-PD (rev20a).zip \| 36.5 KB CDS Cadence_WE-PD (rev23a).zip \| 13.3 MB EAG Eagle_WE-PD (rev23a).lbr \| 296.9 KB CAD files ZIP 3D Download_3D_WE-PD_7332 (rev1).pdf \| 221.3 KB IGS Download_IGS_WE-PD_7332 (rev1).igs \| 2.2 MB STP Download_STP_WE-PD_7332 (rev1).stp \| 463.4 KB Electric models ZIP PSP PSpice_WE-PD (rev24a).zip \| 57.5 KB SCS Spectre_WE-PD (rev24b).mod \| 77.7 KB Download all 9 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD SMT Power Inductor	1	5.37	6.4	115	SMT	8.3	12	7332	Standard
7447789001	SPEC	8 files EDA models: Components ZIP ALT WE-PD (rev22g).IntLib \| 2.8 MB ZUK CadStar_WE-PD (rev20a).zip \| 36.5 KB CDS Cadence_WE-PD (rev23a).zip \| 13.3 MB EAG Eagle_WE-PD (rev23a).lbr \| 296.9 KB CAD files ZIP IGS Download_WE-PD_7732R_IGS (rev1).igs \| 2.4 MB STP Download_WE-PD_7332R_STP (rev1).stp \| 1.4 MB Electric models ZIP PSP PSpice_WE-PD (rev24a).zip \| 57.5 KB SCS Spectre_WE-PD (rev24b).mod \| 77.7 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD SMT Power Inductor	1	–	–	115	SMT	7.9	12	7332	Robust
7440430012	SPEC	8 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 KB CAD files ZIP IGS WE-TPC_4828 (rev1).igs \| 1.5 MB STP WE-TPC_4828 (rev1).stp \| 577.2 KB Electric models ZIP PSP PSpice_WE-TPC (rev23a).zip \| 39.9 KB SCS Spectre_WE-TPC (rev24a).mod \| 52.7 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-TPC SMT Tiny Power Inductor	1.2	3.1	2.8	150	SMT	–	20	4828	–
744774022	SPEC	8 files EDA models: Components ZIP ALT WE-PD2 (rev22d).IntLib \| 439 KB ZUK CadStar_WE-PD2 (rev19b).zip \| 15.1 KB CDS Cadence_WE-PD2 (rev23a).zip \| 3.2 MB EAG Eagle_WE-PD2 (rev23a).lbr \| 98.8 KB CAD files ZIP IGS WE-PD2_5848 (rev1).igs \| 1.6 MB STP WE-PD2_5848 (rev1).stp \| 608.9 KB Electric models ZIP PSP PSpice_WE-PD2 (rev22a).zip \| 20 KB SCS Spectre_WE-PD2 (rev24a).mod \| 22.1 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD2 SMT Power Inductor	2.2	4.6	8.2	54	SMT	–	41	5848	–
744042003	SPEC	8 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 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 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-TPC SMT Tiny Power Inductor	3.3	1.95	1.8	80	SMT	–	65	4818	SMT
744043003	SPEC	8 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 KB CAD files ZIP IGS WE-TPC_4828 (rev1).igs \| 1.5 MB STP WE-TPC_4828 (rev1).stp \| 577.2 KB Electric models ZIP PSP PSpice_WE-TPC (rev23a).zip \| 39.9 KB SCS Spectre_WE-TPC (rev24a).mod \| 52.7 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-TPC SMT Tiny Power Inductor	3.3	2.15	1.8	80	SMT	–	35	4828	–
744778003	SPEC	9 files EDA models: Components ZIP ALT WE-PD (rev22g).IntLib \| 2.8 MB ZUK CadStar_WE-PD (rev20a).zip \| 36.5 KB CDS Cadence_WE-PD (rev23a).zip \| 13.3 MB EAG Eagle_WE-PD (rev23a).lbr \| 296.9 KB CAD files ZIP 3D Download_3D_WE-PD_7332 (rev1).pdf \| 221.3 KB IGS Download_IGS_WE-PD_7332 (rev1).igs \| 2.2 MB STP Download_STP_WE-PD_7332 (rev1).stp \| 463.4 KB Electric models ZIP PSP PSpice_WE-PD (rev24a).zip \| 57.5 KB SCS Spectre_WE-PD (rev24b).mod \| 77.7 KB Download all 9 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD SMT Power Inductor	3.3	3.1	4.1	61	SMT	4.9	32	7332	Standard
744774033	SPEC	8 files EDA models: Components ZIP ALT WE-PD2 (rev22d).IntLib \| 439 KB ZUK CadStar_WE-PD2 (rev19b).zip \| 15.1 KB CDS Cadence_WE-PD2 (rev23a).zip \| 3.2 MB EAG Eagle_WE-PD2 (rev23a).lbr \| 98.8 KB CAD files ZIP IGS WE-PD2_5848 (rev1).igs \| 1.6 MB STP WE-PD2_5848 (rev1).stp \| 608.9 KB Electric models ZIP PSP PSpice_WE-PD2 (rev22a).zip \| 20 KB SCS Spectre_WE-PD2 (rev24a).mod \| 22.1 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD2 SMT Power Inductor	3.3	4	7.5	43	SMT	–	60	5848	–
744042004	SPEC	8 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 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 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-TPC SMT Tiny Power Inductor	4.7	1.72	1.65	70	SMT	–	82	4818	SMT
744043004	SPEC	8 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 KB CAD files ZIP IGS WE-TPC_4828 (rev1).igs \| 1.5 MB STP WE-TPC_4828 (rev1).stp \| 577.2 KB Electric models ZIP PSP PSpice_WE-TPC (rev23a).zip \| 39.9 KB SCS Spectre_WE-TPC (rev24a).mod \| 52.7 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-TPC SMT Tiny Power Inductor	4.7	1.55	1.7	60	SMT	–	70	4828	–
744778004	SPEC	9 files EDA models: Components ZIP ALT WE-PD (rev22g).IntLib \| 2.8 MB ZUK CadStar_WE-PD (rev20a).zip \| 36.5 KB CDS Cadence_WE-PD (rev23a).zip \| 13.3 MB EAG Eagle_WE-PD (rev23a).lbr \| 296.9 KB CAD files ZIP 3D Download_3D_WE-PD_7332 (rev1).pdf \| 221.3 KB IGS Download_IGS_WE-PD_7332 (rev1).igs \| 2.2 MB STP Download_STP_WE-PD_7332 (rev1).stp \| 463.4 KB Electric models ZIP PSP PSpice_WE-PD (rev24a).zip \| 57.5 KB SCS Spectre_WE-PD (rev24b).mod \| 77.7 KB Download all 9 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD SMT Power Inductor	4.7	2.32	4.2	45	SMT	3.65	60	7332	Standard
744774047	SPEC	8 files EDA models: Components ZIP ALT WE-PD2 (rev22d).IntLib \| 439 KB ZUK CadStar_WE-PD2 (rev19b).zip \| 15.1 KB CDS Cadence_WE-PD2 (rev23a).zip \| 3.2 MB EAG Eagle_WE-PD2 (rev23a).lbr \| 98.8 KB CAD files ZIP IGS WE-PD2_5848 (rev1).igs \| 1.6 MB STP WE-PD2_5848 (rev1).stp \| 608.9 KB Electric models ZIP PSP PSpice_WE-PD2 (rev22a).zip \| 20 KB SCS Spectre_WE-PD2 (rev24a).mod \| 22.1 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD2 SMT Power Inductor	4.7	3	5.5	33	SMT	–	71	5848	–
744042006	SPEC	8 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 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 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-TPC SMT Tiny Power Inductor	6.8	1.5	1.25	60	SMT	–	100	4818	SMT
744043006	SPEC	8 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 KB CAD files ZIP IGS WE-TPC_4828 (rev1).igs \| 1.5 MB STP WE-TPC_4828 (rev1).stp \| 577.2 KB Electric models ZIP PSP PSpice_WE-TPC (rev23a).zip \| 39.9 KB SCS Spectre_WE-TPC (rev24a).mod \| 52.7 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-TPC SMT Tiny Power Inductor	6.8	1.3	1.25	57	SMT	–	90	4828	–
7447789006	SPEC	8 files EDA models: Components ZIP ALT WE-PD (rev22g).IntLib \| 2.8 MB ZUK CadStar_WE-PD (rev20a).zip \| 36.5 KB CDS Cadence_WE-PD (rev23a).zip \| 13.3 MB EAG Eagle_WE-PD (rev23a).lbr \| 296.9 KB CAD files ZIP IGS Download_WE-PD_7732R_IGS (rev1).igs \| 2.4 MB STP Download_WE-PD_7332R_STP (rev1).stp \| 1.4 MB Electric models ZIP PSP PSpice_WE-PD (rev24a).zip \| 57.5 KB SCS Spectre_WE-PD (rev24b).mod \| 77.7 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD SMT Power Inductor	6.8	–	–	38	SMT	3.75	44	7332	Robust
744774068	SPEC	8 files EDA models: Components ZIP ALT WE-PD2 (rev22d).IntLib \| 439 KB ZUK CadStar_WE-PD2 (rev19b).zip \| 15.1 KB CDS Cadence_WE-PD2 (rev23a).zip \| 3.2 MB EAG Eagle_WE-PD2 (rev23a).lbr \| 98.8 KB CAD files ZIP IGS WE-PD2_5848 (rev1).igs \| 1.6 MB STP WE-PD2_5848 (rev1).stp \| 608.9 KB Electric models ZIP PSP PSpice_WE-PD2 (rev22a).zip \| 20 KB SCS Spectre_WE-PD2 (rev24a).mod \| 22.1 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD2 SMT Power Inductor	6.8	2.4	5	28	SMT	–	82	5848	–
744042100	SPEC	8 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 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 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-TPC SMT Tiny Power Inductor	10	1.3	1	45	SMT	–	150	4818	SMT
744043100	SPEC	8 files EDA models: Components ZIP ALT WE-TPC (rev23a).IntLib \| 1.5 MB ZUK Download_CadStar_WE-TPC (rev19a).zip \| 47.5 KB CDS Cadence_WE-TPC (rev23a).zip \| 10.8 MB EAG Eagle_WE-TPC (rev23b).lbr \| 219.3 KB CAD files ZIP IGS WE-TPC_4828 (rev1).igs \| 1.5 MB STP WE-TPC_4828 (rev1).stp \| 577.2 KB Electric models ZIP PSP PSpice_WE-TPC (rev23a).zip \| 39.9 KB SCS Spectre_WE-TPC (rev24a).mod \| 52.7 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-TPC SMT Tiny Power Inductor	10	1.19	1	40	SMT	–	110	4828	–
74477810	SPEC	9 files EDA models: Components ZIP ALT WE-PD (rev22g).IntLib \| 2.8 MB ZUK CadStar_WE-PD (rev20a).zip \| 36.5 KB CDS Cadence_WE-PD (rev23a).zip \| 13.3 MB EAG Eagle_WE-PD (rev23a).lbr \| 296.9 KB CAD files ZIP 3D Download_3D_WE-PD_7332 (rev1).pdf \| 221.3 KB IGS Download_IGS_WE-PD_7332 (rev1).igs \| 2.2 MB STP Download_STP_WE-PD_7332 (rev1).stp \| 463.4 KB Electric models ZIP PSP PSpice_WE-PD (rev24a).zip \| 57.5 KB SCS Spectre_WE-PD (rev24b).mod \| 77.7 KB Download all 9 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD SMT Power Inductor	10	1.83	2.2	32	SMT	2.85	72	7332	Standard
74477410	SPEC	8 files EDA models: Components ZIP ALT WE-PD2 (rev22d).IntLib \| 439 KB ZUK CadStar_WE-PD2 (rev19b).zip \| 15.1 KB CDS Cadence_WE-PD2 (rev23a).zip \| 3.2 MB EAG Eagle_WE-PD2 (rev23a).lbr \| 98.8 KB CAD files ZIP IGS WE-PD2_5848 (rev1).igs \| 1.6 MB STP WE-PD2_5848 (rev1).stp \| 608.9 KB Electric models ZIP PSP PSpice_WE-PD2 (rev22a).zip \| 20 KB SCS Spectre_WE-PD2 (rev24a).mod \| 22.1 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD2 SMT Power Inductor	10	2.2	2.5	26	SMT	–	100	5848	–
744774122	SPEC	8 files EDA models: Components ZIP ALT WE-PD2 (rev22d).IntLib \| 439 KB ZUK CadStar_WE-PD2 (rev19b).zip \| 15.1 KB CDS Cadence_WE-PD2 (rev23a).zip \| 3.2 MB EAG Eagle_WE-PD2 (rev23a).lbr \| 98.8 KB CAD files ZIP IGS WE-PD2_5848 (rev1).igs \| 1.6 MB STP WE-PD2_5848 (rev1).stp \| 608.9 KB Electric models ZIP PSP PSpice_WE-PD2 (rev22a).zip \| 20 KB SCS Spectre_WE-PD2 (rev24a).mod \| 22.1 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD2 SMT Power Inductor	22	1.28	1.53	16	SMT	–	180	5848	–
744778127	SPEC	9 files EDA models: Components ZIP ALT WE-PD (rev22g).IntLib \| 2.8 MB ZUK CadStar_WE-PD (rev20a).zip \| 36.5 KB CDS Cadence_WE-PD (rev23a).zip \| 13.3 MB EAG Eagle_WE-PD (rev23a).lbr \| 296.9 KB CAD files ZIP 3D Download_3D_WE-PD_7332 (rev1).pdf \| 221.3 KB IGS Download_IGS_WE-PD_7332 (rev1).igs \| 2.2 MB STP Download_STP_WE-PD_7332 (rev1).stp \| 463.4 KB Electric models ZIP PSP PSpice_WE-PD (rev24a).zip \| 57.5 KB SCS Spectre_WE-PD (rev24b).mod \| 77.7 KB Download all 9 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD SMT Power Inductor	27	1.27	1.3	18	SMT	1.95	240	7332	Standard
7447789127	SPEC	8 files EDA models: Components ZIP ALT WE-PD (rev22g).IntLib \| 2.8 MB ZUK CadStar_WE-PD (rev20a).zip \| 36.5 KB CDS Cadence_WE-PD (rev23a).zip \| 13.3 MB EAG Eagle_WE-PD (rev23a).lbr \| 296.9 KB CAD files ZIP IGS Download_WE-PD_7732R_IGS (rev1).igs \| 2.4 MB STP Download_WE-PD_7332R_STP (rev1).stp \| 1.4 MB Electric models ZIP PSP PSpice_WE-PD (rev24a).zip \| 57.5 KB SCS Spectre_WE-PD (rev24b).mod \| 77.7 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-PD SMT Power Inductor	27	–	–	18	SMT	2	210	7332	Robust

	Order Code	Datasheet	Simulation
	744042001	SPEC
	744778001	SPEC
	7447789001	SPEC
	7440430012	SPEC
	744774022	SPEC
	744042003	SPEC
	744043003	SPEC
	744778003	SPEC
	744774033	SPEC
	744042004	SPEC
	744043004	SPEC
	744778004	SPEC
	744774047	SPEC
	744042006	SPEC
	744043006	SPEC
	7447789006	SPEC
	744774068	SPEC
	744042100	SPEC
	744043100	SPEC
	74477810	SPEC
	74477410	SPEC
	744774122	SPEC
	744778127	SPEC
	7447789127	SPEC

Samples

	Order Code	Datasheet	Simulation	Downloads	Status	Product series	L (µH)	I_R (A)	I_SAT (A)	f_res (MHz)	Mount	I_RP,40K (A)	R_{DC max.} (mΩ)	Size	Version	Samples

IC manufacturers (99)

Quad 40V/1A Step-Down Switching Regulator with 100% Duty Cycle Operation