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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 | Simulation | Downloads | Status | Product series | L(µH) | IR(A) | ISAT(A) | fres(MHz) | Mount | IRP,40K(A) | RDC max.(mΩ) | Size | Version | ISAT,10%(A) | ISAT,30%(A) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-TPC SMT Tiny Power Inductor, 1 µH, 2.7 A | 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 | – | DC Resistance30 mΩ | Size4818 | VersionSMT | – | – | ||||
 | WE-PD SMT Power Inductor, 1 µH, 5.37 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance1 µH | Rated Current5.37 A | Saturation Current6.4 A | Self Resonant Frequency115 MHz | MountSMT | Performance Rated Current8.3 A | DC Resistance12 mΩ | Size7332 | VersionStandard | Saturation Current @ 10%6.4 A | Saturation Current @ 30%8 A | ||||
| WE-PD SMT Power Inductor, 1 µH, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance1 µH | – | – | Self Resonant Frequency115 MHz | MountSMT | Performance Rated Current7.9 A | DC Resistance12 mΩ | Size7332 | VersionRobust | Saturation Current @ 10%6.4 A | Saturation Current @ 30%8 A | ||||
 | WE-TPC SMT Tiny Power Inductor, 1.2 µH, 3.1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance1.2 µH | Rated Current3.1 A | Saturation Current2.8 A | Self Resonant Frequency150 MHz | MountSMT | – | DC Resistance20 mΩ | Size4828 | – | – | – | ||||
 | WE-PD2 SMT Power Inductor, 2.2 µH, 4.6 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD2 SMT Power Inductor | Inductance2.2 µH | Rated Current4.6 A | Saturation Current8.2 A | Self Resonant Frequency54 MHz | MountSMT | – | DC Resistance41 mΩ | Size5848 | – | – | – | ||||
| WE-TPC SMT Tiny Power Inductor, 3.3 µH, 1.95 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance3.3 µH | Rated Current1.95 A | Saturation Current1.8 A | Self Resonant Frequency80 MHz | MountSMT | – | DC Resistance65 mΩ | Size4818 | VersionSMT | – | – | ||||
| WE-TPC SMT Tiny Power Inductor, 3.3 µH, 2.15 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance3.3 µH | Rated Current2.15 A | Saturation Current1.8 A | Self Resonant Frequency80 MHz | MountSMT | – | DC Resistance35 mΩ | Size4828 | – | – | – | ||||
| WE-PD SMT Power Inductor, 3.3 µH, 3.1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance3.3 µH | Rated Current3.1 A | Saturation Current4.1 A | Self Resonant Frequency61 MHz | MountSMT | Performance Rated Current4.9 A | DC Resistance32 mΩ | Size7332 | VersionStandard | Saturation Current @ 10%4.1 A | Saturation Current @ 30%5.1 A | ||||
| WE-PD2 SMT Power Inductor, 3.3 µH, 4 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD2 SMT Power Inductor | Inductance3.3 µH | Rated Current4 A | Saturation Current7.5 A | Self Resonant Frequency43 MHz | MountSMT | – | DC Resistance60 mΩ | Size5848 | – | – | – | ||||
| WE-TPC SMT Tiny Power Inductor, 4.7 µH, 1.72 A | 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 | – | DC Resistance82 mΩ | Size4818 | VersionSMT | – | – | ||||
| WE-TPC SMT Tiny Power Inductor, 4.7 µH, 1.55 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance4.7 µH | Rated Current1.55 A | Saturation Current1.7 A | Self Resonant Frequency60 MHz | MountSMT | – | DC Resistance70 mΩ | Size4828 | – | – | – | ||||
| WE-PD SMT Power Inductor, 4.7 µH, 2.32 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance4.7 µH | Rated Current2.32 A | Saturation Current4.2 A | Self Resonant Frequency45 MHz | MountSMT | Performance Rated Current3.65 A | DC Resistance60 mΩ | Size7332 | VersionStandard | Saturation Current @ 10%4.2 A | Saturation Current @ 30%5.3 A | ||||
| WE-PD2 SMT Power Inductor, 4.7 µH, 3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD2 SMT Power Inductor | Inductance4.7 µH | Rated Current3 A | Saturation Current5.5 A | Self Resonant Frequency33 MHz | MountSMT | – | DC Resistance71 mΩ | Size5848 | – | – | – | ||||
| WE-TPC SMT Tiny Power Inductor, 6.8 µH, 1.5 A | 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 | – | DC Resistance100 mΩ | Size4818 | VersionSMT | – | – | ||||
| WE-TPC SMT Tiny Power Inductor, 6.8 µH, 1.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance6.8 µH | Rated Current1.3 A | Saturation Current1.25 A | Self Resonant Frequency57 MHz | MountSMT | – | DC Resistance90 mΩ | Size4828 | – | – | – | ||||
| WE-PD SMT Power Inductor, 6.8 µH, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance6.8 µH | – | – | Self Resonant Frequency38 MHz | MountSMT | Performance Rated Current3.75 A | DC Resistance44 mΩ | Size7332 | VersionRobust | Saturation Current @ 10%2.75 A | Saturation Current @ 30%4.3 A | ||||
| WE-PD2 SMT Power Inductor, 6.8 µH, 2.4 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD2 SMT Power Inductor | Inductance6.8 µH | Rated Current2.4 A | Saturation Current5 A | Self Resonant Frequency28 MHz | MountSMT | – | DC Resistance82 mΩ | Size5848 | – | – | – | ||||
| WE-TPC SMT Tiny Power Inductor, 10 µH, 1.3 A | 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 | – | DC Resistance150 mΩ | Size4818 | VersionSMT | – | – | ||||
| WE-TPC SMT Tiny Power Inductor, 10 µH, 1.19 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance10 µH | Rated Current1.19 A | Saturation Current1 A | Self Resonant Frequency40 MHz | MountSMT | – | DC Resistance110 mΩ | Size4828 | – | – | – | ||||
| WE-PD SMT Power Inductor, 10 µH, 1.83 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance10 µH | Rated Current1.83 A | Saturation Current2.2 A | Self Resonant Frequency32 MHz | MountSMT | Performance Rated Current2.85 A | DC Resistance72 mΩ | Size7332 | VersionStandard | Saturation Current @ 10%2.2 A | Saturation Current @ 30%2.75 A | ||||
| WE-PD2 SMT Power Inductor, 10 µH, 2.2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD2 SMT Power Inductor | Inductance10 µH | Rated Current2.2 A | Saturation Current2.5 A | Self Resonant Frequency26 MHz | MountSMT | – | DC Resistance100 mΩ | Size5848 | – | – | – | ||||
| WE-PD2 SMT Power Inductor, 22 µH, 1.28 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD2 SMT Power Inductor | Inductance22 µH | Rated Current1.28 A | Saturation Current1.53 A | Self Resonant Frequency16 MHz | MountSMT | – | DC Resistance180 mΩ | Size5848 | – | – | – | ||||
| WE-PD SMT Power Inductor, 27 µH, 1.27 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance27 µH | Rated Current1.27 A | Saturation Current1.3 A | Self Resonant Frequency18 MHz | MountSMT | Performance Rated Current1.95 A | DC Resistance240 mΩ | Size7332 | VersionStandard | Saturation Current @ 10%1.3 A | Saturation Current @ 30%1.6 A | ||||
| WE-PD SMT Power Inductor, 27 µH, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance27 µH | – | – | Self Resonant Frequency18 MHz | MountSMT | Performance Rated Current2 A | DC Resistance210 mΩ | Size7332 | VersionRobust | Saturation Current @ 10%1.35 A | Saturation Current @ 30%1.6 A |