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Overview
| Topology | Buck Converter |
| Input voltage | 3.2-36 V |
| Switching frequency | 220-2400 kHz |
| Output 1 | 1 A |
| Output 2 | 1 A |
| Output 3 | 2 A |
| IC revision | A |
Description
The LT®3514 consists of three buck regulators (2A, 1A, 1A output current). The device has a wide operating input range of 3.2V to 36V. An on-chip boost regulator allows each channel to operate up to 100% duty cycle. The LT3514 is designed to minimize external component count and results in a simple and small application circuit.
The LT3514 operates robustly in fault conditions. Cycleby- cycle peak current limit and catch diode current limit sensing protect the IC during overload conditions. Thermal shutdown protects the power switches at elevated temperatures. Soft-start helps control the peak inductor current during startup.
The LT3514 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.
The LT3514 has one fewer channel (CH2) than the LT3504, and has one channel (CH3) that outputs 2A instead of 1A. The LT3514 in QFN is pin compatible with the LT3504. The LT3504 provides four 1A outputs.
Features
- Wide Input Voltage Range: 3.2V to 36V (40V Transient)
- Three Outputs: 2A, 1A, 1A
- 100% Duty Cycle Operation
- Resistor-Programmed Constant Frequency
- Short-Circuit Robust
- Wide SYNC Range: 350kHz to 2.2MHz
- Anti-Phase Switching Reduces Ripple
- Feedback Voltage: 800mV
- Independent Run/Soft-Start Pins
- Shutdown with UVLO
- Internal Compensation
- Thermal Shutdown
- Tiny 28-Lead (4mm × 5mm) Thermally Enhanced QFN Package
- 24-Lead Exposed Pad TSSOP
Remarks:
- Refer page num 16 for more inductor values.
Typical applications
- Wall Transformer Regulation
- Industrial Control Supplies
- Distributed Supply Regulation
- Automotive Battery 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-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-TPC SMT Tiny Power Inductor, 1.8 µH, 2.35 A | 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 | – | DC Resistance50 mΩ | Size4818 | VersionSMT | – | – | ||||
| WE-TPC SMT Tiny Power Inductor, 2.7 µH, 2.03 A | 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 | – | DC Resistance60 mΩ | Size4818 | VersionSMT | – | – | ||||
| 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, 3.9 µH, 1.82 A | 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 | – | DC Resistance75 mΩ | Size4818 | VersionSMT | – | – | ||||
| 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, 5.6 µH, 1.64 A | 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 | – | DC Resistance90 mΩ | Size4818 | VersionSMT | – | – | ||||
| 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-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, 8.2 µH, 1.4 A | 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 | – | DC Resistance135 mΩ | Size4818 | VersionSMT | – | – | ||||
| WE-TPC SMT Tiny Power Inductor, 8.2 µH, 1.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance8.2 µH | Rated Current1.3 A | Saturation Current1.25 A | Self Resonant Frequency35 MHz | MountSMT | – | DC Resistance90 mΩ | Size4828 | – | – | – | ||||
| 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, 12 µH, 2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD2 SMT Power Inductor | Inductance12 µH | Rated Current2 A | Saturation Current1.94 A | Self Resonant Frequency24 MHz | MountSMT | – | DC Resistance110 mΩ | Size5848 | – | – | – | ||||
| WE-PD SMT Power Inductor, 15 µH, 1.51 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance15 µH | Rated Current1.51 A | Saturation Current1.75 A | Self Resonant Frequency26 MHz | MountSMT | Performance Rated Current2.25 A | DC Resistance130 mΩ | Size7332 | VersionStandard | Saturation Current @ 10%1.75 A | Saturation Current @ 30%2.2 A | ||||
| WE-PD2 SMT Power Inductor, 15 µH, 1.53 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD2 SMT Power Inductor | Inductance15 µH | Rated Current1.53 A | Saturation Current1.9 A | Self Resonant Frequency23 MHz | MountSMT | – | DC Resistance140 mΩ | Size5848 | – | – | – | ||||
| WE-PD2 SMT Power Inductor, 18 µH, 1.45 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD2 SMT Power Inductor | Inductance18 µH | Rated Current1.45 A | Saturation Current1.69 A | Self Resonant Frequency21 MHz | MountSMT | – | DC Resistance150 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 | – | – | – |